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A kind of electrolyte additive, lithium secondary battery electrolyte and lithium secondary battery

A technology of electrolyte additive and lithium secondary battery, applied in the field of electrolyte additive, lithium secondary battery electrolyte and lithium secondary battery, can solve the problems of poor cycle performance, poor safety and reliability of lithium secondary battery, etc.

Active Publication Date: 2021-08-20
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the first aspect of the embodiment of the present invention provides an electrolyte additive, which has the dual characteristics of flame retardancy and high voltage resistance, so as to solve the problem of poor cycle performance, safety and reliability of existing lithium secondary batteries under high voltage. sex problem

Method used

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  • A kind of electrolyte additive, lithium secondary battery electrolyte and lithium secondary battery
  • A kind of electrolyte additive, lithium secondary battery electrolyte and lithium secondary battery
  • A kind of electrolyte additive, lithium secondary battery electrolyte and lithium secondary battery

Examples

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Embodiment 1

[0077] A kind of lithium secondary battery electrolyte, comprises conductive lithium salt (LiPF 6 ), a non-aqueous organic solvent formed by mixing EC, EMC, DEC and PC in a weight ratio of 35:25:25:15, and an electrolyte additive including a molecular structural formula such as formula (A), wherein the conductive lithium Salt (LiPF 6 ) concentration is 1.0mol / L, and the mass percentage of the electrolyte additive A is 2%,

[0078]

[0079] The preparation of the above-mentioned lithium secondary battery electrolyte of the present embodiment:

[0080] In a glove box filled with argon gas, EC, EMC, DEC and PC were mixed to form a non-aqueous organic solvent, and electrolyte additive A was added to the above-mentioned non-aqueous organic solvent, and then fully dried conductive lithium salt (LiPF 6 ) was dissolved in the above solvent, stirred and mixed evenly, and the lithium secondary battery electrolyte of Example 1 of the present invention was obtained.

[0081] Prepara...

Embodiment 2

[0086] The difference between this embodiment and embodiment 1 is that the mass percentage of the electrolyte additive A is 5%.

Embodiment 3

[0088] The difference between this example and Example 1 is that the mass percentage of the electrolyte additive A is 10%.

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Abstract

An embodiment of the present invention provides a battery electrolyte additive for terminals, smart cars or electric cars, its molecular structure includes a six-membered ring structure composed of three nitrogen atoms and three phosphorus atoms, each phosphorus atom Including two substituent groups, the substituent groups are represented as R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , the R 1 , R 2 , R 3 , R 4 , R 5 , R 6 At least one substituent group is a substituted sulfonic acid group, and the remaining substituent groups are selected from fluorine, chlorine, bromine, alkyl, haloalkyl, alkoxy, haloalkoxy, alkenyl, haloalkenyl, alkenyloxy group, haloalkenyloxy group, aryl group, haloaryl group, aryloxy group, haloaryloxy group, substituted phosphate group, substituted imide group or substituted sulfonimide group. The electrolyte additive has dual characteristics of flame retardancy and high voltage resistance, and its application to lithium secondary batteries can effectively improve the high-voltage cycle performance and safety reliability of lithium secondary batteries. The invention also provides the lithium secondary battery electrolyte and the lithium secondary battery.

Description

technical field [0001] The invention relates to the technical field of lithium secondary batteries, in particular to an electrolyte additive, a lithium secondary battery electrolyte and a lithium secondary battery. Background technique [0002] Due to the advantages of high energy density, high working voltage, long service life, low self-discharge rate and environmental friendliness, lithium secondary batteries have been widely used in portable electronic products (smart phones, digital cameras, notebook computers, etc.), With the rapid development of new energy industries such as electric vehicles and large-scale energy storage grids, higher requirements are placed on the energy density of batteries. Among them, the development of high specific capacity positive and negative electrode materials and high voltage positive electrode materials is currently the key to improving lithium secondary batteries. The main technical means of energy density. However, focusing on the us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/052H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10H01M4/131H01M10/0569H01M2004/021
Inventor 马强李阳兴秦德君
Owner HUAWEI TECH CO LTD