二维层状锂镧钛氧化物/类石墨烯复合材料用作锂离子电池电极
Two-dimensional layered lithium lanthanum titanium oxide/graphene-like composites as electrodes for lithium-ion batteries.
作者信息
Gu Bo, Zhan Chenyang, Liu Bing Heng, Wang Gang, Zhang Qian, Zhang Ming, Shen Zhongrong
机构信息
Faculty of Materials Metallurgy and Chemistry, Key Laboratory of Power Batteries and Relative Materials, Jiangxi University of Science and Technology, Ganzhou 341000, China.
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
出版信息
Dalton Trans. 2022 May 10;51(18):7076-7083. doi: 10.1039/d2dt00751g.
Perovskite-structured (ABO) lithium lanthanum titanate (LiLaTiO, LLTO) is widely used in all solid state lithium ion batteries due to its high ionic conductivity. In this study, a two-dimensional LLTO nanosheet/graphene (LLTO/C) nanosheet composite has been designed as an electrode material for lithium-ion batteries (LIBs). LLTO/C not only exhibits the ionic conductivity properties of perovskite-type LLTO, but the graphene between the layers of LLTO nanosheets also endows the material with additional electronic conductivity. Moreover, LLTO@C-600 exhibits an excellent rate capability as the electrode for delithiation with a high specific capacity of 350 mA h g at 20 mA g, and 70% of the specific capacity can be maintained at 1.0 A g after 800 cycles. The excellent electrochemical performances can be attributed to the superior interficial capacitive Li storage capability.
钙钛矿结构（ABO）的锂镧钛酸盐（LiLaTiO，LLTO）因其高离子电导率而被广泛应用于全固态锂离子电池。在本研究中，二维LLTO纳米片/石墨烯（LLTO/C）纳米片复合材料被设计用作锂离子电池（LIBs）的电极材料。LLTO/C不仅展现出钙钛矿型LLTO的离子导电特性，而且LLTO纳米片层间的石墨烯还赋予该材料额外的电子导电性。此外，LLTO@C-600作为脱锂电极表现出优异的倍率性能，在20 mA g时具有350 mA h g的高比容量，在1.0 A g下循环800次后仍可保持70%的比容量。优异的电化学性能可归因于其卓越的界面电容锂存储能力。
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