高度O3型阴极的不均协调使压制的石板滑动和持久的储存成为可能
Shengyu Zhao1, Fanghua Ning1, Xuan Yu1
1Institute for Sustainable Energy & College of Science, Shanghai University, Shanghai, 200444, China.
Angewandte Chemie (International ed. in English)
|October 10, 2024
概括
高层氧化物为离子电池 (SIB) 提供了卓越的结构稳定性和空气稳定性. 这种新的阴极材料消除了复杂的相位过渡,使SIB的周期寿命长,并有望实现SIB的商业可行性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- O3型层氧化物是离子电池 (SIB) 的有希望的阴极.
- 这些材料遭受复杂的相位过渡和空气敏感性,限制其性能和商业化.
- 开发稳定且耐空性阴极材料对于推进SIB技术至关重要.
研究的目的:
- 为SIBs设计和合成高层氧化物阴极材料.
- 研究新材料的结构稳定性和电化学性能.
- 评估开发的阴极的空气稳定性和商业应用潜力.
主要方法:
- 一个分层的氧化物阴极 (NaNi0.29Cu0.1Mg0.05Li0.05Mn0.2Ti0.2Sn0.11O2) 的高构成设计.
- 理论计算和实验验证,以研究TMO2板块的滑动能量.
- 准固态电池中的电化学测试和空气稳定性的评估.
- 构建和测试一个Ah尺度的囊细胞.
主要成果:
- 高设计导致过渡金属元素的不均协调环境,增强了板块滑动的能量.
- 在传统的O3型阴极中观察到的复杂相位过渡 (O3-O'3-P3-P'3-P3'-O3') 的消除.
- 特殊的结构稳固性和超长的周期寿命,在准固态电池中在2°C下1000个周期后保持73.2%的容量.
- 在直接暴露于空气时,空气稳定性令人满意,降解最小.
- 一个Ah级袋式电池在500个循环后显示出83.6%的容量保留.
结论:
- 高层氧化物为SIBs开发稳定和高性能阴极材料提供了一个有希望的策略.
- 这种新的阴极材料具有出色的结构完整性,空气稳定性和长周期寿命.
- 这些发现表明,这些先进的SIB阴极材料的商业应用具有重大前景.
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