Surface modification of graphite by ion implantation for promoting the electrochemical property in Li-ion batteries

被引：29

作者：

Hai, Yang ^{[1
,2
]}

Cui, Wei ^{[1
,2
]}

Lin, Yemao ^{[1
]}

Han, Pei ^{[1
]}

Chen, Huaican ^{[4
]}

Zhu, Zhiyong ^{[5
]}

Li, Cuihua ^{[1
]}

Yang, Bo ^{[1
]}

Zhu, Caizhen ^{[1
]}

Xu, Jian ^{[1
,3
]}

机构：

[1] Shenzhen Univ, Coll Chem & Environm Engn, Inst Low Dimens Mat Genome Initiat, Shenzhen 518060, Guangdong, Peoples R China

[2] Dongguan Univ Technol DGUT, Sch Mech Engn, Dongguan, Guangdong, Peoples R China

[3] Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China

[4] Chinese Acad Sci, CSNS, IHEP, Guangzhou 523803, Guangdong, Peoples R China

[5] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2019年 / 484卷

基金：

中国国家自然科学基金;

关键词：

Lithium ion battery; Volumetric capacity; Surface modification; Ion implantation; Graphite; LITHIUM BATTERIES; ANODE MATERIALS; DOPED GRAPHENE; CARBON;

D O I：

10.1016/j.apsusc.2019.04.081

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nowadays, graphite is still the commercial anode material for Li-ion batteries although many kinds of anode materials have been reported. A great deal of efforts has been devoting to improving the specific gravimetric capacity of graphite by doping or preparing hierarchical structure. However, the volumetric capacity of graphite is not taken seriously compared to the specific gravimetric capacity. In this paper, a surface modification method, ion implantation, has been put forward to improve the volumetric capacity of graphite with high coulombic efficiency. After modification with 50 keV N+ ions at 1 x 10(12) ions/cm(2), the volumetric capacity of implanted graphite increases 29.6% (696 mAh/cm(3)) compared to that of pure graphite electrode (537 mAh/cm(3)) with a super-high initial coulombic efficiency of similar to 95.9%. Moreover, the influence of nitrogen doping and vacancies induced by N+ ions implantation on the improving of volumetric capacity is discussed. The implanted effects of graphite are also observed by HRTEM, GIXRD, Raman and XPS.

引用

页码：726 / 731

页数：6

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