化工进展 ›› 2022, Vol. 41 ›› Issue (8): 4386-4396.DOI: 10.16085/j.issn.1000-6613.2021-2007

• 材料科学与技术 • 上一篇    下一篇

微孔碳材料修饰的隔膜用于高性能锂硫电池

金玮()   

  1. 国网江西省电力有限公司,江西 南昌 330000
  • 收稿日期:2021-09-23 修回日期:2021-10-21 出版日期:2022-08-25 发布日期:2022-08-22
  • 通讯作者: 金玮

Microporous carbon modified separator for high performance lithium sulfur batteries

JIN Wei()   

  1. State Grid Jiangxi Electric Power Corporation, Nanchang 330000, Jiangxi, China
  • Received:2021-09-23 Revised:2021-10-21 Online:2022-08-25 Published:2022-08-22
  • Contact: JIN Wei

摘要:

锂硫电池具有较高的能量密度,是有发展前景的能量存储体系之一。但“穿梭效应”严重制约了锂硫电池的实际应用,为解决该问题,本文通过简单的一步热解法合成了孔径均匀的微孔碳材料,探究了微孔碳材料修饰隔膜后对锂硫电池性能的影响。结果表明,制备的微孔碳材料孔径集中在0.56nm左右,修饰隔膜后不仅能够有效抑制“穿梭效应”的产生,还有利于加快锂离子的传输,确保正极一侧溶解的多硫化物的再次利用。在0.1C的电流密度下,采用微孔碳材料修饰隔膜的电池首次放电比容量为1359mAh/g,循环100次之后容量能保持在966mAh/g,而修饰之前的传统聚丙烯隔膜,循环100次之后的比容量仅为409mAh/g;在1C的电流密度下循环500圈后,采用微孔碳材料修饰隔膜的电池容量保持率为88%,表现出优异的循环稳定性。

关键词: 微孔碳材料, 隔膜, 穿梭效应, 锂硫电池, 电化学, 纳米结构, 制备

Abstract:

Owing to the higher energy density, lithium-sulfur batteries have become one of the most promising energy storage systems. However, the shuttle effect derived from polysulfide hiders its large-scale commercial application. To solve this problem, a unique microporous carbon (UMC) via facile pyrolysis to modify separator in lithium sulfur battery was synthesized. The UMC with a uniform pore size of 0.56nm had abundant nanopores, facilitating lithium ion transportation and ensuring the re-used of polysulfides on the cathode side. With a current density of 0.1C, the initial discharge specific capacity of the battery was 1359mAh/g and the capacity retained 966mAh/g after 100 cycles. It also delivered good capacitance retention of 88% after 500 cycles, indicating excellent cycling stability. On the contrary, the specific capacity of commercial PP was only 409mAh/g after 100 times.

Key words: microporous carbon, modified separator, shuttle effect, lithium sulfur battery, electrochemistry, nanostructure, preparation

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