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Method for preparing ultralow-temperature lithium ion battery cathode slurry

A lithium-ion battery, cathode slurry technology, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of low cycle times, material cycle stability degradation, short service life, etc., to reduce electrode polarization , stable electrochemical performance, make up for the effect of poor safety and overshoot resistance

Inactive Publication Date: 2020-06-02
深圳市三奇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the doping elements are electrochemically inactive, the cycle stability of the material will rapidly decay after doping, that is, the number of cycles is less and the service life is shorter. A new technical solution is needed to solve the above problems

Method used

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  • Method for preparing ultralow-temperature lithium ion battery cathode slurry

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Embodiment 1

[0030] Embodiment 1: a kind of method of ultra-low temperature lithium-ion battery positive electrode slurry batching, comprises the following steps:

[0031] (a) Mix positive electrode active material and multi-walled carbon nanotubes, put into a ball mill and carry out ball milling at a speed of 300r / min for 3h, wherein the ball-to-material ratio is 8:1, and then place the ball-milled mixture in a vacuum drying oven Drying for 12 hours, fully grinding for 1 hour after cooling, to obtain the positive electrode active material;

[0032] (b) dissolving the binder in one-third of the solvent, then adding a conductive agent, a dispersant and a positive electrode active material, stirring at a speed of 30 r / min for 2 hours, and mixing evenly to obtain a base material;

[0033] (c) Add the remaining two-thirds of the solvent into the base material, stir at a speed of 30 r / min for 2 hours, and mix evenly to obtain a cathode slurry for an ultra-low temperature lithium ion battery.

...

Embodiment 2

[0037] Embodiment 2: a kind of method of ultra-low temperature lithium-ion battery positive electrode slurry batching, and the difference of embodiment 1 is:

[0038] The mass ratio among the positive electrode active material, the binder, the solvent, the conductive agent and the dispersant is 93:3:255:0.75:0.07.

[0039] LiCoPO 2 、LiFePO 4 The mass ratio between carbon nanotubes and multi-walled carbon nanotubes is 46.5:46.5:5.17.

Embodiment 3

[0040] Embodiment 3: a kind of method of ultra-low temperature lithium-ion battery positive electrode slurry batching, and the difference of embodiment 1 is:

[0041] The mass ratio among the positive electrode active material, the binder, the solvent, the conductive agent and the dispersant is 94:4:280:1:0.1.

[0042] LiCoPO 2 、LiFePO 4 The mass ratio between and multi-walled carbon nanotubes is 47:47:4.7.

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Abstract

The invention discloses a method for preparing ultralow-temperature lithium ion battery cathode slurry, and relates to the technical field of lithium ion batteries. The technical key points are as follows: the method for preparing the ultralow-temperature lithium ion battery cathode slurry comprises the following steps: (a) mixing a cathode active substance and a multi-walled carbon nanotube, putting the mixture into a ball mill for ball milling, then putting the ball-milled mixture into a vacuum drying oven for drying, cooling and then fully grinding to obtain a cathode active material; (b) dissolving a binder in part of a solvent, adding a conductive agent, a dispersing agent and a cathode active material, and performing uniform mixing to obtain a base material; (c) completely adding theremaining solvent into the base material to uniformly mixing to obtain the ultralow-temperature lithium ion battery cathode slurry. LiFePO2 is adopted to replace part of LiCoPO4, and then a certain amount of multi-walled carbon nanotubes are doped, so that after the prepared cathode slurry is applied to the lithium ion battery, the cycle service life of the battery is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, more specifically, it relates to a method for batching positive electrode slurry of ultra-low temperature lithium ion batteries. Background technique [0002] LiCoPO 2 It is the main positive electrode material for commercial lithium-ion batteries. The compound has stable electrochemical performance, is easy to synthesize, and has the advantages of high specific capacity and the like. However, due to the low abundance of cobalt in nature and its high price as an armament material, LiCoPO 2 Poor safety and overshoot resistance, which threatens its dominance in small batteries. [0003] In order to reduce the cost, improve the LiCoPO 2 Cycling performance and capacity, people try to replace cobalt with some other transition metals to suppress LiCoPO during cycling 2 The occurrence of a phase transition, that is, doping, reduces the cost of the material. These doping elements inc...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/485H01M4/505H01M4/58H01M10/0525
CPCH01M4/0402H01M4/485H01M4/505H01M4/5825H01M10/0525Y02E60/10
Inventor 朱辉李平
Owner 深圳市三奇科技有限公司
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