采用两步固相原位烧结掺杂法制备了一系列镍掺杂的锂离子电池正极材料LiFe1-xNixPO4(x=0、0.03、0.05、0.07、0.10、0.15).Ni替代部分Fe,改变了LiFePO4的晶胞参教,细化了晶粒.充放电实验研究表明,低放电倍率(0.1C)时,LiFe0.095Ni0.05PO4的首次放电容量最大,为155mAh/g,较LiFePO4增加了22.8%;0.5C时,其容量为132mAh/g,较LiFePO4增加了14.7%;放电倍率增加为1C时,其容量也能达到122mAh/g,较LiFePO4增加了16.1%.适量掺杂Ni可提高LiFePO4的充放电比容量,改善其高倍率充放电性能.
参考文献
[1] | Nan J Y;Hyung W H;Kynng H J .Synthesis and electrochemical properties of olivine-type LiFePO4/C composite cathode material prepared from apoly(vinyl alcohol)-containing precursor[J].Journal of Power Sources,2006,160(19):1361. |
[2] | 施志聪,李晨,杨勇.LiFePO4新型正极材料电化学性能的研究[J].电化学,2003(01):9-14. |
[3] | Xin L L;Fei Y K;Xin D B.A novel network composite cathode of LiFePO4/muhiwalled carbon nanotubes with high rate capability for lithium ion batteries[J].Electrochemistry Communications,2007(09):663. |
[4] | 李冰,王殿龙.蜂窝结构球形LiFePO4/C的制备及性能[J].电池,2007(06):422-424. |
[5] | Wang G X;Needham S;Yao J et al.A study on LiFePO4 and its doped derivatives as cathode materials for lithium-ion batteries[J].Journal of Power Sources,2006,159:282. |
[6] | K.S. Park;J.T. Son;H.T. Chung;S.J. Kim;C.H. Lee;K.T. Kang;H.G. Kim .Surface modification by silver coating for improving electrochemical properties of LiFePO_4[J].Solid State Communications,2004(5):311-314. |
[7] | Chung S Y;Bloking J T;Chiang Y M et al.ElectronicaUy conductive phospho-olivines as lithium storage electrodes[J].Nature Materials,2002,1(02):123. |
[8] | 文衍宣,郑绵平,童张法,粟海锋,薛敏华.钛离子掺杂对LiFePO4结构和性能的影响[J].无机材料学报,2006(01):115-120. |
[9] | Barker J;Saidi M Y;Yazid S J et al.Lithium iron(Ⅱ) phospho-olivines prepared by a novel carbothermal reduction method[J].Electrochemical and Solid-State Letters,2003,6(03):A53. |
[10] | 王雷,唐致远,阮艳莉,胡冉.新型正极材料LiFePO4的电化学性能的改进[J].电源技术,2006(07):549-551,593. |
[11] | Aurbach D;Markovsky B;Salitra G et al.Review on electrode-electrolyte solution interactions,related to cathode materials for Li-ion batteries[J].Journal of Power Sources,2007,165:491. |
[12] | 唐红辉,戴曦,张传福,杨平.Ni2+掺杂LiFePO4正极材料的合成及性能[J].粉末冶金材料科学与工程,2006(04):244-248. |
[13] | 文衍宣,郑绵平,童张法,粟海锋,薛敏华.镍离子掺杂对LiFePO4结构和性能的影响[J].中国有色金属学报,2005(09):1436-1440. |
[14] | Prosini PP.;Lisi M.;Zane D.;Pasquali M. .Determination of the chemical diffusion coefficient of lithium in LiFePO4[J].Solid state ionics,2002(1/2):45-51. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%