Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7725770 | Journal of Power Sources | 2018 | 8 Pages |
Abstract
Lithium (Li) metal plays an indispensable role in Li-S batteries, but its fast degradation seriously impedes the practical application of Li-S batteries. Here, an ion-conductive LAGP-based composite protective layer (CPL) consisting of lithium aluminum germanium phosphate (Li1.5Al0.5Ge1.5(PO4)3) and polyvinylidene fluoride (PVDF) is prepared on Li metal anode via a facile casting method. In the presence of LAGP, the negative effect of CPL on the diffusion of Li+ is minimized. Hence, it can not only effectively resist corrosive action of lithium polysulfides (LiPSs) on Li metal anode, but also reduce interfacial polarization and restrain dendritic Li growth. The protected Li anode exhibits exceptional cycling stability and low voltage polarization (â¼30Â mVÂ at 0.5Â mAÂ cmâ2) for 300Â h. The electrochemical performance of Li-S batteries with protected Li anode is also greatly enhanced. The discharge specific capacity of 832.1 mAh gâ1 and an average coulombic efficiency of 92% are obtained for up to 100 cycles at 0.5Â C in LiNO3-free electrolyte. Additionally, the rate capability of Li-S batteries is significantly improved, delivering a reversible capacity of 565 mAh gâ1Â at 4Â C. Our results also indicate this protection strategy can be extended to the Li-S pouch cells.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Changzhi Sun, Xiao Huang, Jun Jin, Yang Lu, Qing Wang, Jianhua Yang, Zhaoyin Wen,