Additives for battery electrolyte, lithium-ion battery electrolyte, lithium-ion battery

A lithium-ion battery and electrolyte technology, applied in battery electrodes, secondary batteries, organic electrolytes, etc., can solve the problems of high temperature storage performance and low temperature discharge performance of batteries, etc., to improve the overall output performance, reduce interface impedance, The effect of improving cycle performance and low temperature discharge performance

Active Publication Date: 2022-03-29
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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  • Additives for battery electrolyte, lithium-ion battery electrolyte, lithium-ion battery
  • Additives for battery electrolyte, lithium-ion battery electrolyte, lithium-ion battery
  • Additives for battery electrolyte, lithium-ion battery electrolyte, lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] 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:

[0084] 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 aluminum lead wires with an ultrasonic welder to obtain a positive plate (positive plate), the thickness of the plate is between 135 and 160 μm;

[0085] Mix silicon-carbon composite material, conductiv...

Embodiment 2～ Embodiment 10

[0090] Examples 2 to 10, except that the components in the electrolyte are different, the preparation of all the other positive poles, negative poles, separators, and lithium-ion secondary batteries are the same as in Example 1. In each example, the first type of additive (compound (1) The selection and content of at least one of -(7) are shown in Table 2.

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Abstract

The invention provides an additive for a battery electrolyte, which at least includes one of the compounds represented by the structural formula (1)-(7) herein. The additive for battery electrolyte provided by the invention can form a low-impedance protective film on the surface of the electrode, suppress side reactions between the electrode and the electrolyte, reduce interface impedance, take into account high and low temperature performance, and improve the overall output performance of the lithium-ion battery.

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 Patents(China)
IPC IPC(8): H01M10/0567H01M10/0566H01M10/0525
CPCH01M10/0567H01M10/0566H01M10/0525H01M2300/0025Y02E60/10H01M4/525H01M4/505H01M4/386H01M4/587H01M4/364
Inventor 林建占孝云安伟峰
Owner SHENZHEN BAK POWER BATTERY CO LTD
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