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A battery slurry comprising graphene/cellulose composite material and its preparation method and application

A composite material and cellulose technology, applied in battery electrodes, battery pack components, circuits, etc., can solve the problems of low energy density and theoretical capacity of lithium-ion batteries, increased equipment investment and energy consumption, and difficulty in charging and discharging batteries. , to achieve the effect of inhibiting the growth of dendrites, long-term placement without sedimentation, and small particle size

Active Publication Date: 2020-10-30
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The uniform effect of the slurry prepared by the above method is not the same, but in general, the adhesive colloids are easy to form agglomerated particles of different sizes in the process of preparing the slurry by the first method, which affects the consistency of the slurry. Uniformity; in the second method, the preparation of the glue is time-consuming and takes up storage equipment, which increases equipment investment and energy consumption, affects production efficiency, and when the glue is mixed with the conductive agent, the long-term mixing of the two Uniform contact will form a stable structure, which is difficult to disperse and affects the uniformity of the slurry
[0005] Not only that, the energy density and theoretical capacity of the lithium-ion battery prepared by the slurry prepared by the current technology are relatively low, which can no longer meet people's needs. It is difficult to achieve a more ideal balance in the balance of electronic conductivity, and it is difficult for the prepared battery to achieve a higher rate of charge and discharge and maintain a stable structure.

Method used

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  • A battery slurry comprising graphene/cellulose composite material and its preparation method and application
  • A battery slurry comprising graphene/cellulose composite material and its preparation method and application
  • A battery slurry comprising graphene/cellulose composite material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Step 1) fully mix 35g of natural flake graphite and 100g of methylcellulose, and ball mill for 5h at room temperature to obtain graphene / cellulose composite material powder;

[0079] Step 2) Sodium dodecylbenzene sulfonate 2g is dissolved in 58g water, then the graphene cellulose material 20g obtained in step 1) is dissolved in the above-mentioned water, fully stirred;

[0080] Step 3) Add 5g of alumina with a particle diameter of about 500nm in the mixing system of step 2), add 15g of PMMA with a particle diameter of about 300nm, and fully ball mill and mix to obtain a lithium-ion battery comprising graphene / cellulose composite material with slurry;

[0081] In the lithium ion battery slurry comprising graphene / cellulose composite material, the mass percentage of graphene / cellulose mixed material is 20wt%; the mass percentage of water is 58%, and the mass percentage of surfactant is The percentage is 2wt%; the mass percentage of inorganic micro-nano particles is 5wt%, a...

Embodiment 2

[0092] The preparation method of described lithium ion battery is the same as embodiment 1, and the only difference is that,

[0093] Step 1) 55g of natural flake graphite and 100g of cellulose acetate are fully mixed, and ball milled at room temperature for 5h, the graphene / cellulose composite material powder can be obtained;

[0094] Step 2) dissolving 0.1 g of methyl amyl alcohol in 91.9 g of water, then dissolving 2 g of the graphene cellulose material obtained in step 1) in the above-mentioned water, fully stirring;

[0095] Step 3) Add 1g of titanium dioxide with a particle diameter of about 500nm in the mixing system of step 2), add 5g of PMMA with a particle diameter of about 300nm, and fully ball mill and mix to obtain a lithium-ion battery comprising graphene / cellulose composite material slurry;

[0096] In the lithium-ion battery slurry comprising graphene / cellulose composite material, the mass percentage of graphene / cellulose mixed material is 2wt%; the mass perce...

Embodiment 3

[0099] The preparation method of described lithium ion battery is the same as embodiment 1, and the only difference is that,

[0100] Step 1) fully mix 15g of crystalline graphite and 100g of cellulose acetate, and ball mill for 5h at room temperature to obtain graphene / cellulose composite material powder;

[0101] Step 2) dissolving methyl amyl alcohol 5g in 70g water, then dissolving 15g of the graphene cellulose material obtained in step 1) in the above-mentioned water, fully stirring;

[0102] Step 3) adding 10g of titanium dioxide with a particle diameter of about 500nm in the mixing system of step 2), and fully mixing by ball milling to obtain a slurry for lithium ion batteries comprising graphene / cellulose composite materials;

[0103] In the lithium ion battery slurry comprising graphene / cellulose composite material, the mass percentage of graphene / cellulose mixed material is 15wt%; the mass percentage of water is 70wt%, and the mass percentage of dispersant The conte...

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Abstract

The invention discloses a battery slurry containing a graphene / cellulose composite material, and a preparation method and application thereof. The battery slurry comprises the following components: (a) the graphene / cellulose composite material; (b) water; and (c) at least one selected from the group consisting of a surfactant and a dispersant. The battery slurry further comprises at least one selected from the following components: (d) inorganic micro-nano particles; and (e) organic micro-nano particles. A lithium ion battery prepared from the slurry can realize high-rate charging and discharging, and the slurry enables the lithium ion battery to have high capacity and long service life. When the slurry coats the surface of a negative electrode or coats the surface, facing the negative electrode, of a diaphragm, the slurry can effectively inhibit the growth of dendritic crystals. In use of the diaphragm containing the graphene / cellulose composite material, a preparation method for thediaphragm is simple in process, mild in reaction conditions, short in production cycle, and capable of realizing large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a slurry for lithium ion batteries containing a graphene / cellulose composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries generally use materials containing lithium elements as electrodes, which are representatives of modern high-performance batteries. It is favored by researchers for its small size, light weight, high working voltage, high specific energy, long cycle life, and no pollution. It can be widely used in various fields of aerospace, electronic devices and daily life. Lithium-ion batteries currently used are generally composed of positive and negative electrodes, electrolytes and separators, and slurry often plays an important role in the preparation and use of lithium-ion batteries. This is because in lithium-ion batteries, both The battery core is obtained after winding the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M4/62H01M4/505H01M4/525H01M4/583
CPCH01M4/505H01M4/525H01M4/583H01M4/62H01M50/40H01M50/411H01M50/44Y02E60/10
Inventor 周建军胡志宇李林方芳
Owner BEIJING NORMAL UNIVERSITY