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Alkali metal secondary battery negative electrode active material and preparation method thereof

A negative electrode active material and secondary battery technology, applied in the field of electrochemical power supply, can solve problems such as poor material rate performance, achieve the effects of low price, maintain structural stability, and accelerate electron transfer

Active Publication Date: 2018-06-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the nano-Fe2O3 particles and nano-iron particles generated in situ by sintering in air improve the electronic conductivity of the material and solve the problem of poor rate performance of the material.

Method used

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  • Alkali metal secondary battery negative electrode active material and preparation method thereof
  • Alkali metal secondary battery negative electrode active material and preparation method thereof
  • Alkali metal secondary battery negative electrode active material and preparation method thereof

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preparation example Construction

[0049] The sample preparation process is as follows: take the sample powder, add absolute ethanol, and obtain a sample suspension after ultrasonic dispersion, use a dropper to take the suspension and drop it on the copper grid or carbon film, vacuumize and dry it, and then send it to the sample room for observation. The instrument model is HRTEM, TecnaiG2 F20 S-TWIN, 200KV.

[0050] (2) Transmission electron microscope (TEM) test of the negative electrode active material:

[0051] The sample preparation process is as follows: take the sample powder, add absolute ethanol, and obtain a sample suspension after ultrasonic dispersion, use a dropper to take the suspension and drop it on the copper grid or carbon film, vacuumize and dry it, and then send it to the sample room for observation. The instrument model is HRTEM, TecnaiG2 F20 S-TWIN, 200KV.

[0052] (3) X-ray diffraction (XRD) test of negative electrode active material:

[0053] The crystal structure of the material was c...

Embodiment 1

[0063] This embodiment is used to illustrate the preparation of the negative electrode active material of the present invention and its application in sodium-ion secondary batteries and lithium-ion secondary batteries. The specific steps are:

[0064] (1) Weigh 30mg of surfactant PVP-K30 and dissolve it in 60ml of ethylene glycol solvent, and magnetically stir for 360min to dissolve it; under magnetic stirring, add 30mg of Fe(NO 3 ) 3 9H 2 O, continue to stir for 2h, obtain mixed solution 1;

[0065] (2) Transfer the mixed solution 1 to a three-necked flask and put it in an oil bath, add condensed water to reflux, control the stirring speed to 600r / min, and reflux at 90°C for 90min. After the reaction is completed, transfer it to the reactor and seal it. , react at 180°C for 12h, centrifuge, wash the precipitate with ethanol, and dry at 60°C to obtain precursor particles.

[0066] (3) Weigh 100 mg of titanium isopropoxide and dissolve it in 30 ml of ethanol to obtain mixed ...

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Abstract

The invention belongs to the field of electrochemical power supply, and particularly relates to an alkali metal secondary battery negative electrode active material and a preparation method thereof. The negative active material is of a fully-coated spherical core-shell structure, wherein a shell is nanometer titanium dioxide, a core comprises nanometer iron trioxide, and the mass ratio of elementiron and element titanium is (5-15):1. The volume expansion in the charge-discharge process is favorably reduced by a unique structure of the material, and the structure stability of the active material during the circulation process is promoted; and meanwhile, the electron conductivity of the material is favorably improved by nanometer iron particles generated in an in-situ way, and electron transfer among active substance particles is accelerated. The material is the alkali metal secondary battery negative electrode active material and is compatible with various characteristics of high capacity, high cycle stability and the like under the condition that a conductive agent carbon source is not introduced, and the material is a low-cost, environmental-friendly and novel energy-storage battery negative active material.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, and in particular relates to an alkali metal secondary battery negative electrode active material and a preparation method thereof. Background technique [0002] In recent years, with the promotion of energy storage systems such as electric vehicles and smart grids, people's demand for high energy density secondary battery systems has become more urgent. Alkali metal secondary batteries mainly include lithium ion secondary batteries, sodium ion secondary batteries, and the like. Lithium-ion secondary batteries have the advantages of high voltage, high capacity, high power density, long cycle life and no memory effect, and are widely used in portable electronic devices, electric vehicles, defense industry and portable electronic devices. However, lithium-ion secondary batteries have problems such as high cost, short life, and potential safety hazards. In addition, the storage of lithi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M10/0525H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/483H01M4/523H01M10/0525H01M10/054Y02E60/10
Inventor 陈人杰罗锐谢嫚马一添周佳辉吴锋李丽
Owner BEIJING INSTITUTE OF TECHNOLOGYGY