层间 Entropy 工程 诱导对称性破碎的分层氧化物阴极激活可逆高压回氧反应
Jianhua Zhang1, Wenbin Li1, Jiayi Yang2
1Key Laboratory of Advanced Batteries Materials for Electric Vehicles of China Petroleum and Chemical Industry Federation, Institute of Advanced Electrochemical Energy & School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi, 710048, P. R. China.
这项研究介绍了分层氧化物阴极的层间工程,克服了传统兴奋剂方法的局限性. 这种新的方法提高了离子电池的性能和结构稳定性.
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
- 纳米技术纳米技术
背景情况:
- 在电极材料中,传统的兴奋剂工程面临着严格的合成,活性元素损失和晶格扭曲等挑战.
- 多层氧化物阴极对于储能至关重要,但需要提高稳定性和性能.
研究的目的:
- 提出和演示一个新的层间工程策略,用于分层氧化物阴极.
- 为了克服传统兴奋剂 Entropy 工程的局限性.
- 为了提高离子存储电极的电化学性能和结构稳定性.
主要方法:
- 使用一阶段的热水方法合成了一种新的介层中介度V2O5阴极材料 ((MnCoNiMgZn) 0.26V2O5∙0.84H2O).
- 将多个金属离子插入中间层的位置被用来诱导局部破坏对称性的[VO6]八面体.
- 对Li+储存的电化学性能,包括特定容量和容量保留,进行了评估.
主要成果:
- 层间介质效应被证明可以激活高压回氧反应,并抑制层滑动和相变.
- 设计的阴极在100个循环后以0.1 A g-1的速度实现了152 mAh g-1的放电容量.
- 对于Li+储存,在150个循环后在0.5 A g-1下观察到98.7%的优异容量保留.
结论:
- 层间工程为设计高性能分层氧化物阴极提供了一种新策略.
- 这种方法有效地平衡了特定能力和结构稳定性.
- 这些发现为开发用于储能应用的先进电极材料提供了指南.
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