High-energy density lithium ion battery cell and preparation method thereof

A lithium-ion battery and cell technology, applied in the manufacture of electrolyte batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as thermal deformation, poor battery rate performance, and lack of ionic conductivity.

Active Publication Date: 2013-05-08
BEIJING HAWAGA POWER STORAGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In liquid lithium-ion batteries, the diaphragm is basically made of polymer film, such as PE, PP, PP / PE / PP, etc., which are generally several to tens of microns, and are prone to problems such as penetration, rupture, and thermal deformation. Internal short circuit causes battery safety issues
Doping inorganic powders in polymers to prepare inorganic / organic composite diaphragms can solve this problem, but most of the inorganic powders are silica, magnesia, alumina, etc., which do not have ion conductivity, which affects the lithium ion of the diaphragm. Passing rate
[0007] The separator of the all-solid-state lithium-ion battery uses a solid-state electrolyte, which has greater puncture resistance and better thermal stability, but the ionic conductivity of the solid electrolyte is low, and the battery rate performance is poor. In addition, the battery production cost also high

Method used

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  • High-energy density lithium ion battery cell and preparation method thereof
  • High-energy density lithium ion battery cell and preparation method thereof
  • High-energy density lithium ion battery cell and preparation method thereof

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preparation example Construction

[0071] The preparation process of the above-mentioned high energy density lithium-ion battery cell is as follows: Image 6As shown, it includes: cleaning the substrate film 17→preparing each coating to obtain a battery cell group 18→edge heat sealing and punching to obtain the single battery cell 19 to be injected→liquid injection and tail heat sealing to obtain the battery to be injected Trim the single cell 20 → trim to obtain the high energy density lithium-ion battery cell 21 .

[0072] In the above preparation process, the structure of the liquid-injected monomer cell 19 obtained through edge heat sealing and punching is as follows: Figure 7 As shown, it includes a liquid injection port 22, a heat-sealed edge 23 and a region 24 to be heat-sealed. The structure of the single battery cell 20 to be trimmed after being heat-sealed at the tail is as follows: Figure 8 As shown, the tail 25 is relatively long, and it is trimmed from b-b to make it a moderate length, so as to...

Embodiment 1

[0074] Prepare high energy density lithium-ion battery cells according to the following steps:

[0075] 1) Cleaning of the base film

[0076] A PP / aluminum composite matrix film with a thickness of 80 μm is pulled into the spray chamber, sprayed with acetone for 4 minutes to remove oil stains.

[0077] 2) Preparation of composite positive electrode layer

[0078] a. Preparation of positive electrode active layer: lithium nickel manganese cobalt oxide LiNi 5 / 10 co 2 / 10 mn 3 / 10 o 2 , carbon black powder, LA132 water-based binder and deionized water are uniformly mixed into a slurry according to a certain ratio, and sieved to obtain a positive electrode slurry, wherein lithium nickel manganese cobalt oxide: carbon black powder: LA132 water-based binder The mass ratio of the mixture is 85:8:7, and the solid content of the prepared positive electrode slurry is 9%; the composite film obtained in step 1) is drawn to the positive electrode spraying area, and the positive electrod...

Embodiment 2

[0121] In this embodiment, 10 positive electrode layers and 10 negative electrode layers are combined, and the others are the same as the first embodiment.

[0122]A high energy density lithium-ion battery cell II of the present invention was prepared by the above method, and the relevant performance parameters are listed in Table 1.

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Abstract

The invention discloses a high-energy density lithium ion battery cell and a preparation method thereof. The cell comprises a matrix layer, a composite positive electrode layer, a composite diaphragm layer, a composite negative electrode layer, an isolation layer and an positive electrode / negative electrode collector region, wherein a fast lithium ion conductor is doped in the composite diaphragm layer, so that the ion conductivity of the cell is improved, better thermal stability and puncture-resistant strength can be achieved, and the security of a battery can be improved; and the composite positive electrode / negative electrode layers adopt a three-layer sandwich structure of an positive electrode / negative electrode activity layer, a conductive layer and an positive electrode / negative electrode activity layer in sequence, the conductive layer is formed by alternatively arranging conductive fiber of carbon fiber, carbon nanotubes and the like, so that not only can the coating strength be enhanced so as to prevent the breakage of the coating, but also the conductivity of the coating can be increased. According to high-energy density lithium ion battery cell and the preparation method thereof, the spraying technology, novel afflux technology and fast lithium ion conductor materials are simultaneously used and organically combined, so that the energy density and the charging and discharging rate of the cell can be greatly improved, the preparation cost can be greatly lowered, and the technique is simple and easy for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to lithium-ion battery cells and a preparation method thereof. Background technique [0002] Lithium-ion batteries were developed in the 1990s and began to be commercialized. Its appearance can be regarded as a leap in the history of secondary batteries. In the following ten years, its commercialization process has made rapid progress. development of. The scope of application of lithium-ion batteries has also been continuously expanded. From the information industry to energy transportation, from space to underwater, lithium-ion batteries have entered various fields of human society. [0003] Lithium-ion secondary batteries have the advantages of high specific capacity, high operating voltage, wide operating temperature range, low self-discharge rate, long cycle life, no memory effect, no pollution, light weight, and good safety performance, so they are widely used in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M2/16
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 陈永翀李琪张萍韩立王秋平
Owner BEIJING HAWAGA POWER STORAGE TECH
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