Abstract:

Two dimensional flaky composites of MoS₂/graphite are first prepared via direct all-solid-state ball-milling using commercial molybdenum disulfide(MoS₂) and graphite as raw materials. As evidenced from X-ray difraction, scanning electron microscopy and energy dispersive spectrometry, MoS₂ and graphite are exfoliated into thin sheets, which entangle uniformly alleviating the agglomeration of MoS₂. Thus as-prepared MoS₂/graphite composites exhibit significantly improved cycling stability and rate capability. When tested at the current density of 100 mA/g, MoS₂/graphite(mass ratio 7:3) composite shows an initial specific discharge capacity of 801 mA·h/g and retains a reversible specific capacity of 694 mA·h/g after 100 cycles, which is much superior to that of bulk MoS₂(about 110 mA·h/g remained after 100 cycles). The outstanding electrochemical performance of ball-milled MoS₂/graphite composites could be attributed to following reasons:exfoliated graphite sheets not only improve the electrical conductivity of MoS₂/graphite composite, but also prevent the agglomeration of MoS₂ during the charge/discharge process, which enhances structural stability of the composite electrode. In addition, the technique reported herein also demonstrates a facile and low-cost method for the production of high performance lithium ion battery electrode materials on a large scale.

Key words: all-solid-state ball-milling, molybdenum disulfide, lithium ion battery, anode material