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Lithium ion secondary battery electrolyte

A secondary battery and electrolyte technology, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve problems such as graphite peeling, achieve the effect of improving initial discharge capacity and solving graphite peeling

Inactive Publication Date: 2014-06-25
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

[0015] 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.

[0016] 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

[0021] Ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), fluoroethylene carbonate (FEC) (fluoroethylene carbonate is a kind of halogenated cyclic carbonate) and Cyclic phosphonates are mixed according to the mass ratio in Table 1 to obtain an electrolyte solvent, and 1M LiPF is dissolved in the electrolyte solvent 6 That is, a non-aqueous electrolyte solution is obtained.

[0022] 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 ...

Embodiment 2

[0024] Lithium-ion secondary battery was prepared with reference to the method of Example 1, except that when preparing lithium-ion secondary battery electrolyte, 1,2-ethylene glycol ethyl phosphonate was used to replace 1,3-propylene glycol methyl in Example 1 base phosphonate.

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Abstract

The invention discloses lithium ion secondary battery electrolyte comprising a non-aqueous solvent and lithium salt dissolved into the non-aqueous solvent, wherein non-aqueous solvent contains cyclic phosphoric ester accounting for 0.5-15% of the total mass of non-aqueous solvent. Cyclic phosphoric ester has the structural formula as the specification, wherein n is an integer ranging from 0 to 2, and R is a straight-chain or branched-chain alkyl from C1 to C4. A functional additive used by the lithium ion secondary battery electrolyte has a relatively high reduction potential and can be used for forming a layer of compact and stable solid electrolyte passive film (SEI) in the first charging process, so that the co-intercalation of propylene carbonate (PC) to graphite can be effectively inhibited, the initial discharging capacity of a battery can be effectively increased, the cycle life of the battery can be effectively prolonged, and the high-and-low temperature performance of the battery can be effectively improved.

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 batteries are green, high-energy and environmentally friendly batteries that appeared in the 1990s. Due to their advantages such as high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long life, they are widely used in mobile phones. , notebook computers, camcorders, digital cameras and other portable electronic products that emphasize thinness, shortness, and multi-function are rapidly popularized. [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-transi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 王阿忠胡念赖彩娥
Owner XIAMEN SHOUNENG TECH
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