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High-compaction lithium iron phosphate lithium-ion battery non-aqueous electrolyte and lithium-ion battery

A technology for solid lithium iron phosphate and lithium ion batteries, which is applied in the field of high-pressure compacted lithium iron phosphate lithium ion battery non-aqueous electrolyte and lithium ion batteries, and can solve the problems affecting the cycle performance, high temperature storage performance and low temperature discharge of lithium iron phosphate batteries Performance and production efficiency, long activation time, insufficient liquid absorption of pole pieces and diaphragms, etc., to improve room temperature cycle performance, reduce activation time, and reduce interface AC impedance

Inactive Publication Date: 2019-07-12
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is in order to overcome the deficiency of above-mentioned background technology, a kind of nonaqueous electrolytic solution of high compacted lithium iron phosphate lithium ion battery is provided, the additive in the nonaqueous electrolytic solution of this high compacted lithium iron phosphate lithium ion battery has good Excellent wetting performance and oxidation resistance, which can effectively solve the problem of high-pressure compacted lithium iron phosphate lithium-ion batteries due to excessive compaction density of positive and negative electrodes, resulting in insufficient liquid absorption and long activation time of the electrode and diaphragm, which affect the iron phosphate. The cycle performance, high temperature storage performance, low temperature discharge performance and production efficiency of lithium batteries

Method used

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  • High-compaction lithium iron phosphate lithium-ion battery non-aqueous electrolyte and lithium-ion battery
  • High-compaction lithium iron phosphate lithium-ion battery non-aqueous electrolyte and lithium-ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Electrolyte preparation: In a glove box filled with argon gas, ethylene carbonate, propylene carbonate, diethyl carbonate and ethyl methyl carbonate were mixed according to the mass ratio of EC:PC:DEC:EMC=25:10:20: 45 for mixing, then slowly add 12.5wt% lithium hexafluorophosphate to the mixed solution, and finally add 2.0wt% fluoroether additives (compound 1) accounting for the total mass of the electrolyte, and stir evenly to obtain the lithium ion battery electrolyte of Example 1 .

[0033] Preparation of lithium-ion batteries:

[0034] The positive electrode active material lithium iron phosphate, the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) are fully stirred and mixed in the N-methylpyrrolidone solvent system at a mass ratio of 96:2:2, and then coated on drying on aluminum foil and cold pressing to obtain the positive electrode sheet.

[0035] Negative electrode active material artificial graphite, conductive agent acetylene...

Embodiment 2-19

[0038] Embodiment 2-19 and comparative example 1-4

[0039] Examples 2-19 and Comparative Examples 1-4 are the same as Example 1, except that the proportions of the components of the electrolyte are added as shown in Table 1.

[0040] Table 1 embodiment 1-19 and the composition ratio of each component of the electrolyte of comparative example 1-4

[0041]

[0042]

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and discloses a high-compaction lithium iron phosphate lithium-ion battery non-aqueous electrolyte and a lithium-ion battery. Thehigh-compaction lithium iron phosphate lithium-ion battery non-aqueous electrolyte comprises a non-aqueous organic solvent, an electrolyte lithium salt and additives, wherein the additives include conventional additives and a fluoro-ether additive with a structure shown in formula (I). The additives in the high-compaction lithium iron phosphate lithium-ion battery non-aqueous electrolyte have good infiltration performance and oxidation resistance, can effectively solve a problem that the cycle performance, high temperature storage performance, low temperature discharge performance and the production efficiency of the lithium iron phosphate lithium-ion battery are affected by insufficient liquid absorption and long activation time of a pole plate and a diaphragm due to overhigh compactiondensity of positive and negative pole plates of the high-compaction lithium iron phosphate lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-pressure compacted lithium iron phosphate lithium ion battery non-aqueous electrolyte and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products, power tools, electric vehicles, aerospace and other fields due to their high operating voltage, high energy density, long life, wide operating temperature range, and environmental friendliness. At present, the power battery materials of domestic passenger cars, electric buses and special vehicles mainly include lithium iron phosphate and ternary materials. [0003] In terms of energy density, lithium iron phosphate is far from ternary materials. The theoretical gram capacity of lithium iron phosphate is 170mAh / g, and the actual gram capacity is 150mAh / g (the theoretical gram capacity of ternary materials is 275mAh / g, and the actual gram capacity 160-220mAh / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 潘立宁杜建委郭力杨冰
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD