Thrice sintering synthetic method for lithium cobalt oxide
A synthesis method and secondary sintering technology, applied in the direction of cobalt compounds, chemical instruments and methods, structural parts, etc., to achieve the effect of improving the discharge voltage platform, the three major electrochemical indicators of lithium cobalt oxide materials, and good technical performance
Inactive Publication Date: 2004-11-03
HUNAN RESHINE NEW MATERIAL
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is: to solve the problem that the existing synthesis method of lithium cobalt oxide, the positive electrode material of lithium ion battery, takes care of one thing and loses the other when dealing with the three major electrochemical indicators of lithium cobalt oxide specific capacity, voltage platform, and cycle attenuation, cannot take into account, and affects lithium cobalt oxide The problem of product technical performance and quality improvement; the purpose of the present invention is to overcome the defects of the above-mentioned prior art, and to provide a high-quality lithium-ion battery positive electrode with high tap density, high discharge voltage platform, and good cycle performance. Material Lithium cobalt oxide triple sintering synthesis method
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Embodiment 1
[0021] Embodiment 1: press Li: the mol ratio of Co is 1.03 Li 2 CO 3 with Co 3 o 4 Mix well and perform three sinterings:
[0022] 1. Rapidly heat up the above-mentioned mixed materials to 920°C in a continuous pusher kiln at a heating rate of 10°C / min. And keep it at high temperature for 6 hours, then lower it to room temperature and crush it with a jaw crusher or a roller crusher; the particle size is less than 2mm;
[0023] 2. Put the pulverized semi-finished product above in a continuous pusher kiln at a heating rate of 2°C / min, slowly raise the temperature to 920°C, and keep it at high temperature for 10 hours, then reduce it to room temperature and crush it with a roller crusher, the particle size is < 1mm, and then crushed and classified with a jet mill classifier;
[0024] 3. The semi-finished product that is pulverized and classified after the secondary sintering and has uniform particles is directly heated to 550°C at a heating rate of 4°C / min, and heat-treated ...
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The present invention is triple sintering synthesis process of lithium cobalt dioxide as the positive electrode material for lithium cell battery. The triple sintering synthesis process includes the first sintering of fast temperature raising of mixing of lithium and cobalt, high temperature processing for certain time, cooling to room temperature and crushing; the secondary sintering of slow temperature raising, high temperature processing for full reaction, cooling to room temperature, crushing and grading; and the third sintering of raising temperature at medium rate, processing at relatively low temperature for some time and sieving. The produced lithium cobalt dioxide material has high quality and excellent technological performance.
Description
Technical field: [0001] The invention relates to a method for preparing a battery material, in particular to a method for tertiary sintering and synthesis of high-quality lithium ion battery anode material lithium cobalt oxide. Background technique: [0002] Lithium-ion batteries have the advantages of high working voltage (up to 3.6 volts for a single battery), small size, light weight, large specific energy, no memory effect, no pollution, small self-discharge, and long cycle life. They are ideal for key development in the 21st century. Energy is widely used in portable electrical appliances such as mobile phones, notebook computers, and cameras (among them, the battery market for mobile phones is the largest), and new applications (such as electric vehicles) are already being explored. Lithium cobaltate, as the mainstream positive electrode material of lithium batteries, accounts for about 40% of the material cost of lithium-ion battery cells, and 70% of the performance o...
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Login to View More IPC IPC(8): C01G51/00H01M4/525
CPCY02E60/10
Inventor 胡国荣
Owner HUNAN RESHINE NEW MATERIAL