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A kind of porous sheet tinb for negative electrode of lithium ion battery 2 o 7 Preparation methods of nanocrystals

A lithium-ion battery, flake-shaped technology, applied in battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc., can solve problems such as uneven particle size distribution, fast capacity decay, and large particles

Active Publication Date: 2021-05-14
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] TiNb prepared by traditional solid phase method 2 o 7 Larger particles, generally micron or larger in size, with uneven particle size distribution
When it is used as a lithium battery negative electrode material, the lithium ion transmission distance is longer, the electronic chemical reaction area is smaller, and the utilization rate of active materials is not high; therefore, how to improve TiNb through size and structure optimization 2 o 7 The electronic conductivity and ion diffusion rate of the electrode material, so as to solve the problems of fast capacity decay and poor rate performance during charge and discharge at high current density, are the key factors that determine the TiNb 2 o 7 Whether it can become the key to a new high-performance lithium-ion battery anode material

Method used

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  • A kind of porous sheet tinb for negative electrode of lithium ion battery <sub>2</sub> o <sub>7</sub> Preparation methods of nanocrystals
  • A kind of porous sheet tinb for negative electrode of lithium ion battery <sub>2</sub> o <sub>7</sub> Preparation methods of nanocrystals
  • A kind of porous sheet tinb for negative electrode of lithium ion battery <sub>2</sub> o <sub>7</sub> Preparation methods of nanocrystals

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] porous thin TiNb 2 o 7 The preparation method of nanocrystalline negative electrode material, concrete steps are as follows:

[0023] Step 1: Weigh 0.400g of niobium pentachloride and 0.252g of tetrabutyl titanate and add them into a mixed solution of 15mL of ethylene glycol and 15mL of isopropanol.

[0024] Step 2: Add 0.952 g of hexamethylenetetramine to the solution obtained in Step 1, mix and stir for 0.5 h, and the rotating speed is 500 r / min.

[0025] Step 3: The solution obtained in Step 2 was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, placed in a constant temperature drying oven, and heated at 190° C. for 30 hours.

[0026] Step 4: After the reaction is completed, remove the oily liquid on the upper layer to obtain a white precipitate spread on the bottom, then wash with deionized water and ethanol separately and mix several times, and dry the obtained sample in a vacuum oven at 70°C 12h.

[0027] Step 5: Calcining t...

Embodiment 2

[0030] porous thin TiNb 2 o 7 The preparation method of nanocrystalline negative electrode material, concrete steps are as follows:

[0031] Step 1: Weigh 0.8g of niobium pentachloride and 0.504g of tetrabutyl titanate and add them into a mixed solution of 21mL of ethylene glycol and 42mL of isopropanol.

[0032] Step 2: Add 1.904 g of hexamethylenetetramine to the solution obtained in Step 1, mix and stir for 1 hour, and the rotating speed is 500 r / min.

[0033] Step 3: The solution obtained in Step 2 was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, placed in a constant temperature drying oven, and heated at 180° C. for 36 hours.

[0034]Step 4: After the reaction is completed, remove the oily liquid on the upper layer to obtain a white precipitate spread on the bottom, then wash with deionized water and ethanol separately and mix several times, and dry the obtained sample in a vacuum oven at 70°C 12h.

[0035] Step 5: Calcining the...

Embodiment 3

[0037] porous thin TiNb 2 o 7 The preparation method of nanocrystalline negative electrode material, concrete steps are as follows:

[0038] Step 1: Weigh 0.400g of niobium pentachloride and 0.252g of tetrabutyl titanate and add them into a mixed solution of 18mL of ethylene glycol and 9mL of isopropanol.

[0039] Step 2: Add 0.952 g of hexamethylenetetramine to the solution obtained in Step 1, mix and stir for 0.5 h, and the rotating speed is 400 r / min.

[0040] Step 3: The solution obtained in Step 2 was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, placed in a constant temperature drying oven, and heated at 200° C. for 24 hours.

[0041] Step 4: After the reaction is completed, remove the oily liquid on the upper layer to obtain a white precipitate spread on the bottom, then wash with deionized water and ethanol separately and mix several times, and dry the obtained sample in a vacuum oven at 70°C 12h.

[0042] Step 5: Calcinate th...

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Abstract

A kind of porous thin TiNb for negative electrode of lithium ion battery 2 o 7 The invention discloses a method for preparing nanocrystals, and relates to the technical field of preparation of negative electrode materials for lithium ion batteries. Firstly, titanium source and niobium source are added to the mixed solution of ethylene glycol and isopropanol in a certain proportion, then hexamethylenetetramine is added to mix and stir evenly, then the reaction solution is placed in the reaction vessel for reaction, and finally post-treated Porous and flake TiNb 2 o 7 Nanocrystalline anode materials. The preparation method of the present invention is simple, and the repeatability of the experiment is high; the prepared negative electrode material is in the shape of nano flakes, the flake size is 300-600nm, the thickness is 10-30nm, and has a large specific surface area and porosity, which is beneficial to the electrolyte solution. Permeation and transport of lithium ions, thereby improving the electrochemical performance of the material. As a lithium-ion battery negative electrode, it has high reversible capacity and first-time efficiency, excellent high-rate charge-discharge performance and excellent rate cycle performance.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion battery negative electrode materials, in particular to a porous thin sheet TiNb used for lithium ion battery negative electrodes 2 o 7 Methods of preparing nanocrystals. Background technique [0002] As a new generation of green high-energy batteries, lithium-ion batteries have high energy density, high output power, long service life, small self-discharge and no memory effect, wide operating temperature range (-20 ° C ~ 60 ° C), good cycle performance, A series of advantages such as fast charging and discharging, high charging efficiency (up to 100%), no or little pollution to the environment, etc., have become the main choice of rechargeable batteries for large-scale applications today. [0003] TiNb 2 o 7 As a new type of negative electrode material, it has a higher lithium insertion and extraction potential (about 1.6V), avoids the formation of lithium dendrites and soli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48C01G33/00H01M10/0525B82Y30/00
CPCB82Y30/00C01G33/00C01P2002/72C01P2004/64H01M4/48H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 梁德伟侯子宾董强胡坤宏梁长浩
Owner HEFEI UNIV
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