基于铬酸锂的新型正极材料的合成及其电化学行为
毕业论文关键词：改性铬酸锂；纳米球磨；喷雾干燥；高温固相法；倍率性能；循环性能 Synthesis and electrochemical behavior of a new cathode materials based on lithium chromate Abstract：This design modification of the lithium-ion battery cathode materials for lithium chromate, dual ion substitution reaction 1.5LiOH + 0.25Cr2O3 + 0.5TiO2 → Li1.5Cr0.5Ti0.5O2.5 + 0.75H2O of chrome spinel lithium LiCrO2 modified. The use of nano-synthesis reaction principle and high temperature calcination to prepare a regular morphology, particle size consistency good LiCrO2 cathode material, and by X-ray diffraction (XRD) phase composition, morphology, by charging and discharging cycle test, cyclic voltammetry (CV) and electrochemical impedance characterize the performance of a synthetic material. In this study, to take a different synthesis temperature (600 ℃, 700 ℃ and 800 ℃), different lithium content and the amount of different packages to synthesize carbon target product Li1.5Cr0.5Ti0.5O2.5, to synthesize a good electrochemical performance Lithium Ion Battery. Through experiments we found that Lithium chromate basically do not have the electrochemical properties, but after the adoption of doping Ti electrochemical performance improved significantly, Li1.5Cr0.5Ti0.5O2.5 initial charge capacity was 170mAh / g, the first discharge capacity of 100mAh / g, has been greatly improved than LiCrO2. By 20 cycles of charge, the charging capacity retention ratio Li1.5Cr0.5Ti0.5O2.5 was 99.61%, 94.03% retention rate of discharge, exhibit excellent cycle stability; and the charge-discharge process of redox peaks spacing 7 to 0.312V, with good reversibility.
KeyWords: LiCrO2, nano-milling, spray drying, high-temperature solid-state reaction, rate performance, cycle performance
目录
第一章绪论 1
1.1引言 .. 1
1.2 锂离子电池简介 1
1.2.1 锂离子电池发展状况 1
1.2.2 锂离子电池的结构和工作原理 . 2
1.2.3 锂离子电池正极材料 3
1.3 锂离子电池的正极材料 LiCrO2的研究进展 . 3
1.3.1LiCrO2结构和电化学性能 .. 4
1.3.2LiCrO2的制备方法 .. 4
1.3.3 LiCrO2的改性研究 . 5
1.4 课题的主要内容 6
1.4.1 课题研究的目的和意义 . 6
1.4.2 课题研究内容 6
1.4.3 实验方案设计 7
第二章实验及表征 8
2.1 实验原料 8
2.2 实验仪器 8
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