Novel synthesis of LiFePO4–Li3V2(PO4)3 composite cathode material by aqueous precipitation and lithiation
Novel synthesis of LiFePO4–Li3V2(PO4)3 composite cathode material by aqueous precipitation and lithiation
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DOI：
10.1016/j.jpowsour.2009.11.006
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发表时间：
2010-05
影响因子：
9.2
通讯作者：
Jun‐chao Zheng;Xinhai Li;Zhixing Wang;S. Niu;De-rong Liu;Ling Wu;Lingjun Li;Jin-hui Li;
中科院分区：
文献类型：
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作者：
Jun‐chao Zheng;Xinhai Li;Zhixing Wang;S. Niu;De-rong Liu;Ling Wu;Lingjun Li;Jin-hui Li;
以Fe（NO3）3和NH 4VO 3为原料，通过水相沉淀法制备FeVO 4·xH 2 O，再以草酸为还原剂和碳源进行化学还原和锂化，合成了LiFePO 4-Li 3V 2（PO 4）3复合正极材料。用XRD、SEM和TEM对样品进行了表征。700°C下合成的化合物的XRD图谱表明橄榄石型LiFePO 4和单斜Li 3V 2（PO 4）3共存。TEM照片显示LiFePO_4-Li_3V_2（PO_4）_3颗粒被5- 10 nm厚的碳壳包裹。LiFePO 4-Li 3V 2（PO 4）3复合正极材料具有良好的电化学性能，30次循环后其0.1C放电容量为139.1，1C放电容量为135.5，3C放电容量为116 mAhg − 1。
LiFePO4–Li3V2(PO4)3composite cathode material is synthesized by aqueous precipitation of FeVO4·xH2O from Fe(NO3)3and NH4VO3, following chemical reduction and lithiation with oxalic acid as the reducer and carbon source. Samples are characterized by XRD, SEM and TEM. XRD pattern of the compound synthesized at 700°C indicates olivine-type LiFePO4and monoclinic Li3V2(PO4)3are co-existed. TEM image exhibits that LiFePO4–Li3V2(PO4)3particles are encapsulated with a carbon shell 5–10nm in thickness. The LiFePO4–Li3V2(PO4)3compound cathode shows good electrochemical performance, and its discharge capacity is about 139.1 at 0.1C, 135.5 at 1C and 116mAhg−1at 3C after 30 cycles.