Abstract:

Silicon-based anode materials have attracted a lot of interests due to their high specific capacities. In this paper, the SiOx & NG composite was measured as a high-capacity anode for lithium-ion batteries, and the effect of the SiO/C proportion on the energy density and cycle performance of full cell was investigated. The full cells with SiO/C composite in various proportions show different initial capacities and columbic efficiencies. Compared with natural graphite, SiO/C composites display a larger expansion. Moreover, the energy-density of full cell show an enhancement in a low SiO content but a gradual reduce with further increase of SiOx content, and the corresponding cycle performance of full cell decrease with the increasement of SiOx. When the proportion of SiOx is 4%, the energy density of full cell adds 1.2%, and the capacity retains over 80% after 500 cycles, which can satisfy the demands of commercial lithium ion batteries.

Key words: SiO/C composite, anode materials, cycling performance, lithium ion batteries