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A kind of water-based zinc-ion battery cathode material and matching electrolyte

A technology of zinc ion battery and cathode material, applied in battery electrodes, aqueous electrolytes, secondary batteries, etc., can solve the problems of increasing process complexity and cost, difficulty in large-scale preparation, increasing active sites, etc., so as to increase reaction activity site, easy to scale up, enhanced effect of long cycle life

Active Publication Date: 2022-05-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three prominent problems in the development and utilization of traditional fossil energy such as coal, oil, and natural gas: resource depletion, climate warming, and environmental pollution
At present, the positive electrode materials of aqueous zinc-ion batteries are mainly manganese oxides and vanadium oxides. Among them, manganese oxides have the most application prospects due to their advantages such as low cost, environmental protection, and high energy density, while manganese dioxide in manganese oxides is the most promising. It is considered to be the most valuable cathode material, but there are still problems of low specific capacity, poor rate performance, and short cycle life, which are closely related to the structural stability of the material and the compatibility of the electrolyte
Introducing K + Into the tunnel structure of manganese dioxide can enhance the stability of the structure, but K + It usually needs to be realized under the conditions of high temperature and high pressure hydrothermal reaction, which is difficult to prepare on a large scale; secondly, how to maintain K + Not getting out of the tunnel is also an urgent problem to be solved
In addition, the introduction of oxygen vacancies and metal cation doping into manganese dioxide can increase active sites and improve conductivity, improve specific capacity, rate performance and cycle stability; while existing studies mostly use high-temperature secondary heat treatment or hydrothermal The reaction introduces surface oxygen vacancies, which increases process complexity and cost

Method used

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  • A kind of water-based zinc-ion battery cathode material and matching electrolyte
  • A kind of water-based zinc-ion battery cathode material and matching electrolyte
  • A kind of water-based zinc-ion battery cathode material and matching electrolyte

Examples

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Effect test

Embodiment 1

[0036] Weigh potassium permanganate and manganese acetate tetrahydrate, grind and mix evenly at a molar ratio of 1:1, transfer the ground mixture to a crucible; place the crucible in a tube furnace and heat up at 5°C / min Heat at a rate of 150°C and keep it warm for 4 hours, then heat it up to 400°C at a heating rate of 5°C / min, keep it warm for 1 hour, wait until the tube furnace cools down to room temperature, and collect the product; the obtained product is washed with deionized water, filtered with suction times, and then dried in an oven at 80°C to obtain K 0.1 MnO 2-yCathode material.

Embodiment 2

[0038] Weigh potassium permanganate and manganese acetate tetrahydrate, grind and mix evenly at a molar ratio of 1:1.5, transfer the ground mixture to a crucible; place the crucible in a tube furnace and heat up at 5°C / min under an argon atmosphere Heat at a rate of 180°C and keep it warm for 4h, then heat it up to 500°C at a rate of 5°C / min and keep it warm for 2h, wait until the tube furnace cools down to room temperature, collect the product; wash the obtained product with deionized water, filter with suction times, and then dried in an oven at 80°C to obtain K 0.12 MnO 2-y Cathode material. K 0.12 MnO 2-y The schematic diagram of the crystal structure of the cathode material is shown in figure 1 , K + Located in the tunnel structure of manganese dioxide; SEM see figure 2 , the cathode material presents a nanorod-like morphology; the XRD pattern is shown in image 3 , compared with pristine manganese dioxide, the low-angle diffraction peak of the cathode material is...

Embodiment 3

[0041] Weigh potassium permanganate and manganese acetate tetrahydrate, grind and mix evenly at a molar ratio of 1:1.5, transfer the ground mixture to a crucible; place the crucible in a tube furnace and heat up at 5°C / min under an argon atmosphere Heat at a rate of 180°C and keep it warm for 4h, then heat it up to 600°C at a rate of 5°C / min and keep it warm for 2h, wait until the tube furnace cools down to room temperature, and collect the product; the obtained product is washed with deionized water, filtered with suction times, and then dried in an oven at 80°C to obtain K 0.12 MnO 2-y Cathode material.

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Abstract

A water-based zinc-ion battery cathode material and a matching electrolyte. The chemical formula of the positive electrode material is R x K y mn 1‑x o 2‑z , where 0≤x≤0.1, 0≤y≤0.5, 0<z<0.1, R is a metal cation, and the preparation process includes: grinding and mixing potassium permanganate, manganese acetate tetrahydrate and metal salts and placing them in a tubular Heat treatment in a furnace under a protective atmosphere, the resulting product is washed with deionized water, filtered several times, and then dried in an oven to obtain R x K y mn 1‑x o 2‑z Cathode material. The present invention converts K through one-step heat treatment + Successfully pre-embedded in the tunnel structure of manganese dioxide crystals, and doped metal cations into manganese dioxide crystals, while introducing oxygen vacancies on the surface, improving the structural stability of manganese dioxide, increasing active sites and improving conductivity. The invention has low production cost, simple process, mild reaction conditions and easy large-scale preparation. The positive electrode material has high specific capacity, high rate performance and excellent cycle stability; the matching and compatible aqueous electrolyte further improves the long cycle life of the positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of water-based zinc-ion batteries, and in particular relates to a water-based zinc-ion battery cathode material and a matching electrolyte. Background technique [0002] With the continuous development of the economy and the continuous progress of science and technology, the demand for energy is gradually increasing. There are three prominent problems in the development and utilization of traditional fossil energy such as coal, oil, and natural gas: resource depletion, climate warming, and environmental pollution. The development of renewable energy such as solar energy, wind energy and tidal energy is an inevitable trend to solve the outstanding problems faced by non-renewable energy and ensure the sustainable development of human beings. Among the current energy storage devices, lithium-ion batteries are not suitable for the development of large-scale grid energy storage due to rising costs and prominent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/485H01M10/36C01G45/12
CPCH01M4/505H01M4/485H01M10/36C01G45/12C01P2002/72C01P2004/03H01M2300/0011Y02E60/10
Inventor 李平韩坤闫凤生曲选辉
Owner UNIV OF SCI & TECH BEIJING
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