Borohydride Ammoniate Solid Electrolyte Design for All-Solid-State Mg Batteries

扫码查看

原文链接

NETL
NSTL
万方数据

外文摘要：Searching for novel solid electrolytes is of great importance and challenge for all-solid-state Mg batteries.In this work,we develop an amorphous Mg borohydride ammoniate,Mg(BH4)2·2NH3,as a solid Mg electrolyte that prepared by a NH3 redistribution between 3D framework-γ-Mg(BH4)2 and Mg(BH4)2·6NH3.Amorphous Mg(BH4)2·2NH3 exhibits a high Mg-ion conductivity of 5 × 10-4 S cm-1 at 75 ℃,which is attributed to the fast migration of abundant Mg vacancies according to the theoretical calculations.Moreover,amorphous Mg(BH4)2·2NH3 shows an apparent electrochemical stability window of 0-1.4 V with the help of in-situ formed interphases,which can prevent further side reactions without hindering the Mg-ion transfer.Based on the above superiorities,amorphous Mg(BH4)2·2NH3 enables the stable cycling of all-solid-state Mg cells,as the critical current density reaches 3.2 mA cm-2 for Mg symmetrical cells and the reversible specific capacity reaches 141 mAh g-1 with a coulombic efficiency of 91.7％(first cycle)for Mg||TiS2 cells.

外文关键词：

all-solid-state Mg batteriesamorphizationMg borohydride ammoniateMg vacancy migrationsolid electrolyte

作者：

Yuepeng Pang、Zhengfang Nie、Fen Xu、Lixian Sun、Junhe Yang、Dalin Sun、Fang Fang、Shiyou Zheng

展开 >

作者单位：

School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China

Guangxi Key Laboratory of Information Materials & Guangxi Collaborative Innovation Centre of Structure and Property for New Energy and Materials,Guilin University of Electronic Technology,Guilin 541004,China

Department of Materials Science, Fudan University, Shanghai 200433, China

出版年：

2024

DOI：

10.1002/eem2.12527

能源与环境材料(英文)

ISSN：

年,卷(期)：2024.7(1)