过渡金属氧化物阴极中的双位多可以使离子电池具有高压稳定性
Lijue Yan1, Weixin Chen2, Hehe Zhang3
1Department of Chemistry, Zhejiang University, Hangzhou, 310027, China.
Small (Weinheim an der Bergstrasse, Germany)
|May 28, 2024
概括
这项研究开发了一种用于离子电池的新阴极材料,使用双位点兴奋剂. 该材料显示了增强的结构稳定性和高电压的高容量,提高了电池的性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 高压阴极材料对于提高离子电池的能量密度和安全性至关重要.
- 在高压下结构稳定性仍然是当前阴极设计的关键挑战.
研究的目的:
- 设计和研究一种新的P2-Na0.73K0.03Ni0.23Li0.1Mn0.67O2 (KLi-NaNMO) 阴极材料.
- 通过双部位协同作用的兴奋剂来增强结构稳定性和电化学性能.
主要方法:
- 理论计算和实验研究被结合在一起.
- 使用 (K) 和 (Li) 在 (Na) 和过渡金属 (TM) 层中的双位点兴奋剂.
- 评估了电化学性能,包括容量和循环稳定性.
主要成果:
- 兴奋剂加强了Ni (3d) 和O (2p) 轨道的重叠,调节相变,并使同步的Ni和O氧化还原.
- 基因兴奋剂改善了结构稳定性,抑制了TM溶解,并促进了4.4V的单相过渡.
- KLi-NaNMO实现了高容量 (105-120 mAh g-1) 和超过300个周期在4.2-4.4V.
结论:
- 双位点兴奋剂是开发高性能离子电池阴极的有效策略.
- 在高压应用中,KLi-NaNMO阴极表现出优异的结构完整性和电化学性能.
- 这项工作提供了对电子和晶体结构调制的见解,以改善能量存储.
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