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单晶Ni-丰富阴极的保护涂层使全固态电池的快速充电成为可能

Wengao Zhao¹, Ruizhuo Zhang¹, Fucheng Ren²

¹Battery and Electrochemistry Laboratory (BELLA), Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Kaiserstr. 12, Karlsruhe 76131, Germany.

|January 29, 2025

概括

在全固态电池 (ASSB) 中提高正极稳定性是关键. 用LiNbO3涂覆单晶正极活性材料 (CAM) 显著提高循环稳定性并抑制降解,性能优于未涂覆和多晶相应材料.

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:

阴极活性物质 (CAM) 和固体电解质 (SE) 之间的界面稳定性对于高性能全固态电池 (ASSB) 至关重要.
在阴极接口的兼容性问题和副作用带来了重大挑战.
与多晶材料相比,单晶CAM提供了更好的机械强度和电荷传输.

研究的目的:

为了增强界面稳定性和减轻ASSB中的降解.
研究LiNbO3涂层和单晶CAM形态对电池性能的联合影响.
在不同的充电条件下阐明容量衰减的机制.

主要方法:

用一个 LiNbO3 保护层涂覆半单晶 LiNi0.83Co0.12Mn0.05O2 (SC83) 颗粒.
使用 LiNbO3@SC83 CAM 和 argyrodite Li6PS5Cl SE 制造颗粒堆的 ASSB 细胞.
在1000个循环中以1C的速度进行电化学循环试验.
使用建模和物理/电化学表征来研究降解.

主要成果:

在1000个循环后,LiNbO3@SC83 ASSB显示出88%的容量保留,明显高于未涂层SC83 (71%) 和LiNbO3@PC83 (30%).
LiNbO3涂层有效地抑制了副作用,并减轻了电化学机械降解.
单晶形态在循环过程中保持结构完整性方面证明优于多晶.

结论:

单晶CAM上的LiNbO3涂层是一种高效的策略,可以提高ASSB的循环和稳定性.
该研究强调了材料组成和形态在防止电池退化方面发挥的关键作用.
容量衰减机制在快充 (机械降解) 和慢充 (接口反应) 之间有所不同.

关键词:

富含的多层氧化物阴极.电化学机械降解降解过程界面稳定性界面稳定性防护涂层是一种保护性涂层.铁酸盐是固体电解质的电解质.

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