A kind of composite bimetallic boride alkaline aqueous electrolyte system battery cathode material and preparation method thereof

A composite bimetallic and alkaline aqueous solution technology, which is applied in the direction of metal borides, battery electrodes, boron/borides, etc., can solve the problems of weak high-current charge and discharge capabilities, low utilization of active materials, and poor cycle performance of nickel electrodes. , to achieve the effect of increasing electronic conductivity, good initial charge and discharge performance and cycle performance, and excellent charge and discharge performance

Active Publication Date: 2022-07-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low utilization rate of active materials and poor conductivity of current nickel-based cathode materials, the cycle performance of nickel electrodes is poor and the high-current charge-discharge capability is weak.

Method used

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  • A kind of composite bimetallic boride alkaline aqueous electrolyte system battery cathode material and preparation method thereof
  • A kind of composite bimetallic boride alkaline aqueous electrolyte system battery cathode material and preparation method thereof
  • A kind of composite bimetallic boride alkaline aqueous electrolyte system battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) 0.0025 mol of cobalt chloride, 0.0025 mol of nickel chloride and 5.0 g of polyethylene glycol were dissolved in 100 ml of deionized water, 20 ml of cyclohexane was added to this solution, and the mixture thus obtained was subjected to ultrasound at 293K Treated for 30 minutes to form a uniformly dispersed microemulsion. Then, 0.001 mol of sodium hydroxide was dissolved in 10 ml of deionized water (to form an alkaline solution with a pH value of about 13), and 0.02 mol of sodium borohydride was added to form a sodium borohydride solution. The sodium borohydride solution was added dropwise to the water-in-oil microemulsion under vigorous stirring, and when the bubbles stopped, the black precipitate in the solution was filtered and thoroughly washed with deionized water and ethanol. The washed powder is then dried in a nitrogen atmosphere to finally obtain a composite bimetallic boride.

[0038] The test results of the full-spectrum direct reading plasma emission spec...

Embodiment 2

[0045] 0.0015mol of cobalt chloride, 0.0035mol of nickel chloride and 5.0g of polyethylene glycol (M w = 20,000) was dissolved in 100 ml of deionized water, 20 ml of cyclohexane was added to this solution, and the mixture thus obtained was sonicated at room temperature for 40 minutes to form a water-in-oil microemulsion. Then 0.02mol of sodium borohydride was dissolved in 10ml of 0.1M sodium hydroxide solution (pH value was about 13) to prepare a sodium borohydride solution. The sodium borohydride solution was added dropwise to the oil-in-water microemulsion under vigorous stirring, and when the bubbles stopped, the black precipitate in the solution was filtered and thoroughly washed with deionized water and ethanol. Then, the washed powder is dried under vacuum to finally obtain a composite bimetallic boride;

[0046] The prepared product, acetylene black and polytetrafluoroethylene (PTFE) aqueous solution were mixed in a mass ratio of 8:1:1 to prepare a working electrode sl...

Embodiment 3

[0049] 0.0035mol of cobalt chloride, 0.0015mol of nickel chloride and 5.0g of polyethylene glycol (M w = 20,000) was dissolved in 100 ml of deionized water, 20 ml of cyclohexane was added to this solution, and the mixture thus obtained was sonicated at room temperature for 40 minutes to form a water-in-oil microemulsion. Then, 0.02 mol of sodium borohydride was dissolved in 10 ml of sodium hydroxide solution with a concentration of 0.1 M (pH value was about 13) to prepare a sodium borohydride solution. The sodium borohydride solution was added dropwise to the oil-in-water microemulsion under vigorous stirring, and when the bubbles stopped, the black precipitate in the solution was filtered and thoroughly washed with deionized water and ethanol. Then, the washed powder is dried under vacuum to finally obtain a composite bimetallic boride;

[0050] The prepared product, acetylene black and polytetrafluoroethylene (PTFE) aqueous solution were mixed in a mass ratio of 8:1:1 to pr...

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Abstract

The invention belongs to the field of batteries, and in particular relates to an alkaline aqueous electrolyte system battery cathode material of a composite bimetallic boride and a preparation method thereof. The material is amorphous nano-spherical particles, wherein nickel-cobalt element and boron element form double metal boride Co-Ni-B. The above-mentioned composite bimetallic boride alkaline aqueous electrolyte system battery positive electrode material can be used as an alkaline aqueous electrolyte system battery positive electrode. It is divided into electrodes, which are then used as positive electrodes. It has excellent charge-discharge performance, cycle performance and rate performance.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a composite bimetallic boride alkaline aqueous electrolyte system battery positive electrode material and a preparation method thereof. Background technique [0002] The alkaline aqueous electrolyte system battery has the advantages of high conductivity, high power density, wide material sources, low cost, safety and environmental protection. Although aqueous electrolytes have narrow electrochemical windows, high-energy-density electrochemical energy storage and conversion devices can be constructed through the application of high-capacity electrode materials. Therefore, electrode materials with high rate performance and high specific capacity are important for developing aqueous electrolytes. The key to the application of the system battery system. [0003] The alkaline aqueous electrolyte system battery is mainly composed of positive and negative active materials and elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/04H01M4/58H01M10/38B82Y30/00B82Y40/00
CPCY02P70/50
Inventor 王雅东程旭张健刘毅腾曽招维
Owner WUHAN UNIV OF TECH
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