A slurry mixing process for lithium-ion battery composite graphite negative electrode

A lithium-ion battery, composite graphite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low first efficiency, and achieve the effects of improving compaction density, stable performance, and increasing battery capacity

Active Publication Date: 2020-10-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the aforementioned defects in the prior art, the present invention discloses a slurry mixing process for a lithium-ion battery composite graphite negative electrode, which solves the first low efficiency of lithium-ion batteries using graphite negative electrodes and prolongs the life of the battery

Method used

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  • A slurry mixing process for lithium-ion battery composite graphite negative electrode
  • A slurry mixing process for lithium-ion battery composite graphite negative electrode
  • A slurry mixing process for lithium-ion battery composite graphite negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The lithium-ion battery positive pole in the present embodiment adopts NCM622 (LiNi 0.6 co 0.2 mn 0.2 o 2 ), the negative electrode graphite is mixed with natural graphite and artificial graphite, wherein the mass ratio of natural graphite and artificial graphite is 3:7.

[0035] Among them, the negative electrode mixing process adopts the following steps:

[0036] (1) 1.746gCH 3 COOH was added into deionized water and stirred until dissolved to obtain an additive solution;

[0037] (2) 2.06g CMC (carboxymethyl cellulose) is added in the additive solution, is 1.6% to make glue solution according to solid content, and glue solution is divided into two equal parts for subsequent use;

[0038] (3) Add 1.98g of conductive agent SP, 45g of natural graphite and 105g of artificial graphite into half of the glue in step (2), and dry mix to prepare slurry 1;

[0039] (4) Add the other half of the glue in step (2) to the slurry 1 in step (3), and after high-speed dispersion...

Embodiment 2

[0043] The lithium-ion battery positive pole in the present embodiment adopts NCM622 (LiNi 0.8 co 0.1 mn 0.1 o 2 ), the negative electrode graphite is mixed with natural graphite and artificial graphite, wherein the mass ratio of natural graphite and artificial graphite is 4:6.

[0044] Among them, the negative electrode mixing process adopts the following steps:

[0045] (1) 4.41g Add deionized water and stir until dissolved to obtain an additive solution;

[0046] (2) 2.65g CMC is added in the additive solution, is 1.5% to make glue solution by solid content, and glue solution is divided into two equal parts for subsequent use;

[0047] (3) 4.1g of conductive agent SP, 82g of natural graphite and 123g of artificial graphite were added to half of the glue solution in step (2), and after dry mixing, slurry 1 was obtained;

[0048] (4) Add the other half of the glue solution in step (2) to the slurry 1 in step (3), and after high-speed dispersion, prepare slurry 2;

[0...

Embodiment 3

[0052] The lithium-ion battery positive pole in the present embodiment adopts NCM622 (LiNi 0.8 co0.1 mn 0.1 o 2 ), the negative electrode graphite is mixed with natural graphite and artificial graphite, wherein the mass ratio of natural graphite and artificial graphite is 1:9.

[0053] Among them, the negative electrode mixing process adopts the following steps:

[0054] (1) 4.50g Add deionized water and stir until dissolved to obtain an additive solution;

[0055] (2) 3.55g CMC is added in the additive solution, is 1.5% to make glue solution by solid content, and glue solution is divided into two equal parts for subsequent use;

[0056] (3) Add 4.3g of conductive agent SP, 25g of natural graphite and 225g of artificial graphite into half of the glue in step (2), and dry mix to prepare slurry 1;

[0057] (4) Add the other half of the glue solution in step (2) to the slurry 1 in step (3), and after high-speed dispersion, prepare slurry 2;

[0058] (5) Join the 15.46g bin...

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Abstract

The invention discloses a slurry blending process of a composite graphite cathode of a lithium ion battery. The slurry blending process comprises the following steps: adding an additive into deionizedwater, stirring until dissolving, so as to obtain an additive solution; adding a thickening agent into the additive solution so as to prepare a glue solution, and equally dividing the glue solution into two parts for later use; adding a conducting agent and composite graphite into one half of the glue solution, and carrying out dry blending, so as to obtain slurry 1; adding the other half of theglue solution into the slurry 1, carrying out high-speed dispersion, so as to obtain slurry 2; and adding an adhesive into the slurry 2, uniformly dispersing so as to obtain slurry 3, adjusting the viscosity of the slurry 3 within a process range, and discharging. The primary efficiency of the lithium ion battery prepared by virtue of the slurry blending process of the cathode is improved, graphite does not settle in the slurry blending process, the performance of the battery is improved, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a slurry mixing process of composite graphite negative electrodes of lithium ion batteries. Background technique [0002] The negative electrode of the lithium-ion battery is made of a negative electrode active material carbon material or non-carbon material, a conductive agent and a binder mixed to form a paste-like adhesive that is evenly spread on both sides of the copper foil, dried and rolled. The negative electrode material mainly affects the initial efficiency and cycle performance of lithium batteries, which in turn affects the performance of lithium-ion batteries. With the development of lithium-ion batteries in the direction of high specific energy, traditional graphite anode materials are gradually replaced by high specific capacity anode materials such as alloys, metal oxides, and natural graphite. High specific capacity anode materials are prone to lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/0525C01B32/205
CPCC01B32/205H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 李婷婷王光俊张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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