首页|Interpenetrating LiB/Li3BN2 phases enabling stable composite lithium metal anode

Interpenetrating LiB/Li3BN2 phases enabling stable composite lithium metal anode

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Host-less lithium metal anode generally suffers from large volume changes and serious dendrite growth during cycling,which poses challenges for its practical application.Interpenetrating phase composites with continuous architectures offer a solution to enhance mechanical properties of materials.Herein,a robust composite Li anode(LBN)material is fabricated through the metallurgical reaction between Li and hexagonal boron nitride(h-BN)with the formation of interpenetrating LiB/Li3BN2 phases.As LiB fibers are anchored by Li3BN2 granules,the collapse and slippage of LiB fibers are suppressed whilst the mechanical strength and structural stability of LBN are reinforced.By rolling,ultrathin(15 pm),free-standing,and electrochemically stable LBN foil can be obtained.The LBN anode exhibits a high average Coulombic efficiency of 99.69％(1 mA cm-2,3 mAh cm-2)and a long lifespan of 2500 h(1 mA cm-2,1 mAh cm-2).Notably,the LiCoO2(with double-sided load 40 mg cm-2)|LBN pouch cell can operate over 450 cycles with a capacity retention of 90.1％.The exceptional cycling stability of LBN can be ascribed to the interpenetrating reinforcement architectures and synergistic electronic/ionic conductivity of the LiB/Li3BN2 dual-lithiophilic-phases.This work provides a new methodology for thin Li strip processing and reinforced-architecture design,with implications beyond battery applications.

Li metal anodeUltrathinInterpenetratingLi-B alloyLi3BN2

Piao Qing、Shaozhen Huang、Tuoya Naren、Quan Li、Haifeng Huang、Kecheng Long、Zhijian Liu、Lin Mei、Fu Sun、Weifeng Wei、Yu Zhang、Jianmin Ma、Zhibin Wu、Libao Chen

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State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China

National Energy Metal Resources and New Materials Key Laboratory,Central South University,Changsha 410083,China

State Key Laboratory of Powder Metallurgy,Central South University,Changsha,410083,China

Department of Physics,The Chinese University of Hong Kong,Hong Kong 999077,China

Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao 266101,China

Key Laboratory of Bioinspired Smart Interfacial Science and Technology of Ministry of Education,School of Chemistry,Beihang University,Beijing 100191,China

School of Chemistry,Tiangong University,Tianjin 300387,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaNatural Science Foundation of Hunan ProvinceNatural Science Foundation of Changsha CityInnovation-Driven Project of Central South University

92372117U22A201412023YFC39059042022JJ20068kq22082582023CXQD024

2024

10.1016/j.scib.2024.07.021

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(18)
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