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Additive for battery electrolyte, lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of high-temperature storage performance and low-temperature discharge performance of the battery, etc., to improve the overall output performance, improve cycle performance and low-temperature discharge performance, and suppress side reactions Effect

Active Publication Date: 2019-11-22
SHENZHEN BAK POWER BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an additive for battery electrolyte, aiming to solve the problem that the electrolyte solution oxidizes and decomposes under high temperature conditions in existing lithium ion batteries, which leads to the problem that the high temperature storage performance and low temperature discharge performance of the battery cannot be balanced

Method used

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  • Additive for battery electrolyte, lithium ion battery electrolyte and lithium ion battery
  • Additive for battery electrolyte, lithium ion battery electrolyte and lithium ion battery
  • Additive for battery electrolyte, lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0078] A lithium-ion secondary battery comprises a positive pole, a negative pole, a diaphragm and an electrolyte, wherein the positive pole active material is nickel-cobalt lithium manganese oxide (NCM811) material; the negative pole active material is a silicon-carbon composite material (Si / C), and the The preparation method of lithium ion secondary battery comprises the following steps:

[0079] Mix the positive electrode active material NCM811, conductive carbon black and binder polyvinylidene fluoride according to the mass ratio of 96.8:2.0:1.2, and disperse them in N-methyl-2-pyrrolidone to obtain the positive electrode slurry, and make the positive electrode slurry uniform Coated on both sides of the aluminum foil, after drying, calendering and vacuum drying, and welding the aluminum lead-out wire with an ultrasonic welder to obtain a positive plate (positive plate), the thickness of the plate is between 135 and 155 μm;

[0080] Mix silicon-carbon composite material, co...

Embodiment 2～ Embodiment 14

[0085] Examples 2 to 14, except that the components in the electrolyte are different, the preparation of the other positive poles, negative poles, separators, and lithium-ion secondary batteries are the same as in Example 1, and the first type of additives (compounds 1-17 The selection and content of at least one of them are shown in Table 2.

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Abstract

The invention provides an additive for a battery electrolyte. The additive at least comprises one of compounds as shown in structural formulas 1-17. One of the compounds shown in the formulas 1-17 isused as an additive for the battery electrolyte, a low-impedance stable protective film can be formed on the surface of an electrode (a positive electrode and a negative electrode), side reaction of the electrode and electrolyte is inhibited, interface impedance is reduced, high and low temperature performance (good low-temperature discharge performance, good cycle performance and good high-temperature storage performance) is considered, and the overall output performance of the lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an additive for battery electrolyte, a lithium ion battery electrolyte and a lithium ion battery. Background technique [0002] Lithium-ion secondary battery is the most competitive battery of the new generation, known as "green energy", and is the preferred technology to solve contemporary environmental pollution and energy problems. In recent years, lithium-ion secondary batteries have achieved great success in the field of high-energy batteries, but consumers still expect batteries with higher comprehensive performance, which depends on the research and development of new electrode materials and electrolyte systems. At present, electronic digital products such as smartphones and tablet computers have higher and higher energy density requirements for batteries, making it difficult for commercial lithium-ion secondary batteries to meet the requirements....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 占孝云林建张宇
Owner SHENZHEN BAK POWER BATTERY CO LTD
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