Doped and coated dual-modified lithium/sodium layered metal oxide positive electrode material and one-step synthesis method therefor

A technology of cathode materials and layered metals, applied in the field of lithium/sodium layered metal oxide cathode materials and their one-step synthesis, can solve the problems of low ion diffusion coefficient, poor rate performance, poor thermal stability, etc., and achieve the process method Simple, simple operation, simple process effect

Active Publication Date: 2017-11-21
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(1) The structural stability of the material is poor
(2) The thermal stability of the material is poor
(3) The ion diffusion coefficient of the material is low and the rate performance is poor

Method used

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  • Doped and coated dual-modified lithium/sodium layered metal oxide positive electrode material and one-step synthesis method therefor
  • Doped and coated dual-modified lithium/sodium layered metal oxide positive electrode material and one-step synthesis method therefor
  • Doped and coated dual-modified lithium/sodium layered metal oxide positive electrode material and one-step synthesis method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Measure 60mL of absolute ethanol and place it in a 200mL beaker, then add 0.0003mol of tetrabutyl titanate and 0.00015mol of lanthanum acetate into the above solution, and transfer the above solution to a 60°C water bath , stirred at a stirring speed of 400rmp until fully dissolved, weighed 0.0324mol of lithium hydroxide (excessive 8% lithium) was added to the solution and stirred until a sol was formed, weighed 0.03mol of Ni 0.8 co 0.1 mn 0.1 (OH) 2 The precursor was stirred and moved into a blast drying oven, and dried at 120°C for 24 hours. The obtained powder was placed in an agate mortar and ground evenly, then placed in a corundum porcelain boat, and the corundum porcelain boat was transferred to a tube furnace. Calcined at 480°C for 5h and 830°C for 12h under an oxygen atmosphere to obtain titanium doped with 1%, La 4 NiLiO 8 LiNi with an interface coating of 0.125% 0.8 co 0.1 mn 0.1 o 2 Cathode material.

[0034] By XRD analysis (such as figure 1 shown...

Embodiment 2

[0036] Measure 60mL of absolute ethanol and place it in a 200mL beaker, then add 0.0009mol of tetrabutyl titanate and 0.00015mol of lanthanum acetate into the above solution, and transfer the above solution to a 60°C water bath , stirred at a stirring speed of 400rmp until fully dissolved, weighed 0.0324mol of lithium hydroxide (excessive 8% lithium) was added to the solution and stirred until a sol was formed, weighed 0.03mol of Ni 0.8 co 0.1 mn 0.1 (OH) 2 The precursor was stirred and moved into a blast drying oven, and dried at 120°C for 24 hours. The obtained powder was placed in an agate mortar and ground evenly, then placed in a corundum porcelain boat, and the corundum porcelain boat was transferred to a tube furnace. Calcined at 480°C for 5h and 830°C for 12h under an oxygen atmosphere to obtain titanium doped with 3%, La 4 NiLiO 8 LiNi with an interface coating of 0.125% 0.8 co 0.1 mn 0.1 o 2 Cathode material.

[0037] By XRD analysis, it was observed that th...

Embodiment 3

[0039] Measure 60 mL of absolute ethanol and put it in a 200 mL beaker, then add 0.003 mol of tetrabutyl titanate and 0.0015 mol of lanthanum acetate into the above solution, transfer the above solution to a 60°C water bath, Stir at a stirring speed until completely dissolved, weigh 0.0324mol of lithium hydroxide (8% excess lithium) into the solution and stir until a sol is formed, weigh 0.03mol of Ni 0.8 co 0.1 mn 0.1 (OH) 2 The precursor was stirred and moved into a blast drying oven, and dried at 120°C for 24 hours. The obtained powder was placed in an agate mortar and ground evenly, then placed in a corundum porcelain boat, and the corundum porcelain boat was transferred to a tube furnace. Calcined at 480°C for 5h and 830°C for 12h in an oxygen atmosphere to obtain titanium doped with 10%, La 4 NiLiO 8 The interface coating amount is 1.25% modified LiNi 0.8 co 0.1 mn 0.1 o 2 Cathode material.

[0040] By XRD analysis, it was observed that the layered structure of ...

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Abstract

The invention discloses a doped and coated dual-modified lithium / sodium layered metal oxide positive electrode material and a one-step synthesis method therefor. The ion-doped and interface-coated lithium / sodium layered metal oxide positive electrode material is synthesized by adopting a solvent-thermal treatment process / solid-phase ball milling process, wherein the doped ions are one or more than one kinds of F<->, Mg<2+>, Cu<2+>, Zn<2+>, Al<3+>, Fe<3+>, Cr<3+>, Ti<4+>, Zr<4+>, Mo<4+>, Sb<5+> and V<5+>; and the interface coating material is an ion compound which comprises lanthanide series or actinium series ions with radiuses greater than or equal to 1.016<angstrom>. By abandoning the idea that an ion-doped positive electrode material sample is prepared firstly and then interface coating is performed in the conventional process, the new method for the doped and coated dual-modified lithium / sodium layered metal oxide positive electrode material is developed through one-step synthesis, and the new method has the characteristic of simple process; and in addition, the electrochemical performance of the dual-modified positive electrode material is greatly improved, so that the positive electrode material can be used for a power battery and an energy storage secondary battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a lithium / sodium layered metal oxide cathode material which is both doped and interface-coated and a one-step synthesis method thereof. Background technique [0002] With the depletion of non-renewable resources in the world, the energy crisis has emerged. At the same time, problems such as environmental pollution and ecological damage caused by the development and utilization of fossil energy are becoming more and more prominent. The above problems pose challenges to human survival and economic development. Therefore, it is urgent to find alternative energy sources and develop efficient energy storage technologies. On the one hand, people save energy and reduce emissions, vigorously develop electric vehicles and hybrid electric vehicles, and on the other hand actively develop new renewable energy sources, such as wind energy, solar energy, geothermal energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李灵均杨慧平姚琦陈杰夏凌峰
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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