一步法制备锗/MXene复合材料及其作为锂离子电池负极的研究

doi:10.15541/jim20190161

无机材料学报 ›› 2020, Vol. 35 ›› Issue (1): 105-111.DOI: 10.15541/jim20190161

所属专题： MAX相和MXene材料； 2020年能源材料论文精选(一) :金属离子电池&燃料电池； MXene材料专辑(2020~2021)；【虚拟专辑】锂离子电池(2020~2021)

一步法制备锗/MXene复合材料及其作为锂离子电池负极的研究

郭丝霖^1,²,康帅^1,²(),陆文强^1,²

^1. 中国科学院重庆绿色智能技术研究院, 重庆 400714
^2. 中国科学院大学, 重庆 400714

收稿日期:2019-04-18 修回日期:2019-07-19 出版日期:2020-01-20 网络出版日期:2019-09-12
作者简介:郭丝霖(1995-), 女, 硕士研究生. E-mail:guosilin@cigit.ac.cn
基金资助:
中国科学院青年创新促进会(2019374);中国科学院重庆绿色智能技术研究院青年创新基金(Y82A240H10);重庆市留学归国人员创新创业支持计划(cx2018152)

Ge Nanoparticles in MXene Sheets: One-step Synthesis and Highly Improved Electrochemical Property in Lithium-ion Batteries

GUO Si-Lin^1,²,KANG Shuai^1,²(),LU Wen-Qiang^1,²

^1. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
^2. University of Chinese Academy of Sciences, Chongqing 400714, China

Received:2019-04-18 Revised:2019-07-19 Published:2020-01-20 Online:2019-09-12
About author:GUO Si-Lin (1995-), female, Master candidate. E-mail:guosilin@cigit.ac.cn
Supported by:
Youth Innovation Promotion Association of the Chinese Academy of Sciences(2019374);CCIGIT Young Innovators Awards(Y82A240H10);Chongqing Innovators Program for Returned Overseas Scholars(cx2018152)

摘要/Abstract

摘要：

通过化学溶液法一步制备锗/MXene复合材料, 在MXene表面均匀负载了锗金属纳米颗粒。采用SEM和TEM对Ge/MXene复合材料进行了微观形貌分析, 探索了复合材料的形成过程, 结果表明, Ge/MXene复合材料是二维结构形貌, 其元素分布均一。用Ge/MXene复合材料制备了电极, 并组装成纽扣电池进行充放电性能测试, 对电池的比容量、倍率、循环稳定性能进行了系统分析。测试结果表明, Ge含量为50%时的电化学性能最佳, 0.2C下第5~100圈的容量稳定在1200 mAh/g, 载量为1 mg/cm ²; 载量提高到2 mg/cm ²时的比容量依然能达到450 mAh/g。

关键词: MXene, 锗纳米颗粒, 锂离子电池, 负极材料

Abstract:

Ge nanoparticles were synthesized uniformly on MXene sheets via a one-step chemical solution method. Morphology of Ge/MXene was characterized by SEM and TEM. Formation process and optimized synthesis condition was analyzed carefully. Ge/MXene was used as anode for lithium-ion batteries. Their electrochemical performances, including capacity, rate and cycling stability, were tested and evaluated. Ge/MXene exhibited a greatly improved capacity of 1200 mAh/g during the first hundred cycles at 0.2C with a loading of 1 mg/cm ². A capacity of 450 mAh/g at a higher loading of 2 mg/cm ² was obtained after 100 cycles. The excellence in electrochemistry is attributed to the high conductivity of MXene and its accommodable interlayer space.

Key words: MXene, Ge nanoparticles, lithium-ion batteries, anode materials

中图分类号:

TQ174

郭丝霖, 康帅, 陆文强. 一步法制备锗/MXene复合材料及其作为锂离子电池负极的研究[J]. 无机材料学报, 2020, 35(1): 105-111.

GUO Si-Lin, KANG Shuai, LU Wen-Qiang. Ge Nanoparticles in MXene Sheets: One-step Synthesis and Highly Improved Electrochemical Property in Lithium-ion Batteries[J]. Journal of Inorganic Materials, 2020, 35(1): 105-111.

图/表 7

图1 MAX(黑色)、MXene(红色)和Ge/MXene(蓝色)的XRD图谱

Fig. 1 XRD patterns of MAX (black), MXene (red) and Ge/MXene (blue)

图2 Ge/MXene的SEM照片 (a) Low-magnification; (b) High-magnification

Fig. 2 SEM images of Ge/MXene

图3 Ge/MXene 形貌分析(a~c)Ge/MXene的TEM照片; (b)低倍TEM照片, 图中的箭头指向明显的MXene片层; (c)高倍TEM照片, Ge颗粒被薄层碳包裹; (d)Ge/MXene的HADDF照片, 以及(e)C、(f)Ti和(g)Ge的EDS面分布图

Fig. 3 Morphology with analysis of Ge/MXene (a-c) TEM image of Ge/MXene; (b) Low magnification TEM image, the arrows points to typical MXene layers; (c) High magnification TEM image and thin carbon layer around Ge nanoparticle; (d) HADDF image of Ge/MXene; EDS mappings of (e) C, (f) Ti and (g) Ge

图4 不同退火时间制备的Ge/MXene的(a)XRD图谱和(b~f)TEM照片

Fig. 4 XRD patterns (a) of Ge/MXene with different annealing time and their TEM images (b-c) 0.5 h; (d-e) 1.5 h; (f) 3 h. Peaks marked with solid circles are from MXene and with cross are from Ge

图5 (a)Ge/MXene在不同倍率下的充放电曲线; 不同Ge含量的(b)倍率性能和 (c)交流阻抗图谱; 不同Ge含量的循环稳定性能(d)50wt%和(e)75wt%

Fig. 5 (a) Charge-discharge curves of Ge/MXene at different rate; (b) Rate performance, (c) EIS curves, and cycling performance of Ge/MXene with different Ge content ((d) 50wt% and (e) 75wt%)

图6 不同载量的Ge/MXene的循环稳定性能

Fig. 6 Cycling performance of Ge/MXene with different loadings

图7 不同退火时间的Ge/MXene的循环稳定性能

Fig. 7 Cycling performance of Ge/MXene with different annealing time

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一步法制备锗/MXene复合材料及其作为锂离子电池负极的研究

Ge Nanoparticles in MXene Sheets: One-step Synthesis and Highly Improved Electrochemical Property in Lithium-ion Batteries

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