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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 difficult infiltration of high pressure, low production quality, and large battery temperature rise.

Active Publication Date: 2021-07-06
江西安驰新能源科技有限公司
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  • Summary
  • 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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Examples

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Embodiment 1

[0029] (1) Positive electrode

[0030] The titanium-doped lithium iron phosphate and the positive conductive binder ZONE80M were mixed with NMP according to the ratio of 98.5:1.5 to make the positive electrode slurry. , the compaction density is 2.65g / cc, and then die-cut to obtain a positive electrode sheet;

[0031] Wherein, in the titanium-doped lithium iron phosphate, the particle size of the large single crystal particles is 600-800 nm, and the particle size of the small single crystal particles 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] The anode active material (carbon-coated single particle and secondary particle needle coke blend artificial graphite, particle D 50≤10μm), conductive carbon black, negative ...

Embodiment 2

[0041] Different from Example 1, the positive electrode conductive binder ZONE80M was added in an amount of 1.0%.

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Abstract

The invention belongs to the technical field of electrochemistry, and particularly relates to a high-energy-density lithium iron phosphate battery. A positive electrode active material is selected from titanium / magnesium-doped lithium iron phosphate, the surface density of a positive plate is 190-210 g / m<2>, the compaction density is greater than or equal to 2.60 g / cc, a negative electrode active material is carbon-coated single particle and secondary particle needle coke blend artificial graphite, and the compaction density of a negative plate is greater than or equal to 1.70 g / cc. The density of the electrolyte is equal to 1.15 g / cc, the wall thickness of the aluminum shell body is 0.40-0.50 mm, a positive electrode current collector is an aluminum foil with the diameter of 12-13 [mu]m, a negative electrode current collector is a copper foil with the diameter of 4.5 [mu]m, a diaphragm is a 7 + 2C + 2P ceramic gluing diaphragm, a conductive binder is used for replacing a positive electrode, the addition amount is 1.0-2.0%, and the weight ratio of a positive electrode active material to a positive electrode dressing is greater than or equal to 98%. According to the invention, the energy density of the battery is greatly improved and reaches 200Wh / kg.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a high energy density lithium iron phosphate battery. Background technique [0002] With the gradual decline of state subsidies for new energy vehicles in recent years, the scarcity of cobalt resources and price increases, and ternary battery installations, spontaneous combustion has occurred from time to time. LiFePO4 batteries are gaining more and more attention in the market due to their low cost, long cycle and high safety properties. 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 received 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 always re...

Claims

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Application Information

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Patent Type & Authority Applications(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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