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一种基于异质Co-MnO@NC的多功能二次电池,用于深度诱导的沉积和化物在Li─S电池中的转化

Kaiquan He¹, Hangqi Yang¹, Xiaowei Wu¹

¹School of Materials Science and Engineering & Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Wuhan Institute of Technology, Wuhan, 430205, China.

Small (Weinheim an der Bergstrasse, Germany)

|July 6, 2024

概括

一种新型添加碳涂层的-氧化物 (Co-MnO@NC) 介层有效抑制-硫 (Li-S) 电池中的聚硫化物穿. 这种先进的材料提高了容量保留和循环稳定性,为高性能电池设计铺平了道路.

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:

导电碳基介层是自溶式电池系统中至关重要的二次电流收集器,捕获阴极材料并使深度容量释放成为可能.
这些中间层对聚硫化物的稳定性是抑制硫 (Li-S) 电池中穿效应的关键.

研究的目的:

开发一种具有双催化中心的功能性介层材料,以提高Li-S电池的性能.
为了研究添加碳 (NC) 和双金属Co-MnO异质连接在缓解聚硫化物转运中的协同效应.

主要方法:

一个经过修改的金属有机框架 (Mn-ZIF67) 用于合成化碳涂层异质Co-MnO (Co-MnO@NC) 材料.
该Co-MnO@NC材料被集成为一个具有聚烯 (PP) 分离器的Li-S电池系统中的功能中间层.
评估了电化学性能,包括初始容量,循环稳定性和高硫负载下的性能.

主要成果:

在Co-MnO@NC介层中,自由聚硫化物和碎片化活性硫的快速沉积和转化得到了证明.
使用Co-MnO@NC/PP分离器的Li-S电池在3°C时实现了1050 mAhg-1的初始容量,低容量衰变率为0.056%.
在苛刻的条件下 (5.82 mg cm−2 S负荷),电池在0.2 C的200个循环后保持了501.36 mAh g−1的可逆容量,表明了实际可靠性.

结论:

在Co-MnO@NC间层中NC和Co-MnO的协同合有效地减少了Li-S电池的容量损失.
开发的双金属异质连接催化剂在高性能Li-S电池中的二次电流收集器方面取得了重大进展.
这项工作为设计各种自溶式电池系统中的介层提供了宝贵的指导.

关键词:

Li-S 电池的使用情况.双金属异质连接双金属异质连接这里是中间层的中间层.二级电流采集器是什么穿效应的穿效应

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