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Nickel cobalt lithium aluminate positive electrode material and its preparation method and application

A positive electrode material, nickel-cobalt-aluminum technology, applied in the field of lithium-ion battery positive electrode materials and its preparation, can solve the problems of unsatisfactory electrochemical performance of lithium batteries, achieve excellent electrochemical performance, low free lithium content, and controllable morphology Effect

Active Publication Date: 2019-03-15
湖南金富力新能源股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The problem of the prior art that the present invention solves is: the electrochemical performance of the lithium battery prepared by the nickel-cobalt-aluminum-aluminate positive electrode material obtained by the existing method for preparing the positive electrode material of the nickel-cobalt-aluminum-lithium battery is not ideal, how to obtain the lithium battery from the basic material It is a technical problem today to make full use of new technologies to prepare uniform cathode materials and improve the electrochemical performance of materials

Method used

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  • Nickel cobalt lithium aluminate positive electrode material and its preparation method and application
  • Nickel cobalt lithium aluminate positive electrode material and its preparation method and application
  • Nickel cobalt lithium aluminate positive electrode material and its preparation method and application

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preparation example Construction

[0045] The preparation method of preferred nickel cobalt lithium aluminate cathode material of the present invention, comprises the steps:

[0046] a) Mixing (physical dispersion), that is, lithium salts, nickel-cobalt-aluminum precursors, target dopant element raw materials, etc. are prepared by wet, dry or quasi-dry methods to prepare fluffy powder materials or materials that are slightly agglomerated locally . The lithium salt is composed of lithium carbonate, lithium hydroxide monohydrate, lithium acetate and / or lithium oxalate and the like.

[0047] b). First pulverization at high temperature (physical-chemical dispersion). The material obtained in step a) is introduced into a high-temperature pulverizer for further dispersion and pulverization to form a powdery material with uniform composition, while some raw materials undergo thermal decomposition reactions. High-temperature pulverizer refers to a pulverizer that uses high-temperature and high-pressure steam as the ai...

Embodiment 1

[0058] Embodiment 1 (comparative example)

[0059] Material mixing: use 1000L plow mixer. Turn on the stirring (rotating speed 25rpm), add 634.8kg of nickel-cobalt-manganese precursor (Ni 0.82 co 0.17 al 0.01 (OH) 2 (grain size D v50 : 7 μm, effective substance content 99.5%), then take by weighing 252.3kg lithium hydroxide monohydrate powder (particle size D v50 : 25 μm, active substance content 99.8%) join in the mixer, add 222.0kg deionized water according to 80wt% solid content under stirring situation, further reduce the speed (5rpm) after stirring 2h, stir 6h and discharge the material to form the Paste materials are sealed for later use.

[0060] Primary sintering: use ventilated 24m roller kiln. Set the temperature in the heating zone to 400°C, under the condition of introducing oxygen-enriched air (oxygen-enriched air with an oxygen content of 45%, and a flow rate of 400m 3 / h) Put the material into the ceramic bowl for the first sintering, and sintering for 1...

Embodiment 2

[0065] Embodiment 2 (comparative example)

[0066] Material mixing: use 1000LY mixer. Turn on stirring (speed 50rpm), add 317.4kg of nickel-cobalt-manganese precursor (Ni 0.82 co 0.17 al 0.01 (OH) 2 (grain size D v50 : 7 μm, effective matter content 99.5%), then take by weighing 252.3kg lithium hydroxide monohydrate powder (particle size D v50 : 25 μm, active substance content 99.8%) join in the mixer, add 142.0kg deionized water by 80% solid content under stirring situation, and 0.56kg magnesium oxide (industrial grade, particle size D v50 0.5 μ m, purity 99.5%, content is 1000ppm in terms of finished product magnesium content), 0.83kg zirconium nitrate pentahydrate (industrial grade, purity 95%, content is 500ppm in terms of finished product zirconium content), after stirring 2h, further reduce speed (3 -5rpm) Stir for 1h and discharge to form a paste-like material with a certain degree of molding, discharge and seal for later use.

[0067] Primary sintering: the same...

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Abstract

The invention relates to a nickel cobalt lithium aluminate positive electrode material as well as a preparation method and application thereof. The positive electrode material has a chemical formula of LixNiaCobAlcMdO2, wherein x is greater than or equal to 0.95 but smaller than or equal to 1.06; a is greater than or equal to 0.80 but smaller than or equal to 0.82; b is greater than or equal to 0.09 but smaller than or equal to 0.17; c is greater than or equal to 0.01 but smaller than or equal to 0.06; d is greater than or equal to 0 but smaller than or equal to 0.03; the sum of the a, the b and the c is 1.0 to 1.03; M is a doping element; the content of free lithium ions in the positive electrode material is lower than 0.1 weight percent of the positive electrode material. The positive electrode material is prepared through work procedures of mixing raw materials containing nickel cobalt aluminum precursors and lithium salts, performing high-temperature crushing at 300 to 400 DEG C and performing sintering, crushing and the like. The preparation process has the advantages that the material selection is wide; the production intensity is high; the physical diffusion is uniform, and the like. The preparation process can be widely used in positive electrode material production. The positive electrode material prepared by the method has the characteristics of low free lithium content, perfect crystal structure, high specific capacity and the like. Compared with the existing positive electrode material, the positive electrode material prepared by the technology provided by the invention shows the excellent electrochemical performance; the power battery energy density improvement, the service life prolonging and the like are facilitated.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material and a preparation method thereof, in particular to a nickel cobalt lithium aluminate positive electrode material and a preparation method thereof. Background technique [0002] In recent years, with the rise of smart phones, smart cars, and new energy vehicles, and more and more mobile devices have become data collection points and integration points for big data and the Internet of Things, the market demand for lithium-ion batteries is also increasing. come higher. In 1974, American professor J.Goodenough discovered lithium intercalation crystal LiCoO 2 , LiNiO 2 , LiMn 2 o 4 It can be used as a battery material. After nearly 40 years of research and development, LiCoO is currently the main choice for commercial lithium-ion secondary batteries. 2 It is a positive electrode material, but the relatively poor cobalt element leads to high raw material costs. LiNiO 2 and LiCo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/58H01M4/46H01M10/0525
CPCH01M4/463H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 杨亿华钟毅
Owner 湖南金富力新能源股份有限公司
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