CeO_2表面修饰提高锂离子电池正极材料LiNi_(0.80)Co_(0.15)Al_(0.05)O_2的循环及存储性能  

CeO_2 Surface Modification to Improve Cycle and Storage Performance on Lithium Ion Battery Cathode Material LiNi_(0.80)Co_(0.15)Al_(0.05)O_2

作　　者：夏书标[1] 张英杰[1] 董鹏[1] 杨瑞明[1] 张雁南[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《无机化学学报》2014年第3期529-535,共7页Chinese Journal of Inorganic Chemistry

基　　金：云南省自然科学基金(No.200680048M);曲靖师范学院校级基金(No.2010003)资助项目

摘　　要：采用共沉淀法制备锂离子电池正极材料LiNi0.8Co0.15Al0.05O2。通过溶胶凝胶法对LiNi0.8Co0.15Al0.05O2材料进行表面修饰提高循环和存储性能，包覆后的材料经过600 ℃热处理4 h。测试结果显示，0.2C下，CeO2包覆量为0.02%（物质的量比）时首次放电比容量为182.44 mAh·g-1，与未包覆样品相比没有下降；同时包覆后拥有更优的容量保持率，在2.75~4.3 V，0.5C下，100次循环后容量保持达到85.96%。包覆CeO2不仅可以阻止电极与电解液之间的副反应，而且高氧化性CeO2包覆层可以提前与电解液反应，从而消耗电解液中痕量的水和HF，保护内部活性材料。LiNi0.8Co0.15Al0.05O2 cathode material was successfully fabricated by co-precipitation. CeO2 coating use by sol-gel and subsequent heat treatment at 600 ℃ for 4 h, the CeO2 surface modification can improve cycle and storage performance. When CeO2 coating is 0.02% （molar ratio）, contrast to pristine NCA, the CeO2-coated LiNi0.8Co0.15Al0.05O2 cathode exhibits no decrease in its initial specific capacity of 182.44 mAh·g-1 at 0.2C and excellent capacity retention （85.96% of its initial capacity） between 4.3 and 2.75 V at 0.5C after 100th cycles. The results indicate that the surface treatment should be an effective way to improve cycle properties due to CeO2 inhibit the electrodes and the electrolyte side effects. CeO2 coating layer with highly oxidability can react with the electrolyte in advance to consume trace amounts of water and HF in the electrolyte, and protect the internal active material.

关 键 词：LINI0 8Co0 15Al0 05O2正极 CeO2包覆 循环性能 电解液 

分 类 号：TQ174[化学工程—陶瓷工业]