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Preparation and application of modified ammonium oxytrifluorotitanate for lithium ion battery

An ammonium oxytitanate, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low electronic conductivity of base materials, small ion diffusion coefficient, and limited application of base materials, etc. The effect of simple preparation method, accelerated migration rate, and excellent cycle stability

Active Publication Date: 2020-05-22
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 The base material has low electronic conductivity, small ion diffusion coefficient, and increased electrolyte / electrode interface resistance at high current densities, which limits TiO 2 Application of Base Materials

Method used

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  • Preparation and application of modified ammonium oxytrifluorotitanate for lithium ion battery
  • Preparation and application of modified ammonium oxytrifluorotitanate for lithium ion battery
  • Preparation and application of modified ammonium oxytrifluorotitanate for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of preparation method of the modified ammonium trifluorooxytitanate that is used for lithium ion battery, concrete implementation steps are as follows:

[0038] Step 1, NH 4 TiOF 3 Preparation of:

[0039](1) Add 1.3g of ammonium fluoride to 10mL of deionized water, after the ammonium fluoride is completely dissolved, add 100mL of ethylene glycol and 3.25g of titanyl sulfate-sulfuric acid hydrate, and stir the mixture evenly to form a uniform solution;

[0040] (2) Transfer the uniformly stirred solution to a 200mL stainless steel autoclave, and react at 200°C for 70min;

[0041] (3) After cooling to room temperature, wash the product three times with deionized water, then dry the product in an oven at 60°C for 12 hours, and pass through a 300-mesh sieve to obtain NH 4 TiOF 3 (referred to as NTF-AP);

[0042] Step 2. Modified NH 4 TiOF 3 Preparation of:

[0043] The obtained NTF-AP was annealed with argon for 2 hours at 150° C. in a tube furnace, and take...

Embodiment 2

[0046] A kind of modified ammonium trifluorooxytitanate for lithium ion battery, concrete implementation steps are as follows:

[0047] Step 1, NH 4 TiOF 3 Preparation of:

[0048] (1) Add 1.3g of ammonium fluoride to 10mL of deionized water, after the ammonium fluoride is completely dissolved, add 100mL of ethylene glycol and 3.25g of titanyl sulfate-sulfuric acid hydrate, and stir the mixture evenly to form a uniform solution;

[0049] (2) Transfer the uniformly stirred solution to a 200mL stainless steel autoclave, and react at 200°C for 70min;

[0050] (3) After cooling to room temperature, wash the product three times with deionized water, then dry the product in an oven at 60°C for 12 hours, and pass through a 300-mesh sieve to obtain NH 4 TiOF 3 (referred to as NTF-AP);

[0051] Step 2. Modified NH 4 TiOF 3 Preparation of:

[0052] The obtained NTF-AP was annealed with argon for 2 hours at 250° C. in a tube furnace, and taken out after the furnace temperature wa...

Embodiment 3

[0055] A kind of modified ammonium trifluorooxytitanate for lithium ion battery, concrete implementation steps are as follows:

[0056] Step 1, NH 4 TiOF 3 Preparation of:

[0057] (1) Add 1.3g of ammonium fluoride to 10mL of deionized water, after the ammonium fluoride is completely dissolved, add 100mL of ethylene glycol and 3.25g of titanyl sulfate-sulfuric acid hydrate, and stir the mixture evenly to form a uniform solution;

[0058] (2) Transfer the uniformly stirred solution to a 200mL stainless steel autoclave, and react at 200°C for 70min;

[0059] (3) After cooling to room temperature, wash the product three times with deionized water, then dry the product in an oven at 60°C for 12 hours, and pass through a 300-mesh sieve to obtain NH 4 TiOF 3 (referred to as NTF-AP);

[0060] Step 2. Modified NH 4 TiOF 3 Preparation of:

[0061] The obtained NTF-AP was annealed with argon for 2 hours at 350° C. in a tube furnace, and taken out after the furnace temperature wa...

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Abstract

The invention discloses preparation and application of modified ammonium oxytrifluorotitanate for a lithium ion battery, and belongs to the technical field of preparation of new energy materials. Thepreparation method specifically comprises two steps of preparing an NH4TiOF3 anode material and modifying the NH4TiOF3 anode material. The TiO2 precursor -NH4TiOF3 prepared by the adopting method disclosed by the invention is in a uniform tablet shape, the diameter of secondary particles is 10 microns, and the thickness of the secondary particles is 1 micron. According to the modified NH4TiOF3 lithium ion battery prepared by adopting the method disclosed by the invention, a charge-discharge experiment is carried out in a voltage interval of 1-3V, the highest capacity can reach 182mAhg<-1>, andexcellent cycling stability is shown; when the current density is 1Ag<-1>, the reversible capacity of 128.6 mAhg<-1> can be maintained after circulation for 2000 circles; and the reversible capacityof 89.6 mAhg<-1> can be maintained under the high current density of 20Ag<-1>.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a TiO used for negative electrode materials of lithium-ion batteries 2 Precursor-NH 4 TiOF 3 Preparation, modification methods and applications. Background technique [0002] Due to its good cycle performance, high energy density and high safety, lithium-ion batteries are widely used in the field of portable electronic products, electric vehicles, hybrid vehicle batteries, etc., and the application prospects are very broad. . In lithium-ion batteries, the negative electrode material is a very important component and the key to determining the performance of lithium-ion batteries. where TiO 2 The base material has the advantages of low cost, environmental friendliness and small volume expansion coefficient, and the volume change is not obvious (<4%) during the charging and discharging process, which can effectively prevent the struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/0525
CPCH01M4/48H01M10/0525H01M2004/027Y02E60/10
Inventor 刘延国江楠孙宏宇王小亮王志远
Owner 东北大学秦皇岛分校
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