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Preparation method of TiO2-TiNb2O7 composite negative electrode material for lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as high equipment requirements and complex electrospinning processes, and achieve wide application scenarios and good machining capabilities. , cost saving effect

Pending Publication Date: 2022-07-26
中国人民解放军军事科学院防化研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Tang et al. (Advanced Energy Materials, 2013, 3(1): 49-53), Zhu et al. (Advanced Materials Interfaces, 2020, 7(16): 2000705), Tian et al. (Advanced Functional Materials, 2021, 31(4): 2007419 ) TiNb was prepared by electrospinning 2 o 7 Nanofibers, but the electrospinning process is complex and requires high equipment

Method used

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  • Preparation method of TiO2-TiNb2O7 composite negative electrode material for lithium ion battery
  • Preparation method of TiO2-TiNb2O7 composite negative electrode material for lithium ion battery
  • Preparation method of TiO2-TiNb2O7 composite negative electrode material for lithium ion battery

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Embodiment 1

[0031] TiO for lithium ion battery of the present invention 2 -TiNb 2 O 7 The steps of the preparation method of the composite negative electrode material are as follows:

[0032] Step 1: TiO 2 Fiber surface functionalization treatment

[0033] Put 10g TiO into the reactor 2 Fiber and 7mol / L NaOH solution, so that the NaOH solution is immersed in TiO 2 Fiber, seal the reactor, transfer the reactor to an oven at 210°C, and let it stand at 210°C for 5 days.

[0034] After the reactor was naturally cooled to room temperature, the reactor was taken out, and the TiO was taken out. 2 Fibers were washed with deionized water until the solution was at neutral pH=7.

[0035] Obtain surface functionalized TiO 2 fibers, such as figure 2 shown.

[0036] Step 2: TiO 2 Deposition of Nb(OH) on the fiber surface 5 particles

[0037] Take 20g of niobium pentachloride (NbCl 5 ) dissolved in methanol to give NbCl 5 Methanol solution to functionalize the surface of TiO 2 Fiber immer...

Embodiment 2

[0043] TiO for lithium ion battery of the present invention 2 -TiNb 2 O 7 The steps of the preparation method of the composite negative electrode material are as follows:

[0044] Step 1: TiO 2 Fiber surface functionalization treatment

[0045] Put 5g TiO into the reactor 2 Fiber and 5mol / L NaOH solution, so that the NaOH solution is immersed in TiO 2 Fiber, seal the reactor, transfer the reactor to an oven at 230°C, and let stand at 230°C for 2 days.

[0046] After the reactor was naturally cooled to room temperature, the reactor was taken out, and the TiO was taken out. 2 Fibers were washed repeatedly with deionized water until the solution was at neutral pH=7.

[0047] Obtain surface functionalized TiO 2 fibers, such as Figure 4 shown.

[0048] Step 2: TiO 2 Deposition of Nb(OH) on the fiber surface 5 particles

[0049] Take 15g of niobium pentachloride (NbCl 5 ) dissolved in methanol to give NbCl 5 Methanol solution to functionalize the surface of TiO 2 Fi...

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Abstract

The invention discloses a preparation method of a TiO2-TiNb2O7 composite negative electrode material for a lithium ion battery, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: (1) putting TiO2 fibers into a NaOH solution, and carrying out functionalization treatment on the surfaces of the TiO2 fibers; (2) immersing the TiO2 fiber subjected to surface functionalization treatment into an NbCl5 methanol solution, and depositing Nb (OH) 5 particles on the surface of the TiO2 fiber; and (3) carrying out high-temperature heat treatment on the TiO2 fiber on which the Nb (OH) 5 particles are deposited, so as to obtain the TiO2-TiNb2O7 composite material. According to the method disclosed by the invention, the obtained TiO2-TiNb2O7 composite negative electrode material is of a nanofiber structure, rapid deintercalation of lithium ions is realized, and the material has rapid charging and discharging capability; and the TiO2-TiNb2O7 composite negative electrode material has a self-supporting capability and can be directly used as an electrode when being used in the field of lithium ion batteries, and compared with an existing battery electrode preparation process, foil and electrode coating are omitted, the cost is saved, and the application prospect is wide.

Description

technical field [0001] The present invention relates to a kind of TiO for lithium ion battery 2 -TiNb 2 O 7 The invention relates to a preparation method of a composite negative electrode material, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high operating voltage, high safety performance, wide operating temperature range, and long cycle life. They have been widely used in portable electronic products, electric vehicles, energy storage power stations and other fields. mainstream development direction. [0003] The main constituent materials of lithium-ion batteries include positive and negative electrode materials, electrolytes, and separator materials. As the key material, the choice of negative electrode material directly determines the performance of the battery. [0004] In 2011, the Goodenough research group firstly used TiNb 2 O 7 As a negative electrod...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M10/0525C01G33/00
CPCH01M4/483H01M10/0525C01G33/00H01M2004/021H01M2004/027C01P2004/03Y02E60/10
Inventor 王跃邱景义文越华张松通祝夏雨
Owner 中国人民解放军军事科学院防化研究院
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