Carbon-coated graphite for anode of lithium ion rechargeable batteries: Carbon coating conditions and precursors
Carbon-coated graphite for anode of lithium ion rechargeable batteries: Carbon coating conditions and precursors
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DOI：
10.1016/j.jpowsour.2009.05.040
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发表时间：
2009-10-20
影响因子：
9.2
通讯作者：
Inagaki, Michio
中科院分区：
文献类型：
--
作者：
Nozaki, Hidehiko;Nagaoka, Katsuhide;Inagaki, Michio
将天然石墨与不同的碳前驱体在100 g左右的尺度上进行机械混合，对天然石墨颗粒进行碳包覆。用碳包覆石墨研究了锂离子可充电电池的负极性能。石墨颗粒上形成的碳具有非晶结构和低密度。通过碳包覆，在EC/PC = 3/1的电解质溶液中，第一次充放电循环的不可逆容量下降。放电容量无明显变化。不同前驱体的碳对碳包覆石墨的阳极性能没有明显的影响。在700 ~ 1000℃的温度下，以4 ~ 13%质量%的质量为碳包覆的最佳工艺条件，将天然石墨与粉末中的碳前驱体进行机械混合，是制备锂离子充电电池负极材料碳包覆石墨的简单而又充分的工艺。作为碳前驱体，聚乙烯醇被证明是值得重视的碳前驱体之一。(C) 2009 Elsevier B.V.版权所有
Carbon coating of natural graphite particles was performed by mechanical mixing of natural graphite with different carbon precursors in a scale of about 100 g. Anode performance in lithium ion rechargeable batteries was studied on the resultant carbon-coated graphite. Carbon formed on graphite particles had amorphous structure and low density. By carbon coating, a decrease in irreversible capacity of the first charge/discharge cycle in an electrolyte solution of EC/PC = 3/1 was observed. without noticeable change in discharge capacity. Carbon derived from different precursors did not give any marked difference in anode performance of carbon-coated graphite. Optimum conditions for carbon coating were determined as the coating of 4-13 mass% at 700-1000 degrees C. The present mechanical mixing of natural graphite and carbon precursor in powder is concluded to be a simple but sufficient process to produce carbon-coated graphite for anode material in lithium ion rechargeable batteries. As carbon precursor, PVA was shown to be one of the appreciable carbon precursors. (C) 2009 Elsevier B.V. All rights reserved.