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镁离子掺杂锂离子电池硅酸锰锂正极材料
作者:赵宏滨1 2 吴晓燕1 李永1 沈嘉年2 徐甲强1 
单位:1. 上海大学理学院化学系 上海200444 2. 上海大学材料科学与工程学院 上海 200444 
关键词:硅酸锰锂 镁离子掺杂 锂离子电池 碳包覆  溶胶凝胶法 
分类号:TQ171
出版年,卷(期):页码:2011,39(7):46-51
DOI:
摘要:

以MgAC2为掺杂剂,葡萄糖碳化为碳包覆源,通过溶胶凝胶法制备了含有镁离子的硅酸锰锂正极材料前驱体,在惰性气保护下经高温焙烧得到碳包覆的硅酸锰锂正极材料。对镁离子掺杂对硅酸锰锂物理和电化学性能的影响进行了探讨。交流阻抗和循环伏安测试表明,碳包覆和低含量镁离子掺杂不会破坏硅酸锰锂的材料,并且显著提高了电子传导过程的电导率,同时硅酸锰锂正极材料的循环性能得到提高。0.1C倍率放电测试显示,镁离子掺杂和非掺杂的硅酸锰锂的不可逆比容量分别有289 mA·h/g和248 mA·h/g。经过20次循环,其容量分别保持在155 mA·h/g和122 mA·h/g。与未掺杂的硅酸锰锂相比,镁离子掺杂后,硅酸锰锂的循环稳定性得到极大的提高。

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Stoichiometric Mg-doped Li2MnSiO4 cathode material was synthesized by a sol-gels process with magnesium acetate dehydrate as a dopant and sucrose as carbon-coating materials and subsequent high temperature treatment in an inert atmosphere. The effect of Mg2+ doping on the physical and electrochemical properties of the as-prepared cathode materials was investigated. AC impedance spectra and cycle voltammagram results showed that the carbon coating and low concentration Mg2+ doping do not destroy the structure of Li2MnSiO4, but enhance the electron conductivity during the electron translation procedure. Moreover, the cycle performance was improved. At a discharging rate of 0.1C, the reversible specific capacities of the Mg-doped lithium magnesium silicate and the un-doped Li2MnSiO4 were 289 and 248 mA·h/g, respectively. After 20 cycles, the capacities were 155 and 122 mA·h/g, respectively. By Mg ions doping, Li2MnSiO4 exhibited a more stable cycle performance than that of Li2MnSiO4/C cathode material.

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参考文献:

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