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Alkaline secondary battery and preparation method thereof

A secondary battery, alkaline technology, applied in the direction of alkaline storage battery, alkaline storage battery electrode, battery electrode, etc., can solve the problem that the discharge specific capacity of the secondary battery is easy to drop, and improve the electrochemical reversibility and increase the rate performance , Increase the effect of electronic conductivity

Active Publication Date: 2021-08-27
WUHAN UNIV 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 overcome the above-mentioned technical deficiencies, provide an alkaline secondary battery and its preparation method, and solve the technical problem that the discharge specific capacity of the secondary battery is easily reduced in the low temperature environment in the prior art

Method used

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  • Alkaline secondary battery and preparation method thereof
  • Alkaline secondary battery and preparation method thereof
  • Alkaline secondary battery and preparation method thereof

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preparation example Construction

[0036] This specific embodiment also proposes a preparation method of the above-mentioned alkaline secondary battery, comprising the following steps:

[0037] Assemble according to the order of positive electrode casing, steel mesh, positive electrode, separator, negative electrode, steel mesh, and negative electrode casing, and add alkaline aqueous electrolyte to obtain the alkaline secondary battery; the separator is glass fiber diaphragm, nylon fiber diaphragm, polypropylene fiber Diaphragm, Velen fiber membrane or filter paper;

[0038] Wherein, the boride in the negative electrode is made by the following steps:

[0039] dissolving the metal salt in water, cooling in an ice-water bath to obtain a metal salt solution, then dissolving borohydride in an alkaline aqueous solution with a pH value of 10-14, and then adding it dropwise to the metal salt solution to obtain the boron compound, and the boride is placed in a vacuum oven and dried at 50-120°C for 1-24h; the metal sa...

Embodiment 1

[0046] Prepare the active material cobalt boride in the negative electrode:

[0047] Dissolve sodium borohydride in aqueous sodium hydroxide solution with a pH value of 12 to prepare 250 mL of 0.5 mol L -1 The sodium borohydride solution, the purpose of adding sodium hydroxide is to prevent the violent hydrolysis of sodium borohydride;

[0048] Prepare divalent cobalt chloride solution (0.1mol L -1 ,250mL), then cooled in an ice bath, and with stirring, the sodium borohydride solution was added dropwise to the CoCl 2 Carry out chemical reduction reaction in the solution to obtain cobalt boride precipitate; after the addition is completed, continue to stir for about 1 hour to release hydrogen.

[0049] The cobalt boride precipitate was first washed with distilled water to remove the reaction residue, and then washed with ethanol to prevent further oxidation of the sample surface. Finally, the sample was dried in a vacuum at 80°C for 14 hours to remove residual water and etha...

Embodiment 2

[0054] Prepare the active material cobalt boride in the negative electrode:

[0055] Dissolve potassium borohydride in aqueous potassium hydroxide solution with a pH value of 14 to prepare 250 mL of 0.5 mol L -1 Potassium borohydride solution, the purpose of adding potassium hydroxide is to prevent the violent hydrolysis of potassium borohydride;

[0056] Prepare divalent cobalt chloride solution (0.1mol L -1 , 250mL), then cooled in an ice bath, and under stirring conditions, the potassium borohydride solution was added dropwise to the cobalt sulfate solution to carry out chemical reduction reaction to obtain cobalt boride precipitation; after the addition was completed, continue stirring for about 1h, release hydrogen.

[0057] The cobalt boride precipitate was first washed with distilled water to remove the reaction residue, and then washed with ethanol to prevent further oxidation of the sample surface. Finally, the sample was dried in a vacuum at 50°C for 24 hours to r...

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Abstract

The invention discloses an alkaline secondary battery and a preparation method thereof, and belongs to the technical field of alkaline secondary batteries. The alkaline secondary battery comprises a diaphragm, an alkaline aqueous solution electrolyte, a positive electrode and a negative electrode, an active matter of the positive electrode is a Co-Ni-B compound, and an active matter of the negative electrode is a boride. The invention also comprises a preparation method of the alkaline secondary battery, which comprises the following steps: assembling the positive electrode, the diaphragm and the negative electrode in sequence, and adding the alkaline aqueous solution electrolyte to obtain the alkaline secondary battery, wherein the boride in the negative electrode is prepared by the following steps: dissolving hydroboron in an alkaline aqueous solution with the pH value of 10-14, and then dropwise adding the alkaline aqueous solution into a metal salt solution to obtain the boride. The alkaline secondary battery still has outstanding electrochemical performance at low temperature.

Description

technical field [0001] The invention relates to the technical field of alkaline secondary batteries, in particular to an alkaline secondary battery and a preparation method thereof. Background technique [0002] Renewable energy will play an active role in future energy diversification due to its environmental friendliness. Electrochemical energy storage devices are the key to solving the storage and utilization of clean energy such as wind power, solar power, and hydropower. Rechargeable battery technology is an important part of electrochemical energy storage systems. Lithium-ion batteries (LIBS), lead-acid batteries (VRLA), sodium-sulfur batteries (Na-S), redox flow batteries (VRFBs), and nickel-metal hydride batteries (Ni-MH) are widely used in portable devices, electric vehicles, and power grids Energy storage, but due to the limitations of existing battery materials, its key index parameters still cannot meet practical applications. Especially in terms of cost, ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/24H01M4/26H01M4/58H01M10/26
CPCH01M4/58H01M4/26H01M10/24H01M10/26Y02E60/10
Inventor 王雅东易磊廖玉聪唐雅芸李想李晗阳吕宁徐悦欣
Owner WUHAN UNIV OF TECH
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