喷雾闪速热分解法制备LiCoPO_4工艺
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摘要
以锂盐、钴盐、磷酸盐为原料,以柠檬酸为碳源,采用喷雾闪速分解法制备锂离子电池正极材料LiCoPO_4粉体.研究前驱体溶液体系、喷雾闪速热分解温度、前驱体溶液浓度、热处理温度对锂离子电池正极材料LiCoPO_4粉体结构组分和微观形貌的影响.粉体结构组分和微观形貌通过XRD、SEM表征.结果表明:采用硝酸盐体系、选择前驱体浓度0.2mol/L、闪速热分解温度400℃、热处理温度600℃、热处理时间6h,可得到晶型完整、粒度分布均匀的实心球体LiCoPO_4.
Taking lithium and cobalt salt and nitrate as raw materials and citric acid as carbon source,the lithium ion battery anode material,LiCoPO_4 powder,was prepared by spray flash decomposition method.The effects of precursor solution system,spray flash decomposition temperature,precursor solution concentration,heat treatment temperature on the structural composition and microstructural morphology of LiCoPO_4 powder were investigated and the powder was characterized with XRD and SEM.The results indicated that to get solid spheric LiCoPO_4 cells with complete crystal forms and uniform distribution of crystalline size,the raw material should be nitrate system,the precursor concentration was 0.2mol/L,flash decomposition temperature was 400 ℃,heat treatment temperature was 600 ℃ and heat treatment time was 6hours.
Taking lithium and cobalt salt and nitrate as raw materials and citric acid as carbon source,the lithium ion battery anode material,LiCoPO_4 powder,was prepared by spray flash decomposition method.The effects of precursor solution system,spray flash decomposition temperature,precursor solution concentration,heat treatment temperature on the structural composition and microstructural morphology of LiCoPO_4 powder were investigated and the powder was characterized with XRD and SEM.The results indicated that to get solid spheric LiCoPO_4 cells with complete crystal forms and uniform distribution of crystalline size,the raw material should be nitrate system,the precursor concentration was 0.2mol/L,flash decomposition temperature was 400 ℃,heat treatment temperature was 600 ℃ and heat treatment time was 6hours.
引文
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[8]LI H H,JIN J,WEI J P,et al.Fast synthesis of core-shell LiCoPO4/C nanocomposite via microwave heating and its electrochemical Li intercalation performances[J].Electrochemistey Communications,2009,11(3):95-98.
[2]栗欢欢,杨晓亮,魏进平,等.锰离子掺杂对LiCoPO4性能的影响[J].电化学,2008,14(2):210-212.
[3]汪燕鸣,王啊鸣,王振西.锂离子电池5V正极材料LiCoPO4/C的合成与性能[J].淮北师范大学学报:自然科学版,2011,32(1):50-52.
[4]刘晓红,邹美捷,许春晓,等.溶液-凝胶法制LiCoPO4及其掺碳材料的电化学性能[J].南昌大学学报:工科版,2011,33(1):12-16.
[5]GANGULIBAU D,BHUVANESWARI N,KALAISELVIN,et al.CAM sol-gel synthesized LiMPO4(M=Co,Ni)cathodes for rechargeable lithium batteries[J].J Sol-Gel Sci Technol,2009,49(3):137-144.
[6]WOLFENSTINE J,LEE U,POESE B,et al.Effect of oxygen partial pressure on the discharge capacity of LiCoPO4[J].Power Sources,2005,144(1):226-230.
[7]BRAMNIK N N,BRAMNIK K G,BUHRMESTER T,et al.Electrochemical and structural study of LiCoPO4-based electrodes[J].J Solid State Electrochem,2004,8(2):564-588.
[8]LI H H,JIN J,WEI J P,et al.Fast synthesis of core-shell LiCoPO4/C nanocomposite via microwave heating and its electrochemical Li intercalation performances[J].Electrochemistey Communications,2009,11(3):95-98.