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A kind of high crystallinity lithium ion battery cathode material synthesis method and cathode material

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of high-crystallinity lithium-ion battery positive electrode material synthesis methods and positive electrode materials, can solve problems such as difficult synthesis, electrochemical performance degradation, and difficulty in obtaining, and achieve excellent high-temperature storage and cycle performance Excellent, well-developed crystal results

Active Publication Date: 2021-10-22
湖南桑瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Products with high nickel content in ternary materials are difficult to synthesize. On the one hand, it is difficult to oxidize Ni, and on the other hand, the radius of Ni ions and Li ions is close, which makes it easy to mix and mix, which makes it difficult to obtain the stoichiometric ratio of Li / M. product
However, excessive lithium may not be able to enter the interior of the crystal lattice, but is likely to remain on the surface of the ternary material, resulting in unstable material structure, high alkalinity, easy water absorption, poor processing performance and high temperature performance, etc.
Excess lithium will also act as a flux to promote the fusion and growth of primary particles of ternary materials, resulting in poor crystal structure stability, increased lithium ion diffusion distance, and deterioration of electrochemical performance.

Method used

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  • A kind of high crystallinity lithium ion battery cathode material synthesis method and cathode material
  • A kind of high crystallinity lithium ion battery cathode material synthesis method and cathode material
  • A kind of high crystallinity lithium ion battery cathode material synthesis method and cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh the precursor Ni according to the molar ratio of Li:(Ni+Co+Mn)=0.9 0.6 co 0.2 mn 0.2 (OH) 2 and lithium carbonate, then add 0.1% Al 2 o 3 Place in a high-speed mixer, first mix at a low speed of 500r / min for 10min, then mix at a high speed of 1000r / min for 30min; place the uniformly mixed material in a sintering furnace under an oxygen atmosphere for sintering at 885°C for 12h to obtain a positive electrode material matrix;

[0031] Weigh the above-mentioned cathode material matrix and lithium hydroxide according to the molar ratio of Li:(Ni+Co+Mn)=0.16, then add 0.1% rutile TiO 2 Place in a high-speed mixer, first mix at a low speed of 300r / min for 10min, then mix at a high speed of 800r / min for 25min; place the uniformly mixed material in a sintering furnace under an air atmosphere for sintering at 750°C for 8h to obtain Al-doped Ti Coated cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 ;

[0032]The 0.1C discharge specific capacity of the target positive ...

Embodiment 2

[0034] Weigh the precursor Ni according to the molar ratio of Li:(Ni+Co+Mn)=0.86 0.8 co 0.1 mn 0.1 (OH) 2 and lithium carbonate, then add 0.1% Al 2 o 3 Place in a high-speed mixer, first mix at a low speed of 500r / min for 10min, then mix at a high speed of 1000r / min for 30min; place the uniformly mixed material in a sintering furnace under an oxygen atmosphere for sintering at 770°C for 10h to obtain a positive electrode material matrix;

[0035] Weigh the above positive electrode material substrate and lithium hydroxide according to the molar ratio of Li:(Ni+Co+Mn)=0.17, then add 0.1% SiO 2 Place in a high-speed mixer, first mix at a low speed of 300r / min for 10min, then mix at a high speed of 800r / min for 25min; place the uniformly mixed material in a sintering furnace at 650°C for 10h under an air atmosphere to obtain Al-doped Si Coated cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 ;

[0036] The 0.1C discharge specific capacity of the target positive electrode mate...

Embodiment 3

[0038] Weigh the precursor Ni according to the molar ratio of Li:(Ni+Co+Mn)=0.75 0.85 co 0.1 al 0.05 (OH) 2 and lithium carbonate, then add 0.1% Al 2 o 3 Place in a high-speed mixer, first mix at a low speed of 500r / min for 10min, and then mix at a high speed of 1000r / min for 30min; place the uniformly mixed material in a sintering furnace under an oxygen atmosphere for sintering at 770°C for 8h to obtain a positive electrode material matrix;

[0039] Weigh the above-mentioned cathode material substrate and lithium hydroxide according to the molar ratio of Li:(Ni+Co+Mn)=0.27, then add 0.1% B 2 o 3 Place in a high-speed mixer, first mix at a low speed of 300r / min for 10min, then mix at a high speed of 800r / min for 25min; place the uniformly mixed material in a sintering furnace at 650°C for 12h in an air atmosphere to obtain Al-doped B Coated cathode material LiNi 0.85 co 0.1 al 0.05 o 2 ;

[0040] The 0.1C discharge specific capacity of the target positive electrode...

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Abstract

The invention discloses a method for synthesizing a positive electrode material of a lithium ion battery with high crystallinity and the positive electrode material. The positive electrode material with high crystallinity is synthesized through two batching and two times of sintering, and a positive electrode material with high crystallinity and low alkalinity is obtained. The present invention The material has well-developed crystals, high crystallinity, and less residual lithium on the surface. After being assembled into a battery, it has the characteristics of high specific capacity, stable cycle performance, and excellent high-temperature storage and cycle performance.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a method for synthesizing a high-crystallinity lithium-ion battery cathode material and the cathode material. Background technique [0002] Automobile exhaust is an important reason for the formation of smog. In order to save energy, reduce emissions, and control air pollution, the Chinese government vigorously promotes new energy vehicles that use lithium-ion batteries as energy supply systems to replace traditional fossil energy vehicles. When charging and working, lithium-ion batteries use lithium-ion deintercalation and electron movement to store and release energy, which can achieve true "zero emission" and completely solve the problem of automobile exhaust. [0003] By the end of 2015, the number of motor vehicles in the country reached 279 million, including 172 million cars. China has become the world's largest car sales country. According to data from th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M4/04
CPCY02E60/10
Inventor 唐泽勋陈敏冯泽商士波胡泽林
Owner 湖南桑瑞新材料有限公司
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