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High-voltage lithium ion battery and electrolyte thereof

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries and their electrolytes, can solve problems such as capacity attenuation, battery volume expansion, and potential safety hazards, to reduce gas generation, improve cycle performance, and improve high-temperature storage performance and safety performance

Active Publication Date: 2013-05-01
NINGDE AMPEREX TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the significant enhancement of the oxidation ability of the positive electrode material at high voltage, the solvent of the electrolyte is oxidized to generate gas during high-temperature storage, which causes the battery volume to expand, and at the same time causes capacity attenuation and safety hazards

Method used

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  • High-voltage lithium ion battery and electrolyte thereof
  • High-voltage lithium ion battery and electrolyte thereof
  • High-voltage lithium ion battery and electrolyte thereof

Examples

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Embodiment 1

[0028] Prepare the positive electrode sheet of lithium ion battery: dissolve polyvinylidene fluoride (PVDF) with a mass percentage of 3% in 1-methyl-2-pyrrolidone solution, and lithium cobaltate (LiCoO 2 ), mass percent 3% conductive agent carbon black is added to the above solution and mixed uniformly, after the mixed slurry is coated on both sides of the positive electrode collector composed of aluminum foil, it is dried and pressed as the positive electrode sheet, and the compacted density of the positive electrode is 4.0g / cm 3 .

[0029] Prepare the negative electrode sheet of the lithium ion battery: the binder that the mass percentage is 4% SBR (polystyrene, butadiene suspension), the thickener that the mass percentage is 1% CMC (sodium carboxymethyl cellulose) Dissolve in an aqueous solution, add 95% graphite by mass to the above solution, mix evenly, coat the mixed slurry on both sides of the negative electrode current collector composed of copper foil, dry and press ...

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Abstract

The invention provides a high-voltage lithium ion battery and electrolyte thereof. The electrolyte of the high-voltage lithium ion battery comprises non-aqueous organic solvent and lithium salt which is dissolved in the non-aqueous organic solvent. To calculate by the total mass of the solvent and additives of the high-voltage lithium ion battery, the non-aqueous organic solvent comprises the following components mass percentage: 35-53 percent of cyclic carbonate, 17-39 percent of chain carbonate and 15-30 percent of fluorobenzene (FB). The electrolyte of the high-voltage lithium ion battery additionally comprises at least one of the following additives by mass percentages: 0.5-10 percent of vinylene carbonate (VC), 3-15 percent of fluoroethylene carbonate (FEC) and 1-7 percent of 1, 3-propanesultone (PS). The high-voltage lithium ion battery comprises a positive plate, a negative plate, a diaphragm which is arranged between the positive plate and the negative plate close to each other, and electrolyte which is the electrolyte of the high-voltage lithium ion battery. Therefore, gas which is produced by the battery during high-temperature storage under high voltage can be reduced, the high-temperature storage performance and the safety performance of the battery are improved and the circulating performance of the battery under the high voltage is improved.

Description

technical field [0001] The invention relates to a lithium ion battery and its electrolyte, in particular to a high-voltage lithium ion battery and its electrolyte. Background technique [0002] The energy problem is a common problem faced by mankind in the 21st century, and electric energy is the most convenient form of energy. In order to store electric energy and meet the needs of the rapid development of the electronics industry and the development of electric vehicles, various types of batteries have emerged as the times require. Among them, lithium-ion batteries are favored by the world because of their excellent characteristics such as high reversible capacity, high voltage, high cycle performance and high energy density. Therefore, they are called the leading power source in the 21st century and their application fields continue to expand. With the improvement of people's requirements for energy density, lithium-ion batteries with high voltage systems such as 4.3V and...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 杨建东袁庆丰陈小波赵丰刚
Owner NINGDE AMPEREX TECH
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