A kind of high-voltage solid-state battery composite positive electrode and preparation method thereof

A composite cathode, solid-state battery technology, used in battery electrodes, positive electrodes, lithium batteries, etc., can solve the problems of low battery cut-off voltage, difficult to match high-voltage positive stage, etc., to achieve increased volume energy density, low impedance, and enhanced lithium ion The effect of diffusivity

Active Publication Date: 2022-07-01
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the battery cut-off voltage is low and it is difficult to match the high-voltage positive stage caused by the high voltage window of the all-solid-state polymer electrolyte, and to provide a method for preparing a high-voltage-resistant solid-state battery composite positive electrode by in-situ block copolymerization

Method used

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  • A kind of high-voltage solid-state battery composite positive electrode and preparation method thereof
  • A kind of high-voltage solid-state battery composite positive electrode and preparation method thereof
  • A kind of high-voltage solid-state battery composite positive electrode and preparation method thereof

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specific Embodiment approach 1

[0026] Embodiment 1: This embodiment describes a composite positive electrode for a high-voltage solid-state battery, and the composite positive electrode includes lithium salt, LiNi 0.8 Co 0.1 Mn 0.1 O 2 , block copolymers and carbon nanotubes. Among them, LiNi 0.8 Co 0.1 Mn 0.1 O 2 As cathode active materials, block copolymers act as binders, and carbon nanotubes (CNTs) have high electrical conductivity. like figure 1 shown, which is a schematic diagram of the structure of the composite cathode, the block copolymer electrolyte replaces the traditional binder with conductive Li + The block monomer used contains -CN functional group, which can reduce the catalytic activity of the transition metal on the ternary surface, so the prepared positive stage has good high-pressure performance. Moreover, the method of in-situ polymerization is adopted, and the prepared composite positive grade has high density, and the assembled all-solid-state lithium battery has high volume...

specific Embodiment approach 2

[0027] Embodiment 2: According to Embodiment 1, a high-voltage-resistant solid-state battery composite positive electrode, the monomers of the block copolymer are ethyl cyanoacrylate (ECA), polyethylene oxide (PEO), polyethylene Alcohol (PVA), Polyvinylidene Fluoride (PVDF), Polyethylene Glycol, Polymethyl Methacrylate (PMMA), Polyethylene Glycol (Diol) Diacrylate (PEGDA), Polyvinyl Carbonate (PPC) any two of them.

specific Embodiment approach 3

[0028] Embodiment 3: According to Embodiment 1, a high-voltage-resistant solid-state battery composite positive electrode, the lithium salt is lithium perchlorate (LiClO 4 ), lithium hexafluorophosphate (LiPF 6 ), lithium bistrifluoromethanesulfonimide (LiTFSI), lithium hexafluoroarsenate (LiAsF 6 ), lithium tetrafluoroborate (LiBF 4 )one of a kind.

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Abstract

A composite positive electrode of a high-voltage solid-state battery and a preparation method thereof belong to the technical field of all-solid-state battery systems. The purpose of the present invention is to solve the problem of low cut-off voltage of the battery caused by the voltage window of the all-solid polymer electrolyte, and it is difficult to match the high voltage positive stage. In the bottle, add acetone solvent and stir to dissolve, stir for 12-24h, then add 1% azoisobutyronitrile based on the total mass of the polymer monomer as a thermal initiator, and continue stirring for 12-24h; the ternary LiNi 0.8 Co 0.1 Mn 0.1 O 2 The positive active material and carbon nanotubes are added into the container, then the block copolymer binder precursor solution in step 1 is added, and the mixture is stirred on a stirrer for 24-36 hours to make it evenly mixed; a pole piece is prepared. The present invention replaces the traditional lithium ion battery positive stage binder with a block copolymer electrolyte with good lithium ion conducting properties, so as to enhance the lithium ion diffusion capability inside the positive stage.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state battery systems, and in particular relates to a high-voltage-resistant solid-state battery composite positive electrode and a preparation method thereof. Background technique [0002] With the consumption of fossil energy and the shortage of resources, energy and environmental problems have become increasingly prominent. Secondary lithium-ion batteries have been used in various fields due to their high specific capacity, high voltage, wide temperature range, high coulombic efficiency, high cycle performance, and no memory effect aerospace defense, etc. Secondary lithium-ion batteries are considered to be one of the most promising electrochemical energy storage technologies. However, the current commercial lithium-ion batteries mostly use liquid organic electrolyte solutions, which have low boiling points and are toxic. In practical applications, electrolyte leakage may occur, and imprope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/62H01M4/1391H01M10/052
CPCH01M4/131H01M4/622H01M4/628H01M4/1391H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 王家钧安汉文娄帅锋孔凡鹏尹鸽平
Owner HARBIN INST OF TECH
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