氮化碳包覆LiNi0.9Co0.05Mn0.05O2正极用于高能量密度和长寿命锂电池

被引：0

作者：

段振亮 ^{[1
,2
]}

邱祥云 ^{[3
]}

郭向欣 ^{[1
]}

机构：

[1] 青岛大学物理科学学院

[2] 青岛大学材料科学与工程学院

[3] 青岛大学机电工程学院

来源：

电池工业 | 2024年 / 03期

基金：

国家重点研发计划;

关键词：

锂离子电池; 高镍三元正极; 二维材料g-C3N4; 包覆;

D O I：

暂无

中图分类号：

TM912 [蓄电池]; TB34 [功能材料];

学科分类号：

080501 ;

摘要：

高容量的富镍层状氧化物是二次锂基电池系统中很有前途的正极材料。然而，其较差的离子导电性和电极/电解液界面处的副反应导致其倍率和循环性能不理想。本文利用离子导电率优异的二维材料g-C3N4对富镍材料LiNi0.9Co0.05Mn0.05O2实现均匀包覆，包覆层g-C3N4可有效抑制富镍材料寿命过程中的结构退化和晶间裂纹，并阻止活性材料与电解液的直接接触，从而稳定电极/电解液界面，防止副反应的发生。此外，g-C3N4的包覆增强了表观锂离子扩散系数方面的锂脱/嵌动力学，所合成的包覆材料在3～4.5 V、1 C下循环200次后的容量高达175.2 mAh/g,而在5 C下仍能获得154.3 mAh/g的可逆容量，大大优于未包覆材料性能表现。本研究为构建具有优异综合性能的高镍三元金属氧化物正极超薄界面层提供了新思路。

引用

页码：142 / 149

页数：8

共 24 条

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