Synthesis method and application of mixed valence manganese-based oxide composite material

A technology of manganese-based oxides and composite materials, which is applied in the field of high-rate charging and discharging, can solve problems such as unfavorable battery rate performance, and achieve the effects of promoting electrochemical performance, improving the first Coulombic efficiency, and being environmentally friendly

Active Publication Date: 2021-07-27
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the metal element is in a high valence state, the electronegativity of oxygen has a great influence on the metal oxide, making the manganese oxide more n

Method used

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  • Synthesis method and application of mixed valence manganese-based oxide composite material
  • Synthesis method and application of mixed valence manganese-based oxide composite material
  • Synthesis method and application of mixed valence manganese-based oxide composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Dissolve 1 mmol of manganese acetate and 10 mmol of ammonium bicarbonate into 30 mL of ethylene glycol solution, stir evenly, transfer to a 50 mL reactor, and react with solvothermal reaction at 180 °C for 12 h; After cooling, centrifuge washing and drying to obtain a white powdery manganese carbonate micro-nanosphere precursor;

[0041] (2) Dissolve 50 mg of manganese carbonate precursor and 100 mg of dopamine hydrochloride in Tris buffer solution with pH = 8.5, carry out self-polymerization reaction at room temperature, then centrifuge, wash and dry the black product to obtain manganese carbonate / polymer Dopamine intermediate;

[0042](3) The intermediate was placed in a tube furnace and annealed under the protection of a nitrogen atmosphere. The temperature was first raised to 700°C for 5 hours, and then cooled to 500°C for 2 hours to obtain carbon-coated, first-class nanoparticles. Composed of secondary porous nano-MnO (MnO@NC) composites with 3D structure;

...

Embodiment 2

[0049] (1) Dissolve 1 mmol of manganese acetate and 5 mmol of ammonium bicarbonate in 30 mL of ethylene glycol solution, stir evenly, transfer to a 50 mL reaction kettle, and react with solvothermal reaction at 150 °C for 12 h; After cooling, centrifugal washing, and drying, the manganese carbonate microsphere precursor of white powder is obtained;

[0050] (2) Dissolve 100 mg of manganese carbonate precursor and 50 mg of dopamine hydrochloride in a Tris buffer solution with pH=8.5, carry out self-polymerization reaction at room temperature, then centrifuge the black product, wash and dry to obtain manganese carbonate / polydopamine Intermediate;

[0051] (3) Place the intermediate in a tube furnace and anneal it under the protection of a nitrogen atmosphere. The temperature is first raised to 500°C and kept for 7 hours to obtain a secondary porous layer with a 3D structure that is coated with a carbon layer and composed of primary nanoparticles. Nano-MnO (MnO@NC) composite mat...

Embodiment 3

[0054] (1) Dissolve 1 mmol of manganese acetate and 8 mmol of ammonium bicarbonate in 30 mL of ethylene glycol solution, stir evenly, transfer to a 50 mL reaction kettle, and react with solvothermal reaction at 180 °C for 10 h; After cooling, centrifugal washing, and drying, the manganese carbonate microsphere precursor of white powder is obtained;

[0055] (2) Dissolve 100 mg of manganese carbonate precursor and 100 mg of dopamine hydrochloride in a Tris buffer solution with pH=8.5, carry out self-polymerization reaction at room temperature, then centrifuge the black product, wash and dry to obtain manganese carbonate / polydopamine Intermediate;

[0056] (3) The intermediate was placed in a tube furnace and annealed under the protection of a nitrogen atmosphere. The temperature was first raised to 600°C for 5 hours, and then cooled to 500°C for 2 hours to obtain carbon-coated, first-class nanoparticles. Composed of secondary porous nano-MnO (MnO@NC) composites with 3D structu...

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Abstract

The invention belongs to the field of lithium ion battery energy storage, and discloses a preparation method and application of a mixed valence manganese-based oxide composite material. The method comprises the following steps: dissolving manganese salt and carbonate and/or bicarbonate in an alcohol organic solvent, and carrying out solvent heat treatment at 150-200 DEG C to obtain a manganese carbonate precursor; performing dopamine hydrochloride interface modification and calcination treatment to obtain a MnO@NC composite intermediate; and finally, the intermediate is subjected to oxidation treatment, 87.9% of MnO is oxidized into Mn3O4, and the secondary porous mixed-valence manganese-based oxide (MnO/Mn3O4@NC) nano composite material which is coated with a carbon layer and composed of primary nano particles and has a 3D structure is obtained. The preparation method is simple and low in cost; and the prepared MnO/Mn3O4@NC composite material is stable in structure, and has excellent lithium storage capacity, reaction reversibility and rate capability as a lithium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and specifically relates to a method for improving the lithium storage capacity, reaction reversibility, and high-rate charge and discharge of electrode materials by increasing the valence state of element manganese and its application. Background technique [0002] At present, the commercial lithium-ion battery anode materials are mainly graphite materials, but the low theoretical specific capacity of graphite (372 mAh / g) is difficult to meet the increasing demand for energy density. Therefore, it is necessary to seek excellent electrochemical performance Alternative materials have become a research hotspot. Transition metal oxides TMOs (M=Co, Ni, Cu, Fe, and Mn) are cheap, resource-rich, environmentally friendly, and have a high theoretical specific capacity (about 1000 mAh / g). One of the anode materials for the first generation of lithium-ion batteries. [0003] Among many transi...

Claims

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Application Information

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IPC IPC(8): C01G45/02C01B32/05H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCC01G45/02C01B32/05H01M4/483H01M4/625H01M10/0525B82Y30/00B82Y40/00C01P2004/80C01P2002/72C01P2002/82C01P2004/03C01P2004/04C01P2006/40C01P2004/62C01P2004/32Y02E60/10
Inventor 秦艳敏张珊包海峰方正陈亚洲李娜李晨
Owner WUHAN TEXTILE UNIV
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