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Potassium manganese oxide for potassium ion battery positive electrode material and preparation method of potassium manganese oxide

A battery positive electrode and manganese oxide technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of high cost, high temperature, and unfavorable large-scale production, and achieve low cost, uniform chemical composition, and cycle capacity stable effect

Active Publication Date: 2017-08-25
NORTHEASTERN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The preparation method of high temperature pyrolysis requires high temperature and high cost, which is not conducive to the realization of large-scale production

Method used

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  • Potassium manganese oxide for potassium ion battery positive electrode material and preparation method of potassium manganese oxide
  • Potassium manganese oxide for potassium ion battery positive electrode material and preparation method of potassium manganese oxide
  • Potassium manganese oxide for potassium ion battery positive electrode material and preparation method of potassium manganese oxide

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preparation example Construction

[0035] First aspect, such as figure 1 Shown, the preparation method of potassium manganese oxide for the positive electrode material of potassium ion battery of an embodiment of the present invention, comprises the following steps:

[0036] Step S1: disperse manganese source and potassium source in deionized water, form the first solution after stirring;

[0037] Step S2: adding oxalic acid solution to the first solution and stirring to obtain a second solution; heating the second solution until the water is evaporated to obtain a precipitated material;

[0038] Step S3: pre-calcining the precipitated material after tableting, and cooling after pre-calcining to obtain a pre-calcined material;

[0039] Step S4: Grinding the pre-calcined material to obtain the ground material; pressing the ground material into tablets and calcining, and cooling to room temperature after calcining to obtain potassium manganese oxide for positive electrode materials of potassium ion batteries.

...

Embodiment 1

[0057] Mix and disperse potassium nitrate and manganese nitrate in deionized water at a molar ratio of 0.3:1, stir vigorously to form a transparent solution, then add 1mol / L oxalic acid solution to the transparent solution, and place it in a water bath at 80°C , evaporated to dryness, placed in an oven, and dried overnight to obtain a white precipitate material; the obtained white precipitate material was pressed into tablets and placed in an air atmosphere, and the temperature was raised to 450°C at a rate of 3°C / min, and kept at a constant temperature of 450°C Pre-calcined for 6 hours to obtain the pre-calcined material. The pre-calcined material was ground and re-pressed into tablets, and calcined at a constant temperature of 900°C for 15 hours, and then naturally cooled to room temperature with the furnace.

[0058] The nominal composition of the resulting product is K 0.3 MnO 2 , X-ray diffraction analysis was performed on the prepared cathode material. according to ...

Embodiment 2

[0066] Mix and disperse potassium acetate and manganese acetate in deionized water at a molar ratio of 0.7:1, stir vigorously to form a transparent solution, then add 1mol / L oxalic acid solution to the transparent solution, and place it in a 90°C water bath , after evaporating the water, put it in an oven and dry it overnight to obtain a white precipitated material; press the obtained white precipitated material into tablets, place it in an air atmosphere, raise the temperature to 350°C at a rate of 2°C / min, and keep the constant temperature at 350°C Pre-calcined for 6 hours to obtain the pre-calcined material. The pre-calcined material was ground and re-pressed into tablets, calcined at a constant temperature of 750°C for 15 hours, and then cooled to room temperature in liquid nitrogen. The nominal composition of the resulting product is K 0.7 MnO 2 .

[0067] A potassium ion battery was prepared according to the method in Example 1 and a charge and discharge test was perf...

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Abstract

The invention relates to a method for preparing a potassium manganese oxide for a potassium ion battery positive electrode material. The method comprises the following steps: S1, dispersing a manganese source and a potassium source in deionized water, and stirring to form a first solution; S2, adding an oxalic acid solution into the first solution, stirring to obtain a second solution, heating the second solution until the moisture is evaporated to dryness so as to obtain a precipitated material; S3, tabletting the precipitated material, pre-calcining, and cooling after pre-calcining so as to obtain a pre-calcined material; and S4, grinding the pre-calcined material so as to obtain a ground material; tabletting and calcining the ground material, cooling to room temperature after calcining, thereby obtaining the potassium manganese oxide for the potassium ion battery positive electrode material. The method for preparing the potassium manganese oxide for the potassium ion battery positive electrode material provided by the invention is simple in process, low in cost and convenient for realization of large-scale production.

Description

technical field [0001] The invention relates to the technical field of potassium ion batteries, in particular to the technical field of potassium manganese oxide used as an electrode material for potassium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in various portable electronic products, pure electric vehicles and hybrid vehicles due to their advantages such as high energy density, high working voltage, long cycle life and low self-discharge rate. However, the biggest problem with lithium-ion batteries at present is the high production cost of lithium and the shortage of resources, which make it difficult to meet the needs of long-term development in the future. Potassium-ion batteries work in a similar way to lithium-ion batteries. Compared with lithium resources in lithium-ion batteries, potassium resources have the natural advantages of being widely distributed (the abundance in the earth's c...

Claims

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Application Information

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IPC IPC(8): H01M4/50H01M10/054
CPCH01M4/50H01M10/054H01M2004/028Y02E60/10
Inventor 罗绍华刘彩玲黄红波王庆王志远李俊哲张俊包硕翟玉春王兆文
Owner NORTHEASTERN UNIV
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