作者：
DENG Zhao-feng;ZHANG Zhi-an;LAI Yan-qing;LI Jie;LIU Ye-xiang
作者机构：
[DENG Zhao-feng; ZHANG Zhi-an; LAI Yan-qing; LI Jie] School of Metallurgical Science and Engineering, Central South University, Changsha, 410083;[LIU Ye-xiang] School of Metallurgical Science and Engineering, Central South Univ
作者：
Hongquan Gao;Zhi'an Zhang;Yanqing Lai;Li Jie;Yexiang Liu
作者机构：
[Hongquan Gao; Zhi'an Zhang; Yanqing Lai; Li Jie; Yexiang Liu] School of Metallurgical Science and Engineering,Central South University,Changsha 410083,P.R. China
会议名称：
The 60th Annual Meeting of The International Society of Electrochemistry(第60届国际电化学会议)
会议时间：
2009-8-16
会议地点：
北京
会议主办单位：
北京大学
会议论文集名称：
The 60th Annual Meeting of The International Society of Electrochemistry(第60届国际电化学会议)论文集
作者机构：
[Li, Jie; Zhang, Zhijian; Yang, Chao; Tian, Zhongliang; Zhang, Kai; Lai, Yanqing] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.
通讯机构：
Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.
摘要：
The effects of molecular weight and solubility of carboxymethyl cellulose (CMC) on the electrochemical characteristics of zinc plate electrodes and Zn-Ni batteries were investigated with and without ZnO in 6 M KOH solution, respectively. The result of electrochemical impedance spectroscopy (EIS) indicated that as an important additive in zinc paste electrodes, CMCs with M.W.s of 700,000, 250,000, and 90,000 can all suppress the corrosion of zinc. The zinc deposition experiment revealed that the CMCs, especially the soluble M. W. 700,000 CMC, can suppress zinc electrodeposition kinetics and decreases the porosity of zinc deposits. Zn-Ni battery performance tests indicate that a suitable concentration of soluble CMC will decrease charge and discharge polarization and increase discharge capacity. These results indicated that various M.W.s and the solubility of CMC in 6 M KOH showed complex electrochemical effects on zinc electrodes in alkaline solution, and their addition to a zinc paste electrode needs careful consideration. (c) 2017 Elsevier Ltd. All rights reserved.
作者：
Chen, Wei;Lai, Yanqing;Zhang, Zhian*;Gan, Yongqing;Jiang, Shaofeng;Li, Jie
期刊：
JOURNAL OF MATERIALS CHEMISTRY A,2015年3(12):6447-6454 ISSN：2050-7488
通讯作者：
Zhang, Zhian
作者机构：
[Chen, Wei; Jiang, Shaofeng; Gan, Yongqing; Li, Jie; Zhang, Zhian; Lai, Yanqing] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.
通讯机构：
[Zhang, Zhian] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.
摘要：
A composite of beta-FeOOH-carbon aerogels (FCAs) was designed and prepared via a simple hydrothermal method. The samples were characterized by X-ray diffraction, field emission scanning electron microscopy and N-2 adsorption/desorption measurements. It is found that the composite possesses a large pore volume and, especially, has a high proportion of mesopores. The material was studied as an O-2 electrode for non-aqueous lithium-O-2 batteries and the electrochemical performance of the electrode was evaluated by using galvanostatic discharge-charge processes and cyclic voltammetry (CV). The FCAs electrode exhibits excellent performance and delivers a discharge capacity of up to similar to 10 230 mA h g(carbon+catalyst)(-1) at 0.1 mA cm(-2) and a high C-rate performance with a discharge capacity of similar to 6110 mA h g(carbon+catalyst)(-1) at 0.2 mA cm(-2) and similar to 4270 mA h g(carbon+catalyst)(-1) at 0.5 mA cm(-2), it also exhibits a stable discharge voltage plateau at 2.75 V and a charge voltage plateau of similar to 3.75 V, and shows a good cycle performance. The excellent electrochemical performance of the FCAs is attributed to the synergistic effect of the good catalytic activity of beta-FeOOH and the high porosity of the carbon aerogels. These results demonstrate that the carbon aerogels are suitable for the skeleton material to load the catalyst and the FCAs can be an outstanding material for the cathode of Li-O-2 batteries.
作者：
Lai, Yanqing;Ren, Chunyan;Lu, Hai;Zhang, Zhian*;Li, Jie
期刊：
JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2012年159(8):A1267-A1272 ISSN：0013-4651
通讯作者：
Zhang, Zhian
作者机构：
[Li, Jie; Zhang, Zhian; Lai, Yanqing; Ren, Chunyan; Lu, Hai] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Peoples R China.;[Li, Jie; Lai, Yanqing] Minist Educ, Engn Res Ctr Adv Battery Mat, Changsha 410083, Hunan, Peoples R China.
通讯机构：
[Zhang, Zhian] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Peoples R China.
摘要：
Diphenyloctyl phosphate (DPOF) was used as a flame-retardant additive to improve the thermal stability of electrolyte for lithium-ion batteries. Effects of DPOF on the flammability and conductivity of electrolyte were investigated. A series of electrochemical measurements and scanning electron microscopy (SEM) were employed to investigate the compatibility of DPOF with LiNi1/3Co1/3Mn1/3O2 (NCM) and artificial graphite (AG), respectively. The results show that DPOF can effectively reduce the flammability of the electrolytes, corresponding with a small decrease of conductivity. Additionally, DPOF has no distinct effect on SEI film formation of artificial graphite, and the capacity of Li/AG half-cell with 5% DPOF is higher than that of base electrolyte, while the cycling stability of NCM/Li cells becomes worse with the increasing ratio of DPOF. Electrochemical impedance spectroscopy shows that the charge-transfer resistance of NCM/Li cells with DPOF is much larger than that of cells without DPOF in the 50th cycle, while there is no distinct variation on resistances of Li/AG cells with or without DPOF. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.058208jes] All rights reserved.
作者机构：
[Zhang, Hongliang; Xu, Yujie; Wang, Zhigang; Li, Jie; Lai, Yanqing] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Hunan, Peoples R China.
通讯机构：
[Li, Jie] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Hunan, Peoples R China.
摘要：
The melt flow field and magneto-hydrodynamics (MHD) instabilities in aluminum reduction cells strongly affect the current efficiency and cell operation and a great deal of effort has gone into modeling melt flow and MHD instabilities. In this review, the progress of melt flow is presented: the successes and defects of modeling melt flow via k-ɛ model, Navier-Stokes equations due to different driving forces of electromagnetic forces, gas bubbles, and the combined effect of these driving forces are discussed. A new three-dimensional (3-D) multi-phase (electrolyte-aluminum-bubble) model needs to be developed. In MHD instabilities, several different published methods are reviewed such as: two-dimensional/3-D linear model, Kelvin-Helmholtz (K-H) model, linear mode coupling model, nonlinear instabilities and velocity coupling model. The benefits, limitations, and effectiveness of each type of model are considered.
作者机构：
[Liu, Wei; Liu, Yexiang; Li, Jie; Lai, Yanqing] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Peoples R China.;[Li, Jie] Cent S Univ, Sch Met Sci & Engn, S Lushan St, Changsha 410083, Peoples R China.
通讯机构：
[Li, Jie] Cent S Univ, Sch Met Sci & Engn, S Lushan St, Changsha 410083, Peoples R China.
摘要：
This article presents the use of an improved finite-element model to calculate the static electromagnetic field for an aluminum reduction cell. Consisting of three solid cells and their surrounding bus bars, the model can evaluate the non-uniformity of the current distribution in the inside conductors and bus bar system and couple the current into the sequential magnetic analysis through a conversion routine. Voltage potential distribution in the molten aluminum was investigated based on one industrial 320 kA aluminum cell with two designed bus bar arrangements. Characteristics of magnetic components’ distributions were also given.
摘要：
Ni-NiO-NiFe<inf>2</inf>O<inf>4</inf> cermets with different NiO and Ni contents were prepared and their corrosion behaviors in Na<inf>3</inf>AlF <inf>6</inf>-Al<inf>2</inf>O<inf>3</inf> melts were investigated in laboratory electrolysis tests. The solubilities of NiO-NiFe<inf>2</inf>O<inf>4</inf> ceramics with different NiO contents were also determined by an equilibration technique. The electrolysis tests showed that excess NiO was beneficial to the reduction of Fe while had little effect on that of Ni in the bath;the steady-state concentrations of Ni, Fe were below the solubilities of corresponding NiO-NiFe<inf>2</inf>O<inf>4</inf> ceramic matrix. The increase of Ni content in cermets had little influence on the steady-state concentrations of both Ni and Fe, which were also far below their solubilities. Post-electrolysis micro examination of anodes showed that Ni metal may be oxidized first and then transferred to the melts by chemical dissolution. Moreover, the impurity ions transferred directionally and gathered near cathode, forming a concentration gradient;such a gradient was affected by a variety of factors and requires further researches.
作者：
Wang Jiawei*;Lai Yanqing;Tian Zhongliang;Li Jie;Liu Yexiang
作者机构：
[Li Jie; Liu Yexiang; Wang Jiawei; Lai Yanqing; Tian Zhongliang] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Peoples R China.
会议名称：
Light Metals 2008
会议时间：
March 9, 2008 - March 13, 2008
会议地点：
New Orleans, LA, United states
会议主办单位：
(1) School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China; (2) College of Materials Science and Metallurgy Engineering, Guizhou University, Guiyang 550003, China
会议论文集名称：
LIGHT METALS
关键词：
temperature of primary crystallization;Na(3)AlF(6)-K(3)AlF(6)-AlF(3) system;classical thermo-analysis;aluminum electrolysis
摘要：
Methods for testing temperature of primary crystallization in aluminum electrolyte melts were summarized, a classical thermo-analysis method was chosen, an experimental setup was built and its reliability was proven. To get base datum of electrolytes and provide theoretical guidance for low temperature aluminum electrolysis, temperature of primary crystallization in part of system Na<inf>3</inf>AlF<inf>6</inf>-K<inf>3</inf>AlF<inf>6</inf>-AlF<inf>3</inf> was tested, the ratio of K<inf>3</inf>AlF<inf>6</inf> to K<inf>3</inf>AlF <inf>6</inf>+Na<inf>3</inf>AlF<inf>6</inf> was 0-20wt.%, and AlF<inf>3</inf> would occupy 0-30wt.% of total electrolytes weight. Results showed that, when AlF<inf>3</inf> was below 20wt.%, adding of K<inf>3</inf>AlF<inf>6</inf> decreased temperature of primary crystallization, but when above 20wt.%, the effect of K<inf>3</inf>AlF<inf>6</inf> on it was not obvious. To the samples with ratio of K<inf>3</inf>AlF<inf>6</inf> to K<inf>3</inf>AlF <inf>6</inf>+Na<inf>3</inf>AlF<inf>6</inf> 0, 10, 20, when AlF<inf>3</inf> was below 18wt.%, every adding 1wt.% AlF<inf>3</inf> would decrease approximate 3.49, 2.33 and 1.59°C respectively, but when above 18wt.%, the effect of AlF<inf>3</inf> on it became notable, every adding 1wt.% AlF<inf>3</inf> would all decrease about 10°C.
摘要：
Blends of furan resin and pitch were applied as the binder of TiB <inf>2</inf>-C cathodes. Characteristic properties of both the binder and furan/pitch based TiB<inf>2</inf>-C cathodes were studied. The actual coking value of furan/pitch binder was higher than the theoretical value calculated from the coking values of the two components. There was a synergistic effect between pitch and furan resin. This leads to TiB<inf>2</inf>-C cathode materials with lower open porosity and electrical resistivity and higher bulk density and compressive strength than those of pure pitch based TiB<inf>2</inf>-C cathode materials. In addition, the low-temperature electrolysis expansion of TiB <inf>2</inf>-C samples was tested. Furan/pitch based TiB<inf>2</inf>-C samples showed lower electrolysis expansion than pitch based TiB<inf>2</inf>-C samples (1.68% and 1.87%, respectively). Molecular structure (FTIR) and semicoke morphology (SEM) analysis results indicated that after adding an appropriate amount of furan resin, the pitch binder had improved cohesion and flexibility.
作者机构：
[Liu, Yexiang; Tian, Zhongliang; Wang, Jiawei; Li, Jie; Lai, Yanqing] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Peoples R China.
会议名称：
TMS 2007 Annual Meeting and Exhibition
会议时间：
February 25, 2007 - March 1, 2007
会议地点：
Orlando, FL, United states
会议主办单位：
(1) School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China; (2) College of Materials Science and Metallurgy Engineering, Guizhou University, Guiyang 550003, China
会议论文集名称：
Light Metals
关键词：
NiFe2O4-NiO based cermets;corrosion resistance;low temperature;aluminum electrolysis
摘要：
The melting points of a traditional Na<inf>3</inf>AlF<inf>6</inf>-AlF <inf>3</inf>-Al<inf>2</inf>O<inf>3</inf> high-temperature bath, a type of KF-AlF<inf>3</inf>-Al<inf>2</inf>O<inf>3</inf> low-temperature bath and a type of K<inf>3</inf>AlF<inf>6</inf>-Na<inf>3</inf>AlF<inf>6</inf>-AlF <inf>3</inf>-Al<inf>2</inf>O<inf>3</inf> multiple cryolite low-temperature bath were examined using classical thermo-analysis laboratory scale methods. A nickel ferrite cermet inert anode, with a composition of 5wt.%Cu-9.5wt.%NiO-85.5wt. %NiFe<inf>2</inf>O<inf>4</inf>, was tested in these three different electrolytes under polarization conditions. Postelectrolysis macro- and microscopic examination of the anode shape were undertaken. The Ni, Fe and Cu content in the bath and aluminum were measured, as was the fluctuation of cell voltage. As a result, a promising low-temperature bath system will be chosen for further study.
作者机构：
[Zhang, Gang; Li, Me; Liu, Yexiang; Lai, Yanqing; Zhang, Yong] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Li, Zhiyou] State Key Lab Powder Met, Changsha 410083, Peoples R China.
会议名称：
TMS 2007 Annual Meeting and Exhibition
会议时间：
February 25, 2007 - March 1, 2007
会议地点：
Orlando, FL, United states
会议主办单位：
(1) School of Metallurgical Science and Engineering, Central South University, Changsha, Hunan 410083, China; (2) State Key Laboratory of Powder Metallurgy, Changsha 410083, China
摘要：
Cu/ (10NiO-NiFe<inf>2</inf>O<inf>4</inf>) cermets were fabricated by using cold pressing sintering method. The phase composition and microstructure and effect of metallic content on the relative density and mechanical properties such as bending strength and fracture toughness were studied. The results showed that the cermets were consisted of Cu, NiO and NiFe<inf>2</inf>O<inf>4</inf>. Within the range of metallic content from 0 to 20wt.%, there was a durative increase for the fracture toughness and a break for the relative density and bending strength with the increase of metallic content. A maximal relative density with 95.85% and bending strength with 200.34MPa and fracture toughness with 3.55 MPamiddot;m<sup>1/2</sup> could be achieved at the metallic content of 5wt. %, 15wt. % and 20wt. %, respectively. The ratio of Fe/Ni was about 2.58-2.84 in NiFe<inf>2</inf>O<inf>4</inf>and 0.24-0.29 in NiO.
会议主办单位：
(1) School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China; (2) Yunnan Aluminium Co. Ltd., Kunming, China; (3) Qiya Aluminum (Group) Co, Ltd., Emeishan, China
摘要：
In order to seek an energy-saving way suitable for Chinese large-scale prebaked cells, Central South University, collaborated with Yunnan Aluminum Co. Ltd and Sichuan Qiya Aluminum Group and has put forward a "low-voltage energy-saving aluminum reduction technology". It includes a set of technical measures related to the adjustment of technological parameters and the innovation of cathode structure (e.g. "curved cathode", invented by the collaboration). With the combined use of the measures in test cells, the cell voltage has been reduced to 3.90 similar to 3.96 V while the current efficiency could be raised to or maintained at 93.0 similar to 95.5 % and DC consumption reduced to 12189 similar to 12501 kWh/t-Al. The extending application of the technology to whole potlines is now in process, the preliminary results of which have given us the hope that with more improvement and combined with China's well-designed potlines, this technology can realize the target of reducing DC consumption to below 12000kWh/t-Al and it can also be used for the upgrading of old-type cells to achieve marked energy-saving effects (e.g. reducing to below 12500kWh/t-Al).
摘要：
Pitches were modified by the heat-treated method, and the properties of pitch modified at different treatment temperatures were studied. Furthermore, the effects that modified pitch used as binder on properties of TiB <inf>2</inf>-C composite cathodes were investigated. The results show that the coke yield and the viscosity of modified pitch increase with treatment temperature. When the treatment temperature increases from 220 °C to 420 °C, the viscosity increases from 506 mPa·s to 27500 mPa·s and the coke yield increases from 47.21 % to 69.64 %. The variation of cathode bulk density (Δη<inf>ρ</inf>:(ρ<inf>Baled</inf>- ρ<inf>Green</inf>/ρ<inf>Green</inf>)) increases with the treatment temperature but the electrolysis expansion first decreases and then increase s. When pitches are modified at 340 °C, the electrolysis expansion reaches the minimum and decreases by 14.01 % compared to cathodes of primitive pitch. However, when pitches are modified at 420 °C, it increases by 3.82%.
作者机构：
[Liu, Yexiang; Li, Jie; Tian, Zhongliang; Li, Xinzheng; Lai, Yanqing] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Peoples R China.
会议名称：
TMS 2007 Annual Meeting and Exhibition
会议时间：
February 25, 2007 - March 1, 2007
会议地点：
Orlando, FL, United states
会议主办单位：
(1) School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, China
会议论文集名称：
Light Metals
关键词：
aluminum electrolysis;inert anode;NiFe2O4 based cermet;corrosion resistance
摘要：
Cu/(10NiO-90NiFe<inf>2</inf>O<inf>4</inf>) cermet inert anodes with metal Cu content of 0, 5, 10, 15 and 20% were prepared and their corrosion behavior in Na<inf>3</inf>AlF<inf>6</inf>-Al<inf>2</inf>O<inf>3</inf> melts was investigated in laboratory electrolysis tests. The results indicate that the content of metal Cu in anodes had little effects on the steady-state concentrations of Ni in electrolyte, the concentration of Fe decreases from 304ppm to 206ppm and that of Cu increases from 21ppm to 70ppm with the content of metal Cu increasing from 0 to 20%. Considering the corrosion resistance, among NiFe<inf>2</inf>O<inf>4</inf> based cermet anodes with different content of metal Cu, 5Cu/(10NiO-90NiFe<inf>2</inf>O<inf>4</inf>) cermet behaves best and should be further studied. Post-examination shows that metal Cu at the anode surface is oxidized, which improve its corrosion resistance, and doesn't leach preferentially during electrolysis.
会议名称：
Light Metals 2004 - Proceedings of the Technical Sessions, 133rd Technical TMS Annual Meeting
会议时间：
March 14, 2004 - March 18, 2004
会议地点：
Carlotte, NC, United states
会议主办单位：
(1) Chemistry Department, Guangxi Normal University, Guilin, Guangxi, 5410043, China; (2) Sch. of Metall. Sci. and Engineering, Central South University, Changsha, Hunan, 410083, China; (3) Guangxi Branch Company, Aluminum Corp. of China Limited, Pingguo, Guangxi, 531400, China
会议论文集名称：
LIGHT METALS
关键词：
aluminum electrolysis;TiB(2) cathode coating;ambient temperature cured;industrial application;laboratory test
摘要：
A method curing TiB<sup>2</sup> cathode coating at ambient temperature is put forward to save the heating equipment, which had to be used for previous TiB<inf>2</inf> cathode coatings solidified approximately at 200°C. The ambient temperature curable TiB<inf>2</inf> cathode coating simplifies the preparation process and facilitates the industrial application of TiB <inf>2</inf> cathode coating. Laboratory tests show that the properties of the cathode coating are excellent, the electrical resistivity is 23.8μΩm, the compressive strength is 33.6 MPa, and the sodium expansion of the cathode in aluminium electrolysis cells is reduced by about 50%. The ambient temperature curable TiB<inf>2</inf> cathode coating has successfully been tested in industrial prebake aluminium electrolysis cells. As compared with reference cells, the test cells for the coating have much better current distribution, lower cathodic voltage drop, higher current efficiency, and less sodium-related damage.
摘要：
An improved pyroconductivity test device, consisting of a specially constructed airtight furnace and a potentiostat, was constructed based on the conventional direct current four-electrode technique. Symmetrical current distribution in the specimen was obtained by keeping a fixed pressure and good electrical contact between the specimen and the electrodes at any temperature. The potentiostat was used to supply direct current and continuously monitor the current intensity and voltage drop, which could be adjusted outside the heating furnace to give good contact with the specimen. Test results of graphite specimens showed that the reliability and reproducibility were excellent. The electrical conductivity as a function of temperature for various spinel-containing cermet inert anodes was investigated, spanning the Hall-He´roult cell operating temperature. The factors influencing the electrical behavior were studied, which included the particle size of raw materials, manufacture process, phase composition and morphology etc.