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Nickel- and bismuth-modified MnO2 positive electrode material and preparation method and application thereof

A manganese dioxide, cathode material technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of poor rate performance, short cycle life, hindering development, etc., and achieve good rate performance and long cycle performance. Effect

Active Publication Date: 2019-05-21
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the research on manganese-based electrode materials mainly focuses on tetravalent manganese-based materials. However, its poor conductivity and large volume change during charge and discharge lead to poor rate performance and short cycle life, which hinders its further development.

Method used

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  • Nickel- and bismuth-modified MnO2 positive electrode material and preparation method and application thereof
  • Nickel- and bismuth-modified MnO2 positive electrode material and preparation method and application thereof
  • Nickel- and bismuth-modified MnO2 positive electrode material and preparation method and application thereof

Examples

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Embodiment 1

[0026] A kind of nickel, bismuth modified manganese dioxide cathode material, described material is prepared by following method: the hydrochloric acid (concentration is 36%) of 7mmol potassium permanganate and 2.5ml is stirred in 70ml deionized water , then add 0.035mmol of nickel nitrate and 0.035mmol of bismuth nitrate, and stir vigorously for 30 minutes at a speed of 1000 rpm, then pour the solution into a 100ml polytetrafluoroethylene autoclave, and heat it under 160°C After reacting for 10 hours, after cooling down to room temperature, the reaction solution was washed until the solution was neutral, then filtered, dried at 80°C for 12 hours, and ground for 45 minutes to obtain nickel and bismuth modified manganese dioxide powder positive electrode materials. The atomic ratio of the manganese element to the nickel element and the bismuth element in the positive electrode material prepared in the embodiment is 1:0.005:0.005, which is marked as "MnO 2 :Ni,Bi=1:0.005".

Embodiment 2

[0028] A kind of nickel, bismuth modified manganese dioxide cathode material, described material is prepared by following method: the hydrochloric acid (concentration is 36%) of 7mmol potassium permanganate and 2.5ml is stirred in 70ml deionized water , then add 0.7mmol of nickel nitrate and 0.7mmol of bismuth nitrate, and stir vigorously for 30 minutes at a speed of 1000 rpm, then pour the solution into a 100ml polytetrafluoroethylene autoclave, and heat it under 160°C After reacting for 10 hours, after cooling down to room temperature, the reaction solution was washed until the solution was neutral, then filtered, dried at 80°C for 12 hours, and ground for 45 minutes to obtain nickel and bismuth modified manganese dioxide powder positive electrode materials. The atomic ratio of manganese element, nickel element and bismuth element in the positive electrode material prepared in the example is 1:0.1:0.1, marked as "MnO 2 :Ni,Bi=1:0.1".

Embodiment 3

[0030] A kind of nickel, bismuth modified manganese dioxide cathode material, described material is prepared by following method: the hydrochloric acid (concentration is 36%) of 7mmol potassium permanganate and 2.5ml is stirred in 70ml deionized water , then add 2.45mmol of nickel nitrate and 2.45mmol of bismuth nitrate, stir vigorously for 30 minutes at a speed of 1000 rpm, pour the solution into a 100ml polytetrafluoroethylene autoclave, and heat it under 160°C After reacting for 10 hours, after cooling down to room temperature, the reaction solution was washed until the solution was neutral, then filtered, dried at 80°C for 12 hours, and ground for 45 minutes to obtain nickel and bismuth modified manganese dioxide powder positive electrode materials. The atomic ratio of manganese element to nickel element and bismuth element in the positive electrode material prepared in the example is 1:0.35:0.35, marked as "MnO 2 :Ni,Bi=1:0.35".

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Abstract

The invention creates and provides a nickel- and bismuth-modified MnO2 positive electrode material and preparation method and application thereof. The material is prepared by the following method of uniformly stirring potassium permanganate and hydrochloric acid in deionized water, adding a certain amount of nickel nitrate and bismuth nitrate, performing hydrothermal reaction, and finally, obtaining the nickel- and bismuth-modified MnO2 powder positive electrode material, wherein the nickel- and bismuth-modified MnO2 positive electrode material is applicable to a zinc ion battery. The nickel-and bismuth-modified MnO2 positive electrode material and the zinc ion battery with the electrode material, created by the invention, have relatively good rate performance, cycle property and relatively long cycle lifetime.

Description

technical field [0001] The invention belongs to the field of zinc ion battery materials, and in particular relates to a nickel and bismuth modified manganese dioxide positive electrode material and its preparation method and application. Background technique [0002] Zinc-ion battery is a safe and non-polluting secondary battery with zinc powder or zinc sheet as the negative electrode material and manganese base as the positive electrode material. Manganese dioxide has the advantages of low price and environmental friendliness. At the same time, it has outstanding ion storage performance due to the variable valence state of manganese. Recently, it has outstanding performance as an electrode material in chemical batteries such as new zinc-ion batteries. [0003] At present, the research on manganese-based electrode materials mainly focuses on tetravalent manganese-based materials. However, its poor conductivity and large volume change during charging and discharging lead to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M10/054
CPCY02E60/10
Inventor 刘强朱文静
Owner TIANJIN UNIVERSITY OF TECHNOLOGY