首页|Universal architecture and defect engineering dual strategy for hierarchical antimony phosphate composite toward fast and durable sodium storage

Universal architecture and defect engineering dual strategy for hierarchical antimony phosphate composite toward fast and durable sodium storage

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Antimony(Sb)-based anode materials are feasible candidates for sodium-ion batteries(SIBs)due to their high theoretical specific capacity and excellent electrical conductivity.However,they still suffer from vol-ume distortion,structural collapse,and ionic conduction interruption upon cycling.Herein,a hierarchical array-like nanofiber structure was designed to address these limitations by combining architecture engi-neering and anion tuning strategy,in which SbPO4-x with oxygen vacancy nanosheet arrays are anchored on the surface of interwoven carbon nanofibers(SbPO4-x@CNFs).In particular,bulky PO43-anions miti-gate the large volume distortion and generate Na3PO4 with high ionic conductivity,collectively improv-ing cyclic stability and ionic transport efficiency.The abundant oxygen vacancies substantially boost the intrinsic electronic conductivity of SbPO4,further accelerating the reaction dynamics.In addition,hierar-chical fibrous structures provide abundant active sites,construct efficient conducting networks,and enhance the electron/ion transport capacity.Benefiting from the advanced structural design,the SbPO4-x@CNFs electrodes exhibit outstanding cycling stability(1000 cycles at 1.0 A g-1 with capacity decay of 0.05％per cycle)and rapid sodium storage performance(293.8 mA h g-1 at 5.0 A g-1).Importantly,systematic in-/ex-situ techniques have revealed the"multi-step conversion-alloying"reac-tion process and the"battery-capacitor dual-mode"sodium-storage mechanism.This work provides valuable insights into the design of anode materials for advanced SIBs with elevated stability and superior rate performance.

SbPO4 anodesHierarchical nanostructuresOxygen vacancyStress dispersionSodium-ion batteries

Jiawei Wu、Gaoyu Wang、Wei Zhang、Lixiang Wang、Jian Peng、Qinghua Li、Zhixin Liang、Wenbo Fan、Jiazhao Wang、Shaoming Huang

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School of Materials and Energy,Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices,Guangdong University of Technology,Guangzhou 510006,Guangdong,China

School of Mechanical and Electrical Engineering,Jiaxing Nanhu University,Jiaxing 314001,Zhejiang,China

Institute for Superconducting and Electronic Materials,Australian Institute for Innovative Materials,University of Wollongong,Innovation Campus,Squires Way,North Wollongong,NSW 2522,Australia

国家自然科学基金国家自然科学基金

5210222351920105004

2024

10.1016/j.jechem.2023.11.013

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.90(3)
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