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High-voltage-resistant solid-state battery composite positive electrode and preparation method thereof

A composite positive electrode and solid-state battery technology, applied in battery electrodes, positive electrodes, lithium batteries, etc., can solve the problems of low battery cut-off voltage and difficulty in matching high-voltage positive stages, and achieve increased volumetric energy density, low impedance, and long cycle life Effect

Active Publication Date: 2021-09-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • High-voltage-resistant solid-state battery composite positive electrode and preparation method thereof

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specific Embodiment approach 1

[0026] Specific embodiment 1: This embodiment describes a high-voltage solid-state battery composite positive electrode, 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 positive active materials, block copolymers serve as binders, and carbon nanotubes (CNTs) are highly conductive. like figure 1 As shown, this is a schematic diagram of the structure of the composite positive electrode. The block copolymer electrolyte replaces the traditional binder and has the ability to conduct 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-voltage performance. Moreover, the in-situ polymerization method is adopted, and the composite positive stage prepared has a high density, and the all-solid-state lithium battery assembled...

specific Embodiment approach 2

[0027] Specific embodiment two: a kind of high-voltage resistant solid-state battery composite positive electrode described in specific embodiment one, the monomer of the block copolymer is ethyl cyanoacrylate (ECA), polyethylene oxide (PEO), polyethylene Alcohol (PVA), Polyvinylidene Fluoride (PVDF), Polyethylene Glycol, Polymethyl Methacrylate (PMMA), Polyethylene Glycol (Glycol) Diacrylate (PEGDA), Polyethylene Carbonate (PPC) Any two of them.

specific Embodiment approach 3

[0028] Specific embodiment three: a kind of high-voltage resistant solid-state battery composite positive electrode described in specific embodiment one, the lithium salt is lithium perchlorate (LiClO 4 ), lithium hexafluorophosphate (LiPF 6 ), lithium bistrifluoromethanesulfonylimide (LiTFSI), lithium hexafluoroarsenate (LiAsF 6 ), lithium tetrafluoroborate (LiBF 4 )one of a kind.

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Abstract

The invention discloses a high-voltage-resistant solid-state battery composite positive electrode and a preparation method thereof, and belongs to the technical field of all-solid-state battery systems. In order to solve the problems of low cut-off voltage of a battery and difficulty in matching with a high-voltage positive electrode caused by a voltage window of an all-solid-state polymer electrolyte, the method comprises the following steps: weighing two polymer monomers and lithium salt, adding into a reagent bottle, adding an acetone solvent, stirring for dissolving, stirring for 12-24 hours, and filtering to obtain a filtrate; adding azoisobutyronitrile which accounts for 1% of the total mass of the polymer monomer as a thermal initiator, and continuously stirring for 12-24 hours; adding a ternary LiNi0. 8Co0. 1Mn0. 1O2 positive active material and a carbon nanotube into a container, then adding the segmented copolymer binder precursor solution obtained in the step 1, and stirring on a stirrer for 24-36 hours to uniformly mix; and preparing the pole piece. According to the invention, the traditional lithium ion battery positive electrode binder is replaced by the segmented copolymer electrolyte with good lithium ion conductivity, so that the lithium ion diffusivity in the positive electrode is enhanced.

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, issues such as energy and environment have become increasingly prominent. Due to its advantages of high specific capacity, high voltage, wide temperature range, high coulombic efficiency, high cycle performance and no memory effect, secondary lithium-ion batteries have been used in various fields, including battery cars, portable electronic devices, aerospace defense, etc. Secondary lithium-ion batteries are considered to be one of the most promising electrochemical energy storage technologies. However, currently commercialized lithium-ion batteries mostly use liquid organic electrolyte solutions. Organic electrolyte solutions have low boi...

Claims

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Application Information

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Patent Type & Authority Applications(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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