溶剂热法合成纳米磷酸钴锰锂正极材料及其电化学性能研究
|
摘要
采用溶剂热法合成了纳米尺寸棒状磷酸钴锰锂(LiCo_(1-x)Mn_xPO_4,x=0.1,0.2,0.3,0.4,0.5)锂离子电池固溶体正极材料。研究了锰(Mn)含量对磷酸钴锂(LiCoPO_4)晶体结构、颗粒尺寸和电化学行为的影响。研究结果表明:随固溶体中Mn含量的增加,材料颗粒尺寸逐渐减小,充放电容量逐渐升高,在Mn含量为0.5%(wt,质量分数)条件下制得的磷酸钴锰锂/碳(LiCo_(0.5)Mn_(0.5)PO_4/C)表现出最好的电化学性能,在0.1C、1.0C倍率下的放电容量分别达到137、118mAh/g,具有较好的倍率充放电性能。
LiCo_(1-x)Mn_xPO_4(x=0.1,0.2,0.3,0.4,0.5)nanorodes as anode material for lithium ion battery was synthesized by a solvothermal method.The effect of Mn content on crystalline structure,particle size and electrochemical behavior of LiCoPO_4 were investigated.The test results indicated that the particle size gradually decreased and the reversible capacity gradually increased with rising Mn content.The LiCo_(0.5)Mn_(0.5)PO_4/C synthesized with Mn content of 0.5 wt% showed the highest electrochemical activity and delivered the discharge capacity of137 mAh/g and 118 mAh/g at 0.1 Cand 1.0 C,respectively,illustrating good rate charge/discharge performance.
LiCo_(1-x)Mn_xPO_4(x=0.1,0.2,0.3,0.4,0.5)nanorodes as anode material for lithium ion battery was synthesized by a solvothermal method.The effect of Mn content on crystalline structure,particle size and electrochemical behavior of LiCoPO_4 were investigated.The test results indicated that the particle size gradually decreased and the reversible capacity gradually increased with rising Mn content.The LiCo_(0.5)Mn_(0.5)PO_4/C synthesized with Mn content of 0.5 wt% showed the highest electrochemical activity and delivered the discharge capacity of137 mAh/g and 118 mAh/g at 0.1 Cand 1.0 C,respectively,illustrating good rate charge/discharge performance.
引文
[1]Wu B,Xu H,Mu D,et al.Controlled solvothermal synthesis and electrochemical performance of LiCoPO4submicron single crystals as a cathode material for lithium ion batteries[J].J Power Sources,2016,304:181-188.
[2]Han Y H,Ni J F,Liu J Z,et al.Improving electrochemical performance of LiCoPO4via Mn substitution[J].Mater Technol,2013,28(5):265-269.
[3]Fang L,Zhang H,Zhang Y,et al.Design and synthesis of twodimensional porous Fe-doped LiCoPO4 nano-plates as improved cathode for lithium ion batteries[J].J Power Sources,2016,312:101-108.
[4]Li H,Wang Y,Yang X,et al.Improved electrochemical performance of 5V LiCoPO4cathode materials via yttrium doping[J].Solid State Ionics,2014,255:84-88.
[5]汪燕鸣,朱波,刘晓玉,等.磷化钴对高电压正极材料电化学性能的影响[J].化工新型材料,2017,45(2):76-78.
[6]Li H,Li Yun,Chen L,et al.Microwave assisted synthesis of core-shell LiFe1/3 Mn1/3Co1/3PO4/C nanocomposite cathode for high-performance lithium-ion batteries[J].J Alloy Comp,2014,617:154-159.
[7]Yang S M G,Aravindan V,Cho W I,et al.Realizing the performance of LiCoPO4cathodes by Fe substitution with offStoichiometry[J].J Electrochem Soc,2012,159(7):A1013-A1018.
[8]Allen J L,Thompson Travis,Sakamoto Jeff,et al.Transport properties of LiCoPO4 and Fe-substituted LiCoPO4[J].J Power Sources,2014,254:204-208.
[9]Ni J F,Han Y,Liu J,et al.Improving electrochemical properties of LiCoPO4 by Mn substitution:a case research on LiCo0.5Mn0.5PO4[J].ECS Electrochem Lett,2013,2(2):A3-A5.
[10]Ni J,Han Y,Gao L,et al.One-pot synthesis of CNT-wired LiCo0.5Mn0.5PO4 nanocomposites[J].Electrochem Commun,2013,31:84-87.
[11]Li M.Solvothermal synthesis of LiCo1-xMnxPO4/C cathode materials for lithium-ion batteries[J].Ionics,2012,18(5):507-512.
[2]Han Y H,Ni J F,Liu J Z,et al.Improving electrochemical performance of LiCoPO4via Mn substitution[J].Mater Technol,2013,28(5):265-269.
[3]Fang L,Zhang H,Zhang Y,et al.Design and synthesis of twodimensional porous Fe-doped LiCoPO4 nano-plates as improved cathode for lithium ion batteries[J].J Power Sources,2016,312:101-108.
[4]Li H,Wang Y,Yang X,et al.Improved electrochemical performance of 5V LiCoPO4cathode materials via yttrium doping[J].Solid State Ionics,2014,255:84-88.
[5]汪燕鸣,朱波,刘晓玉,等.磷化钴对高电压正极材料电化学性能的影响[J].化工新型材料,2017,45(2):76-78.
[6]Li H,Li Yun,Chen L,et al.Microwave assisted synthesis of core-shell LiFe1/3 Mn1/3Co1/3PO4/C nanocomposite cathode for high-performance lithium-ion batteries[J].J Alloy Comp,2014,617:154-159.
[7]Yang S M G,Aravindan V,Cho W I,et al.Realizing the performance of LiCoPO4cathodes by Fe substitution with offStoichiometry[J].J Electrochem Soc,2012,159(7):A1013-A1018.
[8]Allen J L,Thompson Travis,Sakamoto Jeff,et al.Transport properties of LiCoPO4 and Fe-substituted LiCoPO4[J].J Power Sources,2014,254:204-208.
[9]Ni J F,Han Y,Liu J,et al.Improving electrochemical properties of LiCoPO4 by Mn substitution:a case research on LiCo0.5Mn0.5PO4[J].ECS Electrochem Lett,2013,2(2):A3-A5.
[10]Ni J,Han Y,Gao L,et al.One-pot synthesis of CNT-wired LiCo0.5Mn0.5PO4 nanocomposites[J].Electrochem Commun,2013,31:84-87.
[11]Li M.Solvothermal synthesis of LiCo1-xMnxPO4/C cathode materials for lithium-ion batteries[J].Ionics,2012,18(5):507-512.