一步固相球磨法制备二硫化钼/石墨二维复合材料及其储锂性能

doi:10.11944/j.issn.1000-0518.2017.07.170100

摘要/Abstract

摘要：

以商品化二硫化钼(MoS₂)和石墨为原料,首次通过一步固相球磨法制备了MoS₂/石墨二维复合材料。 X射线衍射(XRD)、扫描电子显微镜(SEM)和能谱(EDS)测试结果表明,本体MoS₂和石墨在高速固相球磨过程中同时被剥离成较薄的片层,且剥离后的石墨片层均匀分散在MoS₂片层中。制备的MoS₂/石墨复合材料表现出优异的循环稳定性和倍率性能,其中,MoS₂/石墨(质量比7:3)复合材料在100 mA/g电流密度下,首圈放电比容量801 mA·h/g,充放电循环100圈后仍保持在694 mA·h/g,远优于商品化的本体MoS₂(约110 mA·h/g)。这主要归功于球磨后得到的石墨片层不仅能提高复合材料的导电性,还能有效地抑制MoS₂片层团聚,保持材料的结构稳定性。该方法简便易行、成本低,适合于高性能锂离子电池电极材料的规模化制备。

关键词: 固相球磨, 二硫化钼, 锂离子电池, 负极材料

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

谭讲, 谭希, 康文彬, 张楚虹. 一步固相球磨法制备二硫化钼/石墨二维复合材料及其储锂性能[J]. 应用化学, 2017, 34(7): 810-817.

TAN Jiang, TAN Xi, KANG Wenbin, ZHANG Chuhong. Two Dimensional Molybdenum Disulfide/Graphite Composites Prepared by Direct All-Solid-State Ball-Milling for Lithium-Ion Batteries[J]. Chinese Journal of Applied Chemistry, 2017, 34(7): 810-817.

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