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通过聚合物进化诱导的动态阳极/阴极-电解质接口,用于耐用金属电池.

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一个新的人工接口 (MAF) 稳定了金属电池,同时防止了树的生长和阴极粒子的扭曲. 这种共聚合物接口增强了对立体Li和对称Li的LFP/NCM811细胞的循环稳定性.

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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:

  • 固体电解质接口 (SEI) 工程对于金属电池 (LMB) 的循环性至关重要.
  • 需要同时稳定阳极和阴极以克服性能限制.

研究的目的:

  • 为LMBs开发一个双功能的人工接口,它既解决了Li树突的增长,也解决了阴极粒子的扭曲.
  • 调查电池循环期间接口的动态演变和贡献.

主要方法:

  • 无水化物 (MA) 和六布烯酸盐 (HFA) 的共聚合,在阳极上创建MAF接口.
  • 在电化学测试中,对立的基体细胞,基体LiFePO4 (LFP) 细胞和基体LiNi0.8Co0.1Mn0.1O2 (NCM811) 细胞进行了测试.

主要成果:

  • MAF层形成了一个混合SEI,内在有机,外在是聚合物,促进了均的Li+涂层.
  • 在MAF中的化寡合物动态成熟LiF丰富的阴极电解质接口 (CEI).
  • 经过900小时的循环,对称的Li PaddyLi单元; Li PaddyLi LFP和Li PaddyLi NCM811单元分别在1500和350个循环后显示了90.2%和80.6%的容量保留.

结论:

  • 在LMB中,MAF接口有效地抑制了Li树突的生长和阴极降解.
  • 动态接口的演变是提高高能LMB的长期循环稳定性和性能的关键.