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Electrolyte and lithium ion battery including the same

A technology of electrolyte and lithium salt, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems of poor performance of lithium-ion batteries, poor high-temperature cycle performance, and poor high-temperature storage performance, and improve high-temperature cycle performance and rate performance, improved high-temperature storage performance, and the effect of suppressing decomposition

Active Publication Date: 2017-06-16
NINGDE AMPEREX TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] At present, the widely used electrolyte of lithium-ion batteries includes lithium hexafluorophosphate as a conductive lithium salt and a mixture solvent of cyclic carbonate and chain carbonate. However, there are still many deficiencies in the above electrolyte, especially under high voltage, The performance of lithium-ion batteries is poor, such as poor high-temperature cycle performance, poor high-temperature storage performance, and poor rate performance

Method used

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  • Electrolyte and lithium ion battery including the same
  • Electrolyte and lithium ion battery including the same
  • Electrolyte and lithium ion battery including the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～18

[0108] Preparation of Examples 1-18 Lithium-ion Batteries 1-18

[0109] Lithium-ion batteries (referred to as batteries) 1-18 are all prepared according to the following method:

[0110] (1) Preparation of positive electrode sheet

[0111] Lithium cobalt oxide (LiCoO 2 ), binder (polyvinylidene fluoride), conductive agent (acetylene black) according to the weight ratio of LiCoO 2 : polyvinylidene fluoride: acetylene black = 98: 1: 1 to mix, add N-methylpyrrolidone (NMP), stir under the action of a vacuum mixer until the system becomes uniform and transparent, and obtain positive electrode slurry; Coated on an aluminum foil with a thickness of 12 μm; the aluminum foil was dried at room temperature and then transferred to an oven at 120° C. for 1 hour, and then subjected to cold pressing and slitting to obtain a positive electrode sheet.

[0112] (2) Negative sheet preparation

[0113] Graphite, thickener sodium carboxymethylcellulose (CMC), binder styrene-butadiene rubber a...

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Abstract

The invention relates to an electrolyte and a lithium ion battery including the same. The electrolyte comprises a lithium salt, an organic solvent, an additive A and an additive B, wherein the additive A is a dinitrile compound containing carbon-carbon double bonds; and the additive B is a silane phosphate compound and / or a silane boric acid ester compound. After the electrolyte provided by the invention is applied to the lithium ion battery, the high-temperature storage performance, the high-temperature cycle performance and the rate capability of the lithium ion battery can be improved.

Description

technical field [0001] The present application belongs to the field of lithium batteries, and in particular, relates to an electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] In the rapidly developing information age, the demand for mobile phones, notebooks, cameras and other electronic products is increasing year by year. As the working power source of electronic products, lithium-ion batteries have the characteristics of high energy density, no memory effect, and high working voltage, and are gradually replacing traditional Ni-Cd and MH-Ni batteries. However, with the expansion of market demand for electronic products and the development of power and energy storage equipment, people's requirements for lithium-ion batteries continue to increase, and the development of lithium-ion batteries with high energy density and fast charging and discharging has become a top priority. At present, the effective method is to increase the volt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 王小梅付成华唐超
Owner NINGDE AMPEREX TECH
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