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

doi:10.12028/j.issn.2095-4239.2016.0015

Abstract

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

PAN Guanghong, ZHAO Yongbin, ZHANG Kaizhou, KANG Libin, TANG Kun . High power soft/hard carbon composite anode for rechargeable lithium-ion battery[J]. Energy Storage Science and Technology, 2017, 6(1): 94-100.

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