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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 ultra-high voltage in the prior art. The purpose of the invention is to provide a novel ultra-high voltage resistant electrolyte Formula, the electrolyte formula has the characteristics of ultra-high pressure resistance

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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Effect test

Embodiment 1

[0030] (1) Preparation of high-voltage perfluorinated electrolyte: all reagents are stored in a glove box, and the preparation process is also carried out in the glove box. Prepare lithium hexafluorophosphate solution A by preparing lithium hexafluorophosphate salt and main solvent methyl trifluoroethyl carbonate at a mass ratio of 1:3, then add the first co-solvent (fluorinated ethylene carbonate) and lithium hexafluorophosphate at a mass ratio of 1:1 and mix evenly to obtain For solution B, add the second co-solvent (fluorinated borate) equal in quality to the first co-solvent to obtain a high-pressure perfluorinated borate-containing electrolyte.

[0031](2) Assembling a ternary button lithium battery: use a battery case of model 2025, a polyethylene diaphragm, and an NCM811 ternary positive electrode with an active material of 3 mg. The negative electrode uses a lithium sheet with a thickness of 150-300 μm, and the polyethylene diaphragm is placed on the positive electrode....

Embodiment 2

[0034] (1) Preparation of high-voltage perfluorinated electrolyte: the preparation concentration is 1-2mol L -1 Lithium hexafluorophosphate electrolyte, the volume ratio of the main solvent methyl trifluoroethyl carbonate to the first co-solvent fluorinated ethylene carbonate is 3:1, the main solvent methyl trifluoroethyl carbonate and the second co-solvent fluorinated boric acid The ester volume ratio is 3:1, and a colorless clear liquid is obtained after mixing evenly. The preparation process is completed in a glove box filled with protective gas, and the oxygen content in the glove box is kept ≤<=0.1ppm, and the water content≤<=0.1ppm.

[0035] (2) Assemble the ternary button lithium battery: select the stainless steel battery casing (2025) as the positive and negative electrode casings, punch the NCM811 positive electrode sheet with a diameter of 12mm, and prepare a polyethylene separator and a lithium sheet with a thickness of 150-300μm. The ethylene separator was placed...

Embodiment 3

[0039] (1) Preparation of high-voltage perfluorinated electrolyte: mix the lithium hexafluorophosphate salt with the main solvent methyl trifluoroethyl carbonate in a mass fraction of 1:2, and add the first co-solvent with a mass fraction of the main solvent of 1:2. The solvent fluorinated ethylene carbonate, and the second co-solvent fluorinated borate with a mass fraction ratio of 1:2 to the main solvent are finally mixed uniformly to obtain a high-pressure perfluorinated electrolyte.

[0040] (2) Assembling a ternary button lithium battery: Take 25-30 μL of the high-voltage perfluorinated electrolyte prepared in step (1) and drop it into the contact surface of the positive and negative electrodes and the polyethylene diaphragm respectively using a pipette gun. The active mass of NCM811 is 3-4 mg, and the negative electrode uses a lithium sheet with a thickness of 150-300 μm, which is then packaged to obtain a button battery.

[0041] (3) Test the electrochemical performance...

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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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