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Coating slurry with manganese ion adsorption capacity for lithium battery diaphragm

A lithium battery diaphragm and adsorption capacity technology, applied in the field of materials, can solve the problem of electrode reversible cycle capacity attenuation, and achieve the effect of manganese ion adsorption capacity

Inactive Publication Date: 2019-10-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Deposited manganese ions hinder the flow of lithium ions, thereby attenuating the reversible cycle capacity of the electrode

Method used

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  • Coating slurry with manganese ion adsorption capacity for lithium battery diaphragm
  • Coating slurry with manganese ion adsorption capacity for lithium battery diaphragm
  • Coating slurry with manganese ion adsorption capacity for lithium battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0027] A coating slurry for lithium battery diaphragm with manganese ion adsorption capacity, which contains manganese ion chelating agent, binder polymethyl methacrylate (PMMA), aluminum oxide and dispersant polyethylene glycol (PEG ). The mass ratio of binder, inorganic oxide, dispersant and manganese ion chelating agent is 100:7:4:6. Put the coated diaphragm and normal PP film in a certain concentration of manganese ion solution, after a period of time, compare the manganese ion concentration in the two cups of solution.

[0028] The manganese ion adsorption capacity of the above-mentioned coated diaphragm and normal PP film is compared, and the specific operation steps are as follows:

[0029] 1) Dissolve trisodium nitrilotriacetate (NTA) in water first, add binder, alumina particles and dispersant to make a slurry, and use a manual scraper coater to hang coat on PP diaphragm (20um) on one side, 70 Dry at ℃ for 10 minutes to obtain a coating film with a coating thickness...

Embodiment 3

[0034]A coating slurry for lithium battery diaphragm with manganese ion adsorption capacity, which contains manganese ion chelating agent trisodium nitrilotriacetate (NTA), binder polymethyl methacrylate (PMMA), aluminum oxide and Dispersant polyethylene glycol (PEG). The mass ratio of binder, inorganic oxide, dispersant and manganese ion chelating agent is 100:7:4:6.

[0035] The preparation steps of the above-mentioned lithium battery diaphragm coating slurry with manganese ion adsorption capacity are as follows:

[0036] 1) First, trisodium trisodium triacetate (NTA) is dissolved in water, and mixed with binder, alumina particles and dispersant to form a slurry.

[0037] 2) Use a manual scraper coater to coat on one side of the PP diaphragm (20um).

[0038] 3) Dry at 70°C for 10 minutes to obtain a coating film with a coating thickness of 2-4um.

[0039] The film obtained in this embodiment is fully soaked in the electrolyte and assembled into a ternary battery (LiNi 1 / ...

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Abstract

The invention discloses coating slurry with the manganese ion adsorption capacity for a lithium battery diaphragm, and the coating slurry is prepared by mixing a manganese ion chelating agent with water and then adding an inorganic oxide, a binder and a dispersing agent, wherein the mass ratio of the binder to the inorganic oxide to the dispersing agent to the chelating agent is 100: (5-20): (1-10): (4-8); the manganese ion chelating agent is one of sodium citrate, ethylene diamine tetraacetic acid (ETDA), nitrilotriacetic acid trisodium salt (NTA) and dicarboxylic acid. The manganese ion chelating agent is dissolved in water, and the coating slurry is prepared from the manganese ion chelating agent, the binding agent, the dispersing agent and the inorganic oxide; the coating formed by coating the surface of the lithium ion battery diaphragm with the coating slurry can effectively absorb manganese ions dissolved in an electrolyte, and therefore, the manganese ion adsorption capacity ofthe lithium ion battery diaphragm is achieved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a coating slurry for lithium battery diaphragms. Background technique [0002] Ternary battery (LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 )) With high energy density and cycle life, it is one of the preferred batteries for contemporary new energy vehicles and high-energy electronic products. It is suitable for high temperature and normal temperature, but in the process of cycling at high temperature and normal temperature, the ternary battery (LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 )) The manganese ions dissolved from the positive electrode will enter the electrolyte and then diffuse through the battery separator to the negative electrode and deposit on the surface of the negative electrode. The deposited manganese ions hinder the flow of lithium ions, thereby attenuating the reversible cycle capacity of the electrode. Manganese ions can effectively improve the safety performance of ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525
CPCH01M10/0525H01M50/446Y02E60/10
Inventor 唐浩林汪鑫郭伟斌
Owner WUHAN UNIV OF TECH
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