Negative electrode paste mixing process with pre-lithiation effect, and lithium battery

A negative electrode slurry and pre-lithiation technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex lithium supplementation process, poor lithium supplementation effect, and potential safety hazards, so as to improve safety and conductivity , enhance the effect of conductive type

Active Publication Date: 2018-08-17
江西安驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of complex lithium supplementation process in the prior art, high cost, potential safety hazards, and poor lithium supplementation effect, the present invention provides a negative electrode slurry mixing process with pre-lithiation effect

Method used

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  • Negative electrode paste mixing process with pre-lithiation effect, and lithium battery
  • Negative electrode paste mixing process with pre-lithiation effect, and lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A negative electrode slurry mixing process with pre-lithiation effect, which is produced by the following stirring process, the process includes:

[0037] (1) Put 17kg of artificial graphite, 0.51kg of SP, 0.51kg of PVDF and other powders into the mixing tank together, set the stirring speed to 30 rpm, the dispersion speed to 500 rpm, and dry mix for 20 minutes; (2) Add 1.7kg CNT conductive paste, set the stirring speed to 15 rpm, the dispersion speed to 500 rpm, and stir for 30 minutes; (3) Add 6.5kg NMP, set the stirring speed to 30 rpm, and the dispersion speed to 1500 rpm, Stir for 80 minutes; (4) Add 7kg of NMP, set the stirring speed to 35 rpm, disperse at 2000 rpm, and stir for 80 minutes; (5) Add 2kg of electrolyte (1 mol / L concentration of LiPF 6 , 1.5% VC and 1.5% PS dissolved in a mixed solvent of ethylene carbonate / dimethyl carbonate / methyl ethyl carbonate to make an electrolyte) and 0.2kg metal lithium sheet, set the stirring speed to 35 rpm, The dispersio...

Embodiment 2

[0047] A negative electrode slurry mixing process with pre-lithiation effect, which is produced by the following stirring process, the process includes:

[0048] (1) Put 17kg of artificial graphite, 0.51kg of SP, 0.51kg of PVDF and other powders into the mixing tank together, set the stirring speed to 30 rpm, the dispersion speed to 500 rpm, and dry mix for 20 minutes; (2) Add 1.7kg CNT conductive paste, set the stirring speed to 15 rpm, the dispersion speed to 500 rpm, and stir for 30 minutes; (3) Add 6.5kg NMP, set the stirring speed to 30 rpm, and the dispersion speed to 1500 rpm, Stir for 80min; (4) Add 7kg of NMP, set the stirring speed to 35 rpm, disperse at 2000 rpm, and stir for 80min; (5) Add 1.7kg of electrolyte (1 mol / L concentration of LiPF6, 1.5%VC and 1.5% PS dissolved in a mixed solvent of ethylene carbonate / dimethyl carbonate / methyl ethyl carbonate to make an electrolyte) and 0.306 kg metal lithium sheet, set the stirring speed to 35 rpm, and the dispersion spe...

Embodiment 3

[0050] The difference from Example 1 is that in step (5), 0.85 kg of electrolyte (1 mol / liter concentration of LiPF6, 1.5% VC and 1.5% PS dissolved in ethylene carbonate / dimethyl carbonate / methyl ethyl carbonate The electrolyte is prepared in a mixed solvent of base ester).

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Abstract

The invention relates to a negative electrode paste mixing process with a pre-lithiation effect, and a lithium battery. In an environment with a dew point of minis 40 to minus 50 DEG C, a negative electrode active material, a conductive agent and other dry powder are stirred uniformly; next, conductive paste is added and then added into NMP in two times to be kneaded and mixed uniformly; and finally, a metal lithium sheet and a film-forming additive-containing electrolyte are added to carry out dispersion and pre-lithiation. The metal lithium sheet and the film-forming additive-containing electrolyte are added in the paste mixing process, so that quantification of the metal lithium sheet can be facilitated, formation of an SEI membrane can be promoted, and an obvious lithium supplementingeffect is realized; pre-lithiation is performed directly in the paste mixing process, and extra pre-lithiation equipment is not needed, so that production cost is lowered; and in the subsequent electrolyte injection of the lithium battery, the content of the additive in the electrolyte can be reduced, and electrical conductivity of the electrolyte can be improved, thereby improving safety, initialefficiency, rate capability and cycle performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of new energy electric vehicles, and more specifically, the invention relates to a negative electrode slurry mixing process and a lithium battery with a pre-lithiation effect. Background technique [0002] The current important direction of lithium-ion battery development is to further increase the specific energy of the battery, mainly through the optimization of the battery structure and the use of new electrode materials with higher energy density. During the first charging process of the battery, lithium ions are deintercalated from the positive electrode and enter the negative electrode, and then come out from the negative electrode and enter the positive electrode during the discharge process. This process is also called the "rocking chair reaction process". In this process, the capacity of the positive electrode material will decay by about 5% to 15%. This is due to the formation of a solid electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1393H01M10/0525
CPCH01M4/04H01M4/1393H01M10/0525Y02E60/10
Inventor 陈淑青钟华郭娜娜曹文平白科
Owner 江西安驰新能源科技有限公司
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