Supercritical-hydrothermal accelerated solid state reaction route for synthesis of LiMn_2O_4 cathode material for high-power Li-ion batteries  

超临界水热合成结合固相煅烧制备高性能锂离子电池的锰酸锂正极材料(英文)

作　　者：刘学武[1,2] 汤洁[1] 覃旭松 邓远富[3] 陈国华[2,4] 

机构地区：[1]大连理工大学化工机械学院,大连116024 [2]广州市香港科大霍英东研究院绿色产品及加工技术研究中心,广州511458 [3]华南理工大学化学与化工学院,广州510640 [4]香港科技大学化学工程及生物分子工程学系

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第5期1414-1424,共11页中国有色金属学报（英文版）

基　　金：Project supported by the Research Funds of the Key Laboratory of Fuel Cell Technology of Guangdong Province,China;Project(7411793079907)supported by the Guangzhou Special Foundation for Applied Basic Research;Project(2013A15GX048)supported by the Dalian Science and Technology Project Foundation,China;Project(21376035)supported by the National Natural Science Foundation of China

摘　　要：Synthesis of the spinel structure lithium manganese oxide （LiMn2O4） by supercritical hydrothermal （SH） accelerated solid state reaction （SSR） route was studied. The impacts of the reaction pressure, reaction temperature and reaction time of SH route, and the calcination temperature of SSR route on the purity, particle morphology and electrochemical properties of the prepared LiMn2O4 materials were studied. The experimental results show that after 15 min reaction in SH route at 400 ℃ and 30 MPa, the reaction time of SSR could be significantly decreased, e.g. down to 3 h with the formation temperature of 800 ℃, compared with the conventional solid state reaction method. The prepared LiMn2O4 material exhibits good crystallinity, uniform size distribution and good electrochemical performance, and has an initial specific capacity of 120 mA.h/g at a rate of 0.1C （1C=148 mA/g） and a good rate capability at high rates, even up to 50C.采用超临界水热合成与高温固相合成相结合的方法制备亚微米级锂离子电池锰酸锂正极材料,研究超临界水热合成过程中的反应压力、反应温度、反应时间和高温固相合成过程中煅烧温度对合成材料的纯度、形貌及电化学特性的影响。结果表明:相对于传统的高温固相合成方法,在400°C和30 MPa的条件下,经过15 min超临界水热反应获得的LiMn2O4电池材料,在后续800°C煅烧温度下的煅烧时间可缩短到3 h。在该条件下合成的LiMn2O4正极材料具有良好的结晶度、均匀的粒度分布和优异的电化学性能,在0.1C下的首次放电比容量达到120 mA·h/g,且在50C的高倍率下仍然表现出良好的放电性能。

关 键 词：lithium ion battery LIMN2O4 supercritical water solid state reaction high rate capability 

分 类 号：TM912[电气工程—电力电子与电力传动]