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高能离子电池硬碳阳极的扩展平原容量

Xiaohao Ji¹, Yunhong Wei², Haizhao Yang¹

¹School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|July 20, 2024

概括

研究人员为先进的离子电池 (LIB) 开发了高性能硬碳微球 (HCM). 这些材料提供了增强的容量和快速充电能力,提高了能量密度和低温性能.

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:

硬碳材料对离子存储具有前景,但在离子存储方面面临挑战,特别是在调整影响能量密度的高化高原容量方面.
在离子电池 (LIB) 中实现高能量密度需要优化电极材料以有效地容纳离子存储.

研究的目的:

为LIBs开发高性能硬碳微球 (HCM),以扩展低压高原容量.
在定制硬碳结构中阐明储存机制.
为了证明优化HCM在全电池中的潜力,用于快速充电和低温应用.

主要方法:

从交联的多糖体中合成硬碳微球 (HCM).
现场拉曼定性和现场核磁共振光谱,以调查储存机制.
半电池和全电池中HCM的电化学测试 (HCM下载下载LiCoO2),包括速率能力,循环稳定性和低温性能.

主要成果:

优化的HCM呈现出较低的缺陷含量,丰富的石墨微晶结构和较低的特定表面积,促进了快速的储存.
HCM显示了高可逆容量537mAhg-1的显著低压高原容量比率为55%和高初始库伦比效率.
完整电池的能量密度为393Wh kg-1 ,快速充电能力 (80%在4分钟内在10°C),在-40°C下保持80%的容量.

结论:

该研究成功建立了一种生产具有增强储存性能的HCM的方法.
确定了"吸附-间歇机制",为高容量硬碳的合理设计策略提供了洞察力.
开发的HCM显示出下一代高能量密度和快速充电LIB的巨大潜力,包括在低温下运行的LIB.

关键词:

硬碳微球是硬碳的微球.高能量密度,高能量密度.离子电池的离子电池低压高原容量低压高原容量

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