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Method for improving high-temperature storage performance of lithium ion battery

A lithium-ion battery, storage performance technology, applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, secondary battery repair/maintenance, etc., can solve the problems of high temperature storage performance deterioration, cycle performance deterioration, limitations, etc., to improve high temperature Effects of storage performance, reduced flatulence, and ease of operation

Active Publication Date: 2012-07-04
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can improve the high-temperature storage performance of lithium-ion batteries to a certain extent, this method is subject to certain limitations.
For example, when the cycle performance and high-temperature storage performance are required to be further improved at the same time, the two results will appear contradictory: when the content of the fluoroethylene carbonate additive increases, although the cycle performance of the battery can be improved, the high-temperature storage performance of the battery will decrease. However, if the content of organic dinitriles is increased in order to ensure that the high-temperature storage performance of the battery is not affected, the cycle performance will deteriorate

Method used

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  • Method for improving high-temperature storage performance of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of positive electrode sheet:

[0027] Lithium Cobalt Oxide (LiCoO) 2 ), the conductive agent acetylene black, and the adhesive polyvinylidene fluoride (PVDF) are added to the solvent N-methylpyrrolidone (NMP) in a mass ratio of 96:1.5:2.5 to be uniformly dispersed to prepare a positive electrode slurry. Then the positive electrode slurry was coated on Al foil (thickness of 12 μm), and then rolled, sliced, and dried to prepare a positive electrode sheet.

[0028] Preparation of negative electrode sheet:

[0029] Add the negative electrode active material graphite, conductive agent acetylene black, binder styrene-butadiene rubber emulsion and thickener sodium carboxymethyl cellulose according to the mass ratio of 94:1.5:2.5:2 into the solvent water, mix well, and stir well to prepare the negative electrode Slurry. Then, the negative electrode slurry was coated on Cu foil (thickness of 16 μm), and then rolled, sliced, and dried to prepare a negative electrode sheet....

Embodiment 2

[0035] The difference from Example 1 is that the additives in the electrolyte are fluoroethylene carbonate (FEC) accounting for 1% by weight of the total weight of the electrolyte and adiponitrile accounting for 1% by weight of the total weight of the electrolyte.

[0036] The pre-heat treatment conditions are: place the cell in an oven at 80°C for 3 hours, immediately cool it to room temperature and keep it at room temperature for 3 days.

[0037] Others are the same as Embodiment 1, and will not be repeated here.

Embodiment 3

[0039] The difference from Example 1 is that the additives in the electrolyte are fluoroethylene carbonate (FEC) accounting for 5 wt% of the total weight of the electrolyte and glutaronitrile accounting for 5 wt% of the total weight of the electrolyte.

[0040] The pre-heat treatment conditions are as follows: place the cell in an oven at 55°C for 7 days, and cool to room temperature.

[0041] Others are the same as Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a method for improving the high-temperature storage performance of a battery on the premise that the battery cycle performance of the battery is not influenced. The method comprises the following steps of: 1, winding a cathode plate, a diaphragm and an anode plate to form a battery core, putting the battery core into a package bag, injecting electrolyte into the package bag, and performing reduction, shaping and capacity measurement to obtain a lithium ion battery, wherein the electrolyte comprises fluoro ethylene carbonate and organic dinitrile substances; and 2, fully charging the lithium ion battery which is obtained in the step 1, and preheating the fully-charged lithium ion battery at a temperature of between 55 and 80 DEG C. Compared with the prior art, the method overcomes the defects that when the organic dinitrile type substances and the fluoro ethylene carbonate (FEC) serving as additives are added into the electrolyte at the same time, the cycle performance and the high-temperature storage performance of the battery core cannot be improved at the same time; and the high-temperature storage performance of the battery is further improved on the premise that the cycle performance of the battery core is not influenced. Besides, the method also has the advantages of simple operation, easy control and the like.

Description

Technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and particularly relates to a method for improving the high-temperature storage performance of the battery without affecting the cycle performance of the battery. Background technique [0002] With the continuous development of modern society and science and technology, electronic products such as notebook computers, tablet computers and mobile phones have been widely used. As a green power source, lithium-ion batteries are widely used in various electronic products due to their high energy density, long cycle life and low self-discharge rate. [0003] However, the current competition for electronic products is becoming increasingly fierce, and customers' requirements for energy density continue to increase. However, the high-energy density graphite currently on the market has a relatively regular layered structure, which is susceptible to exfoliation caused by the co-embedding of propyle...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/42
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 李枝贤周铁刚张天静陈轩罗丹王会勤严宏伟
Owner DONGGUAN AMPEREX TECH
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