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缓解结构崩的多晶LiNiCoMn_1-O₂通过表面 Co 丰富

Mingjie Shang¹, Hengyu Ren¹, Wenguang Zhao¹

¹School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, China.

|June 20, 2024

概括

表面丰富策略稳定了多晶,,,氧化物 (NCM) 阴极,防止粒子碎片化,并使高压应用成为可能. 这提高了电池的性能和寿命.

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:

多晶,,和氧化 (NCM) 阴极在高电压 (>4.4V与Li/Li+) 时面临结构崩和降解.
表面降解和颗粒碎裂限制了NCM材料的电化学性能和循环寿命.

研究的目的:

开发NCM阴极的表面修改策略,以提高它们的结构稳定性和在高电压下电化学性能.
研究表面修饰减轻颗粒碎裂并改善循环寿命的机制.

主要方法:

使用表面丰富策略,制造丰富的NCM (C-NCM).
在充电过程中,在现场形成了坚固的表面岩盐 (RS) 层.
使用C-NCM/石墨硬币电池评估了电化学性能.

主要成果:

C-NCM阴极呈现出稳定的表面RS层,促进Li+通过表面而不是谷物边界迁移.
这种稳定接口有效地抑制了氧气损失,过渡金属溶解和副作用.
C-NCM/石墨电池在0.2C时显示出205.1mAhg-1的高可逆容量,并在1C时500个周期后保持86%的容量.

结论:

表面丰富和现场RS层形成是提高NCM阴极结构完整性的有效策略.
稳定接口显著提高了基于NCM的离子电池的高压性能,循环寿命和安全性.
这种方法为开发用于高能量密度应用的先进NCM阴极材料提供了有希望的途径.

关键词:

LiNixCoyMn1−x−yO2 的时间谷物边界的谷物边界粒子碎片化粒子碎片化岩盐层是一种岩盐层.结构崩结构崩

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