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A high energy density lithium iron phosphate battery

A lithium iron phosphate battery, high energy density technology, applied in the field of electrochemistry, can solve the problems of low production quality, difficult infiltration under high pressure, large temperature rise of the battery, etc., to improve conductivity, improve battery rate performance, and improve long-term The effect of cycle life

Active Publication Date: 2022-03-15
江西安驰新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the existing technology, starting from the four dimensions of battery energy density improvement and cycle optimization, improvement of processing efficiency, and cost reduction, to solve the problem of high temperature rise and high-pressure infiltration of the existing iron-lithium battery. Difficulty and low production yield

Method used

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  • A high energy density lithium iron phosphate battery
  • A high energy density lithium iron phosphate battery
  • A high energy density lithium iron phosphate battery

Examples

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Embodiment 1

[0029] (1) Positive plate

[0030] Mix titanium-doped lithium iron phosphate and positive electrode conductive binder ZONE80M with NMP at a ratio of 98.5:1.5 to make a positive electrode slurry, and apply the positive electrode slurry evenly on the front and back sides of a 12.5 μm aluminum foil, and then roll , the compacted density is 2.65g / cc, and then die-cut to make the positive electrode sheet;

[0031] Among them, for the titanium-doped lithium iron phosphate, the particle size of the large single crystal particle is 600-800 nm, and the particle size of the small single crystal particle is 100-200 nm. Based on the weight of titanium-doped lithium iron phosphate, the weight content of titanium is 800 ppm, and the titanium comes from titanium dioxide or tetrabutyl titanate. Specifically, titanium dioxide is selected in this embodiment.

[0032] (2) Preparation of negative electrode

[0033] Negative electrode active material (carbon-coated single particle and secondary ...

Embodiment 2

[0041] The difference from Example 1 is that the addition amount of the positive electrode conductive binder ZONE80M is 1.0%.

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Abstract

The invention belongs to the technical field of electrochemistry, and in particular relates to a high-energy density lithium iron phosphate battery. The positive electrode active material is selected from titanium / or magnesium doped lithium iron phosphate, and the surface density of the positive electrode sheet is 190-210 g / m. 2 , compacted density ≥2.60g / cc, negative electrode active material is carbon-coated single particle and secondary particle needle coke blended artificial graphite, negative electrode compaction density ≥1.70g / cc, electrolyte density equal to 1.15 g / cc, the wall thickness of the aluminum shell is between 0.40 and 0.50 mm, the positive electrode current collector is 12-13 μm aluminum foil, the negative electrode current collector is 4.5 μm copper foil, the diaphragm is 7+2C+2P ceramic coated diaphragm, the positive electrode is Substitute the conductive binder, the addition amount is 1.0-2.0%, and the weight ratio of the positive electrode active material to the positive electrode dressing is ≥98%. The invention greatly improves the energy density of the battery, reaching 200Wh / kg.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a lithium iron phosphate battery with high energy density. Background technique [0002] With the gradual decline of state subsidies for new energy vehicles in recent years, the scarcity of cobalt resources and the increase in prices, and the spontaneous combustion of ternary batteries from time to time. Lithium iron phosphate batteries are gaining more and more attention in the market due to their low cost, long cycle and high safety attributes. BYD blade battery, Tesla MODEL3 iron-lithium version, Wuling Hongguang MINI EV, etc. are all major advancements in iron-lithium battery technology, and thus have gained increasing attention from the passenger car market. However, long battery life and high energy density have always been one of the key core technical indicators of power batteries as new energy vehicles. The low energy density of iron lithium has alw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M4/66H01M4/70H01M50/103H01M50/119H01M50/434H01M50/449H01M50/489H01M50/494H01M10/052H01M10/0568H01M10/0569H01M10/058B82Y30/00
CPCH01M4/5825H01M4/366H01M4/583H01M4/62H01M4/622H01M4/625H01M4/628H01M4/661H01M4/70H01M10/0568H01M10/0569H01M10/052H01M10/058B82Y30/00H01M2300/0025H01M2300/0042Y02P70/50Y02E60/10
Inventor 何涛斌林伸孙玉龙陈富源徐小明白科
Owner 江西安驰新能源科技有限公司
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