摘要
硅基负极材料因其较高的比容量而受到研究者广泛的关注。本文选取高比容量SiO_x与NG复合材料作为锂离子电池负极材料,研究了不同SiO/C复合比例对全电池的能量密度和循环性能的影响。不同比例SiO_x/C复合材料的首次容量和首次效率有明显差别。与石墨材料相比,SiO_x/C复合材料的膨胀程度略有增加。随着SiO_x比例的增加,全电池的能量密度先是上升然后下降,但其循环稳定性却有所降低。当SiO_x比例在4%时,全电池能量密度提升4.2%,500周循环后容量保持率在80%以上,可以满足商业化锂离子电池的使用要求。
Silicon-based anode materials have attracted a lot of interests due to their high specific capacities. In this paper, the SiOx/NG composite was investigated as a high-capacity anode material for lithium-ion batteries, and the effect of the SiO/C proportion on the energy density and cycle performance of the full cell was investigated. Full cells with SiO/C composite in various proportions show different initial capacities and columbic efficiencies. Compared with natural graphite, SiO/C composites show a larger expansion. Moreover, the energy-density of the full cell show an enhancement with low SiO content but a gradual decreasing while further increase the SiOx content. The cycle performance of full cells decreases with the increasement of SiOx. When the proportion of SiOx is 4%, a full cell gains 1.2% increasement in the energy density and the capacity retains over 80% after 500 cycles, which can satisfy the demands of commercial lithium ion batteries.
出处
《储能科学与技术》
CAS
2016年第4期522-526,共5页
Energy Storage Science and Technology
