Mass-scalable synthesis of 3D porous germanium-carbon composite particles as an ultra-high rate anode for lithium ion batteries

被引:213
作者
Duc Tung Ngo [1 ]
Le, Hang T. T. [1 ]
Kim, Chanhoon [2 ]
Lee, Jae-Young [1 ]
Fisher, John G. [1 ]
Kim, Il-Doo [2 ]
Park, Chan-Jin [1 ]
机构
[1] Chonnam Natl Univ, Dept Mat Sci & Engn, Kwangju 500757, South Korea
[2] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea
基金
新加坡国家研究基金会;
关键词
ENERGY-STORAGE; HIGH-CAPACITY; NEGATIVE ELECTRODES; SILICON ANODES; RAMAN-SPECTRA; PERFORMANCE; GE; NANOWIRES; GRAPHENE; NANOSTRUCTURES;
D O I
10.1039/c5ee02183a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Electrode materials with three-dimensional (3D) mesoporous structures possess superior features, such as a shortened solid-phase lithium diffusion distance, a large pore volume, full lithium ion accessibility, and a high specific area, which can facilitate fast lithium ion transport and electron transfer between solid/electrolyte interfaces. In this work, we introduce a facile synthesis route for the preparation of a 3D nanoarchitecture of Ge coated with carbon (3D-Ge/C) via a carbothermal reduction method in an inert atmosphere. 3D-Ge/C showed excellent cyclability: almost 86.8% capacity retention, corresponding to a charge capacity of 1216 mA h g(-1) even after 1000 cycles at a 2C-rate. Surprisingly, the high average reversible capacity of 1122 mA h g(-1) was maintained at a high charge rate of 100C (160 A g(-1)). Even at an ultrahigh charge rate of 400C (640 A g(-1)), an average capacity of 429 mA h g(-1) was attained. Further, the full cell composed of a 3D-Ge/C anode and an LiCoO2 cathode exhibited excellent rate capability and cyclability with 94.7% capacity retention over 50 cycles. 3D-Ge/C, which offers a high energy density like batteries as well as a high power density like supercapacitors, is expected to be used in a wide range of electrochemical devices.
引用
收藏
页码:3577 / 3588
页数:12
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