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Preparation method of polymer lithium battery positive electrode preparation materials

A technology of lithium batteries and polymers, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor consistency in the roll process, the inability to obtain a dispersed state, and the small friction of slurry particles, etc., to achieve good lithium Ion de-intercalation channel, uniform and dense contact, low impedance effect

Inactive Publication Date: 2018-08-31
湖南庆胜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

The charging and discharging process of polymer lithium-ion batteries can be regarded as the deintercalation movement of lithium ions between the positive and negative electrode materials, and the preparation of the positive and negative electrode materials will affect the deintercalation of lithium ions in the positive and negative electrode materials, thereby affecting the performance of the battery. performance
At present, the traditional method of preparing positive electrode ingredients is to add NMP solvent at one time. The viscosity of the slurry in the traditional method decreases rapidly, and the friction between the slurry particles is very small, so it is impossible to obtain a good dispersion state, and the consistency of the electrode sheet in the subsequent coating process And the compactness of the roller process is poor, thus affecting the performance of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method for a positive electrode ingredient of a polymer lithium battery, characterized in that it comprises the steps of:

[0021] (1) Solvent and batching components are weighed by weight percentage: NMP solvent 20% and batching 80%, in the described batching, active material accounts for 95%, PVDF glue accounts for 2.0%, CNTs conductive agent accounts for 1.0%, S-O Conductive graphite accounts for 0.5%, Super-P conductive agent accounts for 1.5%;

[0022] (2) Clean the mixing tank, add all the PVDF glue taken by weighing in the mixing tank;

[0023] (3) adding 40% of the NMP solvent, all Super-P conductive agents, and all CNTs conductive agents to the stirring tank in step (2) successively;

[0024] (4) Stir the mixture obtained in step (3) with a stirring tank for 30 minutes, revolution rpm30±2, rotation rpm40±2, temperature T<50°;

[0025] (5) Add all the S-O conductive graphite weighed into the stirring tank, stir for 60 minutes, revolution rpm30±2,...

Embodiment 2

[0034] A preparation method for a positive electrode ingredient of a polymer lithium battery, characterized in that it comprises the steps of:

[0035] (1) Solvent and batching components are weighed by weight percentage: NMP solvent 40% and batching 60%, in the described batching, active material accounts for 97%, PVDF glue accounts for 1.0%, CNTs conductive agent accounts for 1.0%, S-O Conductive graphite accounts for 0.5%, Super-P conductive agent accounts for 0.5%;

[0036] (2) Clean the mixing tank, add all the PVDF glue taken by weighing in the mixing tank;

[0037] (3) adding 40% of the NMP solvent, all Super-P conductive agents, and all CNTs conductive agents to the stirring tank in step (2) successively;

[0038] (4) Stir the mixture obtained in step (3) with a stirring tank for 30 minutes, revolution rpm30±2, rotation rpm40±2, temperature T<50°;

[0039] (5) Add all the S-O conductive graphite weighed into the stirring tank, stir for 60 minutes, revolution rpm30±2,...

Embodiment 3

[0048] A preparation method for a positive electrode ingredient of a polymer lithium battery, characterized in that it comprises the steps of:

[0049] (1) Solvent and batching components are weighed by weight percentage: NMP solvent 50% and batching 50%, in the described batching, active material accounts for 96%, PVDF glue accounts for 2.0%, CNTs conductive agent accounts for 1.0%, S-O Conductive graphite accounts for 0.5%, Super-P conductive agent accounts for 0.5%;

[0050] (2) Clean the mixing tank, add all the PVDF glue taken by weighing in the mixing tank;

[0051] (3) adding 40% of the NMP solvent, all Super-P conductive agents, and all CNTs conductive agents to the stirring tank in step (2) successively;

[0052] (4) Stir the mixture obtained in step (3) with a stirring tank for 30 minutes, revolution rpm30±2, rotation rpm40±2, temperature T<50°;

[0053] (5) Add all the S-O conductive graphite weighed into the stirring tank, stir for 60 minutes, revolution rpm30±2,...

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Abstract

The invention discloses a preparation method of polymer lithium battery positive electrode preparation materials. The preparation method is characterized in that a preparation method of positive electrode paste is changed by adopting a mode of adding an NMP solvent successively, comprising change of paste viscosity, stability, fluidity and the like in the process. The preparation method has the beneficial effects as follows: the sequent coating process is convenient; the particles of a pole piece after a rolling process is performed are more uniform in contact and compact; a better lithium deintercalation channel is formed; and relatively low battery polarization, higher battery hardness, lower battery impedance, higher battery circularity and higher rate capability are macroscopically represented.

Description

technical field [0001] The invention relates to the field of lithium battery manufacturing, in particular to a preparation method for a positive electrode ingredient of a polymer lithium battery. Background technique [0002] Polymer lithium-ion batteries are composed of five main materials: positive electrode material, negative electrode material, tabs, electrolyte and separator. The charging and discharging process of polymer lithium-ion batteries can be regarded as the deintercalation movement of lithium ions between the positive and negative electrode materials, and the preparation of the positive and negative electrode materials will affect the deintercalation of lithium ions in the positive and negative electrode materials, thereby affecting the performance of the battery. performance. At present, the traditional method of preparing positive electrode ingredients is to add NMP solvent at one time. The viscosity of the slurry in the traditional method decreases rapidly...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/60
CPCH01M4/364H01M4/602Y02E60/10
Inventor 曹长春黄加胜
Owner 湖南庆胜新能源科技有限公司