通过接口扩散爬行实现的几乎无应变的阳极架构,用于初始无阳极准固态电池
Kwang Hee Kim1, Myung-Jin Lee2, Minje Ryu1
1Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.
Nature communications
|April 27, 2024
概括
使用酸纳米管和银碳中间层的无阳极电池在涂层过程中减少了应变. 这一创新使得稳定,高能量密度的固态电池具有出色的循环性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 无阳极固态电池提供高能量密度,但在涂/脱落过程中遭受内部应变.
- 固体电解质接口上的这种应变限制了循环寿命和实际应用.
研究的目的:
- 为无阳极固态电池制定减压策略.
- 为了提高石榴石型固态电解质的稳定性和循环性.
主要方法:
- 使用酸纳米管架构作为中间层.
- 包含一个银碳中间层来管理压力.
- 制造了一种含有LLZTO电解质和高压NMC阴极的准固态电池.
主要成果:
- 酸纳米管中间层通过界面扩散爬行来适应沉积,与铜阳极相比,抑制体积膨胀10倍.
- 在化过程中实现了近乎无应变的操作.
- 整个细胞在1 mA cm-2下表现出超过600个周期,在室温下具有99.8%的平均库伦比效率.
结论:
- 新的层间架构有效地减轻了无阳极固态电池的界面应变.
- 这种方法显著提高了石榴型固态电池的循环和稳定性,为更安全,高能量密度的储能铺平了道路.
相关概念视频
01:11P-N junction
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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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01:16Biasing of P-N Junction
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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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