Novel synthesis of LiCoPO4–Li3V2(PO4)3 composite cathode material for Li-ion batteries
Novel synthesis of LiCoPO4–Li3V2(PO4)3 composite cathode material for Li-ion batteries
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DOI：
10.1016/j.matlet.2015.03.116
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发表时间：
2015-08
影响因子：
3
通讯作者：
Ling Wu;Shaonan Shi;Xiaoping Zhang;Jie-qun Liu;Dong Chen;Haoming Ding;Shengkui Zhong
中科院分区：
文献类型：
--
作者：
Ling Wu;Shaonan Shi;Xiaoping Zhang;Jie-qun Liu;Dong Chen;Haoming Ding;Shengkui Zhong
以Co 3V 2 O 8为前驱体，草酸为还原剂，采用化学锂化法合成了LiCoPO 4-Li 3V 2（PO 4）3复合正极材料。XRD结果表明，复合材料由橄榄石型LiCoPO 4和单斜相Li 3V 2（PO 4）3组成。TEM、HRTEM和FFT结果表明，LiCoPO 4-Li 3V 2（PO 4）3颗粒被纳米碳网包裹，晶体颗粒中含有LiCoPO 4和Li 3V 2（PO 4）3的晶格条纹和衍射斑点。复合材料显示出阶梯式充放电平台，其中包含LiCoPO 4（~4.8 V）和Li 3V 2（PO 4）3（~3.6、3.7、4.1和4.5 V）的电位平台。在3.0-5.0 V的电位范围内，该复合材料在0.05、0.5和2 C倍率下的比容量分别为163.7、133.6和93.8 mA h g− 1，并显示出良好的循环性能。
LiCoPO4–Li3V2(PO4)3composite cathode material is synthesized by a chemical lithiation method, with Co3V2O8as the precursor and oxalic acid as the reductant. XRD result indicates that the composite is composed of olivine-type LiCoPO4and monoclinic Li3V2(PO4)3. TEM, HRTEM and FFT results show that the LiCoPO4–Li3V2(PO4)3particles are wrapped with nano-carbon webs, and the crystal particles contain the lattice fringes and diffraction spots of LiCoPO4and Li3V2(PO4)3. The composite shows the stepped charge–discharge platforms which contain the potential plateaus of LiCoPO4(~4.8 V) and Li3V2(PO4)3(~3.6, 3.7, 4.1 and 4.5 V). During the potential range of 3.0–5.0 V, the composite delivers the specific capacities of 163.7, 133.6 and 93.8 mA h g−1at 0.05, 0.5 and 2 C rates, respectively, and shows good cycling performance.