Water-based zinc-based secondary battery with high energy density and long cycle life

A zinc-based secondary battery, high energy density technology, applied in secondary batteries, battery electrodes, aqueous electrolytes, etc., can solve the problem of poor cycle life of aqueous secondary zinc-based batteries, narrow electrochemical window of electrolyte, and limited battery energy Density and other issues, to achieve high thermodynamic stability, ease the formation of zinc negative electrode dendrites and hydrogen evolution reaction, and improve the effect of negative electrode Coulombic efficiency

Active Publication Date: 2022-05-27
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the currently developed water-based zinc-based secondary battery system, there are obvious dissolution phenomena in positive electrode materials such as manganese-based oxides and vanadium-based oxides, and dendrite growth, hydrogen evolution, and passivation of the metal zinc negative electrode also cause coulombic efficiency. Low problem, resulting in poor cycle life of aqueous secondary zinc-based batteries
In addition, the narrow electrochemical window of the electrolyte of the existing aqueous zinc-based secondary battery also limits the energy density of the battery.

Method used

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  • Water-based zinc-based secondary battery with high energy density and long cycle life
  • Water-based zinc-based secondary battery with high energy density and long cycle life
  • Water-based zinc-based secondary battery with high energy density and long cycle life

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Effect test

Embodiment 1

[0044] (1) The layered structure V 2 O 5 ·nH 2 O positive electrode active material, conductive agent acetylene black and binder polytetrafluoroethylene (PTFE) were mixed in a mass ratio of 70:20:10 and dispersed in N-methylpyrrolidone (NMP) to prepare a slurry, and the slurry was rolled out. Pressed into a self-supporting film, dried and cut into a positive electrode sheet;

[0045] (2) dissolving zinc chloride and choline chloride in deionized water, and configuring it into an electrolyte having a molar concentration of 45 m according to a molar concentration (m) ratio of 2:1;

[0046] (3) Cut a metal zinc foil with a thickness of 10 μm and a purity of 99% into a suitable size matching the positive electrode to make a negative electrode sheet;

[0047] (4) Separating the above-prepared positive electrode sheet and negative electrode sheet with a glass fiber membrane separator, putting it into a battery case, and then injecting an electrolyte solution to encapsulate the ba...

Embodiment 2

[0049] (1) The layered structure K 0.25 V 2 O 5 ·nH 2 O positive active material, conductive agent Ketjen black and binder vinylidene fluoride (PVDF) are mixed in a mass ratio of 70:10:10 and dispersed in NMP to prepare a slurry, which will be coated on the carbon paper current collector, After drying, it is cut into a positive electrode sheet;

[0050] (2) zinc chloride and choline chloride are dissolved in deionized water, according to mass molar concentration ratio 2:1, be configured into the electrolyte that mass molar concentration is 60m;

[0051] (3) Cut a metal zinc foil with a thickness of 20 μm and a purity of 99.9% into a suitable size matching the positive electrode to make a negative electrode sheet;

[0052] (4) The above-prepared positive electrode sheet and negative electrode sheet are separated by a non-woven diaphragm, put into a battery case, and then injected with an electrolyte solution to encapsulate the battery to obtain an aqueous zinc-based seconda...

Embodiment 3

[0054] The layered structure Co 0.20 V 2 O 5 ·nH 2 O positive active material, conductive agent Ketjen black and binder PVDF are mixed in a mass ratio of 80:10:10 and dispersed in NMP to prepare a slurry, which will be coated on the carbon paper current collector, dried and cut to make positive plate;

[0055] (2) zinc chloride and choline chloride are dissolved in deionized water, according to mass molar concentration ratio 2:1, be configured into the electrolyte that mass molar concentration is 90m;

[0056] (3) Cut a metal zinc foil with a thickness of 20 μm and a purity of 99.99% into a suitable size matching the positive electrode to make a negative electrode sheet;

[0057] (4) Separating the above-prepared positive electrode sheet and negative electrode sheet with a glass fiber membrane separator, putting it into a battery case, and then injecting an electrolyte solution to encapsulate the battery to obtain an aqueous zinc-based secondary battery.

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Abstract

The invention discloses a water-based zinc-based secondary battery with high energy density and long cycle life, which is characterized in that a positive active material of the battery is one of vanadium pentoxide or cation defect type vanadium-based oxide with a layered structure, and a negative electrode of the battery is metal zinc foil; the electrolyte is a high-concentration aqueous solution formed by two chlorides of zinc chloride and choline chloride, and the positive plate and the electrolyte are respectively prepared, and the aqueous zinc-based secondary battery is formed after the battery is packaged. The novel high-concentration electrolyte adopted by the water-based zinc-based secondary battery provided by the invention not only has high thermodynamic stability and a wide electrochemical window, but also can simultaneously realize the improvement of the cycling stability of the positive electrode material and the zinc ion deposition / stripping coulombic efficiency of the negative electrode; the constructed novel aqueous zinc-based secondary battery has the characteristics of high capacity and energy density and long cycle life, and has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of energy storage and batteries, and relates to an aqueous zinc-based secondary battery with high energy density and long cycle life. Background technique [0002] In recent years, climate change caused by carbon dioxide emissions has seriously threatened human survival and development. Countries around the world have adopted a global agreement to reduce greenhouse gas emissions to deal with climate change. Developing low-carbon energy, optimizing the energy structure, and realizing a low-carbon economy have become a realistic choice for human development. In order to promote the energy revolution and clean and low-carbon development, wind energy, solar energy and other renewable energy sources are the dominant energy sources, and the development of economical renewable energy storage technology has become a global trend. [0003] Battery energy storage technology realizes energy storage and utilization thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/38H01M10/36H01M10/38
CPCH01M4/48H01M4/38H01M10/36H01M10/38H01M2300/0002Y02P70/50Y02E60/10
Inventor 张璐王文凤赵佳晋段泽昂李如月齐亚迪韩树民
Owner YANSHAN UNIV
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