在基阴极中采用K扩展和Ni/Ti压缩的双重策略,以稳定存储
Zhengyang Li1, Yuting Chen1, Zhiyuan Guo1
1School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Small (Weinheim an der Bergstrasse, Germany)
|November 11, 2025
概括
这项研究引入了一种用于离子电池的新型富含的阴极,P2-K0.7Mn0.8Ni0.1Ti0.1O2 (KMNT),通过抑制降解机制来提高稳定性和性能.
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:
- 离子电池的基氧化物阴极因Mn3+和Mn2+溶解而遭受不可逆转的降解.
- 在化/脱过程中的循环应变进一步加剧了阴极的不稳定性.
研究的目的:
- 为离子电池开发一种稳定,高性能,富含的正极.
- 通过双重监管策略来解决Mn3+和Jahn-Teller扭曲和Mn2+溶解的问题.
主要方法:
- 一个P2-K0.7Mn0.8Ni0.1Ti0.1O2 (KMNT) 阴极材料的合成.
- 使用K+支柱进行金属层扩张和Ni/Ti联合兴奋剂来压缩过渡金属层.
- 电化学测试,包括循环性能,速率能力和操作分析.
主要成果:
- 由于增强的Mn−O相互作用,KMNT阴极表现出高的平均放电电压≈2.6V (vs. Na+/Na).
- 在1°C时表现出124mAhg-1的可逆特定容量,具有优异的容量保留 (98%在200次循环后,83%在10°C时900次循环后).
- 操作测试证实了动态的K+/Na+交换机制,以及没有Mn2+形成.
结论:
- 双调节策略有效地抑制了Mn3+ Jahn-Teller扭曲和Mn2+溶解,从而提高了阴极稳定性.
- KMNT阴极代表了丰富的阴极材料在离子电池中的重大进步.
- 建立了设计稳定和高性能基阴极的新范式.
更多相关视频
相关概念视频
Batteries and Fuel Cells
30.7K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
30.7K
Formation of Complex Ions
25.6K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
25.6K
Electrodeposition
1.2K
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
1.2K


