Al_2O_3包覆LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2的结构和性能  

Structure and performance of LiNi_(0. 8)Co_(0. 1)Mn_(0. 1)O_2coated with Al_2O_3

作　　者：王海涛[1,2] 段小刚 仇卫华[1,3] 

机构地区：[1]深圳市天骄科技开发有限公司,广东深圳518119 [2]中南大学化学化工学院,湖南长沙410083 [3]北京科技大学材料科学与工程学院,北京100083

出　　处：《电池》2014年第2期84-87,共4页Battery Bimonthly

基　　金：深圳市战略新兴产业发展专项资金(CXZZ20120618155141587)

摘　　要：用溶胶-凝胶法在前驱体表面包覆AlOOH,与LiOH＆#183;H2O烧结成Al2O3包覆LiNi0.8 Co0.1 Mn0.1 O2,对产物进行XRD、SEM及电化学性能分析.AlOOH均匀地包覆在前驱体表面,烧结产物为典型的α-NaFeO2层状结构.Al2O3包覆可降低LiNi0.8Co0.1Mn0.1O2的表面活性,减少与电解液的副反应,提高稳定性并改善高电压、高温循环及高温贮存性能.包覆产物以0.2 C（35 mA/g）在2.7～4.5 V（25℃）、2.7～4.2 V（55℃）循环,首次放电比容量分别为203.2 mAh/g、182.0 mAh/g,第50次循环的容量保持率分别为88.10％、89.07％;高温贮存240 h后的容量保持率和恢复率分别为91.83％和97.74％.AlOOH was coated on the surface of precursor by sol-gel method. Al2O3 coated LiNi0.8Co0.1Mn0.1O2 was synthesized by sintering the mixture of AIOOH coated precursor and LiOH. H20. XRD, SEM and electrochemical performance analyses were taken to the products. AIOOH was uniformly distributed on the surface of precursor, the sintered product still had typical structure of α-NaFeO2. Coating Al2O3 could decrease surface activity of LiNi0. 8Co0. lMn0.1O2, reduce the interaction with electrolyte, enhance the stability and improve high voltage, high temperature cycle, high temperature storage performance. When the coated product cycled in 2. 7 -4. 5 V （25 ℃ ）and 2. 7 - 4. 2 V （55 ℃ ） at 0. 2 C（ 35 mA/g）, the initial specific discharge capacity was 203.2 mAh/g, 182. 0 mAh/g, respectively,the capacity retention rate in the 50th cycle was 88.10% ,89.07% ,respectively. After high temperature stored for 240 h,the capacity retention rate and recovery rate was 91.83% and 97. 74% ,respectively.

关 键 词：氧化铝(Al2O3) 包覆 LiNi0.8Co0.1Mn0.1O2 结构 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]