刘学武.金属铁掺杂的LiMnPO4/C制备研究及电化学性能[J].稀有金属材料与工程,2016,45(1):207~211.[liuxuewu.Electrochemical performance Research of Fe ion doped LiMnPO4/C[J].Rare Metal Materials and Engineering,2016,45(1):207~211.]
金属铁掺杂的LiMnPO4/C制备研究及电化学性能
投稿时间:2014-02-20  修订日期:2015-02-10
中文关键词:  磷酸锰锂/C  固相反应  铁离子掺杂  酚醛树脂
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目);大连市科技项目
中文摘要:
      采用固相法,在LiMnPO4晶格中引入铁离子合成LiFexMn1-xPO4/C固溶体提高其电化学性能,以酚醛树脂作为还原剂和碳源,通过确定Fe和Mn比例来优化材料的电化学性能。合成的LiFexMn1-xPO4/C颗粒均具有相似的类球形形貌,颗粒尺寸300~500nm,分布均匀。研究结果表明,材料电化学性能、可逆容量及倍率性能随Mn含量的增加而减小,Fe2 /Fe3 和Mn3 /Mn2 的氧化还原电位随之发生变化。通过充放电测试LiFexMn1-xPO4/C电化学性能可知,当x=0.5、600℃煅烧10h合成的LiFe0.5Mn0.5PO4/C样品具有较好的电化学性能:0.1C放电容量147.3mAh/g;2C倍率下循环100圈后,放电容量从115.2mAh/g降为112.7mAh/g,容量保持率为97.8%,材料在该倍率下能很好地发挥其电化学性能;10C倍率经过200圈循环后,容量保持率仍有89.6%。
Electrochemical performance Research of Fe ion doped LiMnPO4/C
英文关键词:LiMnPO4/C  solid-state reaction  Fe ion doped  phenolic resin
英文摘要:
      Using solid-state method, a solid solution of LiFexMn1-xPO4 is generated as introducing iron into crystalline LiMnPO4 for electrochemical property improvement, and phenolic resin is added as the reducing agent and carbon sources. The Fe-to-Mn ratio that affects the electrochemical performance is also investigated, and the optimized ratio is determined. The synthesized samples have similar spherical morphology with particle size of 300~500nm, and are uniformly distributed. The results show that the electrochemical performance of LiFexMn1-xPO4 decreases continuously with increasing Mn content. The oxidation and reduction of Fe2 /Fe3 and Mn3 /Mn2 shift accordingly. The electrochemical performance by charge-discharge measurement shows: when x=0.5, the LiFe0.5Mn0.5PO4/C sample calcined at 600℃ for 10h has better performance, exhibits 147.3mAh/g at 0.1C, after 100 cycles, the discharge capacity of 115.2mAh/g becomes 112.7mAh/g, the capacity retention rate is 97.8%, illustrating well expressing its electrochemical performance at 2C. At high rate, like 10C, the capacity retention rate is 89.6% after 200 cycles.
作者单位E-mail
刘学武 大连理工大学 liuxuewu@dlut.edu.cn 
摘要点击次数: 43
全文下载次数: 46
查看全文  查看/发表评论  
关闭