元素度和晶体架构的双梯度工程使高性能丰富的层状氧化物阴极成为可能
Guihong Mao1, Jieyu Yang1, Tengyu Yao1
1Jiangsu Key Laboratory of Materials and Technologies for Energy Storage, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
ACS nano
|January 14, 2026
概括
工程双梯度阴极与提高高能离子电池的稳定性和性能. 这一突破提高了循环寿命和高速率的功能,用于先进的能源存储.
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:
- 富含的层状氧化物是高能离子电池的关键.
- 高含量导致循环过程中的结构不稳定性和容量衰减.
- 接口降解和晶格应力限制电池性能.
研究的目的:
- 为丰富的阴极开发一个双梯度的架构.
- 为了提高结构稳定性和电化学性能.
- 为了解决高能离子电池容量衰减的问题.
主要方法:
- 在球形粒子内设计的辐射 (Ge) 度梯度.
- 实现了连贯的相位演变,从无序的岩盐到旋转到分层的配置.
- 研究了Ge兴奋剂对Li+扩散和界面反应的影响.
主要成果:
- 双梯度架构显著改善了Li+扩散动力学.
- 通过调节Ni氧化状态来抑制界面寄生反应.
- 证明了非凡的循环稳定性,在1C的200个循环后保持97.0%的容量.
- 在高速率条件下 (4.3 V,10 C) 实现了171.4 mAh g-1的放电容量.
结论:
- 双梯度策略有效地稳定了富含Ni的多层氧化物阴极.
- 一致的相位过渡可以最大限度地减少晶体学不匹配和异性压力.
- 这种方法为高速率,长寿命的离子电池提供了一个有希望的途径.
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