Defective Boron Nitride Inducing the Lithium-ion Migration on the Sub-Surface of LiBH_4

Ziqiang Wu; Kaiwen Wang; Weiwei SunZhipeng LiZhihong MaYunfeng ZhuYongjin ZouYao Zhang

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Defective Boron Nitride Inducing the Lithium-ion Migration on the Sub-Surface of LiBH_4

机译：Defective Boron Nitride Inducing the Lithium-ion Migration on the Sub-Surface of LiBH_4

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The safety issues oflithium-ion batteries provoke the development of highlysecure solidelectrolytes. Hydride electrolytes owning the high electrochemicalstabilityand anode compatibility may sufficiently relieve theconcerns of safety.However, the low ionic conductivity at room temperature hampersits furtherapplication. Herein, the strategy of defect-induced (BH_4)~– deformation toachieve high ionicconductivity LiBH_4/BN composite electrolyte is suggested.The theoreticalcalculations indicate that the volume of the (BH_4)~– tetrahedronis expanded by 14. Such atetrahedron deformation weakens the Li-Hinteraction forces in LiBH_4, and thus promotes the Li-ion migration. TheLiBH_4/BN composites are enabled to deliver lithium ionicconductivity of1.15 × 10~(-4) S cm~(-1) at 40 ℃ with a Li-ion transference number of 97, persuadingan excellent solidelectrolyte for all-solid-state batteries. The subsurfaceof LiBH_4 offers the lowest migration barrier among all possiblechannels,paving the optimal way for Li-ion migration. Furthermore, theLiBH_4/BN electrolytes supply excellent electrochemical stabilityand electrodecompatibility. The utilized strategy of outfield induction (notonly defects)and ligand deformation (not only (BH_4)~–) may also be extended to othersolid electrolytes.

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《Advanced functional materials》 |2022年第43期|2205677.1-2205677.13|共13页
作者
Ziqiang Wu; Kaiwen Wang; Weiwei SunZhipeng LiZhihong MaYunfeng ZhuYongjin ZouYao Zhang;
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作者单位

Guangxi Key Laboratory of Information MaterialsGuilin University of Electronic TechnologyGuilin 541004, P. R. China;

School of Materials Science and EngineeringJiangsu Key Laboratory of Advanced Metallic MaterialsSoutheast UniversityNanjing 211189, P. R. China;

Beijing Key Lab of Microstructure and Properties of Advanced MaterialsBeijing University of TechnologyBeijing 100124, P. R. ChinaSEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry ofEducationSoutheast UniversityNanjing 210096, P. R. ChinaSchool of Materials Science and EngineeringBaise UniversityBaise 533000, P. R. ChinaCollege of Materials Science and EngineeringJiangsu Collaborative Innovation Centre for Advanced InorganicFunction CompositesNanjing Tech University30 South Puzhu Road, Nanjing 211816, P. R. China;

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LiBH_4; defective BN; hydride electrolytes; ion migration;

Defective Boron Nitride Inducing the Lithium-ion Migration on the Sub-Surface of LiBH_4

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