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High-safety long-service-life lithium ion storage battery positive plate and preparation method and application thereof

A high-safety, long-life technology, used in non-aqueous electrolyte battery electrodes, battery electrodes, secondary batteries, etc., can solve the problems of poor cycle life and safety, low specific capacity of lithium iron phosphate batteries, etc., and achieve good charge and discharge. performance, the effect of improving the rate of delithiation and intercalation, good liquid absorption and liquid retention

Inactive Publication Date: 2018-01-30
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a high-safety and long-life lithium-ion battery positive electrode sheet and its preparation method and application. The positive electrode sheet solves the problem of poor cycle life and safety of NCA lithium-ion batteries and low specific capacity of lithium iron phosphate batteries problems, can improve the specific energy, cycle performance and safety of the battery

Method used

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  • High-safety long-service-life lithium ion storage battery positive plate and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0060] A method for preparing a high-safety and long-life lithium-ion battery positive plate, the method comprising:

[0061] Step 1: Add NMP (the amount of NMP added to completely dissolve PVDF) into the mixing tank, add PVDF, stir until PVDF is completely dissolved, add conductive carbon black in different weight ratios, and obtain conductive colloid and nickel iron phosphate respectively The conductive colloid of lithium cobalt aluminate, wherein the weight of conductive carbon black added to the conductive colloid of lithium iron phosphate is 0.5 times of the weight of PVDF, and the weight of conductive carbon black added to the conductive colloid of nickel cobalt aluminate lithium is 0.5 times of the weight of PVDF. 2 / 3 times;

[0062] Step 2: Add lithium iron phosphate and lithium nickel cobalt aluminate respectively to the conductive colloid in step 1, mix evenly, and obtain lithium iron phosphate positive electrode slurry and lithium nickel cobalt aluminate positive el...

Embodiment 2

[0065] A high-safety and long-life lithium-ion battery positive electrode sheet prepared in Example 1, the positive electrode sheet includes: an aluminum foil current collector and a double-layer active material coating coated on its surface. The double-layer active material coating is: a lithium iron phosphate coating, and a nickel cobalt lithium aluminate coating coated on the lithium iron phosphate coating. The coating surface density of lithium iron phosphate coating is 50g / m 2 , the coating surface density of nickel cobalt lithium aluminate coating is 300g / m 2 .

[0066] The lithium iron phosphate coating contains the following components in weight percentage: 94% lithium iron phosphate, 4% PVDF and 2% conductive carbon black.

[0067] The nickel-cobalt-lithium-aluminate coating contains the following components by weight percentage: 95% nickel-cobalt-lithium aluminate, 4% PVDF and 3% conductive carbon black.

Embodiment 3

[0069] A high-safety and long-life lithium-ion storage battery comprises: a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte and a casing. The positive electrode sheet is the high-safety and long-life lithium-ion battery positive electrode sheet of Example 2, and the preparation process of the negative electrode sheet, diaphragm, electrolyte, and the battery is the same as that of Example 3.

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Abstract

The invention discloses a preparation method of a high-safety long-service-life lithium ion storage battery positive plate. The method includes: step 1, adding an adhesive into solvent to dissolve, and adding a conductive agent to obtain conductive adhesive; step 2, adding lithium iron phosphate and lithium nickel cobalt aluminate into the conductive adhesive obtained in the step 1, and well mixing to obtain lithium iron phosphate positive pole paste and lithium nickel cobalt aluminate positive pole paste; step 3, coating upper and lower surfaces of a metal foil current collector with the lithium iron phosphate positive pole paste and lithium nickel cobalt aluminate positive pole paste sequentially, drying, rolling, and slicing to obtain the high-safety long-service-life lithium ion storage battery positive plate. By adoption of the method for preparing the positive plate, an active substance coating with lithium nickel cobalt aluminate is applied to lithium iron phosphate, and accordingly the cycle life of a battery is prolonged, safety of the battery is improved, and specific capacity of the battery is increased.

Description

technical field [0001] The invention belongs to the field of lithium-ion storage batteries, and relates to a high-safety and long-life lithium-ion storage battery positive electrode sheet, in particular to a high-safety and long-life lithium-ion storage battery positive electrode sheet and its preparation method and application. Background technique [0002] Lithium-ion batteries have become a new type of energy storage power source after nickel-cadmium batteries and nickel-hydrogen batteries due to their high operating voltage, high energy density, low self-discharge, long cycle life, no memory effect, clean, environmentally friendly and pollution-free. And it is widely used in various fields such as electric vehicles, satellites, spacecraft, submarines, torpedoes, missiles, etc., and has gradually become the focus of research in the field of new energy. [0003] In recent years, the lightweight requirements of power supply systems such as aerospace and electric vehicles ha...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M4/13H01M4/139H01M4/36H01M4/525H01M4/58H01M10/0525H01M50/411H01M50/431H01M50/449
CPCY02E60/10
Inventor 田娟邹连荣李琳琳徐冬梅杨晨
Owner SHANGHAI INST OF SPACE POWER SOURCES
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