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Graphene lithium battery anode slurry and preparation method thereof, and fast charge lithium ion battery

A negative electrode slurry, graphene technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limited improvement in fast charging performance of lithium ion batteries, prolonging lithium ion diffusion paths, and hindering lithium ion diffusion, etc. Achieve the effect of optimizing fast charging and fast discharging performance, improving polarization, reducing the depth and stroke of de-embedding

Active Publication Date: 2019-07-12
江苏碳谷二维世界科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to solve the shortcomings of commercial graphite such as high irreversible capacity and voltage hysteresis, CN107579274A discloses a fast-charging graphene lithium battery mobile power supply, and the negative active layer is a carbon nanotube / graphene composite three-dimensional porous structure material; CN105161755A discloses a A method for making a polymer battery that can be charged and discharged at a high current. The negative electrode slurry includes 75% to 80% of graphite, 8% to 10% of graphene, 0.5 to 2% of conductive graphite, 2% to 4% of carbon nanotubes, 4 %~6% polyvinylidene fluoride, the dispersant is non-ionic surfactant
In the above two schemes, by adding two-dimensional or three-dimensional carbon materials, the conductivity of the negative electrode is enhanced and the storage capacity is high, but the sheet-like graphene will hinder the diffusion of lithium ions, thereby prolonging the life of lithium ions. Diffusion path, especially when the current density in the fast charge state is high, so the improvement in the fast charge performance of lithium-ion batteries is limited

Method used

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  • Graphene lithium battery anode slurry and preparation method thereof, and fast charge lithium ion battery

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Experimental program
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Effect test

Embodiment

[0027] Embodiment (abbreviation S) 1-3 and comparative example

[0028] In parts by weight, the composition of the graphene lithium battery negative electrode slurry of embodiment 1-3 and comparative example is shown in the table below:

[0029]

[0030] The graphene in embodiment 1-3 and comparative example is the graphene that mechanical exfoliation method makes, and size is 1~10nm, and specific surface area is 500~1000m 2 / g. The counter cation of quasi-Dawson structure selenotungstate is ethylenediamine.

Embodiment 4-5

[0032] Embodiment 4 is based on embodiment 2. The difference is that the solvent of embodiment 4 is water, and the adhesive is the ME 1209 type emulsion adhesive mentioned in CN 108281656A. 0.8 parts of dispersant fatty alcohol polyoxyethylene ether was also added to the negative electrode slurry.

[0033] Embodiment 5 is based on embodiment 2, and the difference is that the counter cation of quasi-Dawson structure selenotungstate is triethylamine.

[0034] The preparation method of the graphene lithium battery negative electrode slurry of embodiment 1-5 comprises the following steps:

[0035] S1: The conductive agent and the binder are made into a dispersion liquid, and after ball milling and drying, a negative electrode mixed powder is obtained. The time is 5~12h;

[0036] S2: Put the conductive composite powder obtained in S1 into a mold, place it in the cavity of a discharge plasma sintering furnace, and conduct discharge plasma sintering treatment under nitrogen protect...

Embodiment 7

[0045] The fast charging lithium-ion battery of embodiment 7 comprises positive pole piece and negative pole piece, and the solid dry material of positive pole piece and negative pole piece is mainly composed of positive electrode active material, carbon conductive material, binding agent, and the carbon conductive material of positive pole piece All materials include graphene;

[0046] In the solid dry material of the positive pole piece, lithium iron phosphate, graphene, acetylene carbon,

[0047] Zr 0.94 Yb 0.06 W 2 o 8-n (n is determined by the oxygen vacancies brought about by unequal doping), the weight percentages of polyvinylidene fluoride are 96.26%, 1.024%, 1.024%, 0.67%, 1.022%, and the viscosity of the positive electrode slurry is adjusted by a solvent. 6050mPa·s, the positive electrode slurry is coated on the aluminum foil, and the positive electrode sheet is made by drying and pressing, and the positive electrode compaction density is 2.1g / cm 3 ;

[0048] T...

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Abstract

The invention discloses a graphene lithium battery anode slurry. The raw components of the slurry comprise a slurry solvent, graphite, a conductive agent and an adhesive, wherein the conductive agentis graphene or graphene as a main component; the graphene lithium battery anode slurry further comprises a selenium tungstate with a quasi-Dawson structure, the counter cations of the selenium tungstate are protonated ethylenediamine and / or triethylamine; and the selenium tungstate in the anode slurry is sintered or calcined at a temperature above 400 DEG C. Cation pores are formed in polyacid anion clusters of the selenium tungstate through heat treatment to form a large number of lithium active sites so as to facilitate increasing of the embedding amount of lithium ions in the anode solid dry material, reduce the de-embedding depth and the stroke of the lithium ions in the solid dry material, improve the polarization effect of the anode under the condition of high-rate charging, and optimize the quick charging and quick discharging performance of the battery. The present invention further discloses a preparation method of a graphene lithium battery anode slurry and a quick charging and quick discharging lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a graphene lithium battery negative electrode slurry, a preparation method and a fast-charge lithium-ion battery. Background technique [0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as the positive electrode material, graphite as the negative electrode material, and uses a non-aqueous electrolyte solution. During the charging process, the lithium ions in the positive electrode active material diffuse to the negative electrode and enrich, and the discharge process Lithium ions diffuse from the negative electrode to the positive electrode and are embedded in the crystal of the positive active material. [0003] The anode materials of lithium-ion batteries in the prior art can be divided into three categories: intercalation-type anode materials (lithium ions intercalate / extract interlayer gaps, such as graphite), alloyed anode ma...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/62H01M4/624H01M4/625Y02E60/10
Inventor 戴中秋戴剑
Owner 江苏碳谷二维世界科技有限公司