Interpenetrating LiB/Li_(3)BN_(2) phases enabling stable composite lithium metal anode  

LiB/Li_(3)BN_(2)互穿相耦合的高稳定复合锂金属负极

作　　者：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 青飘;黄绍祯;娜仁托雅;李泉;黄海峰;龙科成;刘志坚;梅琳;孙富;韦伟峰;张瑜;马建民;吴志彬;陈立宝

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China [2]National Energy Metal Resources and New Materials Key Laboratory,Central South University,Changsha 410083,China [3]Department of Physics,The Chinese University of Hong Kong,Hong Kong 999077,China [4]Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao 266101,China [5]Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education,School of Chemistry,Beihang University,Beijing 100191,China [6]School of Chemistry,Tiangong University,Tianjin 300387,China

出　　处：《Science Bulletin》2024年第18期2842-2852,共11页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(92372117 and U22A20141);the National Key Research and Development Program of China(2023YFC3905904);Natural Science Foundation of Hunan Province(2022JJ20068);Natural Science Foundation of Changsha City(kq2208258);Innovation-Driven Project of Central South University(2023CXQD024)。

摘　　要：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/Li_(3)BN_(2)phases.As LiB fibers are anchored by Li_(3)BN_(2)granules,the collapse and slippage of LiB fibers are suppressed whilst the mechanical strength and structural stability of LBN are reinforced.By rolling,ultrathin(15μm),freestanding,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 m Ah cm^(-2)).Notably,the LiCoO_(2)(with double-sided load 40 mg cm^(-2))|LBN pouch cell can operate over450 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/Li_(3)BN_(2)dual-lithiophilic-phases.This work provides a new methodology for thin Li strip processing and reinforced-architecture design,with implications beyond battery applications.

关 键 词：Li metal anode ULTRATHIN Interpenetrating Li-B alloy Li_(3)BN_(2) 

分 类 号：TM912[电气工程—电力电子与电力传动] TB332[一般工业技术—材料科学与工程]