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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 problem that the high-temperature storage performance and low-temperature discharge performance of the battery cannot be balanced, and achieve the effects of improving the overall output performance, suppressing side reactions, and good low-temperature discharge performance.

Active Publication Date: 2019-10-25
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • 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

[0074]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:

[0075] Mix positive electrode active material NCM811 by the mass ratio of 96.8:2.0:1.2, conductive carbon black and binding agent polyvinylidene fluoride, then disperse in N-methyl-2-pyrrolidone, obtain positive electrode slurry, positive electrode slurry Evenly 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 100 and 115 μm;

[0076] Mix silicon-carbon composite material, conductive carbon black, binder st...

Embodiment 2～ Embodiment 22

[0081] Examples 2 to 22, except that the components in the electrolyte are different, the preparations 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 1-11 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 1-11 shown in the structure in the specification. One of the compounds 1-11 is used as the additive for a battery electrolyte, so a low-impedance stable protective film can be formed on the surface of an electrode (a positive electrode and a negative electrode), thereby achieving the inhibition of the side reaction of the electrode and electrolyte, and reducing the interface impedance. The 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 占孝云林建安伟峰张宇董良
Owner SHENZHEN BAK POWER BATTERY CO LTD
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