废旧电池再生磷酸铁锂正极的钛掺杂改性研究

详细信息    查看全文 | 推荐本文 |

英文篇名：Performance of titanium-doped LiFePO_4 recycled from spent batteries 作者：黄河 ; 赵光金 ; 付希凡 ; 蒲想军 ; 陈重学 英文作者：HUANG He;ZHAO Guang-jin;FU Xi-fan;PU Xiang-jun;CHEN Zhong-xue;Key Laboratory of Hydraulic Machinery Transients of Ministry of Education, School of Power and Mechanical Engineering, Wuhan University;Laboratory for Grid Waste Treatment and Resource Recycle Technology, State Grid, State Grid Electric Power Research Institute; 关键词：废旧电池 ; 磷酸铁锂 ; 再生正极 ; 钛掺杂 ; 电化学性能 英文关键词：spent batteries;;lithium iron phosphate;;regenerated cathode;;Ti doping;;electrochemical performance 中文刊名：DYJS 英文刊名：Chinese Journal of Power Sources 机构：武汉大学动力与机械学院水力机械过渡过程教育部重点实验室;国网河南省电力公司电力科学研究院电网废弃物资源化处理技术实验室; 出版日期：2019-05-20 出版单位：电源技术 年：2019 期：v.43;No.344 基金：国家电网公司出资项目(521702160004) 语种：中文; 页：DYJS201905019 页数：3 CN：05 ISSN：12-1126/TM 分类号：57-59

摘要

对废旧锂离子电池再生磷酸铁锂正极材料,采用钛元素进行掺杂改性。用X射线衍射仪和扫描电镜分析不同掺杂量对材料物相结构和形貌的影响。用恒电流充放电、循环伏安和交流阻抗等方法测试材料电化学性能。与未掺杂的再生LiFePO_4/C相比,掺杂5%Ti的LiFePO_4/C(LFT5P/C)材料电荷传递阻抗减小,电化学性能明显提高。掺杂正极在0.1 C下首次放电比容量高达140.6 mAh/g,1 C倍率下循环近400次,每次的容量衰减率仅为0.019 6%。
        The regenerated lithium iron phosphate(LiFePO_4) from spent lithium ion batteries was modified by Ti doping. X-ray diffraction and scanning electron microscope were used to investigate the effect of doping amounts on the structure and morphology of doped products. Galvanostatic charge/discharge test, cyclic voltammetry, and electrochemical impedance spectrum were employed to study the electrochemical performance of the as-prepared cathodes. Compared with pristine LiFePO_4/C, doped cathodes exhibits decreased charge-transfer resistance and evidently enhanced electrochemical performance. Specifically, the doped cathode LFT5P/C delivers a high initial discharge specific capacity of 140.6 mAh/g at 0.1 C, and the capacity decay is only 0.019 6% per cycle when the cathode is cycled at 1 C for nearly 400 cycles.

引文

[1]中国储能网.2013年或成为锂电池市场拐点[EB/OL].[2013-01-24].http://www.escn.com.cn/2013/0124/778633.html.
    [2]曹利娜,宫璐,刘成士,等.废旧锂离子电池回收技术研究进展[J]电源技术,2015,39(9):2014-2016.
    [3]杨秋菊,赵世超,王楠,等.废旧动力锂离子电池中磷酸铁锂的再生[J].电池,2014,44(1):60-62.
    [4]BIAN D C,SUN Y H,LI S,et al.A novel process to recycle spent LiFePO4for synthesizing LiFePO4/C hierarchical microflowers[J].Electrochim Acta,2016,190:134-140.
    [5]陈江平,宋大卫,宋继顺,等.废旧磷酸铁锂电池中的正极材料的绿色回收和高效利用[C]//第31届全国化学与物理电源学术年会论文集.天津:全国化学与物理电源学术年会,2015.
    [6]SONG X,HU T,LIANG C,et al.Direct regeneration of cathode materials from spent lithium iron phosphate batteries using a solid phase sintering method[J].RSC Adv,2017,7(8):4783-4790.
    [7]LI X L,ZHANG J,SONG D W,et al.Direct regeneration of recycled cathode material mixture from scrapped LiFePO4batteries[J].JPower Sources,2017,345:78-84.