首页|Ti3C2Tx MXene in-situ transformed Li2TiO3 interface layer enabling 4.5 V-LiCoO2/sulfide all-solid-state lithium batteries with superior rate capability and cyclability

Ti3C2Tx MXene in-situ transformed Li2TiO3 interface layer enabling 4.5 V-LiCoO2/sulfide all-solid-state lithium batteries with superior rate capability and cyclability

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All-solid-state lithium batteries(ASSLBs)based on sulfide electrolytes promise next-generation energy storage with high energy density and safety.However,the sulfide electrolytes suffer from phase instabil-ity and sluggish interfacial charge transport when pairing with layered oxide cathodes at high voltages.Herein,a simple and efficient strategy is proposed using two-dimensional Ti3C2Tx MXene as starting ma-terial to in-situ construct a 15 nm Li2TiO3 layer on a typical oxide cathode,LiCoO2.The in-situ transforma-tion of Ti3C2Tx into Li2TiO3 layer occurs at a low temperature of 500 ℃,avoiding the phase deterioration of LiCoO2.The thin Li2TiO3 layer is Li+conducting and electrochemically stable,thereby preventing the interfacial decomposition of sulfide electrolytes induced by LiCoO2 at high voltages and facilitating Li+transport at the interface.Moreover,Li2TiO3 can stabilize the layer structure of LiCoO2 at high voltages.Consequently,the sulfide-based ASSLB using LiCoO2@Li2TiO3 cathode can operate stably at a high voltage of up to 4.5 V(vs.Li+/Li),delivering an outstanding initial specific discharge capacity of 138.8 mAh/g with a high capacity retention of 86.2％after 100 cycles at 0.2 C.The in-situ transformation strategy may also apply to other MXenes,offering a general approach for constructing other advanced lithiated coatings for oxide cathodes.

Solid sulfide electrolyteOxide cathodeMXeneIn-situ transformationLi2TiO3 interfacial layer

Yaping Wang、Pengcheng Yuan、Zeyuan Xu、Xiong-Xiong Liu、Shengfa Feng、Mufan Cao、Chen Cao、Xiaoqiang Wang、Long Pan、Zheng-Ming Sun

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Key Laboratory of Advanced Metallic Materials of Jiangsu Province,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China

CALB Technology Co.,Ltd.,Changzhou 213200,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Jiangsu ProvinceNatural Science Foundation of Jiangsu ProvinceYoung Elite Scientists Sponsorship Program by CASTFundamental Research Funds for the Central Universities

5220124252250010BK20200386BK202001862021QNRC0012242022R40018

2024

10.1016/j.cclet.2023.108776

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(6)
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