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Manufacturing method of lithium ion battery containing gel electrolyte

A gel electrolyte and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of high-current charge-discharge performance and low-temperature charge-discharge performance deterioration, poor conductivity, battery capacity decline, etc., to achieve excellent charge-discharge performance, high Effect of initial voltage and discharge capacity

Active Publication Date: 2013-03-27
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, batteries using gel electrolytes also have their disadvantages: the electrolyte cannot fully wet the active material of the pole piece, and the conductivity of its own lithium ions is worse than that of the liquid electrolyte, so that lithium ions cannot fully flow between the cathode and the anode. Free migration, so that the capacity of the battery will decrease, and the performance of high-current charging and discharging and low-temperature charging and discharging will also be deteriorated, which cannot meet the application requirements
Although the gel electrolytes prepared by these methods have higher ionic conductivity, they are all worse than liquid electrolytes, and the performance of lithium-ion batteries using corresponding gel electrolytes still cannot reach the design goals very well, and cannot fully meet the requirements. Application requirements
And there may be a problem: there are uneven small pieces of glue between the battery cell and the packaging material, or there are small pieces of glue on the side of the battery cell, these glue pieces will affect the appearance of the battery, and may affect the quality of the battery. encapsulation
[0008] In addition, the Chinese patent application with the application number CN01111388.X and the name of the manufacturing method of the gel electrolyte battery proposes a manufacturing method of the gel electrolyte battery. The performance of the battery can almost meet the application requirements, but the preparation The method is very high on equipment and environment

Method used

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  • Manufacturing method of lithium ion battery containing gel electrolyte
  • Manufacturing method of lithium ion battery containing gel electrolyte
  • Manufacturing method of lithium ion battery containing gel electrolyte

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preparation example Construction

[0050] (2) Preparation of anode electrode sheet: According to the battery design, add the anode active material, conductive agent and binder into the solvent (such as water) in a certain proportion, disperse evenly, form a uniform cathode slurry, and then evenly coat Or rolled onto the anode current collector, then dried and rolled, and finally, an anode tab 6 is welded on the part of the anode current collector not covered with the anode slurry, and the contact between the anode tab 6 and the packaging material layer 8 is covered with a sealant 7 Wrapping to obtain the anode pole piece.

[0051] (3) Assembly of battery cells: the prepared cathode pole piece and anode pole piece are separated by a microporous separator plate 2 to form a laminated structure, and the battery core is formed by winding or stacking.

[0052] (4) Encapsulation of the electric core: place the prepared electric core in the packaging material layer 8, and perform sealing and encapsulation by means of t...

Embodiment 1

[0060] The first step, the preparation of microporous isolation membrane plate 2: dissolve methyl acrylate in deionized water to form a uniform solution, and then add liquid-absorbing polyvinylidene fluoride, wherein the mass ratio of methyl acrylate to polyvinylidene fluoride is 1 / 4, in the process of dispersing polyvinylidene fluoride, a small amount of co-solvent chloroform is added, and after a uniform solution is formed, nano-alumina powder with a particle size of 10nm~50nm is added, and nano-alumina powder and polyvinylidene fluoride The mass ratio is 1 / 1, the dispersion is uniform, and a uniform emulsion is formed. The mass ratio of methyl acrylate to the uniform emulsion is 1%, and then the obtained uniform emulsion is evenly sprayed on the matrix polymer film polyethylene film, and the solvent water dry to obtain the microporous isolation membrane plate 2.

[0061] The second step is the preparation of the cell.

[0062] (1) Preparation of the cathode sheet: LiCoO as...

Embodiment 2

[0073] The difference between Example 2 and Example 1 is that the raw material used to prepare the crosslinked body of the gel electrolyte is ethyl acrylate, the absorbent is polyacrylonitrile, and the mass ratio of ethyl acrylate to polyacrylonitrile It is 3 / 10, the solvent in the first step is acetone, and the mass percentage that ethyl acrylate accounts for the total mass of the homogeneous solution of the first step is 1%, the cosolvent is toluene, and the mass percentage that the initiator accounts for the liquid electrolyte is 0.5% . Others are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of a lithium ion battery, and particularly relates to a manufacturing method of a lithium ion battery containing gel electrolyte. The manufacturing method comprises the steps of preparation of a micro-pore isolating diaphragm plate, preparation of a cell, pouring of the electrolyte, after-treatment and the like. Compared with the prior art, the manufacturing method provided by the invention adopts a two-step method to polymerize gel; a good cathode pole sheet / electrolyte interface and a good anode pole sheet / electrolyte interface are formed on the cell by a pre-gelling step; in a formation process, a cathode activity material and an anode activity material can be sufficiently activated; the lithium ion battery is pressurized in a heating process after the formation is completed, so that air bubbles generated in the formation process of the battery and existing between the cathode pole sheet / electrolyte interface and the anode pole sheet / electrolyte interface can be removed; and an interface gap can be smaller, thereby being beneficial to the generation of the cathode pole sheet / electrolyte interface and the anode pole sheet / electrolyte interface. Therefore, the battery has better electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a method for manufacturing a lithium ion battery containing gel electrolyte. Background technique [0002] Lithium-ion batteries are currently the most advanced commercial secondary batteries in the world. With the development of various electronic products, the demand for lithium-ion batteries in these electronic products is showing a trend of rapid growth. The high discharge voltage, high energy density and excellent low self-discharge characteristics of lithium-ion batteries have made them widely used. [0003] With the development of electronic technology, electronic products have become smaller and lighter, which also puts forward higher requirements for secondary power sources: higher energy density, higher power density and better safety performance, and also requires The secondary power supply can be made into different shapes according to the electronic pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 钟松材
Owner DONGGUAN AMPEREX TECH
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