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Secondary structure lithium manganate ion cathode material for lithium ion battery and preparation method thereof

A technology of structural lithium manganese oxide and positive electrode materials, which can be used in positive electrodes, secondary batteries, structural parts, etc., can solve the problems of low energy density and low compaction density of pole pieces, expand the application environment, and improve electrochemical performance , the effect is obvious

Active Publication Date: 2019-12-20
湖南金富力新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem solved by the present invention is: the energy density of the existing lithium manganate positive electrode material for lithium ion batteries is low during use, and the material particles are sharp and angular, resulting in a low compaction density of the pole piece. Therefore, starting from the material itself, it is urgent to develop a A New Simple and Feasible Improvement Method

Method used

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  • Secondary structure lithium manganate ion cathode material for lithium ion battery and preparation method thereof
  • Secondary structure lithium manganate ion cathode material for lithium ion battery and preparation method thereof
  • Secondary structure lithium manganate ion cathode material for lithium ion battery and preparation method thereof

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Embodiment 1

[0054] Prepare materials: select 500L fusion machine, start stirring (400rpm), add 76.5kg trimanganese tetroxide (D v50 : 10 μm), then weigh 26.2kg monohydrate lithium hydroxide powder and join in the 500L fusion machine, then weigh 6.1kg nanometer cobalt tetroxide, add 27.7kg deionized water by 80wt% solid content under stirring, stir for 0.5h Then further reduce the speed (50rpm) and stir for 20 minutes to discharge the material to form a paste material with a certain degree of molding for later use.

[0055] Pre-burning and dehydration: adopt ventilated 24m roller kiln. Set the temperature in the heating zone to 200°C, and introduce oxygen-enriched air (the volume ratio of oxygen content is 60%, and the gas input volume is 180Nm 3 Under the condition of / h), put the above-mentioned pasty material into the ceramic sagger for pre-sintering, the sintering time is 7h, the material is isolated from the air and cooled to normal temperature, the weight of the incoming and outgoin...

Embodiment 2

[0059] Prepare materials: select 500L coulter type mixer for use, start stirring (main shaft 120rpm, side knife speed 1500rpm), add 85.4kg electrolytic manganese dioxide ((D v50 : 9 μm)), then take by weighing 24.4kg lithium carbonate powder, add 0.25kg nano-cobaltous hydroxide and join in the 500L coulter type mixer, add and dissolve 26.2kg pentahydrate nitric acid with 10kg deionized water under stirring situation Zirconium solution, after stirring for 2 hours, further reduce the speed (3-5rpm) and stir for 6 hours to form a powdery material with a certain degree of molding for later use.

[0060] Pre-burning and dehydration: adopt ventilated 24m roller kiln. Set the temperature in the heating zone to 500°C, and introduce oxygen-enriched air (the volume ratio of oxygen content is 65%, and the gas input volume is 400Nm 3 Under the condition of / h), the above-mentioned pasty material was put into a ceramic sagger for pre-sintering. The sintering time was 13 hours. The materia...

Embodiment 3

[0063] Material preparation: Select a 500L kneader, start stirring (30rpm), add 94.3kg of manganese hydroxide under stirring, then weigh 38.9kg of lithium oxalate powder and add it to the kneader, weigh 2kg of basic cobalt carbonate, 34.6kg Deionized water, after stirring for 1 hour, further reduce the speed (10 rpm) and stir for 30 minutes to form a paste-like material with a certain degree of shaping for later use.

[0064]Pre-burning and dehydration: adopt ventilated 24m roller kiln. Set the temperature in the heating zone to 750°C, under the condition of introducing oxygen-enriched air (the volume ratio of oxygen content is 70%, the gas input volume is 500Nm 3 / h) Put the above-mentioned pasty material into a ceramic sagger for sintering. The sintering time is 8 hours. The material is isolated from the air and cooled to normal temperature. Then pulverize with a gas vortex pulverizer to obtain a lithium manganate cathode material semi-finished product 1, the particle size ...

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a spherical secondary structure lithium manganate ion cathode material for a lithium ion battery and a preparation methodthereof. The chemical formula of the lithium manganate lithium ion cathode material is Li(1+x)Mn2RaOb, R is a doping element at least containing cobalt, x is more than 0.01 and less than 0.22, a is more than 0.05 and less than 0.25, and b is more than 4 and less than 4.6; the preparation method comprises the following steps of: mixing a manganese source precursor, a lithium source compound and a doped element compound according to a stoichiometric ratio, carrying out presintering dehydration to prepare a lithium manganate semi-finished product 1, mixing the lithium manganate semi-finished product 1 with a cobalt source compound, performing re-sintering and crushing to prepare the lithium ion battery cathode material. The secondary structure type lithium manganate with relatively high sphericity degree is prepared, crystal edges and corners of a semi-finished product lithium manganate are reduced, and the compaction density of a lithium manganate material is improved. The preparation method is economical, feasible, wide in applicability and obvious in effect, and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, mainly to the field of positive electrode materials of lithium ion batteries, in particular to a spherical secondary structure lithium manganate positive electrode material and a preparation method thereof. Background technique [0002] In recent years, with the rise of new energy vehicles, portable electric tools, and combined energy storage power stations, the requirements for the power energy density and safety of the chemical power sources used in them are getting higher and higher. At present, the common cathode materials for lithium-ion batteries are mainly There are lithium cobalt oxide, lithium manganese oxide, nickel cobalt lithium manganese oxide and lithium iron phosphate. Among them, although lithium cobalt oxide has high energy density, it is mainly used in small lithium-ion batteries in the 3C field due to limited cobalt storage and poor safety of lithium cobalt oxide....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 杨亿华王海涛钟毅
Owner 湖南金富力新能源股份有限公司