Hierarchical yolk-shell structured Li-rich cathode boosting cycling and voltage stabled LIBs

查看全文 作　　者：Yanchen [1,2]Liu;Yafen [1]Chen;Jing [1]Wang;Wei [1]Wang;Zhiyu [1]Ding;Leyuan [1]Li;Yang [1]Zhang;Yida [2,3]Deng;[1]JunweiWu;Yanan [2]Chen

机构地区：[1]Shenzhen Key Laboratory of Advanced Materials,Department of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China;[2]School of Materials Science and Engineering,Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education,Tianjin Key Laboratory of Composite and Functional Materials,Tianjin University,Tianjin 300072,China;[3]School of Materials Science and Engineering,Hainan University,Haikou 570228,China

出　　处：《Nano Research》索引2022年第15卷第4期,共9页

基　　金：The authors acknowledge the financial support from Natural Science Foundation of Guangdong Province(No.2018A030313721);the National Key Research and Development Program of China(No.2018YFB0703500);the National Natural Science Foundation of China(No.91963113). 摘　　要：Despite the high energy density of lithium-rich(Li-rich)cathodes,their implementation is hampered by the unsatisfied rate capacity and poor cycling performance accompanied with substantial voltage decay.To address these issues,the hierarchical yolk-shell structured Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)cathodes(YK-LMNCO)was proposed and synthesized through a facile glycerol assisted solvothermal approach and the following lithiation process.Benefitting from the shortened lithium diffusion lengths and the enhanced tolerance to the large volume variation upon lithium ions intercalation/de-intercalation,the unique structure reciprocates an initial coulombic efficiency of 85.8%,an outstanding capacity retention rate of 89.1%after cycling at 2.0 C for 200 cycles with a minor voltage drop,and a capacity retention rate of 93.8%after cycling at 10.0 C for 500 cycles,85.2%for 1,000 cycles.When assembled with graphite as anode,the YK-LMNCO//graphite full cell shows a remarkable capacity retention rate of 87.2%after cycling at 5.0 C for 50 cycles.Our facile strategy for constructing the yolk-shell structured Li-rich cathodes with high capacity and voltage stability sheds light on synthesizing other lithium storage materials. 关键词：lithium-rich(Li-rich)layered oxides yolk-shell structure CATHODE cycling stability lithium-ion battery(LIBs)

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Hierarchical yolk-shell structured Li-rich cathode boosting cycling and voltage stabled LIBs

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