双元替换诱导的集成缺陷结构,以抑制富Mn基阴极的电压衰变和容量色
Zhigui Zhang1, Pengzu Kou1, Yu Chen1
1School of Materials Science and Engineering, Northeastern University, Shenyang 110819, PR China; School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, PR China.
Journal of colloid and interface science
|August 17, 2024
概括
用Sn4+/Na+对富含的基氧化物 (LRMO) 进行双元素兴奋剂,会产生增强电池性能的缺陷结构. 这一策略显著提高了循环稳定性,并减少了下一代离子电池的电压衰减.
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
- 电池技术 电池技术
背景情况:
- 丰富的基氧化物 (LRMO) 为下一代离子电池提供高能量密度.
- 商业化受到电压衰减和容量衰减问题的阻碍.
研究的目的:
- 制定一种策略,以抑制电压衰减,并提高LRMO的循环性能.
- 调查Sn4+/Na+联合兴奋剂和诱导缺陷结构对LRMO稳定性的影响.
主要方法:
- 与Sn4+和Na+一起配合LRMO以创建集成的缺陷结构.
- 氧气空缺,堆叠断层和表面旋转相的表征.
- 电化学性能测试,包括循环稳定性和电压衰变分析.
主要成果:
- 集成的缺陷结构有效地抑制电压衰减 (小于1.5mV/周期).
- 修改后的NSO-1样本显示出极好的循环性能 (207 mAh/g,100个循环后96.71%的保留率).
- Sn4+/Na+联合兴奋剂稳定了分层结构并增强了Li+扩散.
结论:
- 双元替换诱导的表面缺陷工程是改进LRMO阴极材料的有价值的策略.
- 拟议的方法有效地解决了离子电池容量衰减和电压衰减的问题.
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