固相法制备单晶LiSn_2(PO_4)_3锂离子电池负极

Synthesis of Rhombohedral Structure LiSn_2(PO_4)_3 Single Crystalline as Anode Material for Lithium-ion Battery

采用高温固相法合成了可用于锂离子电池负极的斜六方晶系的单晶LiSn_2(PO_4)_3.通过XRD和TEM手段确定了LiSn_2(PO_4)_3的斜六方晶系单晶结构,SEM手段观察得出LiSn_2(PO_4)_3粒径为200-300 nm.相比锡基氧化物纳米颗粒,斜六方晶系的单晶LiSn_2(PO_4)_3电极在充放电过程容量保持率更高.电化学性能测试结果表明,电极在100 m A g-1恒电流密度充放电时,LiSn_2(PO_4)_3电极充放电循环50次后容量保持为301.4 m A h g-1,远高于Sn O2纳米颗粒电极.

Rhombohedral structure LiSn2（PO4）3was fabricated by solid-state method and applied in anode material of lithium-ion battery. The rhombohedral structure was confirmed by XRD and TEM technique. The morphology of LiSn2（PO4）3particle was investigated by SEM method. Compared with Sn O2nano-particle electrode, LiSn2（PO4）3electrode exhibits better cycling performance and rate capacity. When the electrode was charged/discharged at current density of 100 m A/g, LiSn2（PO4）3electrode could retain 301.4m Ah/g after 50 cycles while Sn O2nano-particle electrode was not much left.