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Element-doped and double-layer-coated positive electrode material, preparation method thereof and lithium battery

A positive electrode material, double-layer coating technology, applied in the direction of lithium battery, positive electrode, battery electrode, etc., to achieve the effect of improving discharge capacity, easy mass production, and preventing dissolution

Active Publication Date: 2021-11-26
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the high-nickel NCMs and NCAs prepared mainly to provide chemical protection have failed to provide an effective solution to the strain accumulation

Method used

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  • Element-doped and double-layer-coated positive electrode material, preparation method thereof and lithium battery
  • Element-doped and double-layer-coated positive electrode material, preparation method thereof and lithium battery
  • Element-doped and double-layer-coated positive electrode material, preparation method thereof and lithium battery

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Effect test

Embodiment 1

[0065] This embodiment provides a method for preparing an element-doped and double-layer coated positive electrode material. The preparation method includes the following steps:

[0066] (1) Lithium carbonate and precursor Ni 0.9 co 0.05 mn 0.05 (OH) 2 Mix according to the molar ratio of Li / (Ni+Co+Mn) of 1:1, and then add dopants containing zirconia, tantalum pentoxide and boron oxide, wherein zirconia accounts for the total mass of lithium carbonate and precursor 500ppm, tantalum pentoxide accounts for 500ppm of the total mass of lithium carbonate and the precursor, and boron oxide accounts for 2000ppm of the total mass of lithium carbonate and the precursor; lithium carbonate, the precursor and the dopant are mixed for 30min at a speed of 1500rpm to obtain mixed materials;

[0067] (2) Transfer the mixed material to a box-type atmosphere furnace, raise the temperature to 730 ° C at a heating rate of 2 ° C / min under an oxygen atmosphere, and keep it for 15 hours to obta...

Embodiment 2

[0071] This embodiment provides a method for preparing an element-doped and double-layer coated positive electrode material. The preparation method includes the following steps:

[0072] (1) Lithium chloride and precursor Ni 0.9 co 0.05 mn 0.05 (OH) 2 Mix according to the molar ratio of Li / (Ni+Co+Mn) of 1:1.02, and then add dopants containing zirconium hydroxide, tantalum phosphate and boric acid, wherein zirconium hydroxide accounts for the total mass of lithium chloride and precursor 500ppm, tantalum phosphate accounts for 2000ppm of the total mass of lithium chloride and the precursor, and boric acid accounts for 500ppm of the total mass of lithium chloride and the precursor; lithium chloride, the precursor and the dopant are mixed at a speed of 1800rpm for 26min to obtain mixed materials;

[0073] (2) Transfer the mixed material to a box-type atmosphere furnace, raise the temperature to 750 °C at a heating rate of 2.6 °C / min under an oxygen atmosphere, and keep it for ...

Embodiment 3

[0077] This embodiment provides a method for preparing an element-doped and double-layer coated positive electrode material. The preparation method includes the following steps:

[0078] (1) Lithium hydroxide and precursor Ni 0.9 co 0.05 mn 0.05 (OH) 2 Mix according to the molar ratio of Li / (Ni+Co+Mn) of 1:1.04, then add dopants containing zirconium nitrate, tantalum chloride and boron oxide, wherein zirconium nitrate accounts for the total mass of lithium hydroxide and precursor 800ppm, tantalum chloride accounts for 500ppm of the total mass of lithium hydroxide and precursor, and boron oxide accounts for 500ppm of the total mass of lithium hydroxide and precursor; lithium hydroxide, precursor and dopant are mixed at a speed of 2100rpm for 22min , to get the mixed material;

[0079] (2) Transfer the mixed material to a box-type atmosphere furnace, raise the temperature to 780°C at a heating rate of 3.2°C / min under an oxygen atmosphere, and keep it for 10 hours to obtain a...

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Abstract

The invention provides an element-doped and double-layer-coated positive electrode material, a preparation method thereof and a lithium battery. The positive electrode material comprises positive electrode particles containing doping elements, and a zirconium-tantalum co-coating layer and a boron coating layer coating the surfaces of the positive electrode particles, and the doping elements contained in the positive electrode particles comprise zirconium, tantalum and boron. According to the positive electrode material provided by the invention, the microstructure of the secondary particles is changed through the combined action of doping and double-layer coating, so that the internal strain in a charging state is effectively eliminated, a single primary particle is uniformly shrunk and expanded in a circulating process, local strain accumulation and intergranular microcracks are minimized, the process is simple and easy to operate, and large-scale production is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to an element-doped and double-layer coated positive electrode material, a preparation method and a lithium battery. Background technique [0002] With the continuous development of society, the energy structure based on traditional fossil fuels such as oil and coal can no longer meet the needs of human society for energy, and it has also caused various environmental problems. create an urgent need. Rechargeable batteries can improve the utilization of resources, and as a new type of clean energy and energy storage devices have attracted widespread attention. Lithium-ion batteries were first developed by Sony Corporation of Japan in 1991 and have been developed rapidly so far. They are mainly used in electronic equipment such as mobile phones, computers, and cameras. At the same time, studies have shown that lithium-ion battery systems have incomparable advantages in the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/052H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/052H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 马加力张树涛李子郯江卫军王壮王亚州白艳康子鹏杨红新
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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