用抗氧化剂亚酸构建的阴极-电解质接口引导LNMO在高压条件下实现稳定循环
Yang Shen1, Jianhua Huang1, Yang Mao1
1School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China.
ACS applied materials & interfaces
|December 10, 2024
概括
亚酸 (AA) 添加到,,氧化物 (LNMO) 阴极材料中,可以防止电解质分解. 这稳定了电池接口,显著改善了离子电池 (LIB) 的循环性能和容量保留.
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:
- LiNi0.5Mn1.5O4 (LNMO) 是高能量密度离子电池 (LIB) 的一个有前途的阴极材料.
- 自由基诱导的电解质分解严重限制了基于LNMO的LIBs的稳定性和性能.
研究的目的:
- 为了研究 Askorbic 酸 (AA) 作为功能添加剂的有效性,以减轻 LNMO 阴极中的电解质分解.
- 为了提高基于LNMO的LIBs的电化学稳定性和循环性能.
主要方法:
- 在LNMO阴极的电极制造过程中加入酸 (AA).
- 液晶半电池的电化学测试,包括在1°C下对1000个循环进行循环性能评估.
- 用AA添加剂与PVDF等传统结合剂的电池性能比较.
主要成果:
- 亚酸有效地终止了自由基的连锁反应,防止了严重的电解质分解.
- 使用AA添加剂的LNMO水晶半电池在1C下1000个循环后表现出87.4%的高容量保留率.
- 这显著超过了仅使用PVDF粘合剂观察到的43.6%的保留率.
结论:
- 亚酸是一种高效且简单的功能添加剂,用于稳定基于LNMO的LIB中的阴极-电解质接口 (CEI).
- 该战略提供了一种经济可行的方法,以提高高能量密度LIBs的电化学性能和长期稳定性.
相关概念视频
02:47Voltaic/Galvanic Cells
56.8K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
56.8K
03:00Electrolysis
26.0K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.0K
01:25MOS Capacitor
707
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
707
03:12Batteries and Fuel Cells
27.0K
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...
27.0K