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Nano titanium dioxide/graphene negative electrode material and preparation method thereof

A nano-titanium dioxide and graphene negative electrode technology, applied in the field of electrochemical materials, can solve the problems of lack of channels, easy to agglomerate, reduce the charge-discharge capacity and cycle rate of lithium-ion batteries, etc., and achieve good penetration, high repeatability, Effect of excellent electronic conductivity

Active Publication Date: 2021-11-19
广州明美新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the titanium dioxide material lacks internal channels before modification, which greatly reduces the actual capacity and cycle rate of the lithium-ion battery during charging and discharging, and the titanium dioxide lattice will produce a certain amount of energy during the insertion and extraction of lithium ions. Twisted, the diffusion of lithium ions is limited by short titanium dioxide bonds; at the same time, the negative electrode material made of nano titanium dioxide is prone to agglomeration during battery cycling

Method used

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  • Nano titanium dioxide/graphene negative electrode material and preparation method thereof
  • Nano titanium dioxide/graphene negative electrode material and preparation method thereof
  • Nano titanium dioxide/graphene negative electrode material and preparation method thereof

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Embodiment 1

[0047] A kind of embodiment of the preparation method of nano titanium dioxide / graphene negative electrode material of the present invention, comprises the following steps:

[0048] (1) Add 0.27mL ammonia water, 5mL butyl titanate and 0.25g sodium fluoroborate successively to the graphene oxide suspension in the ice bath, mix and stir evenly, continue the ice bath for 15min, and obtain the precursor solution A; the graphene oxide The preparation method of the suspension is as follows: prepare graphite oxide by the Hummer method, sonicate 16mg of graphite oxide in 80mL of ethanol with a 250W ultrasonic instrument for 3h to form a graphene oxide suspension, and ice-bath for 30min;

[0049] (2) Put the precursor solution A obtained in step (1) in a 100mL closed reaction kettle, and perform a solvothermal reaction at 90°C for 10 hours to obtain the precursor B;

[0050] (3) The precursor B in step (2) was washed with ethanol, dried, then placed under a nitrogen atmosphere, and sub...

Embodiment 2

[0055] A kind of embodiment of the preparation method of nano titanium dioxide / graphene negative electrode material of the present invention, comprises the following steps:

[0056] (1) Add 0.35mL ammonia water, 7mL butyl titanate and 0.15g sodium fluoroborate successively to the graphene oxide suspension in the ice bath, mix and stir evenly, and continue the ice bath for 15min to obtain the precursor solution A; the graphene oxide The preparation method of the suspension is as follows: prepare graphite oxide by the Hummer method, sonicate 30 mg of graphite oxide in 80 mL of ethanol with a 250 W ultrasonic instrument for 3 h to form a graphene oxide suspension, and ice-bath for 30 min;

[0057] (2) Put the precursor solution A obtained in step (1) in a 100mL closed reaction kettle, and perform a solvothermal reaction at 90°C for 10 hours to obtain the precursor B;

[0058] (3) The precursor B in step (2) was washed with ethanol, dried, then placed under a nitrogen atmosphere, ...

Embodiment 3

[0062] A kind of embodiment of the preparation method of nano titanium dioxide / graphene negative electrode material of the present invention, comprises the following steps:

[0063] (1) Add 0.3mL ammonia water, 7.5mL butyl titanate and 0.2g sodium fluoroborate successively to the graphene oxide suspension in the ice bath, mix and stir evenly, and continue the ice bath for 15min to obtain the precursor solution A; the graphite oxide The preparation method of the olefin suspension is: adopt the Hummer method to prepare graphite oxide, 20mg of graphite oxide is used in 80mL ethanol with a 250W ultrasonic instrument for 3h to form a graphene oxide suspension, and ice bath for 30min;

[0064] (2) Put the precursor solution A obtained in step (1) in a 100mL closed reaction kettle, and perform a solvothermal reaction at 90°C for 10 hours to obtain the precursor B;

[0065] (3) The precursor B in step (2) was washed with ethanol, dried, then placed under a nitrogen atmosphere, and sub...

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Abstract

The invention discloses a nano titanium dioxide / graphene negative electrode material and a preparation method thereof, and belongs to the field of electrochemical materials. According to the preparation method of the nano titanium dioxide / graphene negative electrode material, titanium dioxide with nano morphology is generated on graphene oxide through in-situ assembly of a hydrothermal method, meanwhile, dominant crystal faces are selectively generated by titanium dioxide through addition of fluoroborate, the particle size morphology of titanium dioxide in the prepared material composition is effectively limited, the prepared material is uniformly dispersed and free of agglomeration, the contact resistance is reduced, and the permeation of electrolyte is facilitated, and a final product has high capacity and excellent rate discharge performance; and the preparation method is simple to operate and high in repeatability. The invention also discloses the nano titanium dioxide / graphene negative electrode material prepared by the method and a lithium ion battery further prepared from the nano titanium dioxide / graphene negative electrode material.

Description

technical field [0001] The invention relates to the field of electrochemical materials, in particular to a nano-titanium dioxide / graphene negative electrode material and a preparation method thereof. Background technique [0002] Among the commonly used negative electrode materials, graphite has become the first choice for commercial lithium-ion batteries due to its low cost, good cycle stability, and high lithium insertion capacity. Efficiency; at the same time, graphite has poor compatibility with the organic phase electrolyte of commonly used lithium-ion batteries, and co-intercalation of solvated lithium is prone to occur during the reaction, resulting in a large irreversible capacity of the battery, which makes its cycle life worse; the potential of graphite electrodes decreases When it reaches 0V and lower, it will easily lead to lithium deposition on the graphite electrode, making the safety of the battery worse. Therefore, based on the above defects, more and more s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/483H01M4/587H01M4/628H01M10/0525B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 王锦富刘川里
Owner 广州明美新能源股份有限公司
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