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A kind of preparation method of lithium-ion battery cathode material

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor specific capacity and cycle performance of lithium-ion batteries, poor high-temperature performance, and lack of cobalt resources, so as to improve electrochemical performance. performance, improved performance, improved security

Active Publication Date: 2016-08-10
HUBEI RONGBAI LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
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AI Technical Summary

Problems solved by technology

Although the lithium cobalt oxide cathode material has a high capacity and long cycle life, cobalt resources are scarce and the price is expensive; although the lithium manganese oxide cathode material is relatively low in price and has good safety performance compared with lithium cobalt oxide, it has low capacity and poor high temperature performance
The ternary material is a positive electrode material prepared from nickel salt, cobalt salt, and manganese salt. Since the ratio of nickel, cobalt, and manganese can be adjusted according to actual needs, the ternary material is a low-cost, high-safety, comprehensive performance material. Superior cathode materials are gradually popularized, but they have disadvantages such as low voltage platform, poor cycle performance, and poor discharge capacity, so they have not been widely used
The lithium-ion battery prepared by this method has poor specific capacity and cycle performance.

Method used

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preparation example Construction

[0024] The invention provides a method for preparing a positive electrode material for a lithium ion battery, which includes the following steps:

[0025] The lithium cobaltate and the ternary material are mixed and then tempered to obtain a lithium ion battery cathode material.

[0026] In the present invention, the lithium cobaltate and the ternary material are mixed and then tempered to obtain a lithium ion battery material. The present invention first mixes lithium cobalt oxide and ternary materials to obtain a mixture. In the present invention, it is preferable to mix lithium cobalt oxide and ternary materials in a ball mill, and more preferably to mix in a planetary ball mill; the lithium cobalt oxide and ternary materials The mass ratio of is preferably 3 to 5: 5 to 7, and more preferably 3 to 4: 5 to 6.

[0027] The uniformly mixed mixture is tempered to obtain a reaction product. In the present invention, it is preferable that the uniformly mixed mixture is charged into th...

Embodiment 1

[0046] After mixing 1000g of cobalt tetroxide, 492.5g of lithium carbonate, and 1g of nano-magnesium hydroxide with a planetary ball mill, they are put into the alumina sagger into the muffle furnace and reacted at 980°C for 10 hours. After cooling, they are crushed and sieved. Get the intermediate product. Add 0.2% of the material mass percentage of nano titanium dioxide to the intermediate product, use a planetary ball mill to fully mix, put the alumina sagger into the muffle furnace, and react at 940°C for 8 hours. After the reaction is completed, it is cooled, crushed, and passed. Sieve to obtain lithium cobalt oxide with a particle size D50 of 18.24 μm.

[0047] Use a planetary ball mill to thoroughly mix lithium carbonate and 1000g of NCM523 matrix. The molar ratio of the lithium carbonate based on lithium to NCM523 matrix based on Co is 1.07. The mixture is charged into an alumina sagger into the muffle furnace and reacted at 750°C. 10 hours. After cooling, it is crushed...

Embodiment 2

[0052] 1000g of cobalt tetroxide, 501.7g of lithium carbonate, and 1.5g of nano-magnesium hydroxide were thoroughly mixed with a planetary ball mill, and then put into the alumina sagger into the muffle furnace, and reacted at 970°C for 10 hours. After cooling, it is crushed and sieved to obtain an intermediate product. Add 0.3% of the material mass percentage of nano titanium dioxide to the intermediate product, use a planetary ball mill to fully mix, load the alumina sagger into the muffle furnace, and react at 950°C for 8 hours. After the reaction is completed, it is cooled, crushed, and passed. Sieve to obtain lithium cobalt oxide with a particle size D50 of 16.75 μm.

[0053] Use a planetary ball mill to thoroughly mix lithium carbonate and 1000g of NCM523 matrix. The molar ratio of the lithium carbonate based on lithium to NCM523 matrix based on Co is 1.09. The mixture is charged into an alumina sagger into the muffle furnace and reacted at 800°C. 10 hours. After cooling,...

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Abstract

The present invention relates to the technical field of lithium ion battery materials, and especially a preparation method of a lithium ion battery cathode material. The invention provides a preparation method of a lithium ion battery cathode material. The method comprises the following steps: mixing lithium cobalt oxide and a ternary material and tempering to obtain the lithium ion battery cathode material. Tempering treatment on the lithium cobalt oxide and the ternary material can improve the comprehensive performance, and used as the cathode material, the lithium cobalt oxide and the ternary material can improve the battery specific capacity, cycling performance and the first charge discharge efficiency, reduce costs, and improve safety of the battery. Further, the method provided by the invention employs nano-magnesium hydroxide and nano-titanium dioxide as additives for preparing the magnesium titanium doped lithium cobalt oxide, improves the performance of lithium ion battery cathode material, and can be applied to lithium ion battery to improve the discharge specific capacity of the cathode material, reduce capacity fading of lithium ion battery, increase the stability of lithium ion battery, and improve the electrochemical properties of the lithium ion battery.

Description

Technical field [0001] The invention relates to the technical field of lithium ion battery materials, and in particular to a method for preparing a lithium ion battery cathode material. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high energy density, good cycle performance, low self-discharge, no memory effect, and wide operating temperature range. They have been widely used in mobile phones, notebook computers, electronic instruments, portable power tools, and electric bicycles. And weapons and equipment. Lithium-ion batteries are mainly composed of cathode materials, anode materials, separators and electrolytes. The cathode materials account for more than 40% of the total cost of lithium batteries, and the performance of the cathode materials directly affects the performance indicators of lithium batteries. Therefore, lithium-ion battery cathode materials occupy a core position in lithium-ion batteries. [0003] Currently, the cathod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/1391
CPCH01M4/505H01M4/525H01M4/62Y02E60/10
Inventor 朱珠沈恒冠陆益展蔡运和
Owner HUBEI RONGBAI LITHIUM BATTERY MATERIAL CO LTD
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