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Lithium ion secondary battery electrolyte

A secondary battery and lithium-ion technology, applied in the field of lithium-ion secondary batteries, can solve problems such as graphite peeling, achieve the effects of suppressing co-embedding, improving initial discharge capacity, and solving graphite peeling

Active Publication Date: 2014-10-01
XIAMEN SHOUNENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte solves the problem of graphite stripping caused by the reductive decomposition of the organic solvent in the electrolyte during the charging process of the battery

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0013] The preparation method of the positive electrode sheet is as follows: lithium cobaltate, conductive agent SuperP, and binder PVDF are mixed uniformly at a mass ratio of 96:2.0:2.0 to make a lithium ion secondary battery positive electrode slurry with a certain viscosity, and coated on the set On fluid aluminum foil, the coating amount is 0.0194g / cm 2 , after drying at 85°C, cold pressing; then trimming, cutting, and slitting, and drying at 85°C for 4 hours under vacuum conditions after slitting, and welding the tabs to make lithium-ion di Secondary battery positive.

[0014] The preparation method of the negative electrode sheet is as follows: graphite, conductive agent SuperP, thickener CMC, and adhesive SBR are made into slurry at a mass ratio of 96.5:1.0:1.0:1.5, coated on the current collector copper foil and placed on the Dried at 85°C, the coating weight is 0.0089g / cm 2 After trimming, cutting, and slitting, dry at 110° C. for 4 hours under vacuum conditions aft...

Embodiment 1

[0028] Ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC), and additives vinylene carbonate (VC) (a kind of alkylene carbonate compound) and 6-trimethylsilane base pyrone, mixed according to the mass ratio of Table 1 to obtain the electrolyte solvent, and dissolved in 1M LiPF in the electrolyte solvent 6 That is, a non-aqueous electrolyte solution is obtained.

[0029]Preparation of lithium-ion secondary battery: The positive electrode sheet, negative electrode sheet and separator of the lithium-ion secondary battery prepared according to the aforementioned process are made into a lithium-ion secondary battery with a thickness of 4.2mm, a width of 34mm, and a length of 82mm through a winding process. Batteries were vacuum-baked at 75°C for 10 hours, injected with the above-mentioned non-aqueous electrolyte, and left to stand for 24 hours, then charged to 4.2V with a constant current of 0.1C (160mA), and then charged at a constant voltage of 4.2V un...

Embodiment 2

[0031] The lithium ion secondary battery was prepared with reference to the method of Example 1, except that when preparing the electrolyte solution of the lithium ion secondary battery, the 6-trimethylsilylpyrone in Example 1 was replaced by 1% by mass percentage. The mass percent content is 0.5% of 6-trimethylsilylpyrone.

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Abstract

The invention discloses lithium ion secondary battery electrolyte which comprises a non-aqueous organic solvent and lithium salt dissolved in the non-aqueous organic solvent, wherein the non-aqueous organic solvent contains 6-trimethyl silicon-based pyrone which accounts for 0.5%-5% of the non-aqueous organic solvent in total mass; the structure formula of the 6-trimethyl silicon-based pyrone is described in the specification. An additive containing the 6-trimethyl silicon-based pyrone described in the molecular structural formula is added into the lithium ion secondary battery electrolyte; since the additive has a high reduction potential, a compact and stable solid electrolyte passivation membrane (SEI) can be formed in the process of charging for the first time, so that the co-embedding of propylene carbonate (PC) on graphite can be effectively suppressed, the initial discharge capacity of the battery can be effectively increased, the cycle life of the battery is prolonged, the high and low temperature performance of the battery can be effectively improved, and the problem of the stripping of the graphite in the battery in the charging process can be effectively avoided.

Description

technical field [0001] The invention relates to a lithium ion secondary battery, in particular to a lithium ion secondary battery and an electrolytic solution thereof which can improve battery cycle performance. Background technique [0002] Lithium-ion secondary batteries have the advantages of high working voltage, long life and fast charging speed. However, with the continuous development of technology and users' demand for fast use of electronic products, people hope that lithium-ion secondary batteries have better cycle performance. , At the same time, it is also required that the lithium-ion secondary battery can be used normally at a higher temperature. [0003] Graphite is the most commonly used negative electrode material for lithium-ion batteries, and it is also the most widely used electrode material at present. During the first charging process of the battery, the lithium ions released by the lithium-transition metal oxide of the positive electrode of the batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567C07F7/08
CPCC07F7/0814H01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 王阿忠胡念赖彩娥
Owner XIAMEN SHOUNENG TECH
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