以NH4H2PO4、Li2CO3和V2O5为原料,采用微波法快速合成了锂离子电池正极材料Li3V2(PO4)3.考察了微波功率、加热时间及产品中的理论碳含量对材料物理及电化学性能的影响.添加的乙炔黑具有还原剂、微波吸收体及导电剂的多重作用.XRD测试表明采用该法可以获得单相的Li3V2(PO4)3.电化学测试表明含2%C的Li3V2(PO4)3具有较好的充放电性能,充放电电流密度为7 mA·g-1时,首次放电比容量为115.7 mAh·g-1,20次循环后容量保持率为87.5%.与传统方法相比,微波法具有工艺简单,效率高,经济性好的优点.
This paper reports a microwave irradiation method to rapidly and easily synthesize Li3V2(PO4)3 with NH4H2PO4, V2O5 and Li2CO3 as raw materials. Influences of microwave power, heating time and content of carbon (theoretically in products) on physical and electrochemical properties of Li3V2(PO4)3 were researched. Acetylene black added to raw materials played important roles of reductant, microwave absorber and conductive substance. Single phase Li3V2(PO4)3 was determined by XRD in this experiment. Electrochemical tests show that materials with 2%C gave the best charge/discharge performance and the initial discharge capacity is 115.7 mAh·g-1 at current of 7 mA·g-1. The capacity retention was 87.5% after 20 cycles. Microwave irradiation method is simple, more efficient and more economical than conventional methods.
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