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Updated: Jun 21, 2025

The Effect of Charging and Discharging Lithium Iron Phosphate-graphite Cells at Different Temperatures on Degradation

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Published on: July 18, 2018

温度响应型形成循环使丰富的阴极-电解质相间循环成为可能.

Luxi Hong¹, Yi Zhang¹, Pan Mei¹

¹Innovation Center for Chemical Science, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China.

Angewandte Chemie (International ed. in English)

|July 15, 2024

概括

此摘要是机器生成的。

使用低温形成循环的无添加剂策略可以为先进的宽温度电池创建富含LiF的阴极电解质介相 (CEI). 这种方法提高了高温循环性和低温性能,没有副作用.

关键词:

富含LiF的CEI地区外热反应是一种外热反应.形成循环的形成循环.低温低温的低温是一个问题.

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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:

对于需要在各种热条件下运行的应用程序,广泛温度电池性能至关重要.
形成一个富含LiF的阴极电解质介面 (CEI) 是可取的,以实现稳定的宽温度电池运行.
使用化添加剂形成富含LiF的CEI的传统方法通常会导致不必要的副作用.

研究的目的:

制定一个无添加剂的战略,以创造一个富含LiF的CEI.
通过低温循环研究LiF丰富CEI形成的机制.
为了评估这个CEI对电池性能在广泛的温度范围内的影响.

主要方法:

在-5°C的低温形成循环使用LiNi_0.33Mn_0.33Co_0.33O₂作为模型阴极.
使用确定LiF含量的技术,对CEI成分进行表征.
在不同温度 (-20°C至60°C) 下进行电化学测试,以评估电池性能.
理论模拟以了解潜在的化学机制.

主要成果:

低温循环在-5°C显著提高了CEI中的LiF含量 (~17.7%) 与25°C形成 (2.7%) 相比.
该机制涉及LiPF₆在低温下在带正电荷的阴极表面上的自发和外热分解.
电池表现出更好的高温 (60°C) 循环性和在-20°C (3°C速率) 时100%的容量增强.
该策略已成功扩展到其他阴极材料 (LiNi_0.8Mn_0.1Co_0.1O₂,LiCoO₂,LiMn₂O₄) 中.

结论:

无添加剂,低温形成循环是创建富含LiF的CEI的有效策略.
这种方法克服了传统方法的局限性,避免了副作用,并提高了电池的稳定性.
开发的方法提供了一种多功能途径,可以提高宽温度电池的性能.