Novel ultrahigh-voltage-resistant electrolyte as well as preparation method and application thereof

An electrolyte and ultra-high voltage technology, which is applied in the direction of electrolyte, secondary battery manufacturing, non-aqueous electrolyte storage battery, etc., can solve the problems of ternary electrode collapse, unstable electrolyte charge and discharge, etc., and achieve excellent cycle performance and operation Simple, excellent cycle performance effect

Pending Publication Date: 2022-01-14
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The invention solves the technical problems that the electrolyte solution is unstable in charge and discharge under ultra-high voltage and the structure of the ternary electrode is easy to collapse under ultr

Method used

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  • Novel ultrahigh-voltage-resistant electrolyte as well as preparation method and application thereof
  • Novel ultrahigh-voltage-resistant electrolyte as well as preparation method and application thereof
  • Novel ultrahigh-voltage-resistant electrolyte as well as preparation method and application thereof

Examples

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Example Embodiment

[0029] Example 1

[0030] (1) Preparation of high pressure perfluorinated electrolyte: All reagents are stored in a glove working case, and the formulation process is also carried out in a glove workbox. The hexafluorophosphate salt and the main solvent methyl trifluoroethyl carbonate were formulated by 1: 3 to obtain hexafluorophosphate solution A, which was subsequently added to the first co-solvent (vinyl carbonate) and lithium hexafluorophosphate mass than 1: 1. Solution B, a second co-solvent (fluorinated borate) such as a mass such as a first canture is added to obtain a high pressure perfluorinated acid ester electrolyte.

[0031](2) Assembly of a three-dimensional buckle-type lithium battery: a battery case, polyethylene separator, and an active material having a 3 mg of NCM811, a lithium sheet having a thickness of 150-300 μm, and the polyethylene membrane is placed in a positive electrode. The electrolytic solution prepared by 30 μl of step (1) is added dropwise in the m...

Example Embodiment

[0033] Example 2

[0034] (1) Preparation of high pressure perfluorination electrolyte: formulated concentration is 1-2 mol L -1 Lithium hexafluorophosphate, main solvent methyl trifluoroethyl carbonate and the first cosmetic fluorinated vinyl carbonate volume ratio of 3: 1, main solvent methyl trifluoroethyl carbonate and second cosmetic fluoride acid acid The ester volume ratio is 3: 1, and the colorless clarification liquid is obtained after mixing. The formulation process is completed in the protective gas gloves, and keeps oxygen content in the glove operating case ≤ <= 0.1 ppm, water content ≤ = 0.1 ppm.

[0035] (2) Assembly three-yuan buckle-type lithium battery: use stainless steel battery case (2025) as a positive and negative pole shell, a NCM811 positive electrode sheet having a diameter of 12 mm, is prepared, and a lithium film having a thickness of 150-300 μm. The ethylene diaphragm is placed in the middle and the electrolyte prepared by 25 μl of step (1) is added dr...

Example Embodiment

[0038] Example 3

[0039] (1) Preparation of high pressure perfluorinated electrolyte: 1: 2 hexafluorophosphate salts and main solvent methyl trifluoroethyl carbonate is mixed uniform, and the number of main solvent mass parts is added 1: 2 Solvent fluorinated carbonate, and a second culechal fluoride acid ester having a ratio of the main solvent mass of 1: 2, and finally mixed uniformly obtained high pressure perfluorinated electrolyte.

[0040] (2) Assembly of a three-dimensional buckle lithium battery: The high-pressure perfluorinated electrolyte prepared in step (1) is equipped with a pipetting gun to take 25-30 μL of the contact surface of the positive electrode and the polyethylene separator, and the positive electrode The NCM811 of the active mass of 3-4 mg, the negative electrode uses a lithium sheet having a thickness of 150-300 μm, and then encapsulates to obtain a buckle battery.

[0041] (3) Electrochemical properties of the tested battery under ultra-high pressure: Pa...

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Abstract

The invention relates to a novel ultrahigh-voltage-resistant electrolyte as well as a preparation method and application thereof, and belongs to the technical field of battery electrolytes. The electrolyte comprises 2-3 parts by mass of a main solvent, 1-2 parts by mass of a lithium salt, 1-2 parts by mass of a first cosolvent and 1-2 parts by mass of a second cosolvent; the first cosolvent is a multielectron solvent, and the second cosolvent is an electron-deficient solvent; the first cosolvent and the second cosolvent are combined to enable the electrolyte to form a stable solvent structure; and the second cosolvent is used for preventing the lithium salt from being decomposed. In the invention, the main solvent is chain-shaped fluorocarbonate, the first cosolvent is cyclic fluorocarbonate, and the second cosolvent is fluoroborate. The oxidation potential of a linear scanning curve (LSV) of the battery electrolyte is 5V, the defect that the structure of the current nickel-cobalt-manganese ternary (NCM811) positive electrode is collapsed under high-voltage circulation is overcome, and stable charge-discharge cycle performance can be kept under the ultrahigh voltage of 4.7 V.

Description

technical field [0001] The invention belongs to the technical field of battery electrolytes, and more specifically relates to a novel ultra-high-voltage resistant electrolyte and its preparation method and application, in particular to a novel ultra-high-voltage resistant perfluorinated electrolyte and its preparation method and application. Background technique [0002] Electrolyte is one of the core research directions of lithium battery industry, among which the formula of electrolyte is the most core technology. On the one hand, the fluorine-containing electrolyte solution has recognized flame retardancy and high voltage (≤4.4V) characteristics, and on the other hand, the fluorine-containing electrolyte is conducive to the formation of a dense SEI layer to obtain better battery cycle performance. Borate co-solvents have been intensively studied by researchers because of their boron element, which is more friendly to the positive electrode. Among them, silane borates have...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0568H01M10/052H01M10/04
CPCH01M10/0569H01M10/0568H01M10/052H01M10/0427H01M2300/004Y02E60/10Y02P70/50
Inventor 郭新王哲李卓
Owner HUAZHONG UNIV OF SCI & TECH
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