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A preparation method of composite-coated lithium titanate negative electrode material

A technology of coating lithium titanate and negative electrode materials, which is applied in the field of preparation of composite coated lithium titanate negative electrode materials, can solve the problems of increased electrode/electrolyte interface impedance, affecting the application of lithium titanate, and shortening battery life. Achieves the effect of improving the rate and cycle performance, facilitating the test, and suppressing water absorption

Active Publication Date: 2020-06-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Lithium titanate negative electrode material is easy to produce gas during the battery manufacturing process, which increases the electrode / electrolyte interface impedance, rapidly decays cycle performance, and shortens battery life, which greatly affects the application of lithium titanate

Method used

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  • A preparation method of composite-coated lithium titanate negative electrode material
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  • A preparation method of composite-coated lithium titanate negative electrode material

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Effect test

Embodiment 1

[0023] Zn 2 Te 3 o 8 0.5TiTe 3 o 8 The preparation of composite coated lithium titanate negative electrode material comprises the following steps:

[0024] (1) Preparation of pure-phase lithium titanate precursor: according to Li:Ti stoichiometric ratio of 4.1:5, accurately weigh lithium hydroxide and tetraisopropyl titanate, and add them to 5wt% citric acid absolute ethanol solution (the amount of citric acid added is 5% of the mass of theoretically synthesized pure-phase lithium titanate), and ultrasonic treatment was carried out for 1.6h, and then reacted at 80°C under stirring and reflux for 6h to form a gel, and the gel was heated at 110°C drying to form a xerogel; pre-calcining the xerogel at 500°C for 3 hours in an air atmosphere to obtain a pure-phase lithium titanate precursor;

[0025] (2) Press Zn 2 Te 3 o 8 : TiTe 3 o 8 =1:0.5 mass ratio to weigh Zn 2 Te 3 o 8 、TiTe 3 o 8 , mixed to form Zn 2 Te 3 o 8 0.5TiTe 3 o 8 Mixture, weigh Zn according to...

Embodiment 2

[0028] Zn 2 Te 3 o 8 0.1TiTe 3 o 8 The preparation of composite coated lithium titanate negative electrode material comprises the following steps:

[0029] (1) Preparation of the pure-phase lithium titanate precursor: according to the Li:Ti stoichiometric ratio of 4.05:5, accurately weigh lithium acetate and tetraethyl titanate, and add them to 2wt% citric acid absolute ethanol solution ( The amount of citric acid added is 3% of the mass of theoretically synthesized pure-phase lithium titanate), and ultrasonic treatment is carried out for 1.2h, and then reacted at 90°C under stirring and reflux for 4h to form a gel, which is dried at 105°C to form Dry gel; pre-calcine the dry gel at 450°C for 4 hours in an air atmosphere to obtain a pure-phase lithium titanate precursor;

[0030] (2) Press Zn 2 Te 3 o 8 : TiTe 3 o 8 =1:0.1 mass ratio to weigh Zn 2 Te 3 o 8 、TiTe 3 o 8 , mixed to form Zn 2 Te 3 o 8 0.1TiTe 3 o 8 Mixture, weigh Zn according to 3% of the mass ...

Embodiment 3

[0033] Zn 2 Te 3 o 8 0.3TiTe 3 o 8 The preparation of composite coated lithium titanate negative electrode material comprises the following steps:

[0034] (1) Preparation of pure-phase lithium titanate precursor: according to the Li:Ti stoichiometric ratio of 4.1:5, accurately weigh lithium nitrate and tetraisopropyl titanate, and add them to 3wt% citric acid absolute ethanol solution (The amount of citric acid added is 4% of the mass of theoretically synthesized pure-phase lithium titanate), and ultrasonic treatment was carried out for 1.5h, and then reacted at 70°C under stirring and reflux for 5h to form a gel, which was dried at 110°C Forming a xerogel; pre-calcining the xerogel at 500°C for 4.5 hours in an air atmosphere to obtain a pure-phase lithium titanate precursor;

[0035] (2)(2) Press Zn 2 Te 3 o 8 : TiTe 3 o 8 =1:0.3 mass ratio to weigh Zn 2 Te 3 o 8 、TiTe 3 o 8 , mixed to form Zn 2 Te 3 o 8 0.3TiTe 3 o 8 Mixture, weigh Zn according to 5% of ...

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Abstract

A method for preparing a lithium titanate anode material coated with a composite is disclosed. The lithium titanate anode material is coated with the composite that is Zn2Te3O8.xTiTe3O8 (with the x being 0-1). The method includes preparing a pure-phase lithium titanate precursor by adopting a sol-gel process, subjecting the precursor and a Zn2Te3O8.xTiTe3O8 mixture in a certain ratio to solid-phase grinding, and performing calcination in an air atmosphere to obtain the lithium titanate anode material coated with the composite that is the Zn2Te3O8.xTiTe3O8. In the anode material, the lithium titanate is evenly coated with the Zn2Te3O8.xTiTe3O8, and therefore growth of lithium titanate particles is inhibited, the pH value of the anode material is reduced, and a Zn2Te3O8.xTiTe3O8 surface coating is good in chemical stability, structure stability of the lithium titanate is effectively maintained in repeated charging and discharging processes, and the rate and cyclic performance of the lithium titanate are increased. In addition, a whole preparing process is simple and easy to test. The method has a wide application prospect.

Description

technical field [0001] The invention belongs to the fields of new materials and energy, and relates to a lithium ion battery negative electrode material, in particular to a preparation method of a compound-coated lithium titanate negative electrode material. Background technique [0002] Traditional anode materials are mainly carbon materials. Carbon materials have the advantages of good cycle stability and low charge-discharge platform, but there are also some disadvantages, such as the potential safety hazard of lithium dendrite precipitation, and the speed of energy release is not fast enough, so it is not suitable for Equipment that requires instantaneous high current, etc. Compared with carbon materials, lithium titanate (Li 4 Ti 5 o 12 ) has obvious advantages, such as almost "zero volume change" during charging and discharging, good cycle performance, high Coulombic efficiency, and no reaction with electrolyte, etc., and has become a hot research topic at home and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/485H01M4/62H01M10/0525Y02E60/10
Inventor 刘兴亮杨茂萍李道聪沈中宇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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