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Aqueous zinc ion battery positive electrode material and matched electrolyte

A technology of zinc ion battery and positive electrode material, applied in battery electrodes, aqueous electrolytes, secondary batteries, etc., can solve the problems of increasing process complexity and cost, increasing active sites, difficult to scale preparation, etc., and achieving increased reaction activity site, enhance the effect of long cycle life, easy to scale preparation

Active Publication Date: 2021-06-01
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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  • Aqueous zinc ion battery positive electrode material and matched electrolyte
  • Aqueous zinc ion battery positive electrode material and matched electrolyte
  • Aqueous zinc ion battery positive electrode material and matched electrolyte

Examples

Experimental program
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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

The invention relates to an aqueous zinc ion battery positive electrode material and a matched electrolyte. A chemical formula of the positive electrode material is RxKyMn1-xO2-z, wherein x is greater than or equal to 0 and less than or equal to 0.1, y is greater than or equal to 0 and less than or equal to 0.5, z is greater than 0 and less than 0.1, and R is a metal cation. A preparation process comprises the following steps: grinding and uniformly mixing potassium permanganate, manganese acetate tetrahydrate and metal salt, then putting a mixture into a tubular furnace, carrying out heat treatment under a protective atmosphere, washing an obtained product with deionized water, carrying out suction filtration for several times, and then drying the product in a drying oven to obtain the RxKyMn1-xO2-z positive electrode material. According to the invention, K<+> is successfully pre-embedded into a tunnel structure of a manganese dioxide crystal through one-step heat treatment, metal cations are doped into the manganese dioxide crystal, and oxygen vacancies are introduced into the surface of the manganese dioxide crystal so that the structural stability of manganese dioxide is improved, active sites are increased, and the conductivity is improved. The material is low in production cost, simple in process, mild in reaction condition and easy for large-scale preparation. The positive electrode material has a high specific capacity, a high rate capability and excellent cycling stability; and the matched and compatible aqueous electrolyte further prolongs 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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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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