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Preparation method of spherical layer-structured anode material externally coated with nanocrystalline metal oxide for lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, which is applied to battery electrodes, secondary batteries, structural parts, etc., can solve the problems of uneven coating layer distribution, cumbersome process, and cumbersome process, and achieve good product consistency. The effect of simple process flow and uniform particle size distribution

Inactive Publication Date: 2014-11-05
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, the coating is mainly realized by dry ball milling, but this process is not only cumbersome, but also the distribution of the coating layer is not uniform
There are also spray methods, chemical vapor deposition methods, etc. to achieve coating, and the same process is mostly cumbersome

Method used

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  • Preparation method of spherical layer-structured anode material externally coated with nanocrystalline metal oxide for lithium ion battery
  • Preparation method of spherical layer-structured anode material externally coated with nanocrystalline metal oxide for lithium ion battery
  • Preparation method of spherical layer-structured anode material externally coated with nanocrystalline metal oxide for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 LiCoO coated with 2.0%wt. nanometer titanium dioxide on the surface 2

[0041] Use a little pure water as the bottom liquid, heat the temperature to 40°C, and adjust the rotation speed of the stirrer to 100r / min. Cobalt sulfate solution (0.25mol / L) and Na 2 CO 3 +NH 4 HCO 3 The solution (0.5mol / L) was slowly added dropwise to the continuously stirred reactor, and the pH value of the solution was controlled to be 8.0. A spherical cobalt carbonate precursor is obtained after aging the precipitate, filtering, washing and drying.

[0042] The spherical cobalt carbonate precursor is uniformly ball-milled with lithium hydroxide, calcined at 500°C for 6 hours, ground, pressed into tablets, and then calcined at 800°C for 20 hours to obtain a spherical lithium cobaltate positive electrode material.

[0043] Disperse the prepared spherical lithium cobaltate positive electrode material and stoichiometric nano-titanium dioxide in an appropriate amount of ethanol, an...

Embodiment 2

[0044] Example 2 Li(Ni 0.5 mn 0.5 )O 2

[0045]Use a little pure water as the bottom liquid, heat the temperature to 50°C, and adjust the speed of the stirrer to 150r / min. Nickel acetate, manganese acetate mixed salt solution (0.5mol / L) and Na 2 CO 3 +NH 4 HCO 3 The solution (1.0mol / L) was slowly added dropwise to the continuously stirred reactor, and the pH value of the solution was controlled to be 8.5. A spherical nickel-manganese carbonate precursor is obtained after the precipitate is aged, filtered, washed and dried.

[0046] The spherical nickel-manganese carbonate precursor is uniformly ball-milled with lithium carbonate, calcined at 500°C for 6 hours, ground, pressed into tablets, and then calcined at 900°C for 15 hours to obtain a spherical nickel-manganese binary positive electrode material.

[0047] Disperse the prepared spherical nickel-manganese binary positive electrode material and stoichiometric nano-titanium dioxide in an appropriate amount of deioniz...

Embodiment 3

[0049] Example 3 Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2

[0050] Use a little pure water as the bottom liquid, heat the temperature to 60°C, and adjust the rotation speed of the stirrer to 200r / min. Mix nickel sulfate, cobalt sulfate, manganese sulfate mixed salt solution (1.0mol / L) with Na 2 CO 3 +NH 4 HCO 3 The solution (2.0mol / L) was slowly added dropwise into the continuously stirred reactor, and the pH value of the solution was controlled to be 9.0. A spherical nickel-cobalt-manganese carbonate precursor is obtained after the precipitate is aged, filtered, washed and dried.

[0051] The spherical nickel-cobalt-manganese carbonate precursor is uniformly ball-milled with lithium acetate, calcined at 500°C for 6 hours, ground, pressed into tablets, and then calcined at 950°C for 12 hours to obtain a spherical nickel-cobalt-manganese ternary positive electrode material.

[0052] Disperse the prepared spherical nickel-cobalt-manganese ternary positive electrode material and sto...

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Abstract

The invention belongs to the field of a lithium ion battery material, in particular relates to a preparation method of a spherical layer-structured anode material externally coated with a nanocrystalline metal oxide for a lithium ion battery. The layer-structured anode material has the following chemical formula: LiNixMnYCo<1-x-y)O2, wherein x is more than or equal to zero and less than or equal to 0.5, y is more than or equal to 0 and less than or equal to 0.5. The preparation method has the key points of: preparing the spherical layer-structured anode material by a coprecipitation method of carbonate; mixing a small amount of nanocrystalline metal oxide powder at a wet state, and stirring until a solvent is completely volatilized; and calcining a mixed material again, and obtaining the spherical layered material coated with the nanocrystalline metal oxide. The coating process is simple, the distribution of a coating layer is more uniform, product consistence is good, the prepared material is spherical particles with uniform grain sizes and has high tap density and volume energy density, and the cycle performance at high voltage, the high-temperature cycle performance and rate capability are enhanced and improved to some extent.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a preparation method and a production process of a spherical layered positive electrode material coated with nanometer metal oxides. Background technique [0002] The development of new cathode materials with high capacity, low cost, long life and environmental friendliness has become the mainstream research direction of lithium ion battery materials. Layered positive electrode materials, especially lithium cobaltate and nickel-cobalt-manganese ternary materials (including 333-type, 532-type, 442-type, and lithium-rich ternary materials) are the most commonly used materials in lithium-ion batteries. However, the cycle performance and rate performance of layered materials under high voltage still need to be improved. [0003] Surface coating is a new technology to improve the electrochemical performance of lithium-ion battery cathode materials in recent ye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张海朗宋腾飞
Owner JIANGNAN UNIV
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