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Single-lithium-ion conductive polymer lithium salt, lithium secondary battery electrolyte and lithium secondary battery

A technology of conductive polymer and lithium secondary battery, applied in the field of single lithium ion conductive polymer lithium salt, lithium secondary battery electrolyte, can solve the problem of safe lithium salt anion concentration polarization, etc., and achieve excellent lithium ion migration performance, excellent cycle performance, good flame retardancy and stability

Active Publication Date: 2019-07-19
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the first aspect of the embodiment of the present invention provides a single lithium ion conductive polymer lithium salt, which has both flame retardancy and single lithium ion conductivity, so as to simultaneously solve the safety problems and problems caused by the battery electrolyte in the prior art. Concentration Polarization Caused by Lithium Salt Anions

Method used

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  • Single-lithium-ion conductive polymer lithium salt, lithium secondary battery electrolyte and lithium secondary battery
  • Single-lithium-ion conductive polymer lithium salt, lithium secondary battery electrolyte and lithium secondary battery
  • Single-lithium-ion conductive polymer lithium salt, lithium secondary battery electrolyte and lithium secondary battery

Examples

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Embodiment 1

[0068] A lithium secondary battery electrolyte, comprising molecular structure formula such as conductive lithium salt shown in formula (A), by weight ratio of ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) The non-aqueous organic solvent formed by mixing at 30:30:40, and electrolyte additives, the electrolyte additives include the following components in mass percentage: 2% VC, 3% FEC, 3% PS, 2% FB , 3% DN, wherein the concentration of the conductive lithium salt is 1.0mol / L,

[0069]

[0070] Preparation of Lithium Secondary Battery Electrolyte

[0071]In a glove box filled with argon, weigh 1.0 mol of poly(ethylene-p-benzenesulfonyl)(pentafluorocyclotriphosphazene)imide lithium and dissolve it in 2% VC, 3% FEC, 3% PS, 2% FB, 3% DN in a mixed solvent of EC:DMC:EMC weight ratio = 30:30:40, fully stirred evenly, and the lithium secondary battery electrolyte of Example 1 of the present invention was obtained.

[0072] Preparation of lith...

Embodiment 2

[0077] An electrolyte solution for a lithium secondary battery. The difference between this embodiment and Example 1 is that the conductive lithium salt is a conductive lithium salt (poly(ethylene methylene sulfonyl)(pentamethene) Lithium fluorocyclotriphosphazene) imide,

[0078]

[0079] The preparation method of the lithium secondary battery electrolyte and the lithium secondary battery in this embodiment is the same as that of Example 1.

Embodiment 3

[0081] An electrolyte solution for a lithium secondary battery. The difference between this embodiment and Embodiment 1 is that the conductive lithium salt is a conductive lithium salt poly(ethylene-p-benzenesulfonyl)(tetrafluoro- Lithium 3-phenoxycyclotriphosphazene)imide,

[0082]

[0083] The preparation method of the lithium secondary battery electrolyte and the lithium secondary battery in this embodiment is the same as that of Example 1.

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Abstract

The embodiment of the invention provides single-lithium-ion conductive polymer lithium salt, the structural formula of which is shown as a formula (I), wherein Y is -N-C(=O)-R1- or -N-S(=O)2-R2-, R1 and R2 are respectively selected from alkylene, halogenated alkylene, alkyleneoxy, halogenated alkyleneoxy, alkenylene, halogenated alkenylene, alkenylidenoxy, halogenated alkenylidenoxy, arylene, halogenated arylene, arylidenoxy and halogenated arylidenoxy; z1, Z2, Z3, Z4 and Z5 are respectively selected from fluorine, chlorine, bromine, alkyl, halogenated alkyl, alkoxy, halogenated alkoxy, alkenyl, halogenated alkenyl, alkenyl, halogenated alkenyl, aryl, halogenated aryl, aryloxy and halogenated aryloxy. The lithium salt has flame-retardant and single-lithium-ion conductive characteristics, and the safety performance, cycle performance and rate capability of the battery can be improved. The invention also provides a lithium secondary battery electrolyte and a lithium secondary battery.

Description

technical field [0001] The invention relates to the technical field of lithium secondary batteries, in particular to a single lithium ion conductive polymer lithium salt, lithium secondary battery electrolyte and 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. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0566H01M10/0567
CPCH01M10/0525H01M10/0566H01M10/0567Y02E60/10
Inventor 马强李阳兴秦德君
Owner HUAWEI TECH CO LTD
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