储能科学与技术 ›› 2017, Vol. 6 ›› Issue (1): 94-100.doi: 10.12028/j.issn.2095-4239.2016.0015

• 研究开发 • 上一篇    下一篇

高功率锂离子电池软/硬复合碳负极材料

潘广宏，赵永彬，张开周，康利斌，唐  堃   

  1. 北京低碳清洁能源研究所，北京 102209
  • 收稿日期:2016-05-05 修回日期:2016-06-12 出版日期:2017-01-03 发布日期:2017-01-03
  • 通讯作者: 潘广宏（1984—），女，硕士研究生，研究方向为储能材料，E-mail：panguanghong@nicenergy.com。
  • 作者简介:潘广宏（1984—），女，硕士研究生，研究方向为储能材料，E-mail：panguanghong@nicenergy.com。
  • 基金资助:
    分布式能源系统中锂离子电池储能模块产品开发（神华集团项目）（ST930015SH04）。

High power soft/hard carbon composite anode for rechargeable lithium-ion battery

PAN Guanghong, ZHAO Yongbin, ZHANG Kaizhou, KANG Libin, TANG Kun   

  1. National Institute of Clean-and-Low-Carbon Energy, Beijing 102209, China
  • Received:2016-05-05 Revised:2016-06-12 Online:2017-01-03 Published:2017-01-03

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1196

被引次数

3

摘要： 为了满足储能市场对高功率电池的需求，开发具有高功率性能的锂离子电池负极材料成为必然发展趋势。本文通过湿式合成法将软碳和硬碳的前驱体进行复合，开发了一种新型的复合碳锂离子电池负极材料。考察了其克比容量、库仑效率、倍率性能以及循环稳定性。用X射线粉末衍射（XRD）、拉曼、扫描电镜（SEM）以及透射电子显微镜（TEM）对所制备的复合碳材料的结构和表面形貌进行表征。结果表明，该复合碳材料同时具有软碳和硬碳的优点，且性能优于机械混合碳，在保持高比容量和高效率的前提下，倍率性能尤为突出，其2C容量可达154 mA·h/g，且2C/0.2C的容量保持率为64.2%；同时0.2C克比容量为240 mA·h/g，库仑效率为82%。经过5C充放电后，恢复0.2C小电流充放电后，容量保持率达99.8%，循环稳定性很好。XRD、拉曼以及透射电子显微镜的表征结果均表明软、硬碳在复合过程中不只是简单机械共混而是具有协同效应。

关键词: 软碳, 硬碳, 复合碳, 比容量, 库仑效率, 倍率

Abstract: In order to satisfy the requirement of distributed storage system for high power applications, developing a new high power anode materiel for lithium-ion batteries is necessary. In this paper, a novel carbon composite material was developed through compositing soft with hard carbon precursors using wet synthesis method. The capacity, coulombic efficiency, rate capability and cycle stability were investigated. The structures of the prepared materials were characterized by the techniques of X-ray diffraction (XRD), Raman, Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM). It has been found that the composite carbon has both soft and hard carbon’s advantage, and better performance than mechanical mixing carbon with the same ratio. Its excellent rate capability were tested at 2C charge/discharge rates between the potential limit of 0—3.0 V, its 2C capacity can reach 154 mA·h/g and the 2C/0.2C capacity retention is 64.3%, at the meantime, it delivers a 0.2C capacity of 240 mA·h/g, and the initial coulombic efficiency of 82%. The composite carbon is stable for its 0.2C capacity retention can reach 99.8% after 5C charge-discharge. There is some kind of synergistic effect between soft carbon and hard carbon during the compositing process, not just simple mechanical mixing, which was confirmed by XRD, Raman, and TEM.

Key words: soft carbon, hard carbon, carbon composite, capacity, coulombic efficiency, rate