采用草酸盐前驱体合成Ti4+、Mg2+掺杂正极材料Li(Ni1/3Co1/3-xMn1/3)MxO2(M=Ti, Mg).利用XRD和SEM对其结构和形貌进行表征,并采用循环伏安、交流阻抗、恒流/恒压充放电测试其电化学性能.结果表明:Ti4+、Mg2+掺杂后晶胞体积增大,大倍率充放电时LiNi1/3Co1/3Mn1/3O2的电化学反应阻抗Rct降低,其大倍率充放电性能得到改善,Ti4+掺杂效果更好;当掺杂量x=0.025时,材料晶型完整,具有单一的a-NaFeO2层状结构;1C倍率时Li(Ni1/3Co1/3-0.025Mn1/3)Ti0.025O2的第二循环放电容量为143.2 mA-h/g,2C时为128.0 mA-h/g,经100次循环后容量分别为132.5和115.8 mA-h/g,容量保持率为92.53%和90.47%.
参考文献
[1] | OHZUKU T;MAKIMURA Y .Layered lithium insertion material of LiCo1/3Ni1/3Mn1/3O2 for lithium-ion batteries[J].Chemistry Letters,2001,7:642-643. |
[2] | K. M. Shaju;G. V. Subba;Rao;B. V. R. Chowdari .Performance of layered Li(Ni{sub}(1/3)Co{sub}(1/3)Mn{sub}(1/3))O{sub}2 as cathode for Li-ion batteries[J].Electrochimica Acta,2002(2):145-151. |
[3] | YABUUCHI N;OHZUKU T .Novel lithium insertion material of LiCo1/3Ni1/3Mn1/3O2 for advanced lithium-ion batteries[J].Journal of Power Sources,2003,19/121(1/2):171-174. |
[4] | Hiroshi Yoshizawa;Tsutomu Ohzuku .An application of lithium cobalt nickel manganese oxide to high-power and high-energy density lithium-ion batteries[J].Journal of Power Sources,2007(2):813-817. |
[5] | CHO T H;PARK S M;YOSHIO M T;HIRAI L HIDESHIMA Y .Effect of synthesis condition on the structural and electrochemical properties of Li[Ni1/3Mn1/3Co1/3]O2 prepared by carbonate co-precipitation method[J].Journal of Power Sources,2005,142(1/2):306-312. |
[6] | Bin Lin;Zhaoyin Wen;Zhonghua Gu;Xiaoxiong Xu .Preparation and electrochemical properties of Li[Ni_(1/3)Co_(1/3)Mn_(1-x/3)Zr_(x/3)]O_2 cathode materials for Li-ion batteries[J].Journal of Power Sources,2007(2):544-547. |
[7] | Daotan Liu;Zhaoxiang Wang;Liquan Chen .Comparison of structure and electrochemistry of Al- and Fe-doped LiNi{sub}(1/3)Co{sub}(1/3)Mn{sub}(1/3)O{sub}2[J].Electrochimica Acta,2006(20):4199-4203. |
[8] | L. Liao;X. Wang;X. Luo .Synthesis and electrochemical properties of layered Li[Ni_(0.333)Co_(0.333)Mn_(0.293)Al_(0.04)]O_(2-z)F_z cathode materials prepared by the sol-gel method[J].Journal of Power Sources,2006(1):657-661. |
[9] | LI De-cheng;KATO Y;KOBAYAKAWA K;NOGUCHI H SATO Y .Preparation and electrochemical characteristics of LiNi1/3Mn1/3Co1/3O2 coated with metal oxides coating[J].Journal of Power Sources,2006,160(02):1342-1348. |
[10] | KIM H;KONG M;KIM K;KIM I GU H .Effect of carbon coating on LiNi1/3Mn1/3Co1/3O2 cathode material for lithium secondary batteries[J].Journal of Power Sources,2007,171(02):917-921. |
[11] | KIM W S;CHUNG K .Synthesis and charge-discharge properties of LiNi1-x-yCoxMyO2 (M=Al,Ga) compounds[J].J Powder Source,2003,115(01):101-109. |
[12] | CHUNG S Y;BLOKING J T;CHIANG Y M .Electronically conductive phosphor-olivines as lithium storage electrodes[J].Nature Materials,2002,1:123-128. |
[13] | 张传福,湛菁,邬建辉,黎昌俊.Preparation and characterization of fibrous NiO particles by thermal decomposition of nickelous complex precursors[J].中国有色金属学会会刊(英文版),2004(04):713-717. |
[14] | KIM J M;CHUNG H T .Electrochemical characteristics of orthorhombic LiMnO2 with different degrees of stacking faults[J].Journal of Power Sources,2003,115(01):125-130. |
[15] | Young-Il Jang;Biying Huang;Haifeng Wang;Donald R. Sadoway;Yet-Ming Chiang .Electrochemical cycling-induced spinel formation in high-charge-capacity orthorhombic LiMnO{sub}2[J].Journal of the Electrochemical Society,1999(9):3217-3223. |
[16] | 盛世雄.X射线衍射分析技术[M].北京:冶金工业出版社,1986:97-99. |
[17] | Z.H.Lu;X.J.Huang .The phase transition and optimal synthesis temperature of LiNiO2[J].Solid state ionics,1999(1/4):103-107. |
[18] | YOSHIO M;TODOROV Y;YAMATO K;NOGUCHI H ITOH J OKADA M MOURI T .Perparation of LiyMnxNi1-xO2 as a cathode for lithium-ion batteries[J].Journal of Power Sources,1998,74(01):46-53. |
[19] | MOSHTEV R V;ZLATILOVA P;MANEV V;SATO A .The LiNiO2 solid solution as a cathode material for rechargeable lithium batteries[J].Journal of Power Sources,1995,54(02):329-333. |
[20] | GAO Y;YAKOVLEVA M .Lithium metal oxide containing multiple dopants and method of preparing same[P].US 6277521B1,2001. |
[21] | 刘永安;罗益民;唐英.大学物理学[M].长沙:中南大学出版社,2001:394-397. |
[22] | 史美伦.交流阻抗谱原理及应用[M].北京:国防工业出版社,2001:21. |
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