在MoO3中通过连贯接口与稳定Li+间隙固定格子
Shuo Sun1, Zhen Han2, Wei Liu1
1School of Materials Science and Engineering, Nanjing University of Science and Technology, 210094, Nanjing, PR China.
Nature communications
|October 20, 2023
概括
一种新的格子固定策略稳定了固态电池中的α-三氧化物 (α-MoO) 电极. 这种方法显著减少了结构性降解,提高了电池循环寿命和性能.
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
- 纳米技术纳米技术
背景情况:
- 固态电池由于离子间隙/脱间隙过程中体积变化较大而遭受电极降解.
- 层层的正交三氧化 (α-MoO3) 在b轴上呈现出显著的晶格扩张,造成不可逆转的结构损伤和限制电池周期寿命.
研究的目的:
- 开发一种策略,以减轻α-MoO3电极的结构退化,以提高固态电池性能.
- 在电化学循环过程中使用异构结构来稳定α-MoO3的格子固定方法的有效性.
主要方法:
- 在α-MoO3和η-Mo4O11之间构建一个连贯的接口,具有表轴间生长结构.
- 利用 η-Mo4O11的最小格子变化作为引脚中心来抑制α-MoO3格子扩张.
- 描述设计的异构结构的结构稳定性和电化学性能.
主要成果:
- α-MoO3/η-Mo4O11异构结构显著减少了沿b方向的晶格扩张,从约16%降至2%.
- 交织的异构结构表现出强大的结构稳定性,在3000个循环以2Ag-1后保持大约81%的容量.
- 使用稳定电极成功制造了一种高度耐用和灵活的全固态薄膜微电池.
结论:
- 格子固定策略有效地抑制α-MoO3的结构降解,提高其作为电极材料的适用性.
- 在异构结构中表轴稳定和固定效应为开发用于先进电池的高度稳定的电极材料提供了一个有希望的途径.
- 这项研究为α-MoO3的结构演变提供了基本的见解,并为下一代固态电池提供了可行的方法.
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