Method for preparing carbon-coated MnO coaxial nanowire cathode material for lithium ion batteries

A lithium-ion battery and negative electrode material technology, applied in the field of electrochemistry, can solve the problems of unsatisfactory cycle performance and rate performance, difficulty in obtaining carbon coating layer, unsuitable for industrial production, etc., achieve excellent cycle stability and improve cycle performance. The effect of stability and structural stability

Inactive Publication Date: 2012-12-05
SHANDONG UNIV
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Problems solved by technology

However, the conductivity of the MnO material itself is low, and the cycle performance and rate performance are not ideal. Carbon coating or composite materials with activated carbon materials are usually used to improve its energy density and power density.
According to previous reports, most carbon-coated MnO nanomaterials are obtained by mixing active substances (such as MnO, etc.) Composite materials, see J.Power Sourecs195.2010.3300; Chem.Commun.48.2012.8502.; However, these methods are difficult to obtain a uniform carbon coating, and the method is complicated, not suitable for industrial production
There is no report on the synthesis of carbon-coated manganese oxide coaxial nanowires by chemical vapor deposition

Method used

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  • Method for preparing carbon-coated MnO coaxial nanowire cathode material for lithium ion batteries
  • Method for preparing carbon-coated MnO coaxial nanowire cathode material for lithium ion batteries
  • Method for preparing carbon-coated MnO coaxial nanowire cathode material for lithium ion batteries

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Embodiment 1

[0033] Embodiment 1: A kind of preparation method of carbon coated MnO coaxial nanowire negative electrode material for lithium ion battery, the steps are as follows:

[0034] (1) Preparation of manganese oxyhydroxide nanowires:

[0035] Add 2mL of polyethylene glycol 400 and 0.1g of potassium permanganate to 40mL of purified water, put it into a 60mL reaction kettle, put the reaction kettle into an oven, heat at 170°C for 6 hours, and then naturally cool to room temperature , dried at 80°C after centrifugation to obtain manganese oxyhydroxide nanowires;

[0036] (2) Preparation of porous manganese trioxide nanowires:

[0037] Put the manganese oxyhydroxide nanowires obtained in step (1) into a tube furnace, raise the temperature up to 600°C at a rate of 5°C per minute in an air atmosphere, keep it for 5 hours, and then cool it down to room temperature naturally to obtain porous trioxide Dimanganese nanowires;

[0038] (3) Preparation of carbon-coated MnO coaxial nanowire a...

Embodiment 2

[0042]Example 2: Electrochemical performance test of carbon-coated MnO nanowires

[0043] The carbon-coated MnO nanowire prepared in Example 1 is the negative electrode material, and the electrode is made according to the existing technology, and its electrochemical performance is characterized, and the specific steps are as follows:

[0044] (1) Preparation of electrodes:

[0045] Mix the conductive agent: binder: active material (carbon-coated MnO nanowire material) in a mass ratio of 20:10:70, the conductive agent is acetylene black, and the binder is polyvinylidene fluoride (pvdf) , the binder is dissolved in N-methylpyrrolidone to form a solution with a mass concentration of 10% before mixing; it is evenly coated on the copper foil current collector with a film applicator, and vacuum baked at 80°C for 12 hours, Then cut into electrode sheets with a diameter of 12mm;

[0046] (2) Single electrode test:

[0047] A single-electrode test was formed in the glove box, the li...

Embodiment 3

[0050] Embodiment 3: A kind of preparation method of carbon coated MnO coaxial nanowire negative electrode material for lithium ion battery, the steps are as follows:

[0051] (1) Preparation of manganese oxyhydroxide nanowires:

[0052] Add 1mL of polyethylene glycol 200 and 0.1g of potassium permanganate to 30mL of purified water, put it into a 60mL reaction kettle, put the reaction kettle into an oven, heat at 160°C for 5 hours, and then cool down to room temperature naturally , dried at 60°C after centrifugation to obtain manganese oxyhydroxide nanowires;

[0053] (2) Preparation of porous manganese trioxide nanowires:

[0054] Put the manganese oxyhydroxide nanowires obtained in step (1) into a tube furnace, raise the temperature to 550°C at a rate of 5°C per minute in an air atmosphere, keep it for 3 hours, and then cool it down to room temperature naturally to obtain porous trioxide Dimanganese nanowires;

[0055] (3) Preparation of carbon-coated MnO coaxial nanowire...

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Abstract

The invention discloses a method for preparing a carbon-coated MnO coaxial nanowire cathode material for lithium ion batteries. The method includes: using polyethylene glycol and potassium permanganate to prepare hydroxyl manganese oxide nanowires, heating the hydroxyl manganese oxide nanowires at 550-650 DEG C for 3-10h, naturally cooling to the room temperature to obtain porous manganese sesquioxide nanowires, feeding mixed gas of acetylene and argon or nitrogen to the porous manganese sesquioxide nanowires at 500-600 DEG C, and cooling to obtain the carbon-coated MnO coaxial nanowire cathode material for lithium ion batteries. The carbon-coated MnO coaxial nanowire cathode material for lithium ion batteries is uniform in carbon layer thickness, stable in structure, simple in preparation method and high in industrial applicability, cycling stability, specific capacity and magnification performance of the cathode material for the lithium ion batteries can be improved, and accordingly energy density and power density are improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a preparation method of a negative electrode material of a lithium ion battery, in particular to a preparation method of a carbon-coated MnO coaxial nanowire negative electrode material for a lithium ion battery. Background technique [0002] With the emergence of the energy crisis, lithium-ion batteries have attracted increasing attention because of their advantages such as high energy density, stable voltage, long cycle life and low self-discharge rate. With the development of lithium-ion batteries in the field of electric vehicles and miniaturized electronic equipment, people put forward higher requirements for the current commercial lithium-ion batteries, hoping to further improve their energy density and safety performance. The positive and negative electrode materials of lithium-ion batteries are the core factors that determine their performance. The current commerci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/50
CPCY02E60/12Y02E60/10
Inventor 李晓伟熊胜林钱逸泰马小建
Owner SHANDONG UNIV
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