Understanding the phenomenon of capacity increasing along cycles: In the case of an ultralong-life and high-rate SnSe-Mo-C anode for lithium storage

时间:2022-07-05作者:浏览量:30


Understanding the phenomenon of capacity increasing along cycles: In the case of an ultralong-life and high-rate SnSe-Mo-C anode for lithium storage

作者:

Wu, X (Wu, Xin) [1] ; Xiong, XY (Xiong, Xingyu) [1] ; Yuan, B (Yuan, Bin) [1] ; Liu, J (Liu, Jun) [1] ; Hu, RZ (Hu, Renzong) [1]

JOURNAL OF ENERGY CHEMISTRY

卷72

页133-142

DOI10.1016/j.jechem.2022.05.003

出版时间SEP 2022

已索引2022-06-25

文献类型Article

摘要

A good cycling stability is a prerequisite for the application of metal-based materials in lithium-ion batteries (LIBs). However, an abnormal increase in capacity is often observed, which has rarely been focused on in many studies. In our SnSe-Mo-C composite anode, a high reversible capacity of 737.4 mAh g(1) remained after 5000 cycles at 5 A g(1) between 0.01 and 3.0 V versus Li/Li'. However, a continuous capacity increase occurred in the initial cycles, with 1086.9 mAh g(1) after 1000 cycles and 1216.9 mAh g-(1) after 1500 cycles, respectively. Further studies revealed that the electrolyte decomposed at high potentials (2.5-3.0 V) and provided additional capacities. The cut-off voltage and electrolyte filling were controlled, which eliminated the impact of electrolyte decomposition, prevented rapid capacity decay, and provided a stable cycling performance for SnSe-Mo-C anodes in LIBs. This work shows that the composite anode is promising for lithium storage and the findings provide new insights into understanding and controlling the phenomenon of capacity increase with cycling in metal-based anode materials.(c) 2022 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.


关键词

作者关键词Lithium-ion batterySnSeCapacity increaseElectrolyte decomposition

Keywords PlusHIGH-PERFORMANCE ANODESODIUM-IONCARBONNANOPARTICLESELECTROLYTECOMPOSITEBATTERIESORIGINNANOCRYSTALSINTERFACE

作者信息

通讯作者地址

Hu, Renzong

(通讯作者)

South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Guangdong, Peoples R China

地址

1 South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Guangdong, Peoples R China

电子邮件地址msrenzonghu@scut.edu.cn

类别/分类

研究方向ChemistryEnergy & FuelsEngineering