Preparation method of positive pole piece containing positive electrode material coated by electricity and lithium conducting composite material and lithium-ion battery

A technology of positive electrode materials and positive electrode sheets, which is applied in the field of preparation of positive electrode sheets, can solve the problems of high lithium ion transfer barrier in the coating layer, affecting the performance of lithium ion batteries, and poor lithium ion conductivity, so as to improve electrochemical performance. performance, reduce surface side reactions, and stabilize performance

Active Publication Date: 2019-08-20
ZHUHAI COSMX BATTERY CO LTD
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Problems solved by technology

The Chinese invention patent application with the application number CN201811110006.9 discloses a nickel-cobalt lithium manganese oxide cathode material coated with nano-carbon composite conductive polymer and its preparation method, forming a layer of polymer on the surface of nickel-cobalt lithium manganese oxide The conductive polymer coating can improve the conductivity of the electrode material, but the coating layer has poor lithium ion conductivity, which affects the deintercalation of lithium ions and reduces battery performance
The Chinese inventi

Method used

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specific Embodiment approach 1

[0027] A method for preparing a positive electrode sheet comprising a conductive lithium-conducting composite material coated positive electrode material, comprising the following steps:

[0028] Step 1: In an inert gas atmosphere, by weight, 2.5 to 25 parts of vinyl sulfonic acid monomer, 0.01 to 2.0 parts of crosslinking agent, 0.01 to 0.5 parts of initiator, 0 to 5 parts of conductive material, 25 Mix ~100 parts of solvent, stir at room temperature at a speed of 100~400r / min, then add 2~150 parts of positive electrode material, vacuum impregnate at room temperature for 8~24h, then remove the solvent at room temperature, and place in an inert gas atmosphere at 50~90°C React for 2-10 hours to obtain a positive electrode material coated with a cross-linked polymer;

[0029] Step 2: In parts by weight, the lithium salt and the low boiling point solvent are configured into a mixed solution A system, the molar concentration of lithium ions in the A system is 0.2-4mol / L, and the p...

Embodiment 1

[0049] A method for preparing a positive electrode sheet comprising a conductive lithium-conducting composite material coated positive electrode material, comprising the following steps:

[0050] Step 1: In an inert gas atmosphere, 2.5 parts of 2-methyl-2-acrylic acid-2-sulfoethyl ester, 0.01 part of divinylbenzene, 0.01 part of azobisisobutyronitrile, 25 Mix a few parts of toluene, stir at a speed of 100r / min at room temperature, then add 2 parts of lithium iron phosphate, vacuum impregnate at room temperature for 8 hours, remove toluene at room temperature, and react at 50°C for 2 hours under an inert gas atmosphere to obtain a cross-linked polymer Coated lithium iron phosphate;

[0051] Step 2: In parts by weight, lithium perchlorate and dimethyl carbonate are configured into a mixed solution A system, the molar concentration of lithium ions in the A system is 0.2mol / L, and the phosphoric acid coated with the cross-linked structure polymer Add iron lithium to the excess A ...

Embodiment 2

[0055] A method for preparing a positive electrode sheet comprising a conductive lithium-conducting composite material coated positive electrode material, comprising the following steps:

[0056] Step 1: In an inert gas atmosphere, by parts by weight, 5 parts of vinylbenzenesulfonic acid, 0.5 part of divinyltetramethyldisilane, 0.3 part of benzoyl peroxide, 1 part of conductive carbon black, 50 Mix acetonitrile with 200r / min at room temperature, then add 100 parts of lithium cobaltate, vacuum impregnate at room temperature for 10 hours, remove acetonitrile at room temperature, and react at 70°C for 4 hours in an inert gas atmosphere to obtain a cross-linked polymer Coated lithium cobalt oxide;

[0057] Step 2: In parts by weight, lithium hexafluorophosphate (LiPF 6 ) and diethyl carbonate are configured into a mixed solution A system, and the molar concentration of lithium ions in the A system is 0.5mol / L, and the lithium cobaltate covered by the cross-linked structure polyme...

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Abstract

The invention provides a preparation method of a positive pole piece containing a positive electrode material coated by an electricity and lithium conducting composite material, and belongs to the technical field of lithium-ion batteries. The preparation method comprises the steps of uniformly stirring a vinyl sulfonic acid monomer, a cross-linking agent, an initiator and a solvent, then adding apositive electrode material, removing the solvent after impregnation, reacting for 10h at a temperature of 90 DEG C to obtain a positive electrode material coated by a cross-linked polymer; preparinga mixed solution by lithium salt and a low-boiling-point solvent, adding the positive electrode material coated by the cross-linked polymer, removing the low-boiling-point solvent until sulfonate or sulfonic acid cations in a coating layer of the positive electrode material is/are converted into lithium sulfonate structure to obtain a positive electrode material coated by a lithium sulfonate cross-linked polymer electrolyte; and uniformly mixing the positive electrode material coated by the lithium sulfonate cross-linked polymer electrolyte, a binder, a lithium conducting material and a conductive agent, and then forming a positive pole piece after coating and drying. The positive electrode material has lithium ion and electricity conducting properties, and improves the performances of thelithium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of a positive electrode sheet comprising a conductive lithium-conducting composite material coated with a positive electrode material and a lithium-ion battery. Background technique [0002] Due to the characteristics of no memory effect, no pollution, and long life, lithium-ion batteries have great application potential in power vehicles, digital and other fields. A lithium-ion battery is mainly composed of a positive electrode, a negative electrode, a separator, and an electrolyte. As one of the core materials of lithium-ion batteries, the cathode materials currently mainly include lithium cobaltate, lithium manganate, lithium iron phosphate, nickel-cobalt lithium manganate, nickel-cobalt lithium aluminate, etc. When the positive electrode material is in direct contact with the electrolyte during charging and discharging, there wi...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/36H01M4/62H01M10/0525H01M4/13
CPCH01M4/13H01M4/139H01M4/366H01M4/624H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 唐伟超李素丽赵伟袁号李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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