磷酸钴锂电极材料的合成与电化学性能
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摘要
制备了磷酸钴锂以及Fe掺杂磷酸钴锂电极材料,并考察了它们的电化学性能。采用纳米球磨技术以及喷雾干燥工艺获得样品前驱体,并通过高温煅烧等手段获得了磷酸钴锂及Fe掺杂磷酸钴锂电极材料。利用X射线衍射、扫描电镜以及电化学分析仪等表征手段对材料物相、晶粒形貌和尺寸进行了表征分析和性能测试。研究结果表明,煅烧温度对制备的LiCoPO_4材料的形貌和电化学性能测试有很大的影响。实验获得的纯相LiCoPO_4材料的电化学性能并不理想,而通过掺杂Fe取代Co化学位得到的LiCoPO_4的初始容量和循环性能更好,电化学性能得到了很好的提升。
In this paper, LiCoPO_4 and Fe doped LiCoPO_4 electrode materials were prepared and their electrochemical performance were investigated. By using nano ball-milling technology and spray drying to obtain precursor first, and then through high temperature calcination to get LiCoPO_4 and Fe doped LiCoPO_4 electrode materials. Using XRD, SEM and electrochemical analyzer for their phase, grain morphology and size to do characterization analysis and performance test. The results showed that the calcination temperature has a great influence on the morphology and the electrochemical performance of LiCoPO_4 materials. The electrochemical performance of pure phase LiCoPO_4 was not ideal, but the initial capacity and cycle performance by doping of Fe element into LiCoPO_4 lattice was much better, showing a certain promotion of electrochemical performance.
In this paper, LiCoPO_4 and Fe doped LiCoPO_4 electrode materials were prepared and their electrochemical performance were investigated. By using nano ball-milling technology and spray drying to obtain precursor first, and then through high temperature calcination to get LiCoPO_4 and Fe doped LiCoPO_4 electrode materials. Using XRD, SEM and electrochemical analyzer for their phase, grain morphology and size to do characterization analysis and performance test. The results showed that the calcination temperature has a great influence on the morphology and the electrochemical performance of LiCoPO_4 materials. The electrochemical performance of pure phase LiCoPO_4 was not ideal, but the initial capacity and cycle performance by doping of Fe element into LiCoPO_4 lattice was much better, showing a certain promotion of electrochemical performance.
引文
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[3]Cho Y D,Fey G T K,Kao H M.能量储存与转移-碳涂层厚度对Li Fe PO4/C复合物阴极容量的影响[J].Journal of Power Sources,2009,189(1):256-262.
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[6]邹美捷,刘晓红,许春晓,等.锂离子电池正极材料Li Co PO4的研究现状和展望[J].广东化工,2009(11):71-72.
[7]Wolfenstine J,Lee,U.Poese B.Effect of oxygen partial pressure on the discharge capacity of Li Co PO4[J].Journal of Power Sources,2005,144:226-230.
[8]Bramnik N.N,Bramnik G.Electrochemical and structural study of Li Co PO4-based electrodes[J].Solid State Electrochem,2004(8):558.
[9]钟胜奎,尹周澜,王志兴,等.低温固相反应合成Li3V2(PO4)3正极材料及其性能[J].无机化学学报,2006,22(10):1843-1846.
[2]A K Padhi,K S Nanjundaswamy and J B Goodenough.Pho-sphoolivines as positive-electrode materials for rechargeable li-thium batteries[J].Journal of the Electrochemical Society,1997,144(4):1188-1194.
[3]Cho Y D,Fey G T K,Kao H M.能量储存与转移-碳涂层厚度对Li Fe PO4/C复合物阴极容量的影响[J].Journal of Power Sources,2009,189(1):256-262.
[4]Yonemura M,Yamada A,Takei Y,et al.Comparative kinetic study of olivine Lix MPO4(M=Fe,Mn)[J].Journal of the Electrochemical Society,2004,151(9):A1352-A1356.
[5]Wolfenstine J,Allen J.Ni3+/Ni2+redox potential in Li Ni PO4[J].Journal of Power Sources,2005,142(1-2):389-390.
[6]邹美捷,刘晓红,许春晓,等.锂离子电池正极材料Li Co PO4的研究现状和展望[J].广东化工,2009(11):71-72.
[7]Wolfenstine J,Lee,U.Poese B.Effect of oxygen partial pressure on the discharge capacity of Li Co PO4[J].Journal of Power Sources,2005,144:226-230.
[8]Bramnik N.N,Bramnik G.Electrochemical and structural study of Li Co PO4-based electrodes[J].Solid State Electrochem,2004(8):558.
[9]钟胜奎,尹周澜,王志兴,等.低温固相反应合成Li3V2(PO4)3正极材料及其性能[J].无机化学学报,2006,22(10):1843-1846.