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首页> 外文期刊>Journal of power sources >Electrochemical characteristics of needle coke refined by molten caustic leaching as an anode material for a lithium-ion battery
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Electrochemical characteristics of needle coke refined by molten caustic leaching as an anode material for a lithium-ion battery

机译：熔融苛性浸出精制的针状焦的电化学特性，作为锂离子电池的负极材料

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摘要

Needle coke, the remaining material after refining petroleum, is used as an anode of a lithium-ion secondary battery. Sulfur is separated from the needle coke to below 0.1 wt. percent using the molten caustic leaching (MCL) method developed at the Korea Institute of Energy Research. The needle coke with high-purity is carbonized at various temperatures, namely 0, 500, 700 and 900 deg C. The coke treated at 700 deg C gives a first and second discharge capacity of more than 560 and 460 mAh g~(1), respectively, between 0 and 2.0 V. By contrast, the first and second discharge capacity of untreated coke is over 420 and 340 mAh g~(1), respectively, between 0.05 and 2.0 V.The first discharge capacity of 560 mAh g~(1) is beyond the theoretical maximum capacity of 372 mAh g~(1)for LiC_6. Though the cycle efficiency is not consistent, the needle coke heat-treated at 700 deg C persistently maintains an efficiency of over 90 percent until the 50th cycle, except on the first cycle. This study demonstrates that the needle coke with high-purity could be a good candidate for an anode material in fabricating high-capacity lithium-ion secondary batteries.
机译：针状焦炭是石油精制后的剩余材料，被用作锂离子二次电池的阳极。硫从针状焦中分离至低于0.1重量％。使用韩国能源研究所开发的熔融苛性浸出（MCL）方法的百分比。高纯度的针状焦炭在0、500、700和900摄氏度的各种温度下碳化。在700摄氏度下处理的焦炭的第一和第二放电容量超过560和460 mAh g〜（1）分别在0至2.0 V之间。未处理焦炭的第一和第二放电容量分别在420和340 mAh g〜（1）之间，分别在0.05至2.0 V之间。第一放电容量为560 mAh g〜 （1）超出了LiC_6的理论最大容量372 mAh g〜（1）。尽管循环效率不一致，但在第50个循环之前（在第一个循环中除外），在700℃下进行热处理的针状焦一直保持90％以上的效率。这项研究表明，高纯度的针状焦炭可能是制造高容量锂离子二次电池负极材料的良好选择。

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