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Preparation method of petal-sheet-shaped spherical birnessite potassium ion battery positive electrode material

A battery cathode, birnessite technology, applied in the field of high-efficiency energy storage new energy material preparation, can solve the problems of limited performance, high risk, large product size, etc.

Inactive Publication Date: 2021-04-23
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, potassium-ion batteries are still in the research and experimental stage of slow charging and discharging with small currents, and there are still many problems before commercial development (Structural Insight into Layer Gliding and Lattice Distortion in Layered Manganese Oxide Electrodes for Potassium-Ion Batteries. Adv. Energy Mater .2019, 1900568)
At present, the preparation of most cathode materials for potassium-ion batteries relies on high-temperature calcination, which is not only cumbersome and has high risks, but also has a large size, which is not conducive to rapid charge and discharge, thus limiting the improvement of performance.

Method used

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  • Preparation method of petal-sheet-shaped spherical birnessite potassium ion battery positive electrode material
  • Preparation method of petal-sheet-shaped spherical birnessite potassium ion battery positive electrode material
  • Preparation method of petal-sheet-shaped spherical birnessite potassium ion battery positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Add 2g of manganese nitrate tetrahydrate into 100ml of ethylene glycol solution, add potassium hydroxide to the above system at a molar ratio of potassium hydroxide to manganese nitrate of 0.1:1, and then add 0.1g of PVP. The temperature of the mixed solution was raised to 90°C, and kept under constant stirring for 2h. After the reaction system was cooled to room temperature, the sample was centrifugally washed with deionized water until neutral, and finally dried in an oven at 70°C for 12 hours to obtain a birnessite sample.

[0027] The XRD pattern of the petal-shaped spherical birnessite sample prepared in embodiment 1 is shown in figure 1 , is composed of sodium manganese mineral phase. It has a petal-shaped spherical shape, the thickness of the petal-shaped nano-sheet is 1-3nm, and the diameter of the sphere is 50-100nm.

Embodiment 2

[0029] Add 2g of manganese nitrate tetrahydrate into 100ml of ethylene glycol solution, add potassium hydroxide to the above system according to the molar ratio of potassium hydroxide to manganese nitrate of 0.5:1, and then add 0.1g of PVP. The temperature of the mixed solution was raised to 90°C, and kept under constant stirring for 2h. After the reaction system was cooled to room temperature, the sample was centrifugally washed with deionized water until neutral, and finally dried in an oven at 70°C for 12 hours to obtain a birnessite sample.

[0030] The prepared petal flake-shaped spherical birnessite sample has the same XRD analysis results as in Example 1. SEM characterization shows that the thickness of the nanosheet is 1-3 nm, and the diameter of the sphere is 100-150 nm.

Embodiment 3

[0032] Add 2g of manganese nitrate tetrahydrate into 100ml of ethylene glycol solution, add potassium hydroxide to the above system according to the molar ratio of potassium hydroxide and manganese nitrate as 1:1, and then add 0.1g of PVP. The temperature of the mixed solution was raised to 90°C, and kept under constant stirring for 2h. After the reaction system was cooled to room temperature, the sample was centrifugally washed with deionized water until neutral, and finally dried in an oven at 70°C for 12 hours to obtain a birnessite sample.

[0033] The prepared petal flake-shaped spherical birnessite sample has the same XRD analysis results as in Example 1. SEM characterization shows that the thickness of the nanosheets is 1-3 nm, and the diameter of the sphere is 150-200 nm.

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Abstract

The invention aims to prepare a nanoscale potassium ion battery positive electrode material by utilizing a normal-pressure solvothermal synthesis method. By controlling the K / Mn molar ratio of reactants and the molar ratio of metal salt to manganese salt, an organic compound template agent and a hydrogen peroxide solution are added, and the potassium type birnessite phase potassium ion battery positive electrode material capable of accurately controlling the potassium content and the crystal phase structure is synthesized and prepared by a coprecipitation and solvothermal method. The material has petal-like spherical morphology, the thickness of the petal sheets is 1-30 nm, the size of the petal sheet-shaped spherical particles is 400-10 [mu]m, and the petal sheet-shaped spherical particles are used as a positive electrode material in a potassium ion battery. The charging and discharging interval is 1.5-4 V, the current density is 1000mA g<-1>, and the first specific discharge capacity is 141 mAhg<-1>. And after 100 circles of circulation, the specific discharge capacity is 80 mAhg<-1>.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-efficiency energy storage new energy materials, and in particular relates to a method for preparing a positive electrode material of a potassium ion battery and a petal-shaped spherical birnessite material. Background technique [0002] As fossil fuel consumption and global warming intensify, the development of renewable energy is critical. Electrochemical energy storage is considered to be the preferred technology for energy storage systems due to its advantages such as flexible equipment, easy scale-up, limited geographic location, low maintenance cost, high energy density, high cycle efficiency, and long life. [0003] Lithium-ion batteries, which are prioritized for development, are now encountering a "bottleneck period". Energy density increases slowly, but costs continue to rise. Challenges have been encountered on all fronts. Therefore, looking for a new secondary battery tech...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M10/054C01G45/02B82Y30/00B82Y40/00
CPCH01M4/505H01M10/054C01G45/02B82Y40/00B82Y30/00C01P2004/32C01P2004/45C01P2004/24Y02E60/10
Inventor 杨儒李敏陈志宇徐杰
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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