LiFePO4/C via fluoride doping
来源期刊：Rare Metals2012年第6期
论文作者：GU Yuan, ZHANG Xiangjun, LU Shigang, ZHAO Ting, JIANG Danping, YANG Rong, and WU Aide R&D Center for Vehicle Battery and Energy Storage, General Research Institute for Nonferrous Metals, Beijing , China
文章页码：573 - 577
摘 要：Non-stoichiometric compound fluoride-doped LiFePO4/C cathode materials were synthesized via solid-state reaction using MgF2 and AlF3 as dopant. The fluoride-doped LiFePO4/C samples were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and electrochemical testing. The results show that the materials are well crystallized and fluoride doping cannot change the space structure of LiFePO4. Slight amounts of Fe2O3 with no fluoride impurity were detected. Charge-discharge curves show that fluoride-doped samples have higher capacity at low rates compared with undoped LiFePO4/C. AlF3-doped samples have highest capacity at high discharge current. Both doped samples have larger polarization voltage than undoped samples. All samples exhibit good cycle stability.
GU Yuan, ZHANG Xiangjun, LU Shigang, ZHAO Ting, JIANG Danping, YANG Rong, and WU Aide R&D Center for Vehicle Battery and Energy Storage, General Research Institute for Nonferrous Metals, Beijing 100088, China
摘 要：Non-stoichiometric compound fluoride-doped LiFePO4/C cathode materials were synthesized via solid-state reaction using MgF2 and AlF3 as dopant. The fluoride-doped LiFePO4/C samples were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and electrochemical testing. The results show that the materials are well crystallized and fluoride doping cannot change the space structure of LiFePO4. Slight amounts of Fe2O3 with no fluoride impurity were detected. Charge-discharge curves show that fluoride-doped samples have higher capacity at low rates compared with undoped LiFePO4/C. AlF3-doped samples have highest capacity at high discharge current. Both doped samples have larger polarization voltage than undoped samples. All samples exhibit good cycle stability.
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