Positive electrode material for lithium battery, preparation method and application thereof

A positive electrode material and lithium battery technology, applied in battery electrodes, secondary battery manufacturing, batteries, etc., can solve problems affecting battery cycle performance and safety performance, low discharge voltage and volume density, hindering the movement of lithium ions on the surface, etc., to achieve Good structural stability and cycle stability, improved stability and less side effects

CN110085814BActive Publication Date: 2021-07-20SVOLT ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-07-20

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Abstract

The invention provides a cathode material for a lithium battery, a preparation method and application thereof. The anode material for a lithium battery according to the present invention includes a lithium metal composite oxide having a layered structure and a boron coating layer formed on the surface of the lithium metal composite oxide, wherein the lithium metal composite oxide includes Li, Ni and doping element M1, said doping element M1 is at least one selected from Zr, Mg, Al, Ni, Mn, Zn, Fe, Cr, Mo and W, said Ni and said doping element The molar ratio of the sum of M1 to the Li is less than 1, and the boron coating layer includes boron and / or boride. The positive electrode material for the lithium battery has good structural stability, stable electrochemical performance, and is not easy to react with the electrolyte.
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Description

technical field

[0001] The invention relates to the technical field of lithium batteries, in particular to a positive electrode material for lithium batteries and a preparation method and application thereof. Background technique

[0002] At present, the new energy industry is developing rapidly. As an important part of the new energy industry, new energy vehicles have put forward higher requirements for the stability and safety of batteries. As the core of new energy vehicles, power batteries will directly determine the performance of new energy vehicles. In order to meet the needs of new energy vehicles for mileage and cost performance, researchers generally use high-nickel cathode materials to replace traditional LiCoO 2 Material. Lithium-nickel oxides are not only cheaper than cobalt oxides, but also have a higher discharge capacity when charged at 4.3V, and the reversible capacity of doped lithium-nickel oxides exceeds that of LiCoO 2 The capacity (165mAh / g) is about ...

Examples

Embodiment 1

[0045] The positive electrode material for lithium batteries has a lithium metal composite oxide with a layered structure and a boron coating layer formed on the surface of the lithium metal composite oxide, wherein the chemical formula of the lithium metal composite oxide is Li 1.02 m e M1 0.015 o 2 , where M e The chemical formula is Ni 0.8 co 0.1 mn 0.085 , M1 is Zr; the doping amount of the doping element is 3wt‰ of the positive electrode material, the content of the boron coating layer is 1.5wt‰ of the positive electrode material, and the a-axis lattice parameter of the lithium metal composite oxide is not low At The c-axis lattice parameter is not less than

[0046] The method for preparing the positive electrode material for the lithium battery is as follows: (1) using the doping element M1 to dope the metal oxide containing Li and Ni to obtain a lithium metal composite oxide; (2) adding H 3 BO 3 The fine powder is mixed with the lithium metal composite oxid...

Embodiment 2

[0048] The positive electrode material for lithium batteries has a lithium metal composite oxide with a layered structure and a boron coating layer formed on the surface of the lithium metal composite oxide, wherein the chemical formula of the lithium metal composite oxide is Li 1.02 m e M1 0.015 o 2 , where M e The chemical formula is Ni 0.8 co 0.1 mn 0.085 , M1 is Zr; the doping amount of the doping element is 3wt‰ of the positive electrode material, the content of the boron coating layer is 1.5wt‰ of the positive electrode material, and the a-axis lattice parameter of the lithium metal composite oxide is not low At The c-axis lattice parameter is not less than

[0049] The method for preparing the positive electrode material for the lithium battery is as follows: (1) using the doping element M1 to dope the metal oxide containing Li and Ni to obtain a lithium metal composite oxide; (2) adding H 3 BO 3 Dissolved in ultrapure water, and then added lithium metal com...