Method for preparing high-coulombic-efficiency lithium ion battery negative pole material chrysanthemum-shaped nanometer titania

A nano-titanium dioxide, lithium-ion battery technology, applied in the direction of titanium dioxide, nanotechnology for materials and surface science, battery electrodes, etc., can solve the problem of lithium-ion batteries not obtaining satisfactory capacity and stable cycle performance, limiting large-scale production and Application and other issues, to achieve good electrochemical performance, excellent electrochemical performance, enrich the effect of mesoporous structure

Inactive Publication Date: 2015-03-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

Although a lot of research work is dedicated to the development of titanium dioxide with hierarchical structure, it has not yet obtained satisfactory capacity and stable cycle performance when applied to lithium-ion batteries, and some research work requires the introduction of surfactants in order to obtain a hierarchical structure, which greatly limits large-scale production. and application

Method used

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  • Method for preparing high-coulombic-efficiency lithium ion battery negative pole material chrysanthemum-shaped nanometer titania
  • Method for preparing high-coulombic-efficiency lithium ion battery negative pole material chrysanthemum-shaped nanometer titania
  • Method for preparing high-coulombic-efficiency lithium ion battery negative pole material chrysanthemum-shaped nanometer titania

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Dissolve 2.3g of tetrabutyl titanate in a certain volume of isopropanol solvent, stir magnetically for 15 minutes to form a clear solution, and then add a certain amount of of the glycerol reagent and continued stirring for 20 minutes to form a clear solution.

[0022] (2) The above solution was transferred to a high-pressure reactor, and hydrothermal reaction was carried out at 180° C. for 14 hours. After the reaction was completed, it was naturally cooled to room temperature, centrifugally washed, separated and dried to obtain titanium dioxide precursor nanomaterials.

[0023] (3) Put the titanium dioxide precursor nanomaterial obtained in the previous step into a high-temperature furnace for heat treatment at 500° C. for 5 hours, and then naturally cool to room temperature to obtain chrysanthemum-shaped nano-titanium dioxide.

[0024] (4) Use the material synthesized in the previous step for the negative electrode material of lithium ion battery, use conductive c...

Embodiment 2

[0027] (1) Dissolve 1.2 g of isopropyl titanate in a certain volume of n-propanol solvent, stir magnetically for 10 minutes to form a clear solution, and then add a certain amount of amount of glycerol reagent and continue to stir for 15 minutes to form a clear solution.

[0028] (2) The above solution was transferred to a high-pressure reactor, and hydrothermal reaction was carried out at 120°C for 36 hours. After the reaction was completed, it was naturally cooled to room temperature, centrifuged, washed, separated and dried to obtain titanium dioxide precursor nanomaterials.

[0029] (3) Put the titanium dioxide precursor nanomaterial obtained in the previous step into a high-temperature furnace for heat treatment at 450° C. for 8 hours, and then naturally cool to room temperature to obtain chrysanthemum-shaped nano-titanium dioxide.

[0030] (4) After the battery is assembled according to the method of Example 1, at 5C (850mA g -1 ) under the current density test, the fir...

Embodiment 3

[0032] (1) Dissolve 3.5g of titanium tetrachloride in a certain volume of n-butanol solvent, form a clear solution after magnetic stirring for 15 minutes, then be 7 according to the volume ratio of n-butanol, ethylene glycol and glycerol mixed solvent: 1 Add a certain amount of ethylene glycol and glycerol mixed reagent, and continue to stir for 20 minutes to form a clear solution.

[0033](2) The above solution was transferred to a high-pressure reactor, and hydrothermal reaction was carried out at 230°C for 10 hours. After the reaction was completed, it was naturally cooled to room temperature, centrifugally washed, separated and dried to obtain titanium dioxide precursor nanomaterials.

[0034] (3) Put the titanium dioxide precursor nanomaterial obtained in the previous step into a high-temperature furnace for heat treatment at 600° C. for 5 hours, and then naturally cool to room temperature to obtain chrysanthemum-shaped nano-titanium dioxide.

[0035] (4) After the batter...

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Abstract

The invention discloses a method for preparing high-coulombic efficiency lithium ion battery negative pole material chrysanthemum-shaped nanometer titania. The method comprises the following steps: dissolving a titanium source compound in short-chain monohydric alcohol, stirring to form a clarified solution, adding polyhydric alcohols, further stirring to form a clarified solution, carrying out a hydrothermal reaction, forming a complex with the titanium source compound by utilizing the polyhydric alcohols as guide agents and inducers, controlling hydrolysis of the titanium source compound by taking the short-chain monohydric alcohol as a dispersing agent so at to generate a titania precursor, and performing low-temperature heat treatment, thereby obtaining the lithium ion battery negative pole material chrysanthemum-shaped nanometer titania. The preparation method disclosed by the invention is simple in process and easy to operate, and raw materials are readily available; the high-coulombic efficiency lithium ion battery negative pole material chrysanthemum-shaped nanometer titania is low in cost and environmentally friendly, special equipment is not needed in the whole reaction process, the industrial production is promoted, the final product is high in quality, and according to the prepared nanometer / micron grading structure, the aims of shortening the ion transport distance and improving the conductivity and ion diffusion rate of the material can be simultaneously achieved, so that the material has excellent rate capability, stable cycle performance and high coulombic efficiency. The material prepared by the invention is an ideal lithium ion negative pole material with wide commercial application prospects.

Description

technical field [0001] The invention belongs to the field of preparation and application of new energy materials, and specifically relates to a method for preparing chrysanthemum-shaped nano-titanium oxide with high reversibility and high Coulombic efficiency based on a solvothermal method. Background technique [0002] As a new generation of clean energy, lithium-ion battery is the leader among many new energy sources. It is known as "21st century green secondary battery" because of its high energy density, long cycle life, low environmental pollution, small self-discharge, The advantages of no "memory effect" are widely used in communication equipment, portable electronic equipment, static energy storage systems and electric vehicle markets, and its electrochemical performance mainly depends on the positive and negative electrode materials. At present, carbon materials are the most commonly used anode materials for commercial lithium-ion batteries, but because the operatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485C01G23/047B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G23/08H01M4/485Y02E60/10
Inventor 曹传宝王琳
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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