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通过设计阴极固体电解质接口,提高铁三化物基固态电池在高温下的循环性能.

Huan Hu1, Xuedong Zhang1, Zhenren Gao1

  • 1School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan, 411105, P. R. China.

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|November 21, 2023
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概括

稳定铁三化物 (FeF3) 电池中的阴极接口,使用兴奋剂显著提高了循环寿命. 这一创新使得高能量密度的离子电池可以实现超过1000个循环.

关键词:
阴极固体电解质接口接口密度函数理论密度函数理论金属化物正极是金属化物正极.固态电池是一种固态电池.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 电池技术 电池技术

背景情况:

  • 铁三化物 (FeF) 由于其低成本,为高能量密度的离子电池提供了潜力.
  • 在高温下FeF3阴极的快速性能降解是由不稳定的阴极固体电解质接口 (CEI) 和材料溶解引起的.

研究的目的:

  • 为了提高离子电池中的FeF3基阴极的循环性能和稳定性.
  • 通过盐组成工程来研究CEI稳定机制.

主要方法:

  • 工程盐组成,将 (B) 纳入聚合物电解质中.
  • 使用先进的电子显微镜和密度函数理论 (DFT) 计算.
  • 在60°C时制造和测试FeF3基复合阴极.

主要成果:

  • 一个稳定的Fe3O4类型的CEI,化 (BOR-CEI),在60°C时成功形成.
  • 基于FeF3的阴极证明了超过1000个循环,理论容量的利用率高达70%.
  • 兴奋剂增强了CEI的弹性和机械强度,防止了活性物质的溶解.

结论:

  • 通过结合来设计CEI组成是一种可行的策略,可以提高FeF3阴极的耐用性和性能.
  • 稳定的BOR-CEI显著延长了离子电池的循环寿命.
  • 这种方法解决了高能量密度电池系统中活性物质溶解的关键挑战.