Lithium ion positive electrode coating and lithium ion battery

A lithium-ion battery and lithium-ion technology, applied in the coating of electrode collectors, secondary batteries, battery electrodes, etc., can solve the problem of reduced battery discharge capacity, achieve reduced resistance, high lithium salt concentration, and high conductivity Effect

Inactive Publication Date: 2020-03-24
SHENZHEN ZHUONENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, because lithium-ion batteries are extremely sensitive to operating temperature, the battery discharge capacity of lithium-ion batteries is greatly reduced in an environment below 0°C, which limits its application in northern regions.

Method used

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  • Lithium ion positive electrode coating and lithium ion battery
  • Lithium ion positive electrode coating and lithium ion battery
  • Lithium ion positive electrode coating and lithium ion battery

Examples

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preparation example Construction

[0041] The preparation method of lithium ion cathode coating 12, comprises the following steps:

[0042] 1) Mix and stir the conductive binder and deionized water, and add the conductive agent;

[0043] 2) adding the positive electrode active material for mixing and stirring, adding deionized water to make a lithium ion positive electrode slurry with a solid content of 48-72%;

[0044] 3) Coating the lithium ion positive electrode slurry obtained in step 2) on the positive electrode current collector 14, and drying in a manner of gradient temperature rise at 50-110° C., to obtain the lithium ion positive electrode coating 12 . In order to improve the processing performance of the positive electrode slurry, a mixture of deionized water and NMP can be selected as the pulping solvent, and the amount of NMP added is 0-5% of the dry powder weight of the positive electrode slurry.

[0045] A lithium-ion battery, such as figure 1 As shown, the above-mentioned lithium-ion battery po...

Embodiment 1

[0053] The ratio of the lithium ion positive electrode coating 12 is: positive electrode active material: conductive binder: conductive agent = 95.0:4.0:1.0. The electrolyte ratio is: EC:EMC:DMC=20:10:65, the concentration of LiPF6 is 1.4mol / L, 0.1%FEC, 0.2%FPS, 1%ES, 1%LiFSI and 0.2%DTD.

[0054] Preparation method of conductive adhesive:

[0055] 1) Acrylic acid monomers are polymerized to generate propylene-based multi-polymers, and 0.2mol / L lithium hydroxide is added, wherein the molar ratio of propylene-based multi-polymers to lithium hydroxide is 1:0.02 to generate carboxylithium and hydroxylithium functional groups ;

[0056] 2) Add carbon nanotubes to the acrylic multi-polymer polymer obtained in step 1), the weight ratio of the acrylic multi-polymer and carbon nanotubes is 99.5:0.5, and after the two are ultrasonically mixed at 40°C, the acrylic multi-polymer The molecular chains of the carbon nanotubes and the molecular chains of the carbon nanotubes are fully open...

Embodiment 2

[0066] The ratio of the lithium ion positive electrode coating 12 is: positive electrode active material: conductive binder: conductive agent = 95.0:4.0:1.0. The electrolyte ratio is: EC:EMC:DMC=25:10:65, LiPF 6 The concentration is 1.4mol / L, 1.2% FEC, 0.8% FPS, 1% ES, 1% LiFSI, 0.7% DTD.

[0067] Preparation method of conductive adhesive:

[0068] 1) Acrylic acid monomers are polymerized to generate propylene-based multi-polymers, and 0.3mol / L lithium hydroxide is added. The molar ratio of propylene-based multi-polymers to lithium hydroxide is 1:0.03 to generate carboxylithium and hydroxylithium functional groups ;

[0069] 2) Add carbon nanotubes to the acrylic multi-polymer polymer obtained in step 1), and the weight ratio of the acrylic multi-polymer to carbon nanotubes is 99.5:0.5. After the two are ultrasonically mixed at 40-60 DEG C, the molecular chains of the acrylic polypolymer and the carbon nanotube molecular chains are fully opened, and the two are fully mixed ...

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Abstract

The invention discloses a lithium ion positive electrode coating and a lithium ion battery. A modified lithium iron phosphate material is selected as a positive electrode active material of the lithium ion positive electrode coating, and manganese, cobalt, nickel and other elements are doped, so that the impedance of lithium iron phosphate is reduced, the electronic conductivity and lithium ion conductivity of lithium iron phosphate are improved, and free and rapid migration of lithium ions is realized under a low-temperature condition; the conductive adhesive is uniformly dispersed among thepositive active substances and between the positive active substances and the current collector to play a role in adhesion; the conductive binder has lithium carboxylate and hydroxyl lithium functional groups, so that the conductive binder has conductivity; the conductive adhesive and the conductive material are fully and uniformly mixed by ultrasonic waves, so that the conductivity is improved; and a complete and dense three-dimensional conductive network is formed under the synergistic effect of a conductive agent added in the homogenizing process, so that the resistance of the lithium ion positive electrode coating is reduced, and the low-temperature discharge performance of the lithium ion battery taking the lithium ion battery positive plate coated with the lithium ion positive electrode coating as the positive electrode is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to a lithium-ion positive electrode coating and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have been widely used in consumer electronics and electric vehicles due to their advantages such as high energy density, small size and light weight, long cycle life, and no memory effect. [0003] However, since lithium-ion batteries are extremely sensitive to operating temperature, the battery discharge capacity of lithium-ion batteries is greatly reduced in an environment below 0°C, which limits its application in northern regions. Contents of the invention [0004] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a lithium-ion positive electrode coating and a lithium-ion battery, which can improve the discharge capacity of the lithium-ion battery in a low-temperature environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/58H01M4/62H01M4/1397H01M4/04H01M10/0525H01M10/0587
CPCH01M4/136H01M4/5825H01M4/622H01M4/624H01M4/625H01M4/1397H01M4/0404H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 欧瑞先朱燕飞黄国文黄延新韦丽娟
Owner SHENZHEN ZHUONENG NEW ENERGY TECH
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