物理化学学报2017，Vol.33Issue(6)：1189-1196,8.DOI:10.3866/PKU.WHXB201702221
表面活性剂对氧化铝修饰富锂锰基正极材料的影响
Effects of Surfactants on Al2O3-Modified Li-Rich Layered Metal Oxide Cathode Materials for Advanced Li-Ion Batteries
摘要
Abstract
In this work,a series of Li-rich layered metal oxides (LLMO) were prepared by the coprecipitation method for use as cathode materials in lithium ion batteries.Various surfactants were used for the preparation of Al2O3-modified LLMO.The roles of surfactants were systematically investigated to reveal the mechanism of AI2O3 modification.The microstructure and morphology of the as-prepared samples were studied by the X-ray diffraction (XRD),scanning electron microscopy (SEM),and transmission electron microscopy (TEM).The electrochemical performance was evaluated by means of cyclic voltammetry,galvanostatic charge/discharge,and electrochemical impedance spectroscopy.The experimental results showed that Al2O3 nanoparticles were uniformly dispersed on the LLMO surface using N,N,N-trimethyl-1-dodecanaminium bromide (DTAB) as the surfactant,to obtain an initial discharge capacity of 186 mAh·g-1 at the current density of 600 mA·g-1.After 500 cycles,the reversible discharge capacity was 132 mAh.g-1 with a satisfactory capacity retention of 71％.Moreover,the voltage fading of the LLMO was greatly suppressed after Al2O3 modification.Therefore,the Al2O3-modified LLMO exhibited superior electrochemical performances compared with unmodified LLMO.关键词
表面活性剂/锂离子电池/正极材料/氧化铝/富锂锰材料Key words
Surfactant/Lithium-ion battery/Cathode material/Aluminum oxide/Li-rich layered metal oxide分类
化学化工引用本文复制引用
甘永平,张文魁,林沛沛,黄辉,夏阳,梁初,张俊,王奕顺,韩健峰,周彩红..表面活性剂对氧化铝修饰富锂锰基正极材料的影响[J].物理化学学报,2017,33(6):1189-1196,8.基金项目
The project was supported by the National Natural Science Foundation of China (21403196,51572240,51677170),Natural Science Foundation of Zhejiang Province,China (LY15B030003,LY16E070004,LY17E020010) and Ford University Research Program,China.国家自然科学基金(21403196,51572240,51677170),浙江省自然科学基金(LY15B030003,LY16E070004,LY17E020010)和福特汽车公司高校研究项目资助 （21403196,51572240,51677170）
