Potassium manganate/carbon composite material with core-shell structure and preparation method and application thereof

A technology of carbon composite materials and structural potassium manganate, which is applied in the preparation/purification of carbon, manganate/permanganate, structural parts, etc., and can solve the problems of poor conductivity stability and hindering the application of manganese-based cathode materials , to achieve the effect of improving conductivity, improving cycle stability, and excellent rate performance

Pending Publication Date: 2021-11-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low intrinsic conductivity of inorganic manganese oxides and the existence of the Jahn-Teller effect lead to poor stability, which hinders the further application of manganese-based cathode materials.

Method used

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  • Potassium manganate/carbon composite material with core-shell structure and preparation method and application thereof
  • Potassium manganate/carbon composite material with core-shell structure and preparation method and application thereof
  • Potassium manganate/carbon composite material with core-shell structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Prepared core-shell structure potassium manganate / carbon composite material (silicon source is tetraethyl orthosilicate)

[0042] Preparation technology flow chart as figure 1 As shown, mix 70mL of ethanol, 10mL of deionized water and 3mL of ammonia water (25%), then add 6mL of ethyl orthosilicate, stir for 15min, add 0.4g of resorcinol, stir for 30min, then add 0.56mL of Forol Marlin solution was stirred continuously at room temperature for 24 h at last, and the resulting precipitate was centrifuged five times with deionized water and ethanol, and o After drying at C for 10 h, orange SiO was finally obtained 2 @resorcinol−formaldehyde (RF) oligomers (SiO 2 @RF). The SiO obtained in the first step 2 @RF at 750 o Carbonization at C for 5h to obtain SiO 2 @C Composite. MnCl 4 • 4H 2 O (0.4 mmol) and NH 4 Cl (20 mmol) was dissolved in 30 mL water at room temperature to obtain solution A, 50 mg of SiO 2 @C is ultrasonically dispersed into 20mL water to...

Embodiment 2

[0045] Example 2: Prepared core-shell structure potassium manganate / carbon composite material (silicon source is propyl orthosilicate)

[0046] Preparation technology flow chart as figure 1 As shown, mix 70mL of ethanol, 10mL of deionized water and 3mL of ammonia water (25%), then add 3.46mL of propyl orthosilicate, stir for 15min, add 0.4g of resorcinol, stir for 30min, then add 0.56mL of formalin solution, and finally stirred continuously at room temperature for 24 h, and the resulting precipitate was centrifuged five times with deionized water and ethanol, and o After drying at C for 10 h, orange SiO was finally obtained 2 @resorcinol−formaldehyde (RF) oligomers (SiO 2 @RF). The SiO obtained in the first step 2 @RF at 750 o Carbonization at C for 5h to obtain SiO 2 @C Composite. MnCl 4 • 4H 2 O (0.4mmol) and NH 4 Cl (20 mmol) was dissolved in 30 mL water at room temperature to obtain solution A, 50 mg of SiO 2 @C is ultrasonically dispersed into 20mL water to for...

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Abstract

The invention relates to a potassium manganate / carbon composite material with a core-shell structure and a preparation method and application thereof. The preparation method comprises the steps that a silicon source, resorcinol and a formalin solution serve as raw materials, phenolic resin-coated silicon dioxide microspheres are synthesized, carbon-coated silicon dioxide microspheres are obtained after high-temperature carbonization, and under the synergistic effect of soluble manganese salt and ammonia water, a manganese silicate / carbon composite material is obtained by a hydrothermal method, and the potassium manganate / carbon composite material with the core-shell structure is finally obtained after the manganese silicate / carbon composite material is etched by a potassium hydroxide solution. The potassium manganate / carbon composite material with the core-shell structure has a large specific surface area, the potassium manganate core has a unique layered structure and can be used as an active substance to store zinc ions, and the carbon shell coated outside the potassium manganate can improve the conductivity of the composite material and regulate and control the volume change of the potassium manganate in the cycle process, and the electrochemical performance of the zinc ion battery is synergistically improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemistry, and specifically relates to a core-shell structure potassium manganate / carbon composite material and its preparation method and application, especially a core-shell structure potassium manganate / carbon composite material and its preparation method and The application of the core-shell structure potassium manganate / carbon composite material as a high-performance positive electrode of a zinc-ion battery. Background technique [0002] With the development of society, great changes have taken place in the mode of production, and the traditional non-renewable resources are becoming increasingly exhausted. The energy problem has become a challenge that human beings must face. Fortunately, with the continuous innovation of science and technology, the continuous progress of chemical energy storage technology has promoted the development of lithium-ion battery storage technology, making lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/36C01B32/05C01G45/12
CPCH01M4/366H01M4/505H01M4/625H01M10/36C01B32/05C01G45/1214C01P2004/80C01P2002/72C01P2004/03C01P2004/04C01P2006/40H01M2004/021H01M2004/028Y02E60/10
Inventor 曲晋翟显治王娟
Owner BEIJING UNIV OF CHEM TECH
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