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Positive electrode material, battery and preparation method of positive electrode material thereof

A technology for positive electrode materials and composite positive electrode materials, which is applied in the field of preparation of lithium nickel cobalt oxide positive electrode materials, can solve problems such as poor cycle stability, achieve long service life, improve cycle stability and safety, and suppress side reactions.

Inactive Publication Date: 2018-12-11
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the above defects, to provide a positive electrode material, a battery and a method for preparing the positive electrode material, so as to solve the problem of poor cycle stability of lithium nickel cobalt oxide batteries in the prior art, and achieve the effect of improving cycle stability

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  • Positive electrode material, battery and preparation method of positive electrode material thereof
  • Positive electrode material, battery and preparation method of positive electrode material thereof

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preparation example Construction

[0032] In an optional embodiment, the present invention provides a lithium nickel cobalt oxide composite positive electrode material and a preparation method thereof, in which a layer of tungsten-containing compound positive electrode material is coated on the surface of the lithium nickel cobalt oxide to improve the stability of the single battery during use. Rate performance and cycle life, the tungsten-containing compound on the outermost layer isolates the metal nickel from direct contact with the electrolyte, which can effectively improve the stability and safety of the battery; the preparation method is simple and easy to implement.

[0033] In an optional example, the preparation method of a lithium nickel cobalt oxide composite positive electrode material of the present invention may include the following steps:

[0034] Step 1), dissolving tungsten-containing compound in water to prepare A solution (for example: tungsten-containing compound solution), 0.05-2.5mol / L in ...

Embodiment 1

[0045] 1.65kg lithium nickel cobalt oxide precursor Ni 0.8 co 0.2 (OH) 2 Add to the reaction kettle with 1mol / L ammonium metatungstate solution, stir constantly, the stirring speed is 500rpm, add 0.5mol / L sodium hydroxide and ammonia water mixed solution to the reaction kettle at 25mL / min, by mole The ratio of ammonia water to sodium hydroxide is 1:25. After adding the precipitant, let it stand for 1 hour after the precipitation is complete, filter and collect the solid, wash the solid with deionized water and dry it. Then the dried solid and lithium hydroxide were mixed and ground in a grinder for 60 minutes, and mixed at a molar ratio of 1:1, and then calcined at 800°C for 15 hours at a high temperature, cooled to room temperature, crushed and sieved to obtain a surface coating containing A nickel-cobalt-aluminum-lithium composite positive electrode material with a tungsten compound layer.

Embodiment 2

[0047] 1.23kg lithium nickel cobalt oxide precursor Ni 0.8 co 0.2 (OH) 2 Add 0.8mol / L ammonium tungstate solution to the reaction kettle, stir continuously, the stirring speed is 500rpm, add 0.6mol / L sodium hydroxide and ammonia water mixed solution to the reaction kettle at 30mL / min, the ammonia water is calculated by mole The ratio of sodium hydroxide to sodium hydroxide is 1:25. After adding the precipitant, let it stand for 1 hour after the precipitation is complete, filter and collect the solid, wash the solid with deionized water and dry it. Then mix and grind the dried solid and lithium hydroxide in a grinder for 60 minutes, mix at a molar ratio of 1:1, and then roast at 1000°C for 15 hours at high temperature, cool to room temperature, grind and sieve to obtain surface coating A nickel-cobalt-aluminum-lithium composite cathode material containing a tungsten compound layer.

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Abstract

The invention discloses a positive electrode material, a battery and a preparation method of the positive electrode material. The positive electrode material comprises a lithium nickel cobalt oxide layer (1) and a tungsten-containing compound layer (2). Wherein the tungsten-containing compound layer (2) is coated on the surface of the lithium nickel cobalt oxide layer (1) to form a lithium nickelcobalt oxide composite positive electrode material. The scheme of the invention can overcome the defects of poor circulation stability, poor safety, short service life and the like in the prior art, and realize the beneficial effects of good circulation stability, good safety and long service life.

Description

technical field [0001] The invention belongs to the technical field of batteries, especially the technical field of lithium batteries; in particular, it relates to a positive electrode material, a battery and a method for preparing the positive electrode material thereof, in particular to a tungsten-coated lithium nickel cobalt oxide positive electrode material with the lithium nickel cobalt oxide A lithium nickel cobalt oxide battery of the positive electrode material, and a preparation method of the lithium nickel cobalt oxide positive electrode material of the lithium nickel cobalt oxide battery. Background technique [0002] Lithium-ion batteries have become a hot spot in the research of new power supply technology due to their high specific energy, long cycle life, no memory effect, safety and reliability, and fast charging and discharging. At present, they have been widely used in portable electronic products and new energy electric vehicles. superior. This requires l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 荆聪莹詹世英马美品李海军蔡惠群
Owner YINLONG ENERGY CO LTD
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