Secondary granulation lithium ion battery cathode material and preparation method thereof

A lithium-ion battery and secondary granulation technology, which is applied to secondary batteries, battery electrodes, circuits, etc., can solve the problems of short cycle life, poor low-temperature performance, and low specific energy density, and achieve excellent rate performance, excellent Low temperature performance and high energy density effect

Active Publication Date: 2016-02-03
JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems existing in the prior art such as the low specific energy density of the existing lithium-ion secondary battery, the large expansion coefficient of the negative electrode and the short cycle life, and provide a lithium-ion secondary battery with a high gram specific capacity, Negative electrode material with excellent cycle performance and excellent low temperature performance and preparation method thereof
[0009] Traditional graphite anode materials used in high-voltage battery systems still have shortcomings such as large expansion, poor low-temperature performance, and short life. The products of this project adopt the above-mentioned production process, which can effectively solve the shortcomings of large expansion, poor low-temperature performance, and short life. The main technical features (innovation points) of the product are as follows:

Method used

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  • Secondary granulation lithium ion battery cathode material and preparation method thereof
  • Secondary granulation lithium ion battery cathode material and preparation method thereof
  • Secondary granulation lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Use small-sized mesophase carbon microspheres as the substrate, medium-temperature asphalt as the coating and bonding material, and methyl naphthalene as the additive. The mass ratio of the substrate, coating and bonding material, and additive is 60:30:5 , first place the base material and the coating bonding material in a mixer, mix at 100°C for 120 minutes at a speed of 300r / min to obtain a mixed material; put the mixed material into a high-temperature reactor, and pass in argon For protection, react at a speed of 50Hz and a fusion temperature of 500°C for 6 hours to obtain a secondary granulated material; under the protection of argon, transfer the secondary granulated material to the cooling tank, The rotating speed is lowered and cooled to room temperature; and then graphitized heat treatment is carried out at 2800°C to obtain secondary granulated high-voltage lithium-ion battery negative electrode materials. figure 1 It is a 2000 times SEM figure of Example 1 of t...

Embodiment 2

[0027] Petroleum coke is selected as the base material, high-temperature asphalt is selected as the coating bonding material, and methyl naphthalene is used as the additive. The mass ratio of the base material, coating bonding material, and additive is 70:40:4. The material and the coating adhesive material are placed in a mixer, and mixed at 90°C for 100 minutes at a speed of 350r / min to obtain a mixed material; the mixed material is put into a high-temperature reaction kettle, and helium is introduced for protection. The rotating speed of 60Hz and the fusion temperature of 600°C were reacted for 7 hours to obtain the secondary granulated material; under the protection of helium, the secondary granulated material was transferred to the cooling tank, and the temperature was lowered at the rotating speed of 60Hz cooling to room temperature; and then performing graphitization heat treatment at 2700° C. to obtain a secondary granulated high-voltage lithium-ion battery negative ele...

Embodiment 3

[0029] Select pitch coke as the base material, phenolic resin, etc. as the coating bonding material, and acenaphthene as the additive, and the mass ratio of the base material, coating bonding material, and additive is 80:25:6. Firstly, the base material and The coated bonding material is placed in a mixer, and mixed at 120°C for 140 minutes at a speed of 400r / min to obtain a mixed material; put the mixed material into a high-temperature reaction kettle, and pass in neon gas for protection. Rotational speed, reaction at a fusion temperature of 400°C for 8 hours to obtain a secondary granulated material; under the protection of neon gas, transfer the secondary granulated material to the cooling tank, and cool it down at a rotational speed of 55Hz to room temperature; and then graphitized heat treatment at 2750° C. to obtain secondary granulated high-voltage lithium-ion battery negative electrode materials.

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Abstract

The invention discloses a preparation method of a secondary granulation lithium ion battery cathode material. The preparation method comprises the following steps of firstly, selecting corresponding base materials, coated bonding materials and additives, and mixing at a certain temperature and rotating speed for a certain time to obtain mixed materials; secondly, feeding the mixed materials into a high-pressure reactor for fusing to obtain a secondarily-granulated material; thirdly, transferring the secondarily-granulated material into a cooling kettle for cooling, and carrying out graphitization heat treatment. The invention also discloses the secondary granulation lithium ion battery cathode material prepared by the preparation method. A lithium ion battery prepared from the secondary granulation lithium ion battery cathode material disclosed by the invention is superior to a traditional lithium ion battery in energy density, gram specific capacity, compaction density, cycle life and the like.

Description

technical field [0001] The invention relates to the field of graphite negative electrode materials, in particular to a secondary granulation lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Compared with the original batteries, lithium-ion batteries have been rapidly popularized in mobile phones and notebook computers due to their high energy density, long cycle life, and no memory effect. With the increasing requirements of various products for small, lightweight, multi-functional, and long-term driving, the capacity requirements for lithium-ion batteries are also increasing. At present, the improvement of lithium-ion battery capacity mainly depends on the development and improvement of negative electrode materials. . Therefore, for a long time, improving the specific capacity of lithium-ion battery anode materials, reducing the first irreversible capacity, and improving the rate characteristics have always bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525
CPCH01M4/366H01M4/587H01M10/0525H01M2004/021Y02E60/10
Inventor 罗建伟黄雨生吴壮雄张建峰丁侠靓
Owner JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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