| LiNi_(0.5)Mn_(0.5)O_2电极在LiNO_3电解液中的电化学性能及循环衰减机理(英文) |
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| 引用本文： | 王海燕,何菡娜,周南,金冠华,唐有根.LiNi_(0.5)Mn_(0.5)O_2电极在LiNO_3电解液中的电化学性能及循环衰减机理(英文)[J].中国有色金属学会会刊,2014,24(2):415-422. |
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| 作者姓名： | 王海燕 何菡娜 周南 金冠华 唐有根 |
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| 作者单位： | 中南大学 化学化工学院 有色金属资源化学教育部重点实验室,长沙 410083 |
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| 基金项目： | Project （21301193） supported by the National Nature Science Foundation of China，Project （2013M530356） supported by the China Postdoctoral Science Foundation Funded，Project （CUSZC201303） supported by the Scientific Research Foundation of Central South University, and the Open-End Found for Valuable and Precision Instruments of Central South University |
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| 摘 要： | 研究LiNi0.5Mn0.5O2电极在LiNO3水溶液中的电化学行为,同时分析该电极在不同pH值电解液中的循环衰减原因。循环伏安测试显示LiNi0.5Mn0.5O2在浓度为5 mol/L的LiNO3水溶液中具有较好的锂离子脱嵌能力。对比发现,LiNi0.5Mn0.5O2电极在浓度为5 mol/L,pH值为12的LiNO3水溶液中具有最好的循环稳定性能。通过交流阻抗法、X射线衍射分析及电极形貌的对比分析发现:电极在浓度为5 mol/L,pH值为12的LiNO3水溶液中循环时,电极的表面形貌和电极结构都能得到较好的保持,电极的电荷传递阻抗得到明显抑制,因此在该pH值电解液中的循环稳定性最好。
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| 关 键 词： | 锂离子电池 LiNi. Mn. O 循环衰减机制 循环伏安法 LiNO溶液 |
| 收稿时间： | 31 December 2012 |
Electrochemical behavior and cyclic fading mechanism of LiNi0.5Mn0.5O2 electrode in LiNO3 electrolyte |
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| Hai-yan WANG,Han-na HE,Nan ZHOU,Guan-hua JIN,You-gen TANG.Electrochemical behavior and cyclic fading mechanism of LiNi0.5Mn0.5O2 electrode in LiNO3 electrolyte[J].Transactions of Nonferrous Metals Society of China,2014,24(2):415-422. |
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| Authors: | Hai-yan WANG Han-na HE Nan ZHOU Guan-hua JIN You-gen TANG |
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| Affiliation: | (Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China) |
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| Abstract: | Electrochemical behavior of layered LiNi0.5Mn0.5O2 in LiNO3 aqueous solution and its cyclic fading mechanism in electrolytes with different pH values were investigated. CV results show that LiNi0.5Mn0.5O2 has good electrochemical reversible behaviors in 5 mol/L LiNO3 solution. Meanwhile, the electrode in 5 mol/L LiNO3 with pH value of 12 demonstrates the best electrochemical stability. Based on the electrochemical impedance spectroscopy （EIS）, X-ray diffraction （XRD） and scanning electron microscopy （SEM） results, it is proposed that suppressed charge-transfer resistance is the major reason, which is probably ascribed to the more stable electrode surface and less structure change. |
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| Keywords: | lithium ion battery cyclic fading mechanism cyclic voltammetry LiNO3 solution |
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