抑制表面合物到金属的电荷转移到稳定的高压液态COO2
Zhiqiang Yang1,2, Enyue Zhao2, Na Li2,3
1Academy for Advanced Interdisciplinary Studies & Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
ACS applied materials & interfaces
|December 29, 2023
概括
研究人员通过抑制氧氧还氧化活性,稳定了用于电子的高压氧化物 (LiCoO2). 用 (Zr4+) 兴奋剂提高了结构稳定性和电化学性能,使能量密度更高.
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:
- 为LiCoO2增加充电截止电压可以提高3C电子产品的能量密度.
- 高充电电压会触发不可逆转的氧氧回氧,导致结构不稳定,限制实际使用.
研究的目的:
- 开发一种修改策略,以抑制氧氧还氧化和增强高压LiCoO的结构稳定性.
- 通过抑制表面连接物到金属的电荷转移来抑制氧氧还原诱导的不稳定性.
主要方法:
- 将LiCoO2与Zr4+ (一种电子结构绝缘体) 合到表面晶格中.
- 使用理论计算,现场X射线吸收光谱和现场微分电化学质谱.
主要成果:
- 修改后的LiCoO2表现出抑制的氧氧氧还原活性和稳定的氧氧还原电化学.
- 实现了强大的长周期格子结构,电压衰变微不足道 (0.17 mV/周期).
- 在4.6V的100个循环后,表现出89.4%的出色容量保留.
结论:
- 通过Zr4+兴奋剂进行表面修饰,有效地抑制氧氧还原活性,并改善结构稳定性.
- 这种方法为开发稳定的高压离子存储材料提供了一种新策略,通过调节表面连接物到金属的电荷转移来开发稳定的高压离子存储材料.
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