Robust chemo-mechanical stability of additives-free SiO_(2)anode realized by honeycomb nanolattice for high performance Li-ion batteries  

作　　者：Xinpin Pan Yongjian Cui Zhe Wang Bowen Li Hailong Wang Jian Hao Feng Li Jing Li 

机构地区：[1]Advanced Energy Storage Materials Lab,School of Materials and New Energy,Ningxia University,Yinchuan 750021,China [2]School of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China

出　　处：《Chinese Chemical Letters》2024年第10期442-446,共5页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22379076,22268033,22108131);Natural Science Foundation of Ningxia(No.2023AAC02009);the Science Foundation for The Excellent Youth Scholars of Ningxia Hui Autonomous Region(Nos.2022AAC05018,2021AAC05002)。

摘　　要：Silicon-based anodes including Si,Si Oxand SiO_(2)could deliver ultra-large capacities,but degrade fast owing to huge volume change and low conductivity.Generally,large amounts of elastic binder and conductive additives were composited with nanosized silicon-based materials to yield reasonable cycling stability,which nevertheless not only decrease specific capacity but also induce inhomogeneous lithiation/delithiation as well as uneven stress variations.Artificial nanolattice has exhibited superior mechanical properties which could be ideal structure for silicon-based anodes,but yet faces challenges in integration of chemical reactivity,conductivity and mechanical stability.Herein,we fabricate artificial SiO_(2)honeycomb nanolattice consisting of numerous nanoscale SiO_(2)cells interconnected by through-holes,and conformal coating of highly graphitic carbon on the nanolattice is achieved through in situ catalytic graphitization.Moreover,the nanolattice is firmly bonded on Cu substrate through atomic interdiffusion irrespective of surface roughness.This unique structure allows fast charge transportation and homogeneous lithiation/delithiation throughout the micron-meter nanolattice,which results in excellent stability and large reversible capacity over 500 cycles at 1 A/g.The results highlight design and constructing artificial nanolattice can be an effective way to prevent chemo-mechanical degradation of silicon-based anode materials.

关 键 词：Li-ion batteries Nanolattice SiO_(2)anode Stability CONDUCTIVITY 

分 类 号：TM912[电气工程—电力电子与电力传动] O646[理学—物理化学]