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Citation: Tang Zhi-Yuan, Feng Ji-Jun. Studies on Spinel LiMn_2－xLa_xO₄ Cathode Material for Lithium-ion Batteries[J]. Acta Physico-Chimica Sinica, ;2003, 19(11): 1025-1029. doi: 10.3866/PKU.WHXB20031108 shu

Studies on Spinel LiMn_2－xLa_xO₄ Cathode Material for Lithium-ion Batteries

1.
School of Chemical Engineering and Technology, Tianjin University, Tianjin　300072

Received Date: 16 May 2003
Available Online: 15 November 2003

The lanthanum doped modified spinel lithium manganate LiMn2－xLaxO4 (x=0,0.01, 0.02, 0.03, 0.04, 0.05, 0.10) used for cathode of lithium-ion batteries was prepared by solid-state method. The structure of the prepared cathode material was characterized by XRD. The effects of doping lanthanum on stabilizing the crystal structure were analyzed in terms of the material structure, charge and discharge testing results and cycle performance. The cycle performance of the modified material was obviously improved at both normal temperature and high temperature. Moreover, when the x in LiMn2－xLaxO4 was less than 0.04,high capacity can be observed. For instance, LiMn1.99La0.01O4 and LiMn1.98La0.02O4 have as high capacity as 122.4 mAh•g－1 and 116.7 mAh•g－1(see Fig.5(a)) respectively compared with the 120.8 mAh•g－1 of LiMn2O4. In addition, these two cathode materials can hold 95.60％ and 97.46％ of the initial capacity respectively after 50 cycles.
- Cathode material;Spinel;Dope;Cycle performance
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沈阳化工大学材料科学与工程学院沈阳 110142

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Studies on Spinel LiMn2－xLaxO4 Cathode Material for Lithium-ion Batteries

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Studies on Spinel LiMn_2－xLa_xO₄ Cathode Material for Lithium-ion Batteries