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Lithium ion battery based on NCM ternary composite material and preparation method thereof

A technology of lithium-ion batteries and composite materials, applied in the field of lithium-ion batteries based on NCM ternary composite materials, can solve the problems of insufficient battery cycle life, low safety of ternary materials, and uneven distribution of battery current to achieve enhanced safety , Excellent embedding and extraction performance, ensuring the effect of large current discharge and heat conduction and diffusion capabilities

Inactive Publication Date: 2016-11-09
SHANDONG WINA GREEN POWER TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, ternary materials have the characteristics of high discharge voltage platform and large gram capacity, and are the first choice for the development of high specific energy batteries. However, compared with materials with lithium iron phosphate olivine structure, the safety of ternary materials is obviously lower; at the same time , the cycle life of ternary material batteries is far less than that of iron-lithium battery materials
[0004] In addition, the cover plate structure used by most batteries at present, the positive and negative tab welding pins are located on one side, the overcurrent capacity is limited, and it is easy to cause uneven current distribution inside the battery when discharging at a high rate, resulting in long charging time and prone to localized damage. Overheating poses a safety hazard

Method used

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  • Lithium ion battery based on NCM ternary composite material and preparation method thereof
  • Lithium ion battery based on NCM ternary composite material and preparation method thereof
  • Lithium ion battery based on NCM ternary composite material and preparation method thereof

Examples

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Embodiment 1

[0041]A lithium-ion battery based on NCM ternary composite material, including positive pole, negative pole, diaphragm and electrolyte, between the positive pole and the negative pole, there is a high-strength diaphragm coated with silicon dioxide on one side with a thickness of 20 μm, and the positive pole includes aluminum foil And the positive electrode slurry coated on the aluminum foil, the positive electrode slurry is to dissolve the NCM ternary material and lithium iron manganese phosphate with a mass ratio of 85:15 in the solvent NMP; the particle size of the lithium iron manganese phosphate D50=6.0 μm, D90=11.0μm; the particle size of the ternary material D50=9.5μm, D90=8.0μm; the positive electrode slurry also contains 2wt% Super-p and 1wt% graphene; the positive electrode slurry The solid-to-liquid ratio in the material is 1:1; the double-sided coating density of the positive electrode slurry is 30mg / cm 2 ;The compacted density is 2.5g / cm 3 . The solid-to-liquid r...

Embodiment 2

[0043] A lithium-ion battery based on NCM ternary composite material, including positive pole, negative pole, diaphragm and electrolyte, between the positive pole and the negative pole, there is a high-strength diaphragm with a thickness of 20 μm coated with silicon dioxide on both sides, and the positive pole includes aluminum foil And the positive electrode slurry coated on the aluminum foil, the positive electrode slurry is the NCM ternary material and lithium iron manganese phosphate dissolved in the solvent NMP with a mass ratio of 80:20; the particle size of the lithium iron manganese phosphate D50=6.5 μm, D90=13.0μm; the particle size of the ternary material D50=6.0μm, D90=9.0μm; the positive electrode slurry also contains 1wt% Super-p and 1wt% graphene; the positive electrode slurry The solid-to-liquid ratio in the material is 1:1; the double-sided coating density of the positive electrode slurry is 36mg / cm 2 ;The compacted density is 3.0g / cm 3 . The negative electro...

Embodiment 3

[0045] A lithium-ion battery based on NCM ternary composite materials, including a positive electrode, a negative electrode and an electrolyte, a high-strength separator with a thickness of 15 μm double-sided coated alumina is provided between the positive electrode and the negative electrode, and the positive electrode includes aluminum foil and coated on The positive electrode slurry on the aluminum foil, the positive electrode slurry is to dissolve the NCM ternary material and lithium iron manganese phosphate with a mass ratio of 75:25 in the solvent NMP; the particle size of the lithium iron manganese phosphate is D50=8.0 μm, D90= 15.0 μm; the particle size of the ternary material D50=7.5 μm, D90=12.5 μm; the positive electrode slurry also contains 1wt% Super-p and 1.5wt% carbon nanotubes; the positive electrode slurry The solid-to-liquid ratio is 2:3; the double-sided coating density of the positive electrode slurry is 35mg / cm 2 ;The compacted density is 2.6g / cm 3 . The...

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Abstract

The invention discloses a lithium ion battery based on NCM ternary composite material and a preparation method thereof. The lithium ion battery includes a positive pole, a negative pole, a diaphragm and electrolyte, wherein positive pole slurry contains a NCM ternary material and lithium ferric manganese phosphate; for the particle size of the lithium ferric manganese phosphate, D50 is 4.5-10.0 microns, and D90 is 10.0-19.0 microns; for the particle size of the ternary material, D50 is 5.0-10.0 microns, and D90 is 1.0-18.0 microns; the positive pole slurry further contains a conductive agent greater than or equal to 1% by weight. An anode material is a carbon material, D50 is smaller than or equal to 10 microns, D90 is smaller than or equal to 160 microns, and the conductive agent is greater than or equal to 1.5%. After a positive pole piece and a negative pole piece are respectively rolled, the ceramic diaphragm is introduced to prepare a battery core, the battery core is put into a battery shell, and the electrolyte is filled to obtain the lithium ion battery after drying. The lithium ion battery prepared by adopting the preparation method is good in safety, long in cycle life, high in energy density, strong in high and low temperature, adaptability and excellent in rate performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery technology based on NCM ternary composite materials. Background technique [0002] Due to its high energy density, relatively stable discharge voltage, no memory effect, wide operating temperature range, no pollution, long cycle life, and good safety performance, lithium-ion batteries have been widely used in mobile communication tools and cameras since their inception. , notebooks and other portable electronic devices. With the development of society and the enhancement of people's awareness of environmental protection, lithium-ion secondary batteries are used in more and more fields, such as new energy vehicles, energy storage equipment, smart equipment, etc.; however, in terms of current technology, lithium-ion batteries Common problems such as low capacity, short battery mileage, and long charging time make it difficult to meet consumers' ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525H01M10/058
CPCH01M4/364H01M4/505H01M4/525H01M4/5825H01M10/0525H01M10/058H01M2004/021Y02E60/10Y02P70/50
Inventor 冯丽娟王瑗钟李成杰孙祥军张金煌王盈盈代汉博张超刘金鹏张君楠杜纪磊
Owner SHANDONG WINA GREEN POWER TECH