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Preparation method of TiO2-coated layered lithium-rich ternary cathode material

A cathode material and layered technology, applied in the field of preparation of layered lithium-rich ternary cathode materials, can solve the problems of low capacity and poor rate performance, and achieve the effects of good rate performance, inhibition of reaction and high crystallinity

Inactive Publication Date: 2015-12-23
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned technical problems such as low capacity and poor rate performance of the existing positive electrode materials, and to make up for the defects of the material through the coating method, improve the electrochemical performance of the material itself and provide a TiO 2 A preparation method of a coated layered lithium-rich ternary cathode material, the preparation method has the advantages of relatively simple process, low requirements for production equipment and excellent electrochemical performance of the prepared material

Method used

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  • Preparation method of TiO2-coated layered lithium-rich ternary cathode material
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  • Preparation method of TiO2-coated layered lithium-rich ternary cathode material

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Embodiment 1

[0034] TiO 2 The preparation method of the coated layered lithium-rich ternary positive electrode material, the prepared material contains Li, Ni, Co, Mn, Ti and O elements, and its molecular formula is Li 1.2 (Mn 0.54 Ni 0.13 co 0.13 )O 2 @TiO 2 , including the following steps:

[0035] (1) 6.3870g (excessive 1%) organic precipitant 8-hydroxyquinoline and 55ml organic solvent ethanol are mixed by organic precipitant: organic solvent is the ratio of 1mol:1L, then the control speed is 800r / min, temperature Solution A was obtained by stirring and dissolving at 80°C;

[0036] (2) With soluble 1.6190g cobalt salt, 1.6176g nickel salt, 6.61742g manganese salt and 6.4273g lithium salt and 50ml deionized water by the total molar weight of soluble cobalt salt, nickel salt, manganese salt and lithium salt: go Ionized water was mixed at a ratio of 1mol:1L, and solution B was obtained under ultrasonication for 20 minutes;

[0037] The amount of soluble cobalt salt, nickel salt, m...

Embodiment 2

[0058] TiO 2 The preparation method of the coated layered lithium-rich ternary positive electrode material, the prepared material contains Li, Ni, Co, Mn, Ti and O elements, and its molecular formula is Li 1.2 (Mn 0.54 Ni 0.13 co 0.13 )O 2 @TiO 2 , using an organic co-precipitation method, specifically comprising the following steps:

[0059] (1) Mix the organic precipitant 8-hydroxyquinoline with the organic solvent ethanol according to the ratio of organic precipitant: organic solvent is 0.5mol:1L, then control the rotating speed to be 800r / min, and stir and dissolve under the condition of 40°C to obtain Solution A;

[0060] (2) With soluble cobalt salt, nickel salt, manganese salt and lithium salt and deionized water, according to the total molar weight of soluble cobalt salt, nickel salt, manganese salt and lithium salt: deionized water is 0.5mol:1L Proportions were mixed to obtain solution B under ultrasonic 20min. The amount of soluble cobalt salt, nickel salt, ma...

Embodiment 3

[0065] TiO 2 The preparation method of the coated layered lithium-rich ternary positive electrode material, the prepared material contains Li, Ni, Co, Mn, Ti and O elements, and its molecular formula is Li 1.2 (Mn 0.54 Ni 0.13 co 0.13 )O 2 @TiO 2 , using an organic co-precipitation method, specifically comprising the following steps:

[0066] (1) Mix the organic precipitant 8-hydroxyquinoline with the organic solvent ethanol according to the ratio of organic precipitant: organic solvent is 2.5mol:1L, then control the rotation speed to be 500r / min, and stir and dissolve under the condition of 60°C to obtain Solution 1;

[0067] (2) With soluble cobalt salt, nickel salt, manganese salt and lithium salt and deionized water, according to the total molar weight of soluble cobalt salt, nickel salt, manganese salt and lithium salt: deionized water is 2.5mol:1L Proportions were mixed to obtain solution B under ultrasonic 20min. The amount of soluble cobalt salt, nickel salt, ma...

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Abstract

The invention relates to a preparation method of a TiO2-coated layered lithium-rich ternary cathode material. The molecular formula of the prepared lithium-rich ternary cathode material is Li1.2Mn0.54Ni0.13Co0.13O2@TiO2; and the preparation method is an organic coprecipitation method, and comprises the following steps: stirring an organic precipitant into an organic solvent in a constant-temperature water bath to obtain a solution A; dissolving soluble cobalt salt, nickel salt, manganese salt and lithium salt into deionized water to obtain a solution B; after completely dissolving, dropwise adding the solution B into the solution A at a constant speed, reacting and drying the solution, and stepwise heating and burning the obtained solid powder in a high-temperature tube furnace system; and putting the obtained material powder into a proper amount of organic solvent, adding a certain stoichiometric ratio of titanium-containing organic matter, and stirring, drying and burning the solvent, so as to obtain the TiO2-coated layered lithium-rich ternary cathode material. The TiO2-coated layered lithium-rich ternary cathode material is uniform in particles, is a regular polygon in topographic characteristics, has relatively good electrochemical properties, and is relatively simple in preparation technology and suitable for industrial mass production.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium ion batteries, and in particular relates to a TiO 2 A method for preparing a coated layered lithium-rich ternary cathode material. Background technique [0002] Since SONY manufactured the first lithium-ion battery in 1990, lithium-ion batteries have developed rapidly and replaced nickel-metal hydride batteries, and have been widely used in the fields of electronic equipment, energy storage and new energy vehicles. Nowadays, the improvement of the capacity and cycle performance of lithium-ion batteries is a problem that researchers from all over the world are eager to solve. [0003] At present, the common cathode materials for lithium-ion batteries mainly include: LiCoO 2 , LiNiO 2 , LiMn 2 o 4 、LiFePO 4 and LiNi x co y mn 1-x-y o 2 Wait. However, the above cathode materials have their own disadvantages: LiCoO 2 The structure is unstable...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M4/1391
CPCH01M4/1391H01M4/505H01M4/525H01M4/62Y02E60/10
Inventor 徐群杰袁小磊刘其刘新暖常幸萍闵宇霖
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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