Mitigating side reaction for high capacity retention in lithium-sulfur batteries

被引:23
作者
Cai, Yong [1 ]
Jin, Qi [1 ]
Zhao, Kaixin [1 ]
Ma, Xinzhi [1 ]
Zhang, Xitian [1 ]
机构
[1] Harbin Normal Univ, Sch Phys & Elect Engn, Key Lab Photon & Elect Bandgap Mat, Minist Educ, Harbin 150025, Peoples R China
基金
中国国家自然科学基金;
关键词
Nafion/TiO2; Artificial protection film; Li anode; Side reaction; Lithium-sulfur batteries; COMPOSITE MEMBRANES; NAFION; SHUTTLE; ANODE; SEI;
D O I
10.1016/j.cclet.2021.05.065
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Li-S batteries have shown great potential as secondary energy batteries. However, the side reaction between Li anodes and polysulfides seriously limited their practical application. Herein, the artificial protective film, which is consisted of Li-Nafion and TiO2, was designed and successfully prepared to achieve a corrosion-resistant Li anode in Li-S battery. In the composite protective film, the Li-Nafion could efficiently prevent the contact between Li anodes and polysulfides, and the incorporation of TiO2 nanopartides into the Nafion could significantly increase the ionic conductivity and mechanical strength of the protective film. Li-Li symmetric cells with an optimal artificial protective film exhibited an extended cyclelife of 750 h at a current density of 1 mA/cm(2) in Li2S8 electrolyte. Moreover, the Li-S full battery with an optimal protective Li anode exhibited higher capacity retention of 777.4 mAh/g after 100 cycles at 0.1 C as well as better rate performance than the cell with a pure Li anode. This work provides alternative insights to suppress the side reaction for Li-S batteries with high capacity retention. (C) 2021 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.
引用
收藏
页码:457 / 461
页数:5
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