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Preparation of hybrid perovskite-type Li_(0.33)La_(0.56)TiO_(3)by adding ionic liquids

Journal of Rare Earths 2023年第5期41卷 758-763,I0005页

作者： Xiaojuan Lu Xinyu Li Mingyang Duan Jiankang Hai Songtao Liu Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science and EngineeringNorth China Electric Power UniversityBaoding 071003China

Perovs kite-type Li_(0.33)La_(0.56)TiO_(3)(LLTO)shows greate r advantages than organic liquid electrolytes to be used in all-so lid-state lithium-ion batteries with high energy densities.ionic liquid[BMIM][BF4]was used to improve the properties of Li_(0.33)La_(0.56)TiO_(3)by attrition milling in this study.The microstructure,crystallinity and lithium-ion conductivity of the samples were measured by scanning electron microscopy(SEM),X-ray diffraction(XRD),and impedance spectroscopy(IS).The total ionic conductivities of the samples LLTO+x wt%[BMIM][BF4]increase upon adding[BMIM][BF4]and the maximum conductivity reaches4.71×10^(-4)S/cm when x=12.5 wt%.The enhancement of the total conductivity is ascribed to the bridging role of the ionic liquid among grains,as evidenced by the low activation energy of 0.17-0.25 eV and the SEM observation.The Li+transference numbers of the hybrid samples are all lower than that of the pure LLTO,indicating the existence of electronic conductions.The hybrid mate rial with a mixed conductivity and good stability in the atmosphere can find uses in all-solid-state lithium-ion batteries to improve the interface contact between electrolytes and electrodes.

关键词： lonic liquid lonic conductivity lithium-ion conductor Hybrid Lanthanum Rare earths

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Li4SiO4-coated LiNi0.5Mn1.5O4 as the high performance cathode materials for lithium-ion batteries

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Frontiers in Energy 2017年第3期11卷 374-382页

作者： Shifeng YANG Wenfeng REN Jian CHEN Advanced Rechargeable Battery Laboratory Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 University of Chinese Academy of Sciences Beijing 100049 China Advanced Rechargeable Battery Laboratory Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

The preparation of Li4SiO4-coated LiNi0.5Mn1.5O4 materials by sintering the SiO2-coated nickel-manganese oxides with lithium salts using abundant and low-cost sodium silicate as the silicon source was reported. The samples were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. It was found that a uniform and complete SiO2 coating layer could be obtained at a suitable pH value of 10, which transformed to a good LiaSiO4 coating layer afterwards. When used as the cathode materials for lithium-ion batteries, the Li4SiO4-coated LiNi0.5Mn1.5O4 samples deliver a better electrochemical performance in terms of the discharge capacity, rate capability, and cycling stability than that of the pristine material. It can still deliver 111.1 mAh/g at 20 C after 300 cycles, with a retention ratio of 93.1% of the stable capacity, which is far beyond that of the pristine material （101.3 mAh/g, 85.6%）.

关键词： lithium-ion batteries cathode material LiNi0.5Mn1.5O4 lithium-ion conductor coating

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