钨掺杂对锂离子电池LiNiO_2正极材料性能的影响
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摘要
采用溶胶-凝胶法制备了钨掺杂镍酸锂正极材料(LiNi_(1-x)W_xO_2,x=1%、3%),研究了钨掺杂对LiNiO_2正极材料电化学性能的影响。结果表明,钨掺杂明显地改善了LiNiO_2的充放电循环性能,在100 mA·g~(-1)的电流密度和2.5～4.5 V电压范围的测试条件下,LiNi_(0.99)W_(0.01)O_2材料循环400次后的容量保持率为62.51%,而LiNiO_2在相同循环条件下的保持率仅为47.06%。同时,钨掺杂也提升了LiNiO_2的充放电倍率性能,掺杂材料在每一个倍率下放电比容量均高于未掺杂材料。
W-doping LiNiO_2(LiNi_(1-x)W_xO_2, x=1% and 3%) cathode materials were prepared by sol-gel method. The effects of W-doping on electrochemical performances of LiNiO_2 materials were studied. The results showed that W-doping significantly improved the cycle performance of LiNiO_2 during charge-discharge process. The capacity retention of the LiNi_(0.99)W_(0.01)O_2 was 62.51% at a current density of 100 mA·g~(-1) after 400 cycles in the voltage of 2.5～4.5 V, while the LiNiO_2 was only 47.06%. In addition, the rate performance of LiNiO_2 was improved at the same current rates.
W-doping LiNiO_2(LiNi_(1-x)W_xO_2, x=1% and 3%) cathode materials were prepared by sol-gel method. The effects of W-doping on electrochemical performances of LiNiO_2 materials were studied. The results showed that W-doping significantly improved the cycle performance of LiNiO_2 during charge-discharge process. The capacity retention of the LiNi_(0.99)W_(0.01)O_2 was 62.51% at a current density of 100 mA·g~(-1) after 400 cycles in the voltage of 2.5～4.5 V, while the LiNiO_2 was only 47.06%. In addition, the rate performance of LiNiO_2 was improved at the same current rates.
引文
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[28]Mansour A N.Surf.Sci.Spectra,1994,3(3):279-286
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