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Lithium ion secondary battery and electrolyte thereof

A secondary battery, lithium ion technology, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problem that the normal temperature cycle performance of lithium ion secondary batteries has not been effectively improved, and achieve good high temperature storage performance and high temperature. and normal temperature cycle performance, the effect of facilitating ion conduction

Active Publication Date: 2014-07-02
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The patent WO2013031712A1 published on March 17, 2013 improves the high-temperature storage performance and high-temperature cycle performance of lithium-ion secondary batteries by adding 1,3-dioxane (DOX) and hexamethylene diisocyanate to the electrolyte. However, the normal temperature cycle performance of lithium-ion secondary batteries has not been effectively improved.

Method used

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  • Lithium ion secondary battery and electrolyte thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Preparation of positive electrode sheets for lithium-ion secondary batteries

[0035] The positive electrode active material lithium cobalt oxide LiCoO 2 , the conductive agent Super-P, and the binder PVDF are added to the solvent N-methylpyrrolidone (NMP) at a mass ratio of 96:2:2 and mixed evenly to make a positive electrode slurry, and the positive electrode slurry is coated on the aluminum foil of the positive electrode current collector After drying at 85°C, cold pressing is carried out, then trimming, cutting, and slitting, and then drying at 85°C for 4 hours under vacuum conditions, and welding the positive electrode lugs to make the positive electrode of the lithium-ion secondary battery piece.

[0036] (2) Preparation of negative electrode sheet for lithium-ion secondary battery

[0037] Add the negative electrode active material graphite, the conductive agent Super-P, the thickener CMC, and the binder SBR into the solvent deionized water at a mass ratio ...

Embodiment 2

[0043] A lithium-ion secondary battery was prepared according to the method of Example 1, except that in the preparation of the electrolyte of the lithium-ion secondary battery (ie step (3)), the additive was 1 with a mass percentage of 0.2% of the total mass of the electrolyte. 3-dioxane (DOX) and tetramethylene diisocyanate with a mass percentage of 0.2% of the total mass of the electrolyte.

Embodiment 3

[0045] A lithium-ion secondary battery was prepared according to the method of Example 1, except that in the preparation of the electrolyte of the lithium-ion secondary battery (ie step (3)), the additive was 1 with a mass percentage of 0.2% of the total mass of the electrolyte. 3-dioxane (DOX) and tetramethylene diisocyanate with a mass percentage of 0.3% of the total mass of the electrolyte.

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Abstract

The invention provides a lithium ion secondary battery and electrolyte thereof. The electrolyte of the lithium ion secondary battery comprises lithium salt, an anhydrous organic solvent and an additive. The additive comprises a first additive and a second additive; the first additive is 1,3-dioxane (DOX); the second additive is a diisocyanate compound with a structure of formula I; in the formula I, R is selected from aliphatic alkyl groups of C2 to C4, aromatic alkyl groups containing a single benzene ring of C6 to C10 and aromatic alkyl groups containing two benzene rings of C12 to C15; the mass percent of the first additive in the electrolyte of the lithium ion secondary battery is 0.2 to 2.5 percent; the mass percent of the second additive in the electrolyte of the lithium ion secondary battery is 0.1 to 2.0 percent. The lithium ion secondary battery comprises the electrolyte. The lithium ion secondary battery is excellent in high-temperature and normal-temperature cycling performance and high-temperature storage performance under a high voltage condition. OCN-R-NCO formula 1.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium-ion secondary battery and its electrolyte. Background technique [0002] Lithium-ion secondary batteries have the advantages of high working voltage, long working life, and fast charging speed. However, with the continuous development of technology, people require lithium-ion secondary batteries to have higher energy density. [0003] At present, the method usually used to improve the energy density of lithium-ion secondary batteries is to increase the charging cut-off voltage of lithium-ion secondary batteries, so that lithium-ion secondary batteries have a higher operating voltage platform, and make the positive electrode extract a higher proportion of lithium ions. Therefore, the lithium-ion secondary battery can obtain a higher discharge capacity. However, when the positive electrode is charged to a higher cut-off voltage, the oxidation capacity of the positive electrode w...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122H01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 褚春波付成华朱立坤
Owner NINGDE AMPEREX TECH