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基于PC的低度阻燃电解质用于宽温度和高压离子电池

Tonghui Xu^1,2, Shengyao Luo¹, Mengqi Wu¹

¹Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Rd, Ningbo, Zhejiang Province, 315201, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|February 3, 2025

概括

甲基三甲基碳酸盐 (FEMC) 和二氧化 (LiDODFP) 能够为石墨阳极提供稳定,低度的碳酸盐 (PC) 电解质. 这克服了PC协同插入的问题,提高了电池在各种温度的性能.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
物理化学物理化学

背景情况:

碳酸 (PC) 是离子电池的一种有前途的高电流常量溶剂.
PC的应用受限于Li+与石墨阳极的协同插曲.
开发稳定,宽温度的PC电解质对于先进的电池至关重要.

研究的目的:

开发一种稳定,低度的碳酸 (PC) 基电解质用于石墨阳极.
为了解决PC和Li+在石墨上的共同插曲问题.
为了提高电解质安全性,氧化稳定性和广泛的温度性能.

主要方法:

使用甲基三甲基碳酸盐 (FEMC) 作为辅溶剂和二 (LiDODFP) 作为盐添加剂.
使用核磁共振 (NMR) 光谱来研究溶解结构.
进行理论计算以了解溶剂-电解质相互作用.
在各种温度和电压下对NCM811/石墨全电池进行了电化学循环测试.

主要成果:

在溶解中,FEMC部分替代了PC,促进了Li+溶解.
添加LiDODFP改善了Li+溶解结构和石墨的兼容性.
开发的电解质显示出异常的氧化稳定性和不易燃性.
NCM811/石墨电池显示高容量保留 (88.86%在4.5V,25°C的300个循环后) 和良好的低温性能 (-40°C).

结论:

使用FEMC和LiDODFP的新策略可以为石墨阳极提供低度PC电解质.
这种方法解决了PC协同插入的问题,提高了电池的安全性和性能.
开发的电解质适用于高压,高温和高安全的离子电池.

关键词:

石墨的协同插入是石墨的协同插入.高电压,离子电池的使用.乙烯碳酸盐是什么?温度范围广泛,温度范围广泛.

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