Polydopamine-mediated synthesis of Si@carbon@graphene aerogels for enhanced lithium storage with long cycle life

作     者：Ningning Li Yi Liu Xiaoyu Ji Jiaxin Feng Kai Wang Jiayue Xie Guanglu Lei Xianghong Liu Xiangxin Guo Jun Zhang Ningning Li;Yi Liu;Xiaoyu Ji;Jiaxin Feng;Kai Wang;Jiayue Xie;Guanglu Lei;Xianghong Liu;Xiangxin Guo;Jun Zhang

作者机构：College of PhysicsQingdao UniversityQingdao 266071China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)Nankai UniversityTianjin 300071China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2021年第32卷第12期

页      面：3787-3792页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51972182 and 61971252) the Shandong Provincial Natural Science Foundation (Nos. ZR2020JQ27 and ZR2019BF008) the Youth Innovation Team Project of Shandong Provincial Education Department (No. 2020KJN015) 

主　　题：Si anode Carbon coating Graphene Aerogel Cycle life 

摘      要：The application of Si as the anode materials for lithium-ion batteries(LIBs) is still severely hindered by the rapid capacity decay due to the structural damage caused by large volume change( 300%) during cycling. Herein, a three-dimensional(3 D) aerogel anode of Si@carbon@graphene(SCG) is rationally constructed via a polydopamine-assisted strategy. Polydopamine is coated on Si nanoparticles to serve as an interface linker to initiate the assembly of Si and graphene oxide, which plays a crucial role in the successful fabrication of SCG aerogels. After annealing the polydopamine is converted into N-doped carbon(N-carbon) coatings to protect Si materials. The dual protection from N-carbon and graphene aerogels synergistically improves the structural stability and electronic conductivity of Si, thereby leading to the significantly improved lithium storage properties. Electrochemical tests show that the SCG with optimized graphene content delivers a high capacity(712 m Ah/g at 100 m A/g) and robust cycling stability(402 m Ah/g at 1 A/g after 1500 cycles). Furthermore, the full cell using SCG aerogels as anode exhibits a reversible capacity of 187.6 m Ah/g after 80 cycles at 0.1 A/g. This work provides a plausible strategy for developing Si anode in LIBs.