Low-temperature lithium iron phosphate lithium-ion power battery

A lithium iron phosphate, power battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor low temperature performance, and achieve the effect of improving low temperature performance, stable structure, and expanding use

Inactive Publication Date: 2014-04-09
SHANDONG WINA GREEN POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the current situation of poor low-temperature performance of lithium iron phosphate lithium-ion power batteries, to have more excellent low-temperature performance without reducing other performance indic...

Method used

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  • Low-temperature lithium iron phosphate lithium-ion power battery
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  • Low-temperature lithium iron phosphate lithium-ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: 36Ah lithium iron phosphate lithium ion power battery

[0053] like figure 1 , 2 , 3, the lithium iron phosphate lithium ion power battery of the present invention includes a positive electrode sheet 2, a negative electrode sheet 3, a diaphragm 5, an electrolyte (not marked), a casing 1, a cover plate (not marked) and a pole 4, and the battery size It is 36mm×130mm×155mm.

[0054] Positive electrode sheet: The thickness of the positive electrode sheet is 145±2μm; the positive electrode active material is nano-sized lithium iron phosphate coated with a discontinuous graphene structure; the median particle size of the nano-sized lithium iron phosphate is 5-10nm, and the graphene is 3-8 layers of multilayer graphene, the coating area accounts for 40%-70% of the total surface area of ​​the lithium iron phosphate material; the binder is polyvinylidene fluoride; the conductive agent is a mixture of acetylene black and carbon nanotubes (CNT) , The weight percentage...

Embodiment 2

[0060] Example 2: 50Ah lithium iron phosphate lithium ion power battery

[0061] The battery is the same as in Embodiment 1, including a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, a casing, a cover plate, and a pole. The size of the battery in this embodiment is 45mm×120mm×187mm.

[0062] Positive electrode sheet: the thickness of the positive electrode sheet is 144±2μm; the positive electrode active material is nano-sized lithium iron phosphate coated with a discontinuous graphene structure; the median particle size of the nano-sized lithium iron phosphate is 5-10nm, and the graphene is 3-8 layers of multi-layer graphene, the coating area accounts for 40%-70% of the total surface area of ​​the lithium iron phosphate material. The binder is polyvinylidene fluoride; the conductive agent is a mixture of acetylene black and carbon nanotubes (CNT), and the weight percentage of acetylene black and CNT is 50%: 50%; the weight percentage of po...

example 2

[0067] The battery of Example 2 was tested: after the battery was fully charged at room temperature, it was stored at -40°C±2°C for 20 hours, and then at the same temperature, it was charged with 3I 3 (A) Current discharge until the end-of-discharge voltage is 2.0V, and the discharge capacity is 93.2% of the rated capacity.

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Abstract

The invention provides a low-temperature lithium iron phosphate lithium-ion power battery. The low-temperature lithium iron phosphate lithium-ion power battery comprises a positive plate, a negative plate, a membrane, electrolyte, a shell, a cover plate and a post terminal, wherein positive materials in the positive plate comprise a positive active material, a binding agent and a conductive agent, the positive active material is lithium iron phosphate which is subjected to nanocrystallization and is coated with a discontinuous graphene structure, the median diameter of the nanocrystallization lithium iron phosphate is 5-10nm, the graphene is 3-8 layers of multilayer graphene, and the coating area accounts for 40%-70% of the total surface area of the lithium iron phosphate material. The low-temperature lithium iron phosphate lithium-ion power battery has the advantages that the problem that the lithium iron phosphate lithium-ion power battery has poor low-temperature property is solved, the low-temperature lithium iron phosphate lithium-ion power battery has relatively excellent low-temperature property under the condition that other performance indexes are not lowered, the application range of the lithium iron phosphate lithium-ion power battery is greatly expanded, and the lithium iron phosphate lithium-ion power battery facilitates the popularization of electric cars in low-temperature areas and the normal use of the electric cars in cold winter.

Description

technical field [0001] The invention relates to a lithium ion storage battery, in particular to a low-temperature lithium iron phosphate lithium ion power battery. Background technique [0002] The shortage of petroleum resources and serious environmental pollution are two hot spots that are of great concern to the whole world. Among them, fuel vehicles are the focus of fuel consumption and the main source of air pollution, while electric vehicles are an effective means to alleviate energy and environmental protection problems. All countries are vigorously researching, Develop and industrialize products ranging from basic spare parts to complete vehicles. As a power battery for key components, lithium iron phosphate battery is recognized as one of the best batteries. It has the advantages of high safety performance, long cycle life, high storage capacity, and high temperature resistance. It can be widely used in miner's lamps, electric vehicles, electric tools, military com...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/36H01M4/62
CPCY02E60/122H01M4/364H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 熊俊威张亚利马春响别永合葛成凤王瑗忠张风太
Owner SHANDONG WINA GREEN POWER TECH
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