废锂离子电池中失效钴酸锂材料超声再生

发布时间：2019-07-18 20:23

【摘要】：为了恢复锂离子电池中正极钴酸锂材料的电化学活性,对置于LiOH溶液中的失效钴酸锂进行超声再生研究。采用XRD和Raman光谱分析钴酸锂晶体结构,采用SEM分析钴酸锂表面形貌和颗粒大小,采用FT-IR光谱仪和TGA热分析仪分析钴酸锂表面粘附的有机物。结果表明:超声空化效应可以有效地去除钴酸锂表面的有机物,并有利于钴酸锂晶体在LiOH溶液中Co和Li阳离子的重排。室温条件下,失效的钴酸锂在2.0 mol/L LiOH溶液中经过12 h超声处理后,成功恢复了其电化学活性。锂离子电池的首次充电容量为132.2 mA·h/g,首次放电容量为131.9 mA·h/g,第50次循环时的电容保持率为97.2%。
[Abstract]:In order to restore the electrochemical activity of cathode lithium cobalt in lithium ion batteries, ultrasonic regeneration of failed lithium cobalt in LiOH solution was studied. The crystal structure of lithium cobalt was analyzed by XRD and Raman, the surface morphology and particle size of lithium cobalt were analyzed by SEM, and the organic compounds adhered to the surface of lithium cobalt were analyzed by FT-IR spectrometer and TGA thermal analyzer. The results show that the ultrasonic cavitation effect can effectively remove the organic matter on the surface of lithium cobalt acid and is beneficial to the rearrangement of Co and Li cations in LiOH solution. At room temperature, the failed lithium cobalt acid was successfully restored to its electrochemical activity after 12 h ultrasonic treatment in 2.0 mol/L LiOH solution. The first charging capacity of lithium-ion battery is 132.2 mA 路h / g, the first discharge capacity is 131.9 mA 路h / g, and the capacitance retention rate is 97.2% at the 50th cycle.
【作者单位】：安徽建筑大学环境与能源工程学院;同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室;上海第二工业大学上海电子废弃物资源化产学研合作开发中心;
【基金】：安徽省自然基金面上项目(1408085ME88) 国家自然科学基金面上项目(51078286) 安徽建筑大学博士基金(2013n人才引进-05) 电子废弃物资源化产学研合作开发中心开放基金(ZF1224-04)
【分类号】：TM912

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