Graphene lithium battery cathode slurry and preparation method thereof, and lithium battery positive plate

A technology of positive electrode slurry and positive electrode sheet, applied in the direction of graphene, electrode manufacturing, battery electrodes, etc., can solve the problems of battery rate performance decrease, lithium ion diffusion resistance increase, prolong lithium ion diffusion path, etc., and achieve good electrical conductivity and the effect of thermal conductivity

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

AI Technical Summary

Problems solved by technology

However, there are the following technical problems in the test: the sheet structure of graphene will hinder the diffusion of lithium ions, thereby prolonging the diffusion path of lithium ions, which will increase the diffusion resistance of lithium ions, and then cause the rate performance of the battery to decrease

Method used

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  • Graphene lithium battery cathode slurry and preparation method thereof, and lithium battery positive plate
  • Graphene lithium battery cathode slurry and preparation method thereof, and lithium battery positive plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0030] Embodiment (abbreviation S) 1-3 and comparative example

[0031] In parts by weight, the composition of the lithium battery cathode slurry of Examples 1-3 and comparative examples is shown in the table below:

[0032]

[0033]

Embodiment 4

[0035] Embodiment 4-5 is based on embodiment 3, the difference is that the negative thermal expansion material of embodiment 4 is ytterbium doped ZrW 2 o 8 , Zr 0.94 Yb 0.06 W 2 o 8-n (n is determined by the oxygen vacancies brought by unequal doping); Example 5 uses aluminum ion doping ZrW 2 o 8 , the aluminum doping amount is 3.2%.

[0036] The graphene used in Examples 1-5 and Comparative Examples is mechanically exfoliated graphene with few structural defects and an aspect ratio of not less than 500.

Embodiment 3

[0037] Example 3 sets up Example 3-A and Example 3-B side by side. Group A samples are physically blended, according to nitrogen methyl pyrrolidone, polyvinylidene fluoride, carbon conductive material, negative thermal expansion material, phosphoric acid Sequential feeding of iron lithium, high-speed stirring to disperse evenly. Embodiment and comparative example adopt following B group processing steps:

[0038] S1: Carbon conductive materials and negative thermal expansion materials are mixed with ethanol to make a dispersion, and then the dispersion is placed in a ball mill tank for ball milling to remove polar organic solvents, and the solid components in the dispersion are dried and sieved to obtain Conductive mixed powder, wherein the ball-to-material ratio of the ball to the powder in the dispersion is 1:1.2, the weight ratio of the powder to the polar organic solvent in the dispersion is 1:2.5, and the ball milling time is 24 hours;

[0039]S2: Put the conductive mixe...

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Abstract

The invention discloses a graphene lithium battery cathode slurry. The raw materials of the slurry comprises a cathode active material, a conductive agent, a binder and N-methyl pyrrolidone, wherein the conductive agent is composed of a carbon conductive material and a negative thermal expansion material, the carbon conductive material comprises graphene, and the negative thermal expansion material is ZrW2O8 and / or ZrW2O8 doped with heterogeneous metal ions. The negative thermal expansion material ZrW2O8 and / or the ZrW2O8 doped with heterogeneous metal ions is added into the lithium battery cathode slurry, in the charge-discharge state, the temperature of the battery rises, the cathode active material is heated and expanded, the micro cracks in the negative thermal expansion material and contraction gaps between the negative thermal expansion material and the cathode active material and the carbon conductive material are increased, the lithium ion diffusion paths are increased, the diffusion capacity of lithium ions in the cathode is improved, and the rate capability of the battery is improved. The invention also discloses a preparation method of the graphene lithium battery cathode slurry and a lithium battery positive plate.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a graphene lithium battery positive electrode slurry, a preparation method and a lithium battery positive electrode sheet. Background technique [0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as the positive electrode material and uses a non-aqueous electrolyte solution. During charging, the active material of the positive electrode material undergoes a phase transition reaction under potential conditions, and lithium ions are released from the crystal structure of the positive electrode material. Gradually escape from the crystal, transfer to the negative electrode material through the electrolyte and embed it, at the same time, electrons also escape from the inside of the crystal, and transfer to the negative electrode through the external circuit. The discharge process is the opposite of the charge process. The crystal structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/04H01M10/42H01M4/36H01M4/583C01B32/182H01M10/0525
CPCH01M4/62H01M4/0402H01M10/4235H01M4/362H01M4/583H01M4/625C01B32/182H01M10/0525Y02E60/10
Inventor 戴中秋戴剑
Owner 江苏碳谷二维世界科技有限公司
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