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Carbon layer coated nano manganous-manganic oxide shell-core structure material and preparation method thereof

A core-shell structure and coating technology, applied in the direction of nanotechnology, nanotechnology, structural parts, etc., can solve the problems of reduced material capacity, slow electron transmission rate, low rate performance, etc., to promote dispersion and grain growth, The effect of stabilizing cyclic Coulombic efficiency and alleviating structural collapse

Active Publication Date: 2021-02-19
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Of course, Mn 3 o 4 There are two major problems in practical electrochemical applications: (1) In the process of charging and discharging, the metal in its reduced state is prone to agglomeration, and the volume expansion also has a great influence on the stability of the material structure, resulting in the material being charged and discharged. During the discharge process, the capacity decreases and the cycle performance deteriorates; (2) Mn 3 o 4 Low conductivity, slow electron transport rate during charge and discharge, coupled with volume pulverization during cycling further affects electron transport, resulting in lower rate capability
However, no biological template method has been used to prepare Mn 3 o 4 report

Method used

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  • Carbon layer coated nano manganous-manganic oxide shell-core structure material and preparation method thereof
  • Carbon layer coated nano manganous-manganic oxide shell-core structure material and preparation method thereof
  • Carbon layer coated nano manganous-manganic oxide shell-core structure material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] A kind of nano Mn 3 o 4 The synthetic method of @C material comprises the following steps:

[0034] (1) Wash the cabbage leaves with distilled water and soak them in EtOH solution (EtOH:H 2 O=1:1), and use hydrochloric acid to adjust the pH=2~4, pretreatment for two weeks to remove the organic matter and pigment in the cabbage leaves.

[0035] (2) Take out the pretreated cabbage leaves, wash them with distilled water and dry them, then soak them in 50% Mn(NO 3 ) 2The solution prepared with a concentration of 0.05 mol / L Mn(NO 3 ) 2 72 h in aqueous solution.

[0036] (3) Take out the soaked leaves, wash them with distilled water, and dry them at room temperature.

[0037] (4) Calcining the dried leaves, first in N 2 The temperature was raised to 600 °C under the atmosphere, and the heating rate was 10 °C min -1 , keep warm for 2 h, take it out and then raise the temperature to 700 °C in the air atmosphere, the heating rate is 10 °C·min -1 , and finally get the n...

Embodiment 2

[0045] (1) Wash the cabbage leaves with distilled water and soak them in EtOH solution (EtOH:H 2 O=1:1), and use hydrochloric acid to adjust the pH=2~4, pretreatment for two weeks to remove the organic matter and pigment in the cabbage leaves.

[0046] (2) Take out the pretreated cabbage leaves, wash them with distilled water and dry them, then soak them in 50% Mn(NO 3 ) 2 The concentration of solution preparation is 0.10mol / L Mn(NO 3 ) 2 72 h in aqueous solution.

[0047] (3) Take out the soaked leaves, wash them with distilled water, and dry them at room temperature.

[0048] (4) Calcining the dried leaves, first in N 2 The temperature was raised to 600 °C under the atmosphere, and the heating rate was 10 °C min -1 , keep warm for 2 h, take it out and then raise the temperature to 700 °C in the air atmosphere, the heating rate is 10 °C·min -1 , and finally get the nanometer Mn 3 o 4 @C material.

Embodiment 3

[0050] (1) Wash the cabbage leaves with distilled water and soak them in EtOH solution (EtOH:H 2 O=1:1), and use hydrochloric acid to adjust the pH=2~4, pretreatment for two weeks to remove the organic matter and pigment in the cabbage leaves.

[0051] (2) Take out the pretreated cabbage leaves, wash them with distilled water and dry them, then soak them in 50% Mn(NO 3 ) 2 The concentration of solution preparation is 0.15mol / L Mn(NO 3 ) 2 72 h in aqueous solution.

[0052] (3) Take out the soaked leaves, wash them with distilled water, and dry them at room temperature.

[0053] (4) Calcining the dried leaves, first in N 2 The temperature was raised to 600 °C under the atmosphere, and the heating rate was 10 °C min -1 , keep warm for 2 h, take it out and then raise the temperature to 700 °C in the air atmosphere, the heating rate is 10 °C·min -1 , and finally get the nanometer Mn 3 o 4 @C material.

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Abstract

The invention relates to a carbon layer coated nano Mn3O4 shell-core structure material as well as a preparation method and application thereof. The nano Mn3O4@C material is synthesized by taking plant cell tissues as a structure-directing agent through dipping and step-by-step calcining. The synthesized material retains the biological form of a template, oxide nanoparticles and thin-layer biocharare formed in the step-by-step calcination process, retention of the biochar promotes Mn3O4 nano dispersion and grain growth, and the obtained material is uniform and free of obvious agglomeration. In the charging and discharging process of the battery, the biochar can effectively relieve structural collapse caused by lattice shrinkage in the lithium ion deintercalation process and provide support and protection for volume change, and in the circulation process, the carbon layer can limit nanoparticle aggregation and volume expansion and improve the performance of the battery. When the material is used as a lithium ion battery negative electrode material, after 250 cycles, the specific capacity is stabilized at 840 mAhg<-1>, and the cycle Coulombic efficiency is stabilized at 99%.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a carbon layer coated nanometer Mn 3 o 4 Core-shell structural materials and their preparation methods and applications. Background technique [0002] Transition metal oxides have the characteristics of high theoretical specific capacity, abundant resources and relatively green environmental protection, so they have good development prospects in lithium-ion battery anode materials. In 2000, Poizot et al first proposed that transition metals can be combined with Li + A reversible reaction occurs between the Li + storage and release. Among many transition metal oxides, manganese oxides have attracted extensive attention due to their high theoretical specific capacity, abundant reserves, wide distribution, and non-toxicity, and are considered to be very promising substitutes for graphite. According to the current charge-discharge storage mechanism of transition metal oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/50H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 吴正颖俞明浩陈志刚陈丰钱君超林艳
Owner SUZHOU UNIV OF SCI & TECH
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