| LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2的低温性能及动力学分析 |
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| 引用本文： | 李光胤,;黄震雷,;张占军,;周恒辉.LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2的低温性能及动力学分析[J].中国科学:化学,2014(7):1167-1174. |
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| 作者姓名： | 李光胤 ;黄震雷 ;张占军 ;周恒辉 |
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| 作者单位： | [1]北京大学化学与分子工程学院,北京100871; [2]中国科学院大学化学与化学工程学院,北京100049 |
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| 基金项目： | 致谢 本工作得到科技部中国-新加坡国际合作项目（2012DFG52130）和北大先行科技产业有限公司资助,特此一并致谢. |
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| 摘 要： | 通过高温烧结制备了锂离子电池正极材料LiNi1/3Co1/3Mn1/3O2,并用XRD、SEM和恒流充放电对材料的结构、形貌和低温电性能进行了表征,通过线性极化、GITT和EIS等手段研究分析了低温下LiNi1/3Co1/3Mn1/3O2性能变差的原因.结果表明,-20℃时,LiNi1/3Co1/3Mn1/3O2材料的0.1、0.2、1和5 C倍率放电比容量依次为25℃时同倍率下放电比容量的83.2%、68.4%、57.2%和34.1%,放电中值电压比25℃时依次降低了0.049、0.125、0.364和0.531 V.低温充放电过程表现出明显的极化现象,其中最显著的极化来自锂离子穿过活性物质/电解液界面过程以及电荷转移过程,而非锂离子在电极材料内部的扩散过程.
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| 关 键 词： | 锂离子电池 低温性能 恒电流间歇滴定法 |
Low temperature performances and kinetic analysis on LiNi1/3Co1/3Mn1/3O2 |
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| Institution: | LI GuangYin, HUANG ZhenLei, ZHANG ZhanJun, ZHOU HengHui(1 College of Chemistry and Molecular Engineering, Peking University, Beijing 100871; 2 College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049) |
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| Abstract: | LiNi1/3Co1/3Mn1/3O2 was prepared by high temperature sintering. The structure, morphology and low temperature performances were characterized by XRD, SEM and charge/discharge test. The reasons of capacity fade at low temperature were analyzed by linear polarization, GITT, and EIS. The results show that, compared with 25 ℃, the capacity of LiNi1/3Co1/3Mn1/3O2 at -20 ℃ delivers 83.2%, 68.4%, 57.2% and 34.1% at 0.1, 0.2, 1 and 5 C, respectively. The discharge mid-voltage reduces 0.049, 0.125, 0.364 and 0.531 V, respectively. It should be noticed that the significant polarization at low temperature charge/discharge process is mainly arised from the process of lithium ions traversing electrode/electrolyte interface and charge transfer, rather than lithium ions diffusion process in electrode material. |
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| Keywords: | Li ion battery low temperature performance GITT |
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