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Prepn of high-rate lithium ion battery cathode material

A lithium-ion battery and cathode material technology, applied in the field of high-rate lithium-ion battery cathode material preparation, to achieve the effects of narrow particle size distribution, good crystallinity, and uniform particle shape

Inactive Publication Date: 2003-05-14
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, anode materials with excellent high-rate performance are not uncommon, but the research on high-rate cathode materials has not yet achieved phased results, which is a limiting factor for improving the charge-discharge rate of the entire lithium-ion battery system

Method used

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  • Prepn of high-rate lithium ion battery cathode material
  • Prepn of high-rate lithium ion battery cathode material
  • Prepn of high-rate lithium ion battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Accurately weigh 0.1mol LiNO 3 , 0.1mol Co(NO 3 ) 2 , dissolved in 100ml of absolute ethanol to obtain solution A; another accurately weighed 0.3mol NaOH, dissolved in 100ml of absolute ethanol to obtain solution B, and then solution B was dripped into solution A under strong mechanical stirring and ultrasonic vibration to obtain Viscous mixture. After standing still for 24 hours, use a high-speed centrifuge to separate the precipitate, dry it under vacuum at 120°C for 24 hours, and grind to obtain a brown loose reaction precursor. The precursor was calcined in a muffle furnace at 400°C for 10 hours to obtain a black solid product. Wash the product with deionized water until the pH is below 8, then wash and dehydrate with ethanol, at 120°C, in a vacuum of 10 -2 After vacuum drying under Torr and grinding, the final product LiCoO 2 . The particles are analyzed by transmission electron microscope, scanning electron microscope and XRD, and the particle diameter is le...

Embodiment 2

[0019] The brown loose reaction precursor obtained in Example 1 was calcined in an atmosphere sintering furnace at a temperature of 600° C. under an oxygen atmosphere for 5 hours to obtain a black solid product. Wash the product with deionized water until the pH is below 8, then wash and dehydrate with ethanol, at 120°C, in a vacuum of 10 -2 After vacuum drying under Torr and grinding, the final product LiNiO 2 . The product particles are analyzed by transmission electron microscope, scanning electron microscope and XRD, and the particle diameter is less than 30nm, which is square particles with uniform shape.

Embodiment 3

[0021] The brown loose reaction precursor obtained in Example 1 was calcined in a muffle furnace at a temperature of 500° C. for 10 hours to obtain a black solid product. Wash the product with deionized water until the pH is below 8, then wash and dehydrate with ethanol, at 120°C, in a vacuum of 10 -2 The final product was obtained after vacuum drying under Torr and grinding. The particles are analyzed by transmission electron microscope, scanning electron microscope and XRD, and the particle diameter is less than 80nm, which is sheet-like particles with uniform shape and single phase composition.

[0022] Weigh the product powder and carbon black according to the mass ratio of 6:3:1, polyvinylidene fluoride (PVDF), dissolve PVDF in a certain amount of N-methylpyrrolidone (NMP), and then mix the product powder with carbon black After adding, after 24 hours of high-speed mechanical stirring (600 rpm), a uniform slurry was obtained. The slurry is coated on the surface of a cle...

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PUM

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Abstract

In the preparation of the cathode material, soluble lithium salt, cobalt salt, nickel salt, etc. in polar organic solvent, and organic solution of hydroxide are coprecipitated and the precipitate is stoved and ground to obtain nano level cathode material grains; the grains are mixed with carbon black and polyvinylidene fluoride in certain proportion, added with solvent and the mixture is preparedinto the cathode material plate via curtain coating process. The lithium battery with the cathode material has the advantages of high voltage, high capacity, long circulation life and high safety. The lithium battery may be used in portable electronic equipment, electric vehicle space equipment, etc. The new cathode material makes the lithium battery capable of being charged and discharged in high rate and this is significant for the application of lithium battery in great power device.

Description

technical field [0001] The invention belongs to battery material preparation technology, in particular to a high-rate lithium-ion battery cathode material preparation method capable of rapidly synthesizing nano-scale particles. Background technique [0002] In the lithium-ion battery industry, the development of high-power power batteries that can be used in vehicles such as electric vehicles and large electrical appliances has always been a hot spot, and how to improve the charging and discharging rate of lithium-ion batteries and maintain a certain cycle life and capacity is the key issue. . At present, anode materials with excellent high-rate performance are not uncommon, but the research on high-rate cathode materials has not yet achieved phased results, which is a limiting factor for improving the charge-discharge rate of the entire lithium-ion battery system. Contents of the invention [0003] The object of the present invention is to provide a method for preparing ...

Claims

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Application Information

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IPC IPC(8): C01D15/02H01M4/02H01M4/04H01M4/131H01M4/1391H01M4/48H01M4/52H01M4/525H01M4/58H01M10/052H01M10/36
CPCY02E60/122H01M4/525Y02T10/7011H01M4/131H01M10/052H01M4/1391Y02E60/10
Inventor 邱新平陈海龙朱文涛何志奇梁宏莹陈立泉诸学农
Owner TSINGHUA UNIV
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