Lithium battery composite diaphragm as well as preparation method and application thereof

A composite diaphragm and lithium battery technology, which is applied to lithium batteries, secondary batteries, battery pack components, etc., can solve the problems of battery material damage and difficulty in ensuring battery safety, and achieve improved stability, good stability, and halogen The effect of low content

Pending Publication Date: 2022-05-10
BEIJING WELION NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there are some problems with the above types of coated separators: in the process of thermal runaway of the battery, the continuous reaction between the negative electrode and the electrolyte is the inducing factor of thermal runaway, and the oxygen evolution of the positive electrode material diffuses to the negative electrode and undergoes a violent reaction, which is the cause of the thermal runaway of the battery. Major source of intense heat release
At this time, the heat accumulated and released inside the battery has already caused damage to the battery material, and the safety of the battery is difficult to guarantee.

Method used

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  • Lithium battery composite diaphragm as well as preparation method and application thereof
  • Lithium battery composite diaphragm as well as preparation method and application thereof
  • Lithium battery composite diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] A preparation method of lithium battery composite diaphragm,

[0124] (1) Add 0.5 parts by weight of dispersant sodium polyacrylate to solvent water, stir thoroughly, then add 100 parts by weight of oxide solid electrolyte particles LiHAl(PO 4 )O 0.95 f 0.1 , the particle size is 600nm, the ball mill is uniform, and slurry A is prepared, and then continue to add 1 weight part of thickener sodium carboxymethyl cellulose, 5 weight parts of binder polyacrylate and 0.4 weight part of wetting agent sodium perfluorooctanoate, Solid electrolyte accounted for 94wt%, fully stirred to prepare slurry B;

[0125] (2) Slurry B is scraped and coated on a polyethylene-based film with aluminum oxide coating on both sides by a micro-gravure coating machine, baked at 40°C for 2 minutes to form an oxide solid electrolyte coating, and wound to obtain the composite Diaphragm, the structure is shown as figure 1 shown.

[0126] The lithium battery composite diaphragm prepared by the abov...

Embodiment 2

[0135] The solid electrolyte particles were replaced by LiHAl(PO 4 )O 0.96 f 0.08 , the battery structure is LCO||graphite, and other parameters are the same as in Example 1; the specific electrochemical performance test results of the prepared lithium battery are shown in Table 1, and the safety performance test results are shown in Table 2.

[0136] Lithium-containing material LiHAl(PO 4 )O 0.96 f 0.08 The preparation method is as follows:

[0137] Step (1) Stir and mix evenly according to lithium salt lithium carbonate, aluminum-containing material alumina, phosphorus-containing material phosphorus pentoxide and halogen-containing material hydrogen fluoride, wherein the molar ratio of Li, Al, P, and halogen is 12.5:12.5:12.5: 1. The mixing time is 30min, and the stirring rate is 200rpm; the mixture is obtained;

[0138] Step (2) sintering the mixture, the temperature of the sintering treatment is 300°C, and the sintering time is 200h; the sintering atmosphere is a nit...

Embodiment 3

[0141] The solid electrolyte particles were replaced by LiHAl(PO 4 )O 0.94 Cl 0.12 , the battery structure is NCM||graphite, and other parameters are the same as in Example 1; the specific electrochemical performance test results of the prepared lithium battery are shown in Table 1, and the safety performance test results are shown in Table 2.

[0142] Lithium-containing material LiHAl(PO 4 )O 0.94 Cl 0.12 The preparation comprises the following steps:

[0143] Step (1) Stir and mix evenly according to the lithium salt lithium acetate, the aluminum-containing material aluminum hydroxide, the phosphorus-containing material phosphine, and the halogen-containing material phosphorus chloride, wherein the molar ratio of Li, Al, P, and halogen is 16.6:16.6: 16.6:1, the mixing time is 1min, and the stirring rate is 1800rpm; the mixture is obtained;

[0144] Step (2) Sintering the mixture, the temperature of the sintering treatment is 500°C, and the sintering time is 100h; the s...

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Abstract

The invention discloses a lithium battery composite diaphragm as well as a preparation method and application thereof. The lithium battery composite diaphragm comprises a base membrane and an oxide solid electrolyte coating layer, the oxide solid electrolyte coating layer comprises oxide solid electrolyte particles. The preparation method comprises the following steps: adding a dispersing agent into a solvent, fully stirring, adding oxide solid electrolyte particles, uniformly grinding to prepare slurry A, continuously adding a thickening agent, a binder and a wetting agent, and fully stirring to prepare slurry B; and coating a base membrane with the slurry B, baking to form an oxide solid electrolyte coating, and rolling to obtain the composite diaphragm. The surface of the base membrane is coated with the oxide solid electrolyte layer to form the composite diaphragm, and the composite diaphragm is adopted during battery assembly, so that the safety performance and the electrochemical performance of the battery can be improved at the same time.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery composite separator, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, good cycle performance, long service life, low self-discharge, and no memory effect. They gradually occupy a larger application market in energy storage, power batteries, and 3C electronics, and have broad application prospects. . [0003] However, with the large-scale popularization and application of electric vehicles, their safety accidents occur from time to time, causing harm to the life and property safety of drivers and passengers. Safety accidents have become a fatal hidden danger to the development of electric vehicles. The essence of electric vehicle safety accidents is the thermal runaway of power batteries. Power battery thermal runaway refers to the phenomenon that the battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/457H01M50/403H01M50/451H01M50/489H01M50/491H01M10/052H01M10/0525
CPCH01M50/457H01M50/451H01M50/403H01M50/491H01M50/489H01M10/052H01M10/0525
Inventor 杨琪祖晨曦邱纪亮闫昭张新华翁启东俞会根
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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