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Studies on Multi-doped Lithium Nickel Cobalt Oxides as Cathode Materials for Lithium Secondary Batteries

Author: ChenHongHao
Tutor: ZhouYunHong
School: Wuhan University
Course: Physical and chemical
Keywords: Lithium-ion battery cathode materials Lithium nickel cobalt oxide Doping Rheological phase
CLC: TM911
Type: Master's thesis
Year: 2005
Downloads: 291
Quote: 3
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Abstract


The lithium-ion battery with high voltage, energy density, low self-discharge, no memory effect, etc., the last decade has made rapid development, in the terminal equipment in the field of notebook computers, mobile phones, video cameras and other mobile electronics accounted for dominant position. At the same time, it is in the fields of military, aerospace and electric vehicles are gaining in importance. So far, most of the industrialization of lithium-ion battery cathode material used the LiCoO 2 , due to the relatively meager resources of cobalt, high prices, high toxicity, and can only provide about 150mAh / g actual capacity greatly restricted the further development and application of a lithium-ion battery; LiNiO 2 Although the price is relatively cheap, but higher than the capacity of synthetic stoichiometric LiNiO 2 very difficult, due to de-the Li lithium state 1-x, of NiO , 2 poor thermal stability, the battery will bring a serious security risk, therefore, this material The practical application is still faced with many problems. Respective defects due to the above two materials, the researchers synthesized them on the basis of of LiNi 1-y Co the y O 2 Series material . It is not only the capacity is improved compared with LiCoO 2 and LiNiO 2 materials, good cycle performance, and its further doping, but also effectively improve its electrochemical and safety performance. Therefore, for of Co. y the LiNi -y O 2 series of materials by the extensive attention. In this paper, structural analysis and electrochemical means, a comprehensive study of the rheological phase synthesis the LiNi x the Co. 1-x O 2 conditions control, and on this basis, the doped LiNi 0.85 Co 0.15 O 2 structure of the cathode material surface properties, thermal stability, and electrical chemical performance analysis, research can be divided into the following sections: 1) to adopt the the rheological phase synthesis the LiNi 1-y Co y O 2 Series materials to optimize the synthesis conditions. Rheological phase synthesis of precursor sintered get the LiNi -y Co y O 2 . Ni, Co ratio and sintering temperature changes on the synthesis conditions to be optimized. XRD and electrochemical test results show that, in an oxygen atmosphere, 800 ℃ sintered get six hours LiNi 0.85 Co 0.15 O 2 materials has the full layered structure and excellent electrochemical performance. The initial discharge capacity of 198.2 mAh / g, the capacity retention rate remained at about 90% after 20 weeks cycle. Compared with the high-temperature solid-phase method, rheological phase synthesis of samples either in the structural integrity of the electrochemical performance has improved significantly. 2) aluminum doped layered lithium nickel cobalt oxide. Rheological phase synthesis of a series of aluminum doped the LiNi 0.85 Co 0.15-y Al y O 2 materials, preliminary The effects of aluminum doped LiNi 0.85 Co 0.15 O 2 structure of materials, electrochemical properties and thermal stability. The XRD results show that with the increase in the amount of aluminum-doped materials with lattice parameters a, C value increases, and due to the Al atoms substituted

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells
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