A self-healing liquid metal anode for lithium-ion batteries

作     者：Yaqin Qi Chao Shen Qian Hou Zengying Ren Ting Jin Keyu Xie Yaqin Qi;Chao Shen;Qian Hou;Zengying Ren;Ting Jin;Keyu Xie

作者机构：State Key Laboratory of Solidification ProcessingCenter for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi’an 710072ShaanxiChina Research&Development Institute of Northwestern Polytechnical University in ShenzhenNorthwestern Polytechnical UniversityShenzhen 518057GuangdongChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第9期

页      面：522-531,I0015页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(51974256 and 52034011) the Science,Technology,and Innovation Commission of Shenzhen Municipality(JCYJ20180508151856806) the Fundamental Research Funds for the Central Universities(G2020KY05129) the Outstanding Young Scholars of Shaanxi(2019JC-12) the Natural Science Basic Research Plan in Shaanxi Province of China(2019JLZ-01 and 2019JLM-29) the Fundamental Research Funds for the Central Universities(3102021ZD0401,3102021TS0406,and 3102019JC005) 

主　　题：Liquid metal Self-healing Polypyrrole Li-ion battery Stability 

摘      要：The gallium-based liquid metal as one of the self-healing materials has gained wide attention, especially in the energy storage system. However, volume expansion with the ‘‘liquid-solid-liquidtransformation process still leads to un-controlled electrode failure, which stimulates the irreversibility of liquid metal and hinders their self-healing effect as the anode for lithium-ion batteries. Herein, the polypyrrole(PPy) with highly conductive and adhesive features is first introduced to fasten the liquid metal nanoparticles(gallium-tin alloy, EGaSn) in the integrated electrode and applied as the anode for lithium-ion batteries. A tightly PPy wrapped EGaSn nanoparticles structure is formed during the in-situ polymerization synthesis process, which effectively avoids the detachment of solid alloyed products. Based on the features of PPy, polyacrylic acid is added to facilitate strengthening the integrity of the electrode by constructing the hydrogen bond. The ‘‘dual-insurance design endows the EGaSn to exhibit superior electrochemical kinetics and an astonishing self-healing effect. As a result, the customized anode displays superior cycling stability(499.8 mAh g^(-1) after 500 cycles at 1.0 A g^(-1))and rate capability(350 mAh g^(-1) at 2.0 A g^(-1)).This work enriches the electrode engineering technology of liquid metal nanoparticles and opens up a new way to customize the self-healing anode for lithium-ion batteries.