多硫化物
四甲基铵
电解质
钝化
无机化学
化学
阳离子聚合
硫黄
锂(药物)
法拉第效率
电化学
化学工程
电极
材料科学
离子
图层(电子)
有机化学
物理化学
医学
工程类
内分泌学
作者
Yonghao Xiao,Zhongbo Liu,Jianlin Wu,Chang Liu,Yanqiu Peng,Yanchen Fan,Jian Chang,Zijian Zheng,Wei Huang,Guohua Chen,Yonghong Deng
标识
DOI:10.1016/j.xcrp.2023.101658
摘要
Lithium-sulfur batteries (LSBs) are promising energy-storage systems due to their high theoretical energy density. However, LSBs’ practical energy density is limited by a large electrolyte-to-sulfur (E/S) ratio (>5 μL mg−1 S), and their reversible operation encounters challenges from electrode passivation and Li dendrite formation. Herein, we report a strategy for enhancing LSBs’ performance by using a cationic surfactant-based electrolyte additive: tetramethylammonium hexafluorophosphate (TAHP). The stronger electrostatic interaction between the tetramethylammonium cation and the short-chain polysulfide (PS) anion promotes the reduction of long-chain PS to short-chain PS, inducing 3D particulate deposition of Li2S and thus increasing both sulfur utilization and discharge potential, alleviating electrode passivation. Moreover, tetramethylammonium cations can adsorb around Li protrusions to form a lithiophobic protective layer that inhibits the formation of Li dendrites. As a result, the TAHP lithium-sulfur pouch cell maintained an excellent capacity retention ratio with 78.3% after 250 cycles under lean-electrolyte conditions (4.5 μL mg−1 sufur [S]).
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