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Lithium lanthanum titanate perovskite as an anode for lithium ion batteries

2020; Nature Portfolio; Volume: 11; Issue: 1 Linguagem: Inglês

10.1038/s41467-020-17233-1

2041-1723

Lu Zhang, Xiaohua Zhang, Guiying Tian, Qinghua Zhang, Michael Knapp, Helmut Ehrenberg, Gang Chen, Zexiang Shen, Guochun Yang, Lin Gu, Fei Du,

Supercapacitor Materials and Fabrication

Abstract Conventional lithium-ion batteries embrace graphite anodes which operate at potential as low as metallic lithium, subjected to poor rate capability and safety issues. Among possible alternatives, oxides based on titanium redox couple, such as spinel Li 4 Ti 5 O 12 , have received renewed attention. Here we further expand the horizon to include a perovskite structured titanate La 0.5 Li 0.5 TiO 3 into this promising family of anode materials. With average potential of around 1.0 V vs. Li + /Li, this anode exhibits high specific capacity of 225 mA h g −1 and sustains 3000 cycles involving a reversible phase transition. Without decrease the particle size from micro to nano scale, its rate performance has exceeded the nanostructured Li 4 Ti 5 O 12 . Further characterizations and calculations reveal that pseudocapacitance dictates the lithium storage process and the favorable ion and electronic transport is responsible for the rate enhancement. Our findings provide fresh impetus to the identification and development of titanium-based anode materials with desired electrochemical properties.