通过对离子电池的双位置换,以阳离子为基础的分层氧化物阴极具有高电化学性能
Panya Thanwisai1, Songge Yang1, Zeyi Yao1
1Department of Mechanical and Materials Engineering, Worcester Polytechnic Institute, Worcester, MA, 01609, USA.
Small (Weinheim an der Bergstrasse, Germany)
|February 6, 2025
概括
研究人员使用Al和Zn替代增强了离子电池阴极,提高了稳定性和能量密度. 这种双站式策略可以提高先进电池应用的性能.
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:
- 带有阴离子氧化解氧的分层氧化物阴极为离子电池 (SIB) 提供高能量密度.
- 不稳定性和不良的电化学稳定性阻碍了这些SIB阴极的实际应用.
研究的目的:
- 为了提高SIBs的富含Mn的分层氧化物阴极的电化学性能.
- 研究Al和Zn双位置换对阴极稳定性和能量密度的影响.
主要方法:
- 一种新型的Al和Zn共同替代的分层氧化物阴极 (Na0.73Zn0.03Li0.25Mn0.76Al0.01O2) 的合成和表征.
- 电化学测试,包括放电能力,速率能力和循环稳定性.
- 采用硬碳阳极和先进材料特性来理解性能改进的全细胞组件.
主要成果:
- 该AlZn阴极实现了242mAh高放电容量g-1和出色的速率能力 (162mAhg-1在1000mAg-1).
- 阴极表现出优异的容量保留 (89.69%超过150个周期).
- 一个全细胞SIB表现出 317 Wh kg-1 的高能量密度和 250 个循环后 80.8% 的容量保留.
结论:
- 和双位置换有效地提高了Mn丰富的多层氧化物阴极的电化学稳定性和能量密度.
- Al-O和O-Zn-O键的协同效应减轻了相位转换和裂纹,从而提高了性能.
- 这一战略为开发高能离子电池提供了一个有前途的途径.
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