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A kind of non-aqueous electrolyte battery

A non-aqueous electrolyte and battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of reducing battery power performance, increasing battery internal resistance, and failing to improve the activity of active materials, so as to improve high temperature performance, effect of suppressing swelling phenomenon

Active Publication Date: 2011-12-14
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of substance also has some defects, and the coating layer is not easy to control
That is, when the thickness of the coating layer is too thick, the internal resistance of the battery will be significantly increased, thereby reducing the power performance of the battery; when the thickness of the coating layer is too thin, the activity on the active material is likely to be uncoated and no improvement

Method used

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  • A kind of non-aqueous electrolyte battery
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  • A kind of non-aqueous electrolyte battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of positive electrode

[0023] Lithium cobalt oxide (LiCoO 2 ) as the positive electrode active material, PVDF (polyvinylidene fluoride) is used as the binder, and conductive carbon black is used as the conductive agent. piece.

[0024] Preparation of negative electrode

[0025] High-energy-density graphite is used as the negative electrode active material, SBR (polystyrene, butadiene suspension) is used as the binder, CMC (sodium carboxymethylcellulose) is used as the thickener, and conductive carbon black is used as the conductive agent. After the prepared slurry is coated on both sides of the negative electrode current collector composed of copper foil, it is dried and pressed as the negative electrode sheet.

[0026] Preparation of separator

[0027] The isolation film can be made of PE, PP and PP / PE / PP three-layer materials. In order to improve the high temperature stability of the isolation film, a layer of oxide ceramic layer is usually coated on ...

Embodiment 2

[0033]The positive electrode, negative electrode, and separator used in Example 2 are the same as in Example 1. For the specific preparation process, please refer to the preparation of the positive electrode, the negative electrode, and the separator in Example 1.

[0034] Electrolyte preparation

[0035] Mix ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) in a volume ratio of EC:PC:EMC:DEC=1:3:5:1 ; Then add BP of 1wt% and VC of 1wt% and ADV of 0.5wt% in the mixed solvent; With LiFP 6 is the electrolyte salt, the concentration is 1mol / L, and the electrolyte S2 is prepared.

[0036] Preparation of non-aqueous electrolyte battery

[0037] The positive pole piece, negative pole piece and separator obtained in the above preparation process are wound into bare cells, and the outer packaging of the battery is made of aluminum-plastic composite film. The electrolytic solution S2 is made into a soft-package lithium-ion ba...

Embodiment 3 to 5

[0039] The positive electrode, negative electrode, and separator used in Examples 3 to 5 are the same as in Example 1. For the specific preparation process, please refer to the preparation of the positive electrode, the negative electrode, and the separator in Example 1.

[0040] Electrolyte preparation

[0041] Take ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC) and mix, the volume ratio is shown in the table below; with LiFP 6 is the electrolyte salt, the concentration is 1mol / L, and the electrolytes S3, S4, and S5 are prepared respectively.

[0042] The electrolyte solvent ratio that table 1 makes to embodiment 3 to 5

[0043] Example

Electrolyte number

Solvent ratio (mass ratio) used in electrolyte preparation

Example 3

S3

EC:PC:EMC:DEC=1:3:1:5+0.1%BP+3%VC+0.5%ADV

Example 4

S4

EC:PC:EMC:DEC=1:2:7:0+2%BP+1%VC+1%VA

Example 5

S5

EC:PC:EMC:DEC=3:2:2:3+...

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Abstract

The present invention relates to the technical field of lithium ion batteries, in particular to a non-aqueous electrolyte battery, comprising a positive electrode and a positive electrode active material, a negative electrode and a negative electrode active material, a separator and a non-aqueous electrolyte, the non-aqueous electrolyte containing a solvent, an electrolyte and additives; the electrolyte is lithium hexafluorophosphate; the solvent is a mixture of ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC), the carbonic acid The content of vinyl ester (EC) is 0%-40wt%, the content of the propylene carbonate (PC) is 10-40wt%, the content of the diethyl carbonate (DEC) is 5-50wt%, the carbonic acid The content of ethyl methyl ester (EMC) is 0-60wt%; the additive is biphenyl (BP), and the invention can suppress high-temperature expansion and improve high-temperature performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a nonaqueous electrolyte battery with good high temperature performance. Background technique [0002] In daily life, small rechargeable lithium-ion batteries have been widely used in electronic products, such as mobile phones, music players, portable DVD and GPS navigators, etc. In recent years, when the low-carbon economy is in the ascendant, power vehicles and grid energy storage have developed rapidly, and rechargeable lithium-ion batteries have also faced new challenges. One of the challenges is that the working environment of lithium-ion batteries is becoming more and more changeable and harsh, especially when used as a vehicle power supply, lithium-ion batteries are usually installed in the car in the form of a battery pack. In such a In a relatively confined space, it will be difficult to effectively dissipate the heat generated by the battery during chargi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569
CPCY02E60/12Y02E60/10
Inventor 陈小波王娜袁庆丰夏恒涛
Owner DONGGUAN AMPEREX TECH
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