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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

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)

【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 m Ah/g,载量为1 mg/cm2;载量提高到2 mg/cm2时的比容量依然能达到450 m Ah/g。

【关键词】 MXene;锗纳米颗粒;锂离子电池;负极材料;

【DOI】

【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-Lin1,2 KANG Shuai1,2 LU Wen-Qiang1,2

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

【Abstract】Ge nanoparticles were synthesized uniformly on MXene sheets via a one-step chemical solution method. The morphology of Ge/MXene was characterized by SEM and TEM. The formation process and optimized synthesis condition were analyzed carefully. Ge/MXene was used as anode for lithium-ion batteries. Their electrochemical performance, including capacity, rate and cycling stability, were tested and evaluated. Ge/MXene exhibited a greatly improved capacity of 1 200 mAh/g during the first hundred cycles at 0.2C with a loading of 1 mg/cm2. A capacity of 450 mAh/g at a higher loading of 2 mg/cm2 was obtained after 100 cycles. The excellence in electrochemistry was attributed to the high conductivity of MXene and its accommodable interlayer space.

【Keywords】 MXene; Ge nanoparticles; lithium-ion batteries; anode materials;

【DOI】

【Funds】 Youth Innovation Promotion Association of the Chinese Academy of Sciences (2019374); CCIGIT Young Innovators Awards (Y82A240H10); Chongqing Innovators Program for Returned Overseas Scholars (cx2018152);

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This Article

ISSN:1000-324X

CN: 31-1363/TQ

Vol 35, No. 01, Pages 105-111

January 2020

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Article Outline

Abstract

  • 1 Experimental method
  • 2 Results and analysis
  • 3 Conclusion
  • References