Ni-Mn共掺杂高电压钴酸锂锂离子电池正极材料

引用本文: 胡国荣, 卢苇, 梁龙伟, 曹雁冰, 彭忠东, 杜柯. Ni-Mn共掺杂高电压钴酸锂锂离子电池正极材料[J]. 无机化学学报, 2015, (1): 159-165. doi: 10.11862/CJIC.2015.020 shu

Citation: HU Guo-Rong, LU Wei, LIANG Long-Wei, CAO Yan-Bing, PENG Zhong-Dong, DU Ke. Ni, Mn-Codoped High-Voltage LiCoO₂ Cathode Material for Lithium Ion Batteries[J]. Chinese Journal of Inorganic Chemistry, 2015, (1): 159-165. doi: 10.11862/CJIC.2015.020 shu

Ni-Mn共掺杂高电压钴酸锂锂离子电池正极材料

1.
中南大学冶金与环境学院, 长沙 410083

通讯作者: 杜柯dukeben76@yahoo.com.cn

基金项目:
国家自然科学基金(No)资助项目. (No)

摘要: 以金属硫酸盐为原料,NaOH和NH₃·H₂O为沉淀剂,用共沉淀法合成了Co_0.9Ni_0.05Mn_0.05(OH)前驱体,再进行配锂并通过高温固相法合成了Ni-Mn共掺杂高电压钴酸锂锂离子电池正极材料Li(Co_0.9Ni_0.05Mn_0.05)O₂.用X射线衍射(XRD)、扫描电镜(SEM)、循环伏安(C-V)、交流阻抗(EIS)和充放电测试研究样品的晶体结构、形貌和电化学性能.结果表明Ni-Mn共掺杂正极材料Li(Co_0.9Ni_0.05Mn_0.05)O₂有优秀的电化学性能:在3.0~4.4V和3.0~4.5V区间,0.5C倍率下首次放电比容量分别为162.5mAh·g^-1和185mAh·g^-1,循环100次后容量保持率分别为94.4%和93.7%.

关键词:

高电压钴酸锂;共掺杂;共沉淀法;电化学性能

English

Ni, Mn-Codoped High-Voltage LiCoO₂ Cathode Material for Lithium Ion Batteries

1.
School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China

Corresponding author: 杜柯dukeben76@yahoo.com.cn

Received Date: 29 August 2014
Fund Project:
国家自然科学基金(No)资助项目.

Abstract: The precursor Co_0.9Ni_0.05Mn_0.05(OH)₂ of the high-voltage cathode material for lithium ion batteries was synthesized by hydroxide co-precipitation method using the transition metal sulphate as the raw material, NaOH and NH₃·H₂Oas the precipitate agents. Then the corresponding Li(Co_0.9Ni_0.05Mn_0.05)O₂ was obtained when mixing the precursor with Li₂CO₃ by high solid method. Crystal structure, morphology and electrochemical performance of the sample were investigated by XRD, SEM, Cyclic voltammetry (C-V) method, electrochemical impedance spectroscopy (EIS) test and charge-discharge test. Mixed doping Ni-Mn material Li(Co_0.9Ni_0.05Mn_0.05)O₂ shows better electrochemical performance compared to LiCoO₂ as confirmed by the results of C-V, XRD and EIS. When the co-doped product Li(Co_0.9Ni_0.05Mn_0.05)O₂ was charged to 4.4 and 4.5 V, the initial discharge capacity is 162.5 mAh·g^-1 and 185 mAh·g^-1 at 0.5Crate, respectively. After cycling for 100 times, the retention of discharge capacity was 94.4% and 93.7%, respectively.

Key words:

high-voltage LiCoO₂;codoped;co-precipitation;electrochemical performance

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Ni-Mn共掺杂高电压钴酸锂锂离子电池正极材料

通讯作者: 杜柯dukeben76@yahoo.com.cn

English

Ni, Mn-Codoped High-Voltage LiCoO₂ Cathode Material for Lithium Ion Batteries

Corresponding author: 杜柯dukeben76@yahoo.com.cn

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

Ni-Mn共掺杂高电压钴酸锂锂离子电池正极材料

通讯作者: 杜柯dukeben76@yahoo.com.cn

English

Ni, Mn-Codoped High-Voltage LiCoO2 Cathode Material for Lithium Ion Batteries

Corresponding author: 杜柯dukeben76@yahoo.com.cn

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

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CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs