Titanium-modified lithium-rich oxide cathode material as well as preparation method and application thereof

A cathode material and oxide technology, which is applied in the field of titanium-modified lithium-rich oxide cathode material and its preparation, can solve the problems of fast capacity decay, and achieve the effects of slow capacity decay, great commercialization prospects, and simple synthesis process.

Active Publication Date: 2020-11-17
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The titanium-modified lithium-rich oxide not only overcomes the shortcomings of traditional lithium-rich oxide materials such as fast capacity decay and poor cycle performance, but also has the advantages of high capacity, simple synthesis process, easy control, and good repeatability, and has a large commercial application. prospects

Method used

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  • Titanium-modified lithium-rich oxide cathode material as well as preparation method and application thereof
  • Titanium-modified lithium-rich oxide cathode material as well as preparation method and application thereof
  • Titanium-modified lithium-rich oxide cathode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] An embodiment of the titanium-modified lithium-rich oxide cathode material of the present invention, the chemical formula of the titanium-modified lithium-rich oxide cathode material is 0.2Li 2 MnO 3 -0.8LiMn 0.5 Ni 0.45 Ti 0.05 o 2 , the preparation method of the titanium-modified lithium-rich oxide cathode material comprises the following steps:

[0028] (1) 0.96g transition metal carbonate microsphere precursor (Mn 0.75 Ni 0.25 CO 3 ) and 1.4414g of urea, add 18μL tetrabutyl titanate, add 40ml of absolute ethanol, put it into a 100ml reactor and stir thoroughly, heat-treat in an oven at 150°C for 12h, cool in the furnace, and filter to obtain a powder;

[0029] (2) Add 0.4655g Lithium Carbonate, 1.8701g NaCl and 3.5784g KCl to the powder obtained in step (1), and after fully grinding, react in a box furnace at 850°C for 12h to complete the heat treatment, and cool with the furnace; The final sample was washed and dried to obtain 0.2Li 2 MnO 3 -0.8LiMn 0.5 ...

Embodiment 2

[0033] An embodiment of the titanium-modified lithium-rich oxide cathode material of the present invention, the chemical formula of the titanium-modified lithium-rich oxide cathode material is 0.2Li 2 MnO 3 -0.8LiMn 0.5 Ni 0.45 Ti 0.05 o 2 , the preparation method of the titanium-modified lithium-rich oxide cathode material comprises the following steps:

[0034] (1) 0.96g transition metal carbonate microsphere precursor (Mn 0.75 Ni 0.25 CO 3 ) and 1.4414g of urea, add 18μL of tetraethyl titanate, add 40ml of absolute ethanol, put it into a 100ml reactor and stir thoroughly, then heat-treat in an oven at 100°C for 12h, cool in the furnace, and filter to obtain a powder;

[0035] (2) Add 0.4655g Lithium Carbonate, 1.8701g NaCl and 3.5784g KCl to the powder obtained in step (1), and after fully grinding, react in a box furnace at 850°C for 12h to complete the heat treatment, and cool with the furnace; The final sample was washed and dried to obtain 0.2Li 2 MnO 3 -0.8Li...

Embodiment 3

[0038] An embodiment of the titanium-modified lithium-rich oxide cathode material of the present invention, the chemical formula of the titanium-modified lithium-rich oxide cathode material is 0.2Li 2 MnO 3 -0.8LiMn 0.5 Ni 0.45 Ti 0.05 o 2 , the preparation method of the titanium-modified lithium-rich oxide cathode material comprises the following steps:

[0039] (1) 0.96g transition metal carbonate microsphere precursor (Mn 0.75 Ni 0.25 CO 3 ) and 1.4414g of urea, add 18μL of tetraisopropyl titanate, add 40ml of absolute ethanol, put it into a 100ml reaction kettle and stir thoroughly, then heat-treat in an oven at 180°C for 12h, cool in the furnace, and filter to obtain a powder ;

[0040] (2) Add 0.4655g Lithium Carbonate, 1.8701g NaCl and 3.5784g KCl to the powder obtained in step (1), and after fully grinding, react in a box furnace at 850°C for 12h to complete the heat treatment, and cool with the furnace; The final sample was washed and dried to obtain 0.2Li 2...

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Abstract

The invention provides a titanium-modified lithium-rich oxide cathode material, the chemical formula of the titanium-modified lithium-rich oxide cathode material is xLi2MnO3- (1-x) Li < 1 + y > TM<1-y-z> TizO2, TM is at least one of Mn, Ni and Co, x is more than or equal to 0.01 and less than or equal to 0.5, y is more than or equal to 0.01 and less than or equal to 0.3, and z is more than 0 and less than or equal to 0.1. The titanium-modified lithium-rich oxide positive electrode material is relatively high in initial coulombic efficiency, relatively high in capacity and excellent in cycle performance. When the voltage window is 2-4.8 V and the current density is 200 mA/g, the specific capacity can reach 235 mAh/g, and the capacity retention ratio after 500 cycles can reach 90%.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and more specifically relates to a titanium-modified lithium-rich oxide positive electrode material and a preparation method and application thereof. Background technique [0002] Due to the advantages of high voltage, large specific energy, long cycle life, small self-discharge, and good safety performance, lithium-ion batteries have been widely used in electronic products, transportation, aerospace, and energy storage devices. At present, high-capacity cathode materials are the key to realizing high-energy-density lithium-ion batteries, and lithium-rich oxides have become the most potential candidate cathode materials for next-generation lithium-ion batteries because of their high specific capacity and high energy density. However, the traditional lithium-rich oxide materials suffer from the disadvantages of low initial Coulombic efficiency and fast capacity and voltage decay, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/0525C01G53/00C01G45/12
CPCH01M4/505H01M4/525H01M4/485H01M10/0525C01G53/006C01G45/125C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 罗冬林展崔佳祥谢惠娴丁晓凯张祖豪张博阳黄文钊
Owner GUANGDONG UNIV OF TECH
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