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Lithium ion battery cathode material and preparation method thereof, and application thereof

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reducing high-nickel ternary cathode materials, reducing the magnetic properties of cathode materials, etc., to achieve good body consistency, easy to powder Body processing, the effect of suppressing the generation of magnetic impurities

Active Publication Date: 2019-05-07
贵州高点科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The purpose of the present invention is to develop a surface lithium-rich positive electrode material based on the magnetic substance of the positive electrode material of the lithium ion battery to solve the problem of the magnetic substance, in order to reduce the magnetism of the high-nickel ternary positive electrode material and make up a small amount in the later stage of material generation Lithium, with the help of lithium melting effect and oxygen-rich atmosphere, magnetic impurities are generated into salts or other compounds with low magnetic pole moments, so as to achieve the purpose of reducing the magnetism of positive electrode materials

Method used

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  • Lithium ion battery cathode material and preparation method thereof, and application thereof
  • Lithium ion battery cathode material and preparation method thereof, and application thereof
  • Lithium ion battery cathode material and preparation method thereof, and application thereof

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[0055] In a preferred embodiment, the present invention provides a positive electrode material with low magnetic impurities and its preparation method, which is characterized in that: a surface lithium-rich positive electrode material is generated on the surface of the semi-finished product during the synthesis stage, and the strong magnetic The substance is transformed into a low magnetic substance.

[0056] Preferably, the above-mentioned positive electrode material is characterized in that: the structural formula of the material is Li x Ni a co b mn c m d o 2 Among them, R is a doping element, 0.95<x<1.15, 0.60<a<0.95, 0<b<0.2, 0<c<0.3, 0.98≤a+b+c≤1.00, wherein manganese (Mn) can be Aluminum element (Al) is substituted, corresponding to the content of aluminum element: 0<c<0.08.

[0057] Preferably, the preparation process of the above-mentioned positive electrode material comprises the following steps:

[0058] (1) Mix raw materials including the first lithium sourc...

Embodiment 1

[0085] Material mixing: use 200L plow mixer. Turn on stirring (speed 25rpm), add 100kg of nickel-cobalt-manganese precursor (Ni 0.61 co 0.19 mn 0.20 (OH) 2 (grain size D v50 : 7 μm, effective substance content 99.5%), then take by weighing 46.1kg monohydrate lithium hydroxide powder (particle size D v50 : 25 μm, active substance content 98.5%) join in mixer, add 37.0kg deionized water by 80wt% solid content under stirring situation, then add 1.43kg basic cobalt carbonate (account for 7000ppm by adding and cobalt amount according to finished product) After stirring for 2 hours, further reduce the speed (5rpm) and stir for 6 hours to form a paste-like material with a certain degree of molding and seal it for later use.

[0086] 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 500Nm 3 / h) Put the m...

Embodiment 2

[0093] Material mixing: use 200LY mixer. Start stirring (rotating speed 50rpm), add the nickel-cobalt-manganese precursor (Ni 0.61 co 0.20 mn 0.20 (OH) 2 (grain size D v50 : 7 μm, effective substance content 99.5%), then take by weighing 41.5kg lithium carbonate powder (particle size D v50 : 5 μm, active ingredient content 98.8%) into the mixer, add 20.0kg deionized water according to 90% solid content under stirring, and 7.45kg n-tetrabutyl titanate (industrial grade, active ingredient content 20%, content The titanium content in the finished product is 2000ppm), after stirring for 2 hours, further reduce the speed (5rpm) and stir for 1 hour to form a paste-like material with a certain degree of molding, which is discharged and sealed for later use.

[0094] Primary sintering: adopt the method similar to embodiment 1 to carry out primary sintering (sintering temperature 700 ℃, oxygen content of oxygen-enriched air 99.5%, flow 300Nm 3 / h), embodiment 2 loss on ignition i...

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Abstract

The invention relates to a lithium ion battery cathode material and a preparation method thereof and application thereof. The cathode material has a chemical formula of LixNiaCobRcMdO2, R is selectedfrom manganese or aluminum, M is a doping element, 0.95<x<1.15, 0.60<a<0.95, 0.0<b<0.2, 0.98<=a+b+c<=1.00, 0<=d<0.1, 0.0<c<0.3; in the cathode material, the magnetic substance content is not larger than 100ppb. A surface-rich lithium-type ternary cathode material in the preparation and synthesis stage is generated to effectively suppress the generation of the magnetic impurities, the prepared lithium ion battery cathode material is good in consistency, consistent in the surface smoothness topography and easy for powder processing, the magnetic material of the finished product is with 100ppb, is high in safety and can be widely applied in the fields of 3C and xEV, and ESS.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, mainly to the field of lithium ion battery positive electrode materials, and in particular to the lithium ion battery positive electrode material and its preparation method and application. Background technique [0002] Due to the advantages of high energy density, high working voltage and long cycle life, lithium-ion secondary batteries are widely used as power sources for various mobile devices, energy storage power stations, and even in aviation, aerospace, navigation, automobiles, medical equipment, etc. Gradually replace other traditional batteries in the field. [0003] 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 more than 40 years of research and development, LiCoO is currently the main choice for commercial lithium-ion secondary batteries. 2 It is a positive ...

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
CPCY02E60/10
Inventor 赵孝连曾国城杨亮亮徐健张建民
Owner 贵州高点科技有限公司
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