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Electrolyte and lithium ion battery

An electrolyte and lithium salt technology, applied in the field of secondary batteries, can solve problems such as insufficient storage performance and cycle performance, and achieve the effects of improving high-temperature storage performance and cycle performance, reducing side reactions, and stabilizing the structure

Pending Publication Date: 2021-08-13
HIGHPOWER TECH HUIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of insufficient storage performance and cycle performance of existing lithium-ion batteries, the invention provides an electrolyte and lithium-ion batteries

Method used

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  • Electrolyte and lithium ion battery
  • Electrolyte and lithium ion battery
  • Electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment is used to illustrate the electrolyte solution, lithium-ion battery and preparation method thereof disclosed in the present invention, including the following steps:

[0049] Electrolyte preparation:

[0050] Mix ethylene carbonate (EC), diethyl carbonate (DEC), and propylene carbonate (PC) in a mass ratio of 1:1:1 as an organic solvent. Add the additive shown in Example 1 in Table 1 to the organic solvent, after mixing evenly, add LiPF6 , to get LiPF 6 Electrolyte with a concentration of 1.1mol / L.

[0051] Production of the positive electrode sheet:

[0052] The positive electrode active material lithium cobaltate (LiCoO 2 ), the conductive agent carbon nanotube (CNT), and the binder polyvinylidene fluoride are fully stirred and mixed in N-methylpyrrolidone solvent at a weight ratio of 97:1.5:1.5 to form a uniform positive electrode slurry. The positive electrode slurry is coated on the positive electrode current collector Al foil, dried, and cold p...

Embodiment 2～8

[0059] Embodiments 2 to 8 are used to illustrate the electrolyte, lithium ion battery and preparation method thereof disclosed in the present invention, including the operation steps of Embodiment 1, and the differences are:

[0060] The electrolyte additives shown in Examples 2-8 in Table 1 were used.

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PUM

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Abstract

In order to solve the problem that an existing lithium ion battery is insufficient in storage performance and cycle performance, the invention provides an electrolyte which comprises a solvent, a lithium salt and an additive. The additive comprises 1, 3, 2-dioxothioxane-2, 2-dioxide and ethylene difluorocarbonate. Based on the total mass of the electrolyte being 100%, the mass percentage content of the 1, 3, 2-dioxathioxane-2, 2-dioxide is 0.1%-5%, and the mass percentage content of the ethylene difluorocarbonate is 0.1%-10%. The invention also discloses a lithium ion battery comprising the electrolyte. The electrolyte provided by the invention can effectively improve the high-temperature storage performance and cycle performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to an electrolyte solution and a lithium ion battery. Background technique [0002] Lithium-ion batteries are warmly welcomed by consumers because of their significant advantages such as high specific energy, high specific power, long cycle life, and small self-discharge. They are widely used in portable electronic product markets such as mobile phones, digital cameras, and personal computers. It has become an important choice in the field of power and energy storage, and is of great significance to the development of "low-carbon economy". [0003] At present, in order to improve the energy density of lithium-ion batteries, researchers usually develop high-capacity, high-voltage anode materials to solve this problem, such as improving the working voltage of lithium-cobalt composite oxides and lithium-manganese composite oxides, and developing high-voltage li...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/058H01M10/0525H01M10/42
CPCH01M10/0567H01M10/058H01M10/0525H01M10/4235Y02P70/50Y02E60/10
Inventor 李枫张昌明李引弟
Owner HIGHPOWER TECH HUIZHOU
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