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Method for preparing high performance lithium ion battery negative electrode material porous carbon covering exposed (001) active crystal titanium dioxide nanocubes

A technology of lithium-ion batteries and nanocubes, which is applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problems of poor rate performance and cycle stability of lithium-ion batteries, and achieve excellent electrochemical performance , Uniform coating, low cost effect

Inactive Publication Date: 2015-12-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although some progress has been made in research, there are disadvantages such as poor rate performance and cycle stability when applied to lithium-ion batteries.
[0006] In the present invention, the porous carbon material with large surface area is compounded with titanium dioxide nano-cubes with exposed (001) active surface to improve the electronic conductivity of titanium dioxide. This method has not yet been reported in literature and patents.

Method used

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  • Method for preparing high performance lithium ion battery negative electrode material porous carbon covering exposed (001) active crystal titanium dioxide nanocubes
  • Method for preparing high performance lithium ion battery negative electrode material porous carbon covering exposed (001) active crystal titanium dioxide nanocubes
  • Method for preparing high performance lithium ion battery negative electrode material porous carbon covering exposed (001) active crystal titanium dioxide nanocubes

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Embodiment 1

[0030] A method for preparing a high-performance lithium-ion battery negative electrode material porous carbon coating exposed (001) active crystal surface titanium dioxide nano-cube, comprising the following steps:

[0031] a. Preparation of phenolic resin spheres

[0032] Add a certain amount of phenol into a mixed solvent of absolute ethanol and deionized water with a certain volume ratio, then add a certain amount of ammonia water, stir for 0.25h at a constant temperature of 25°C, and add a certain amount of deionized water after the phenol is completely dissolved. Hexaalkyltrimethylammonium bromide, continue to stir at a constant temperature of 25°C for 0.5h, then add a certain amount of formaldehyde solution, stir at a constant temperature of 25°C for 24h, transfer the solution to a high-pressure reactor, and conduct water under the condition of 80°C Heat the reaction for 24 hours, cool naturally to room temperature after the reaction, centrifuge, wash, separate and free...

Embodiment 2

[0041] A method for preparing a high-performance lithium-ion battery negative electrode material porous carbon coating exposed (001) active crystal surface titanium dioxide nano-cube, comprising the following steps:

[0042] a. Preparation of phenolic resin spheres

[0043] Add a certain amount of phenol into a mixed solvent of absolute ethanol and deionized water with a certain volume ratio, then add a certain amount of ammonia water, stir for 0.25h at a constant temperature of 25°C, and add a certain amount of deionized water after the phenol is completely dissolved. Hexaalkyltrimethylammonium bromide, continue to stir at a constant temperature of 25°C for 0.5h, then add a certain amount of formaldehyde solution, stir at a constant temperature of 25°C for 24h, transfer the solution to a high-pressure reactor, and conduct water under the condition of 80°C Heat the reaction for 24 hours, cool naturally to room temperature after the reaction, centrifuge, wash, separate and free...

Embodiment 3

[0052] A method for preparing a high-performance lithium-ion battery negative electrode material porous carbon coating exposed (001) active crystal surface titanium dioxide nano-cube, comprising the following steps:

[0053] a. Preparation of phenolic resin spheres

[0054] Add a certain amount of phenol into a mixed solvent of absolute ethanol and deionized water with a certain volume ratio, then add a certain amount of ammonia water, stir for 0.25h at a constant temperature of 25°C, and add a certain amount of deionized water after the phenol is completely dissolved. Hexaalkyltrimethylammonium bromide, continue to stir at a constant temperature of 25°C for 0.5h, then add a certain amount of formaldehyde solution, stir at a constant temperature of 25°C for 24h, transfer the solution to a high-pressure reactor, and conduct water under the condition of 80°C Heat the reaction for 24 hours, cool naturally to room temperature after the reaction, centrifuge, wash, separate and free...

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Abstract

The invention discloses a method for preparing high performance lithium ion battery negative electrode material porous carbon covering exposed (001) active crystal titanium dioxide nanocubes. The method for preparing the high performance lithium ion battery negative electrode material porous carbon covering exposed (001) active crystal titanium dioxide nanocubes adopts phenolic resin spheres as a carbon source to compound porous carbon materials, wherein titanium source compounds are dissolved into ethyl alcohol to be prepared to be colloidal sol, the colloidal sol is added into a supernatant solution of phenolic resins, deionized water and hydrochloric acids to be stirred, and is added with hydrofluoric acids to be used as a crystal control agent, and then has a water thermal reaction, thereby obtaining product materials by utilizing a high temperature furnace to treat at last. A composite material which is composted through the method has large radio surface area, rich porous structures, exposed active crystal surfaces, combines the advantages of the radio surface area, porous structures and active crystal surfaces, reduces transmission distance of ions and electrons, improves electrical conductivity and ionic diffusion rate, is applied in lithium ion batteries, has excellent specific capacity and stable cycle performance, and is an ideal lithium ion battery negative material.

Description

technical field [0001] The invention belongs to the field of preparation and application of new energy materials, and in particular relates to a preparation method for synthesizing high-performance lithium-ion battery anode material porous carbon coated exposed (001) active crystal plane titanium dioxide nano-cubes based on a solvothermal method. Background technique [0002] Due to the advantages of high working voltage, high specific energy, wide working temperature range, stable discharge, no memory effect and low discharge rate, lithium-ion batteries are widely used as a new type of energy storage power supply in communication equipment, power vehicles, aerospace, etc. and other fields. As one of the key materials of lithium-ion batteries, anode materials play an important role in the development of high-performance lithium-ion batteries. [0003] Titanium dioxide has attracted much attention due to its low price, environmental friendliness, and abundant resources. Comp...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 曹传宝王琳
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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