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A kind of lithium ion battery pole piece and preparation method thereof

A lithium ion battery and pole piece technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of slow Li ion diffusion, low soft carbon crystallinity, and large interplanar spacing, and achieve good lithium ion Ion conduction characteristics, electron conductivity improvement, effect of reducing migration path

Active Publication Date: 2020-10-09
ANHUI ZHENGXIBIAOWANG NEW ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage is that the graphite material has poor structural stability, poor compatibility with the electrolyte, and the slow diffusion rate of Li ions in its ordered layered structure, which makes the material unable to charge and discharge at a high rate.
However, soft carbon has low crystallinity, small grain size, large interplanar spacing, and good compatibility with the electrolyte, but the irreversible capacity for the first charge and discharge is good, and the application range is small. The above artificial graphite is used as the negative electrode material of lithium-ion batteries. Some structural defects, in order to obtain anode materials with high electrochemical performance, it is necessary to carry out further surface modification and modification

Method used

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  • A kind of lithium ion battery pole piece and preparation method thereof
  • A kind of lithium ion battery pole piece and preparation method thereof

Examples

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Embodiment 1

[0039] A method for preparing a lithium-ion battery pole piece, comprising 75kg of positive electrode / negative electrode active material, 2kg of pore-forming agent, 2.5kg of conductive agent, 1.5kg of adhesive, and 50kg of solvent;

[0040] And prepare described lithium-ion battery pole piece through the following steps:

[0041] (1) prepare positive electrode active material and negative electrode active material;

[0042] (2) Mix the positive electrode / negative electrode active material in step (1) with pore-forming agent, conductive agent, binder and solvent respectively, and prepare slurry A and slurry B;

[0043] (3) The slurries A and B in the step (2) are coated on the current collector, dried at 50-55°C, 65-75°C, 80-85°C, and 75-80°C, and rolled, cutting to obtain the lithium ion battery pole piece.

[0044] In this embodiment, the pore-forming agent is polystyrene balls, the particle size of the pore-forming agent is ≤2.0um, the conductive agent is acetylene black, ...

Embodiment 2

[0065] The content of this example is basically the same as that of Example 1, and the similarities will not be repeated. The difference is that it includes 70 kg of positive / negative active materials, 1 kg of pore-forming agent, 2 kg of conductive agent, 1 kg of binder, and 40 kg of solvent.

Embodiment 3

[0067] The content of this example is basically the same as that of Example 1, and the similarities will not be repeated. The difference is that it includes 80kg of positive electrode / negative electrode active material, 3kg of pore-forming agent, 3kg of conductive agent, 2kg of adhesive, and 60kg of solvent.

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Abstract

The invention relates to the technical field of a lithium ion battery electrode material, in particular to a lithium ion battery electrode plate and a preparation method thereof. The lithium ion battery electrode plate is prepared from 70 to 80 parts of positive electrode / negative electrode active substances, 1 to 3 parts of pore forming agents, 2 to 3 parts of conducting agents, 1 to 2 parts of bonding agents and 40 to 60 parts of solvents. Therefore during the positive active substance preparation, carbon nanometer tubes and graphene are used as modified additives to from a structure with lithium iron phosphate positive electrode materials at the inside and amorphous carbon coated at the outside. On one hand, through the addition of graphene and carbon nanometer tubes, the transition lithium iron phosphate activation is facilitated; the lithium iron phosphate can prevent the aggregation of the graphene and the carbon nanometer tubes; the uniform and stable modified lithium iron phosphate can be more easily obtained; on the other hand, the lithium iron phosphate can form rich-lithium compounds in the discharging process; good ion conductivity is realized; meanwhile, the rich-lithium compounds can realize the modification on the surface structure of the lithium phosphate, so that the electron electric conductivity on the surface of the lithium phosphate can be improved.

Description

Technical field: [0001] The invention relates to the technical field of lithium-ion battery electrode materials, in particular to a lithium-ion battery pole piece and a preparation method thereof. Background technique: [0002] A lithium battery is a primary battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. It is different from a rechargeable battery. Lithium-ion batteries are different from lithium-ion polymer batteries. The inventor of the lithium battery is Edison. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of microelectronics technology at the end of the 20th century, miniaturized equipment is increasing day by day, which puts forward high requirements for power supply. Lithium batteries have enter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/58H01M4/62
CPCH01M4/13H01M4/139H01M4/5825H01M4/625Y02E60/10
Inventor 丘焕山
Owner ANHUI ZHENGXIBIAOWANG NEW ENERGY CO LTD