阴极
电极
化学
多硫化物
三聚氰胺
退火(玻璃)
Crystal(编程语言)
化学工程
材料科学
物理化学
计算机科学
有机化学
工程类
电解质
复合材料
程序设计语言
作者
Ben Chen,Boxin Li,Jing Bi,Hongfang Du,S. L. Wang,Lei Liu,Linghai Xie,Jianyu Sun,Zhuzhu Du,Wei Ai
摘要
Placing blocking layers between electrodes has shown paramount prospects in suppressing the shuttle effect of Li-S batteries, but the associated ionic transport would be a concurrent obstacle. Herein, we present a Li-based crystal composited with carbon (LiPN2@C) by a one-step annealing of Li+ absorbed melamine polyphosphate, which simultaneously achieves alleviated polysulfide-shuttling and facilitated Li+ transport. As a homologous crystal, LiPN2 with abundant lithiophilic sites makes Li+ transport more efficient and sustainable. With a LiPN2@C-modified separator, the Li2S cathode exhibits a much-lower activation potential of 2.4 V and a high-rate capacity of 519 mA h g-1 at 2C. Impressively, the battery delivers a capacity of 726 mA h g-1 at 0.5C with a low decay rate of 0.25% per cycle during 100 continuous cycles.
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