| LiMn_2O_4中锂离子扩散系数与充/放电次数的关系 |
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| 引用本文： | 唐新村,黄伯云,贺跃辉.LiMn_2O_4中锂离子扩散系数与充/放电次数的关系[J].物理化学学报,2005,21(9). |
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| 作者姓名： | 唐新村 黄伯云 贺跃辉 |
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| 作者单位： | 1. 中南大学化学化工学院,长沙,410083
2. 中南大学粉末冶金国家重点实验室,长沙,410083 |
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| 基金项目： | 国家自然科学基金(20406024)，中南大学博士后基金(76600)资助项目~~ |
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| 摘 要： | 通过容量间歇滴定技术(CITT)对不同电压、不同循环次数下,锂离子在尖晶石LiMn_2O_4中的固相扩散系数进行了研究.结果表明,锂离子在尖晶石LiMn_2O_4正极材料中的固相扩散系数在3.95V和4.12V左右存在两个极小峰,随着循环次数的增加,这两个峰逐渐平坦,并且整体上固相扩散系数呈增大趋势,表明锂离子在LiMn_2O_4中重复脱/嵌时具有自我增强扩散的能力.
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| 关 键 词： | 容量间歇滴定技术 固相扩散系数 LiMn_2O_4 锂离子电池 |
Dependence of Li Diffusion Coefficients in LiMn_2O_4 on Charge/Discharge Cycles |
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| TANG,Xin-Cun,HUANG,Bo-Yun,HE,Yue-Hui.Dependence of Li Diffusion Coefficients in LiMn_2O_4 on Charge/Discharge Cycles[J].Acta Physico-Chimica Sinica,2005,21(9). |
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| Authors: | TANG Xin-Cun HUANG Bo-Yun HE Yue-Hui |
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| Institution: | TANG,Xin-Cun1 HUANG,Bo-Yun2 HE,Yue-Hui2 |
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| Abstract: | The solid diffusion coefficient of lithium-ion in spinel LiMn2O4 cathode material has been investigated by the capacity intermittent titration technique (CITT) at different voltages and at different charge/discharge cycles. Results show that there are two minimum peaks in the curves of the solid diffusion coefficient (D) vs voltage (E) at 3.95 V and 4.12 V in the voltage range from 3.85 V to 4.30 V. The curves of lgD- E for the first 20 cycles show that the two minimum peaks are gradually flatted out and the values of solid diffusion coefficient tend to increase when the cycling number increases. The results suggest that LiMn2O4 cathode material has the ability of self- diffusionenhance during intercalation/deintercalation of lithium-ion. |
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| Keywords: | Capacity intermittent titration technique Solid diffusion coefficient LiMn_2O_4 Lithium-ion batteries |
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