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Long-circulation non-aqueous electrolyte battery and preparation method therefor

A non-aqueous electrolyte and long-cycle technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of complex equipment and cumbersome procedures, and achieve the goals of improving high-temperature cycle life, wide application prospects, and excellent high-temperature cycle performance of batteries Effect

Inactive Publication Date: 2017-05-31
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patents have no restrictions on the selection of battery material systems and have good universality, but there are also shortcomings such as cumbersome procedures and complicated equipment.

Method used

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  • Long-circulation non-aqueous electrolyte battery and preparation method therefor
  • Long-circulation non-aqueous electrolyte battery and preparation method therefor
  • Long-circulation non-aqueous electrolyte battery and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Positive sheet production: nickel-cobalt lithium manganese oxide (LiNi 0.5 co 0.2 mn 0.3 o 2 ): carbon conductive agent: polyvinylidene fluoride powder (PVDF) is mixed, dispersed in N-methylpyrrolidone (NMP) to make positive electrode slurry, the above positive electrode slurry is coated on both sides of 20 μm metal aluminum foil, and dried , rolling, and cutting processes to prepare the positive electrode sheet.

[0038] (2) Negative electrode sheet production: Mix graphite: acetylene black: PVDF in a weight ratio of 95:1:4, disperse in NMP solvent to make negative electrode slurry, and coat the above negative electrode slurry on 10 μm metal copper foil The negative electrode sheet is obtained by drying, rolling, and cutting processes on both sides.

[0039] (3) Preparation of non-aqueous electrolyte: mix ethylene carbonate (EC) and ethyl methyl carbonate (EMC) in a ratio of 1:2 by volume, and in the mixed solvent, control the concentration of lithium hexafluor...

Embodiment 2

[0045] Compared with Example 1, the only difference is that the shape memory polymer material is styrene-butadiene copolymer, and its heat distortion temperature is 60°C.

[0046] The rest are the same as in Embodiment 1, and will not be repeated here. Hereinafter, the battery thus produced is referred to as battery A2.

Embodiment 3

[0048] Compared with Example 1, the only difference is: the separator substrate uses a microporous polypropylene film with a thickness of 20 μm, the functional coating uses styrene-butadiene rubber with a thickness of 2 μm, and the separator has a porosity of 40%.

[0049] The rest are the same as in Embodiment 1, and will not be repeated here. Hereinafter, the battery thus produced is referred to as battery A3.

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Abstract

The invention relates to a long-circulation non-aqueous electrolyte battery. The long-circulation non-aqueous electrolyte battery comprises a cell and a shape memory polymer material which tightly coats the outer surface of the cell. The shape memory polymer material is introduced to the non-aqueous electrolyte battery; the shape memory polymer material tightly coats the outer surface of the cell, so that shrinkage at a high temperate can be generated to tightly press a diaphragm and an electrode plate to maintain high contact between the diaphragm and the electrode plate; and therefore, the cycle life of the battery can be effectively prolonged, and particularly, the cycle life can be obviously prolonged at a high temperature. The invention further provides a preparation method for the long-circulation non-aqueous electrolyte battery. The preparation method provided by the invention has no limitation on selection of a battery material system, and has high universality; and in addition, the operation process can be implemented simply and easily, so that the preparation method is applicable to industrial scale production and has wide application prospect.

Description

technical field [0001] The invention relates to a nonaqueous electrolyte battery and a preparation method thereof, in particular to a nonaqueous electrolyte battery with long cycle life and a preparation method thereof. Background technique [0002] Non-aqueous electrolyte batteries represented by lithium-ion batteries have the characteristics of high voltage, high energy density, and environmental friendliness. They are used in electronic products, electric tools, new energy vehicles, etc., bringing great convenience to people's daily life . The cycle life of a lithium-ion battery is an important indicator to measure its performance, but lithium-ion batteries are very sensitive to operating temperature. Under high temperature, the positive electrode material dissolves, the negative electrode SEI film decomposes, the electrolyte reacts to produce gas, and the battery bulges and other factors will deteriorate the battery cycle life. , limiting the further application of lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0583H01M10/0585
CPCH01M10/0459H01M10/0525H01M10/0583H01M10/0585Y02E60/10Y02P70/50
Inventor 刘源庞静李翔王曦张强魏得勋
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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