Tailoring the Spatial Distribution and Content of Inorganic Nitrides in Solid–Electrolyte Interphases for the Stable Li Anode in Li–S Batteries

Energy & Environmental Materials

article

Qi Jin¹  Kaixin Zhao¹  Lu Li¹  Xinzhi Ma¹  Lili Wu¹  Xitian Zhang¹ 

[1] Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University

关键词: Li anode;    Li dendrites;    LiPAA/LiNO3 layer;    SEI;    shuttle effect;   

DOI  :  10.1002/eem2.12230

来源: Wiley

【 摘 要 】

Among the alternatives to lithium-ion batteries, lithium–sulfur (Li–S) batteries are considered as an attractive option because of their high theoretical energy density of 2570 Wh kg −1 . However, the application of the Li–S battery has been plagued by the rapid failure of the Li anode due to the Li dendrite growth and severe parasitic reactions between Li and lithium polysulfides. The physicochemical properties of the solid–electrolyte interphase have a profound impact on the performance of the Li anode. Herein, a lithium polyacrylic acid/lithium nitrate (LPL)-protective layer is developed to inhibit the dendrite Li growth and parasitic reactions by tailoring the spatial distribution and content of LiN x O y and Li 3 N at the SEI. The modified SEI is thoroughly investigated for compositions, ion transport properties, and Li plating/stripping kinetics. Consequently, the Li–S cell with a high S loading cathode (5.0 mg cm −2 ), LPL layer-protected thin Li anode (50 μm), and 40 μL electrolyte shows a long life span of 120 cycles. This work evokes the avenue for regulating the spatial distribution of inorganic nitride at the SEI to suppress the formation of Li dendrites and parasitic reactions in Li–S batteries and perhaps guiding the design of analogous battery systems.

【 授权许可】

Unknown