纳米锗-锡/碳复合材料的合成与电化学性能研究

doi:10.3969/j.issn.1674-1951.2021.07.004

华电技术 ›› 2021, Vol. 43 ›› Issue (7): 24-29.doi: 10.3969/j.issn.1674-1951.2021.07.004

纳米锗-锡/碳复合材料的合成与电化学性能研究

乔雪, 杨雪彪, 黄婷婷, 王新月, 贾子辰, 王红强^*()

河北大学化学与环境科学学院,河北保定071002

收稿日期:2021-04-26 修回日期:2021-06-01 出版日期:2021-07-25 发布日期:2021-07-27
通讯作者: 王红强
作者简介:乔雪（1995—）,女,河北邯郸人,在读硕士研究生,从事新型储能材料和储能技术的研究工作。
杨雪彪（1995—）,男,河北张家口人,在读硕士研究生,从事负极电极材料的设计及合成研究工作。
黄婷婷（1996—）,女,河北承德人,在读硕士研究生,从事锂硫电池正极材料的合成研究工作。
王新月（1996—）,女,河北定州人,在读硕士研究生,从事无机纳米材料的合成研究工作。
贾子辰（1998—）,男,河北石家庄人,在读硕士研究生,从事电极材料电化学性能测试研究工作。
基金资助:
国家自然科学基金项目(51702079);河北大学研究生创新基金项目(hbu2020ss066)

Synthesis and electrochemical performance of nano-Ge-Sn/C composite material

QIAO Xue, YANG Xuebiao, HUANG Tingting, WANG Xinyue, JIA Zichen, WANG Hongqiang^*()

School of Chemistry and Environmental Sciences,Hebei University,Baoding 071002,China

Received:2021-04-26 Revised:2021-06-01 Online:2021-07-25 Published:2021-07-27
Contact: WANG Hongqiang

摘要/Abstract

摘要：

锗因其较高的理论容量成为最具应用前景的锂离子电池负极材料。设计制备了一种纳米锗-锡/碳复合材料,碳材料可以在提高锗导电性的同时适应其体积变化,锡的加入可以进一步提高材料导电性,并且锗和锡2种组分脱/嵌锂的电位不同,未参与反应的组分可以作为基体缓冲另一组分在充放电过程中的体积变化,提高负极的结构稳定性。通过扫描电子显微镜（SEM）、能量分散光谱仪（EDS）和X射线衍射（XRD）方法对材料进行形貌表征,并对结构和组分进行分析。将该材料作为锂离子电池负极材料,在0.50 A/g的电流密度下,首次放电容量达到1 292 （mA·h）/g,充放电100次后容量保持在510 （mA·h）/g。当电流密度提高至10.00 A/g时,仍具有460 （mA·h）/g的放电容量,说明材料具有循环稳定性的同时还有较好的倍率性能。

关键词: 锂离子电池, 锗-锡/碳负极材料, 比容量, 电流密度, 锂化反应, 倍率性能

Abstract:

Ge has become the most promising anode material for lithium-ion batteries due to its high theoretical capacity.Our team has prepared a nano-Ge-Sn/C composite material：carbon can improve the conductivity of Ge and adapt to the change in its volume,and Sn can further improve the conductivity of the material.Since the electric potentials of Ge and Sn to deintercalate/intercalate lithium ion are different,the component that does not participate in the reaction can be used as a matrix to buffer the volume change led by the other component in charge and discharge processes,which can improve the structural stability of the electrode.The morphology,structure and composition of the material were analyzed by SEM,EDS and XRD.The capacity of the lithium-ion battery taking this composite as its anode material was 1 292 （mA·h）/g in the first cycle discharge at a current density of 0.5 A/g,and remained at 510 （mA·h）/g after 100 cycles’ discharge.When the current density was increased to 10 A/g,the battery kept a capacity of 460 （mA·h）/g.It indicates a good cyclical stability and rate performance of this composite.

Key words: lithium-ion battery, Ge-Sn/C anode material, specific capacity, current density, lithiumation reaction, rate performance

中图分类号:

TK02

乔雪, 杨雪彪, 黄婷婷, 王新月, 贾子辰, 王红强. 纳米锗-锡/碳复合材料的合成与电化学性能研究[J]. 华电技术, 2021, 43(7): 24-29.

QIAO Xue, YANG Xuebiao, HUANG Tingting, WANG Xinyue, JIA Zichen, WANG Hongqiang. Synthesis and electrochemical performance of nano-Ge-Sn/C composite material[J]. Huadian Technology, 2021, 43(7): 24-29.

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材料	x（C)	x（Ge）	x（Sn）
C@Ge	83.2	16.8	0
C@GS3	86.8	13.0	0.2
C@GS10	88.7	10.7	0.6

材料	电流密度/(mA⋅g^-1)
材料	0.20	0.50	1.00	2.00	5.00	8.00	10.00
C@GS3	0.25	0.24	0.26	0.29	0.35	0.39	0.40
C@GS10	0.26	0.25	0.26	0.30	0.36	0.40	0.44
C@Ge	0.26	0.28	0.31	0.35	0.41	0.48	0.52

纳米锗-锡/碳复合材料的合成与电化学性能研究

Synthesis and electrochemical performance of nano-Ge-Sn/C composite material

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