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Preparation method of high-rate lithium ion battery slurry

A lithium-ion battery, high-rate technology, applied in the direction of hybrid methods, secondary batteries, battery electrodes, etc., can solve the problems of long stirring time, insufficient flexibility, unfavorable production efficiency, etc., to achieve high-rate performance and short stirring time , the effect of mixing evenly

Inactive Publication Date: 2019-02-12
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages are: the stirring time is too long, usually it takes about 8 hours to prepare a pot of slurry, and all materials need to be re-deployed for each pot of slurry, the time for multiple pulping is long, and there is a strict sequence between each step Sequence, not flexible enough, not conducive to productivity efficiency

Method used

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  • Preparation method of high-rate lithium ion battery slurry
  • Preparation method of high-rate lithium ion battery slurry
  • Preparation method of high-rate lithium ion battery slurry

Examples

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preparation example Construction

[0032] Such as figure 1 , the present invention provides a kind of preparation method of high-rate lithium-ion battery slurry, comprising the following steps: step a, mixing slurry: stirring the binder and conductive slurry evenly to prepare a slurry mixture; step b, mixing dry powder Stir the active material and the conductive dry powder to obtain a dry powder mixture; step c, adding a solvent and stirring: mix the slurry mixture and the dry powder mixture and add a solvent and stir evenly to obtain a high-rate lithium-ion battery slurry. In this method, the binder with dispersing function and the conductive slurry that is difficult to disperse are stirred, mixed and dispersed in advance, and the easily mixed granular solid active material and conductive dry powder are mixed together, and then combined together and stirred and mixed with a solvent. This method is beneficial to fully disperse the prepared lithium-ion battery positive electrode slurry uniformly, improve the mix...

Embodiment 1

[0039] Sa. Add 400kg of conductive paste CNT with a solid content of 5%, 280kg of conductive paste graphene with a solid content of 5%, and 40kg of PVDF dry powder as a binder in a 500L double planetary stirred tank, and stir at 45rpm in revolution and 1500rpm in rotation After 3 hours, the positive electrode conductive paste mixture was prepared, and stirred at a slow speed at a revolution of 15 rpm and an autorotation of 100 rpm.

[0040] Sb. In a 2000L dry powder ball mill, add 1600kg of active material lithium iron phosphate, 16kg of conductive dry powder SUPER-P, and 8kg of conductive dry powder ECP600JD, and stir at a speed of 150rpm for 1 hour to prepare a positive electrode dry powder mixture.

[0041] Sc, put 120kg of the prepared conductive paste mixture, 400kg of the prepared positive electrode dry powder mixture, and 290kg of NMP solvent in a 500L double planetary stirring tank, press 45rpm in revolution, 1200rpm in rotation, and mix and stir for 2.5h to obtain a so...

Embodiment 2

[0043] Sa. Add 300kg of conductive paste CNT with a solid content of 5%, 220kg of conductive paste graphene with a solid content of 5%, and 27kg of PVDF dry powder as a binder in a 400L double planetary stirred tank, and stir at 45rpm in revolution and 1500rpm in rotation After 3 hours, the positive electrode conductive paste mixture was prepared, and stirred slowly at a revolution of 15 rpm and an autorotation of 80 rpm.

[0044] Sb. In a 1000L dual-planetary stirring tank, add 800kg of active material nickel-cobalt-manganese ternary material, 8kg of conductive dry powder SUPER-P, and 4kg of conductive dry powder ECP600JD, and stir at 45rpm per revolution and 1000rpm at self-rotating speed for 0.5h to prepare a positive electrode dry powder mixture.

[0045] Sc, put 60kg of the prepared conductive paste mixture, 200kg of the prepared positive electrode dry powder mixture, and 85kg of NMP solvent in a 500L double planetary stirring tank, according to the revolution of 45rpm, th...

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Abstract

The invention provides a preparation method of high-rate lithium ion battery slurry. The method comprises the following steps of (a) slurry mixing: uniformly stirring bonding agents and conductive slurry to prepare a slurry mixture; (b) dry powder mixing: uniformly stirring active substances and conductive dry powder to obtain a dry powder mixture; (c) solvent adding and stirring: mixing the slurry mixture and the dry powder mixture; adding solvents; performing uniform stirring to obtain the high-rate lithium ion battery slurry. The bonding agent with the dispersing function and difficult-to-disperse conductive slurry are stirred, mixed and dispersed in advance to obtain a first mixture; particular solid active substances and conductive dry powder which can be easily mixed are mixed together to obtain a second mixture; then, the first mixture and the second mixture are combined and subjected to stirring and mixing together with solvents. By using the method, the prepared lithium ion battery positive electrode slurry can be favorably, sufficiently and uniformly dispersed; the mixing and stirring efficiency is improved, so that the stirring is uniform; the time required by the stirring is reduced; in addition, the high-rate performance of the lithium ion battery positive electrode can be effectively improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a preparation method of high-rate lithium-ion battery slurry. Background technique [0002] As a new type of high-capacity, long-life and environmentally friendly battery, lithium-ion batteries have been widely used in electric bicycles, electric vehicles, electric motorcycles, electric tools, energy storage systems, and 3C products since they were successfully developed in the early 1990s. Compared with nickel-cadmium and nickel-metal hydride batteries, lithium-ion batteries have many advantages such as high specific energy, high working voltage, wide application temperature range, low self-discharge rate, long cycle life, and no pollution. In the production process of lithium-ion batteries, the process design of slurry has a great influence on the performance of lithium-ion batteries. Excellent and reasonable process design can directly improve the electrical pr...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525B01F3/00B01F23/00
CPCH01M4/364H01M4/505H01M4/525H01M4/5825H01M4/623H01M4/625H01M10/0525B01F23/09Y02E60/10
Inventor 何浩远梁凯陈小平
Owner 桑顿新能源科技(长沙)有限公司
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