Mixtures of TiO2·0.2H2O and LiFePO4 as Li-ion Battery Cathode Materials

Zi Jian Hong; Zi Long Tang; Yu Xing Xu; Ye Hong; Ao Tan; Zhong Tai Zhang

doi:10.4028/www.scientific.net/KEM.512-515.1592

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 512-515Mixtures of TiO2·0.2H2O and LiFePO4 as Li-ion...

Mixtures of TiO₂·0.2H₂O and LiFePO₄ as Li-ion Battery Cathode Materials

Abstract:

Mixtures of TiO₂•0.2H₂O (HTO) and LiFePO₄ were prepared via three main composite methods: 2-2 series model, 2-2 parallel model and 3-3 model. HTO had been reported to exhibit high specific capacity (~200 mAh/g at 1 C) as well as excellent cycle property, whereas its voltage plateau was too low (about 1.7 V vs. Li) as a cathode material. LiFePO₄ was a promising cathode material for its high voltage plateau (about 3.4 V vs. Li), low cost and high specific capacity (~150 mAh/g at 1 C). However, because of its low conductivity, the rate property as well as cycle property was limited. The mixtures of HTO and LiFePO4 were considered to combine the advantages of both materials. By comparison, the 2-2 parallel model excelled in both rate property and cycle property. Its specific capacity can reach as high as 220 mAh/g with a high specific energy of 450 Wh/Kg at 0.1 C. Even after cycled 200 times at 2 C, the capacity can still be higher than 100 mAh/g. CV measurements and a combined constant current and constant voltage tests supported a two plateaus process for 2-2 parallel model. The charge-discharge voltage gap increased for the 2-2 parallel composites, which was supposed to be related to the interface. In general, the specific energy was much higher than HTO while the specific capacity as well as cycle property was much better than LiFePO₄ as a cathode material. .

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Key Engineering Materials (Volumes 512-515)

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1592-1597

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https://doi.org/10.4028/www.scientific.net/KEM.512-515.1592

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June 2012

Authors:

Zi Jian Hong, Zi Long Tang, Yu Xing Xu, Ye Hong, Ao Tan, Zhong Tai Zhang

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2-2 Parallel Model, Cathode Material, Lithium-Ion Battery

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