Open AccessThree‐Layer Structured SnO 2 @C@TiO 2 Hollow Spheres for High‐Performance Sodium Storage
Author(s) -
Tian Yu,
Hu Ping,
Zhu Ting,
Liu Zhenhui,
Hu Guangwu,
Cai Congcong,
Jian Zelang,
Zhou Liang,
Mai Liqiang
Publication year - 2021
Publication title -
energy and environmental materials
Language(s) - English
Resource type - Journals
ISSN - 2575-0356
DOI - 10.1002/eem2.12117
Subject(s) - spheres , materials science , anode , layer (electronics) , conductivity , chemical engineering , nanotechnology , ion , chemistry , electrode , astronomy , engineering , physics , organic chemistry
The unsatisfactory conductivity and large volume variation severely handicap the application of SnO 2 in sodium‐ion batteries (SIBs). Herein, we design unique three‐layer structured SnO 2 @C@TiO 2 hollow spheres to tackle the above‐mentioned issues. The hollow cavity affords empty space to accommodate the volume variation of SnO 2 , while the C and TiO 2 protecting shells strengthen the structural integrity and enhances the electrical conductivity. As a result, the three‐layer structured SnO 2 @C@TiO 2 hollow spheres demonstrate enhanced Na storage performances. The SnO 2 @C@TiO 2 manifests a reversible capacity two times to that of pristine SnO 2 hollow spheres. In addition, Ex situ XRD reveals highly reversible alloying and conversion reactions in SnO 2 @C@TiO 2 hollow spheres. This study suggests the introduction of a hollow cavity and robust protecting shells is a promising strategy for constructing SIB anode materials.