Lithium ion secondary battery and electrolyte thereof

A secondary battery, lithium ion technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor cycle performance of lithium ion secondary batteries, easy to be oxidized by the positive electrode, etc., to improve the normal temperature cycle performance and high temperature. Effect of cycle performance, improved interface performance, and improved high temperature storage performance

Active Publication Date: 2016-01-13
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In lithium-ion secondary batteries, cyclic carbonates and chain carbonates are generally used as non-aqueous organic solvents, but under high-voltage and high-temperature storage, non-aqueous organic solvents in lithium-ion secondary batteries are easily oxidized by the positive electrode to produce gas
The Chinese patent application publication number CN103380530A published on October 30, 2013 discloses a method of adding hexamethylene diisocyanate (HDI) as an additive to the electrolyte to improve the high-temperature storage performance of lithium-ion secondary batteries , but hexamethylene diisocyanate (HDI) will lead to poor cycle performance of lithium-ion secondary batteries

Method used

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  • Lithium ion secondary battery and electrolyte thereof
  • Lithium ion secondary battery and electrolyte thereof
  • Lithium ion secondary battery and electrolyte thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Preparation of the positive electrode sheet of the lithium-ion secondary battery

[0040] 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 current collector , and then through cold pressing, drying (to form a positive electrode diaphragm), and welding tabs, the positive electrode sheet of the lithium-ion secondary battery is made.

[0041] (2) Preparation of the negative electrode sheet of the lithium-ion secondary battery

[0042] 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 of 96.5:1.0:1.0:1.5 and mix evenly to make a negative electrode slurry, and coat the negative elect...

Embodiment 2

[0048] Lithium-ion secondary battery is prepared according to the method of Example 1, but in the preparation of the electrolyte of lithium-ion secondary battery (i.e. step (3)), the additive is the mass percentage in the electrolyte of lithium-ion secondary battery The content is 0.2% of the compound having the structure of molecular formula 1-2.

Embodiment 3

[0050] Lithium-ion secondary battery is prepared according to the method of Example 1, but in the preparation of the electrolyte of lithium-ion secondary battery (i.e. step (3)), the additive is the mass percentage in the electrolyte of lithium-ion secondary battery The content is 0.5% of the compound having the structure of molecular formula 1-2.

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Abstract

The invention provides a lithium ion secondary battery and an electrolyte thereof. The electrolyte of the lithium ion secondary battery comprises lithium salt, a nonaqueous organic solvent and an additive. The additive comprises a diisocyanate compound, containing ether bonds, which is of a formula 1 structure and/or a formula 2 structure; in the formula 1, m, n and p are integers of 1 to 4 respectively; in the formula 2, x and y are integers of 1 to 4 respectively; and the weight percentage content of the diisocyanate compound, containing ether bonds, which is of the formula 1 structure and/or the formula 2 structure in the electrode of the lithium ion secondary battery is 0.1% to 2.5%. The lithium ion secondary battery comprises a positive plate, a negative plate, an isolating membrane arranged between the positive plate and the negative plate at an interval, and the electrode. The lithium ion secondary battery provided by the invention has high high-temperature storage performance, normal-temperature cycle performance and high-temperature cycle performance under high voltage.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion secondary battery and an electrolyte thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high operating voltage, long life, and fast charging speed. However, with the continuous development of technology, people require lithium-ion secondary batteries to have higher energy density. At present, in order to further increase the energy density of the lithium-ion secondary battery, it is mainly to increase the charge cut-off voltage of the lithium-ion secondary battery, so that a higher proportion of lithium ions is released from the positive electrode to obtain a higher capacity and achieve the purpose of increasing the energy density. However, when the same positive electrode active material is charged to a higher cut-off voltage, it will also increase the oxidation ability of the positive electrode, thus making the oxidatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/10
Inventor 褚春波叶士特付成华
Owner CONTEMPORARY AMPEREX TECH CO
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