Sn Anodes Protected by Intermetallic FeSn2 Layers for Long-lifespan Sodium-ion Batteries with High Initial Coulombic Efficiency of 93.8 %

被引：38

作者：

Chen, Ming ^{[1
,2
]}

Xiao, Ping ^{[3
]}

Yang, Ke ^{[1
,2
]}

Dong, Boxu ^{[1
,2
]}

Xu, Dong ^{[1
,2
]}

Yan, Changyu ^{[1
,2
]}

Liu, Xuejiao ^{[1
,2
]}

Zai, Jiantao ^{[1
,2
]}

Low, CheeTong John ^{[4
]}

Qian, Xuefeng ^{[1
,2
]}

机构：

[1] Shanghai Jiao Tong Univ, Shanghai Electrochem Energy Devices Res Ctr, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China

[3] Nanjing Univ Chinese Med, Natl & Local Collaborat Engn Ctr Chinese Med Resou, Nanjing 210023, Peoples R China

[4] Univ Warwick, Energy Innovat Ctr, Warwick Electrochem Engn Grp, WMG, Warwick CV4 7AL, England

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2023年 / 62卷 / 16期

基金：

中国国家自然科学基金;

关键词：

Initial Coulombic Efficiency; Sn; Fesn(2)@C Anode; Sodium-Ion Batteries; Stability; HIGH-PERFORMANCE ANODE; HIGH-ENERGY-DENSITY; LITHIUM-ION; TIN; CARBON; NANOPARTICLES; INSERTION;

D O I：

10.1002/anie.202219177

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

With a theoretical capacity of 847 mAh g(-1), Sn has emerged as promising anode material for sodium-ion batteries (SIBs). However, enormous volume expansion and agglomeration of nano Sn lead to low Coulombic efficiency and poor cycling stability. Herein, an intermetallic FeSn2 layer is designed via thermal reduction of polymer-Fe2O3 coated hollow SnO2 spheres to construct a yolk-shell structured Sn/FeSn2@C. The FeSn2 layer can relieve internal stress, avoid the agglomeration of Sn to accelerate the Na+ transport, and enable fast electronic conduction, which endows quick electrochemical dynamics and long-term stability. As a result, the Sn/FeSn2@C anode exhibits high initial Coulombic efficiency (ICE=93.8 %) and a high reversible capacity of 409 mAh g(-1) at 1 A g(-1) after 1500 cycles, corresponding to an 80 % capacity retention. In addition, NVP//Sn/FeSn2@C sodium-ion full cell shows outstanding cycle stability (capacity retaining rate of 89.7 % after 200 cycles at 1 C).

引用

页数：6

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