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长成长的晶格连贯表面使高压LiCoO2阴极具有卓越的机械完整性
Xiang Li1, Kexin Wang1, Miao Tian1
1National University of Singapore, Chemistry, SINGAPORE.
Angewandte Chemie (International ed. in English)
|May 14, 2025
概括
高压氧化 (LiCoO2) 阴极发生不稳定. 一种新的表面工程方法创造了耐用的丰富层,增强了结构完整性,并使4.6-4.7V的稳定运行成为可能.
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
- 固态化学 固态化学
背景情况:
- 高能量密度的阴极对于先进的电池至关重要.
- 氧化 (LiCoO2) 在4.55V以上的高压操作导致结构和接口不稳定.
- 这种不稳定性导致机械故障和显著的容量下降.
研究的目的:
- 为了提高高压LiCoO2.2的结构和界面稳定性.
- 为了使LiCoO2在4.6V及以上电压下稳定运行.
- 探索表面工程作为提高LiCoO2性能的战略.
主要方法:
- 使用热驱动元件间扩散来创建表面修饰.
- 在LiCoO2表面上长出一个同含丰富的相.
- 修改后的LiCoO2的结构完整性和电化学性能得到了评估.
主要成果:
- 在LiCoO2表面上成功生长了一种高度耐用的,与格子连贯的丰富相.
- 不良副作用,不可逆转的相位过渡和晶格氧气损失被显著抑制.
- 经过修改的LiCoO2表现出极好的循环稳定性和在4.6V和4.7V的额外容量.
结论:
- 通过丰富相的表轴生长进行表面工程,有效地提高了高压LiCoO2.2的机械完整性.
- 这种方法减轻了降解途径,使得稳定的高压运行成为可能.
- 开发的表面修改策略为下一代高能量密度阴极材料提供了一个有前途的途径.
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