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Electrolyte and lithium ion battery using same

A technology of electrolyte and lithium salt, which is applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve problems such as loss, and achieve the effect of ensuring high temperature performance and suppressing side reactions

Active Publication Date: 2015-03-25
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a high-voltage system, especially a battery system higher than 4.35V, inhibitors, especially carbonate inhibitors containing double bonds, will undergo irreversible decomposition reactions due to the high voltage of the cathode, and lose the ability to inhibit side reactions. effect
It is very unfavorable for the use of batteries under high voltage conditions, especially under high temperature and high voltage conditions

Method used

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  • Electrolyte and lithium ion battery using same
  • Electrolyte and lithium ion battery using same
  • Electrolyte and lithium ion battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 Electrolyte L1 # ~L13 # preparation of

[0046] The preparation steps of the electrolyte are: mix ethylene carbonate and diethyl carbonate at a volume ratio of 1:2, add chain carbonate, cyclic carbonate containing C=C double bond in chemical structure formula, and other additives , after mixing well, add LiPF 6 , to get LiPF 6 A solution with a concentration of 1 mol / L is the electrolyte.

[0047]The numbering of gained electrolytic solution and electrolytic solution form (the kind of chain carbonate and the mass percent composition in electrolytic solution, the kind and the quality of the cyclic carbonate that contains C=C double bond in the chemical structural formula percentage content, whether to add additives, and the mass percentage content of additives in the electrolyte) are shown in Table 1.

Embodiment 2

[0053] Example 2 Battery C1 # ~C13 # 、DC1 # ~DC8 # production

[0054] Production of the positive electrode sheet:

[0055] The positive electrode active material lithium cobaltate (molecular formula is LiCoO 2 ), the conductive agent acetylene black, and the binder polyvinylidene fluoride (abbreviated as PVDF) are fully stirred and mixed in an appropriate amount of N-methylpyrrolidone (abbreviated as NMP) solvent in a weight ratio of 96:2:2 to form Uniform cathode slurry. The slurry was coated on the positive electrode current collector Al foil, dried and cold pressed to obtain the positive electrode sheet.

[0056] Production of negative electrode sheet:

[0057] Negative electrode active material graphite, conductive agent acetylene black, binder styrene-butadiene rubber (abbreviated as SBR), thickener sodium carboxymethyl cellulose (abbreviated as CMC) in an appropriate amount according to the weight ratio of 95:2:2:1 Fully stir and mix in the deionized water solve...

Embodiment 3

[0062] Example 3 Battery High Temperature Storage Performance Test

[0063] Respectively to the lithium ion battery C1 obtained in embodiment 2 # ~C13 # , battery DC1 # ~DC8 # To test the high temperature storage performance, the method is as follows:

[0064] At 25°C, first charge the lithium-ion secondary battery C1 with a constant current of 0.5C. # ~C13 # 、DC1 # ~DC8 # Charge to the charge cut-off voltage of 4.35V, charge at a constant voltage of 4.35V to a current of 0.025C, and then discharge to 3.0V at a rate of 0.5C. The discharge capacity is recorded as the discharge capacity of the battery before storage. Afterwards, charge to 4.35V with a constant current at a rate of 0.5C, and then charge at a constant voltage of 4.35V to a current of 0.025C, so that it is fully charged at 4.35V, and test the thickness and internal resistance of the battery before storage; then, put it in 85°C In the incubator, take it out after 24 hours of storage, test its thickness again...

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Abstract

The invention provides an electrolyte which comprises a nonaqueous organic solvent and lithium salt, wherein the nonaqueous organic solvent contains chain carboxylic ester, a chemical structural formula contains C=C double-bond cyclic carbonate, and the C=C double-bond cyclic carbonate contained in the chemical structural formula is not more than 1% in percentage by weight in the electrolyte. The electrolyte provided by the invention can be used for a long time under the condition of high voltage, can be used in a lithium ion battery, can normally work for a long time under the condition that working voltage is higher than 4.35V and ensures the high-temperature property of a battery.

Description

technical field [0001] The application belongs to the field of batteries, and in particular relates to a non-aqueous electrolyte and a lithium ion battery using the electrolyte. Background technique [0002] Lithium-ion batteries have significant advantages such as high specific energy, high specific power, long cycle life, and small self-discharge. They have been widely used in electronic products such as mobile communications, digital cameras, and video cameras, and have become a hot spot in the development of energy storage and power batteries. . With the wide application of lithium-ion batteries, higher requirements are put forward for their environmental adaptability, and lithium-ion batteries have been used in various environments. [0003] With the development of lithium-ion secondary batteries towards miniaturization and light weight, the requirements for energy density are getting higher and higher. The solution is to increase the working voltage and energy density...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0569H01M2300/0028H01M10/0566Y02E60/10
Inventor 杨丽美李松
Owner DONGGUAN AMPEREX TECH
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