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Lithium manganese oxide cathode material, preparation method and application

A cathode material, lithium manganate technology, used in manganate/permanganate, battery electrodes, structural parts, etc., can solve the problems of poor high temperature cycle performance and safety performance risks of lithium manganate cathode materials, and achieve Wide applicability, obvious effect, good application prospect

Active Publication Date: 2020-11-17
湖南金富力新能源股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technical problem solved by the present invention is: the existing lithium manganate positive electrode material for lithium ion batteries has problems such as poor high-temperature cycle performance during use, and there are risks in safety performance, so it is urgent to develop a new simple and feasible material from the material itself ways to improve

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  • Lithium manganese oxide cathode material, preparation method and application
  • Lithium manganese oxide cathode material, preparation method and application
  • Lithium manganese oxide cathode material, preparation method and application

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preparation example Construction

[0054] The present invention also provides a method for preparing the above-mentioned lithium manganate cathode material, comprising the following steps:

[0055] Step 1: Mix the manganese source compound, the lithium source compound and the compound containing D element, and heat-treat to obtain a semi-finished lithium manganate cathode material;

[0056] Step 2: Mix the semi-finished lithium manganate positive electrode material obtained in step 1 with a compound containing R element, and heat-treat to obtain the lithium manganate positive electrode material;

[0057] Wherein, the compound containing D element is one or more of aluminum source compound, titanium source compound and barium source compound.

[0058] Preferably, wherein the manganese source compound described in step 1 is selected from one or more of manganese tetraoxide, manganese hydroxide, manganese dioxide, manganese trioxide, manganese oxide and manganese heptoxide, It is preferably one or more of trimang...

Embodiment 1

[0088] Select 500L fusion machine for use, start stirring (500rpm), add 84.8kg trimanganese tetroxide (D v50 : 9.0 μm), then weigh 23.3kg monohydrate lithium hydroxide powder and join in the 500L fusion machine, then weigh 4.2kg nano-barium carbonate, and 3.5kg nano-titanium dioxide, add 28.9 kg by 80wt% solid content under stirring kg of deionized water, after stirring for 0.5h, further reduce the speed (50rpm) and stir for 20min to form a paste material with a certain degree of shaping for later use.

[0089] 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), the above-mentioned pasty material is packed into the ceramic sagger for pre-sintering, the sintering time is 15h, the material is isolated from the air and cooled to normal temperature, the weight of the incoming and outgoing materials is weighed...

Embodiment 2

[0093] Select a 500L coulter type mixer for use, start stirring (spindle speed 120rpm, side knife speed 1500rpm), add 96.2kg of electrolytic manganese dioxide (D v50 : 9 μm), then take by weighing 21.3kg lithium carbonate powder and join in the 500L coulter type mixer, add 0.8kg nanometer aluminum oxide (industrial grade, purity 99.5%), 11kg deionized water under stirring situation, 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.

[0094] 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 16 hours. The material was isolated from the air and cooled to normal temperature, and the weight of the...

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Abstract

The invention relates to the field of lithium ion batteries. A lithium manganate positive electrode material is characterized in that the lithium manganate positive electrode material has the chemicalformula of Li(1+x)Mn2DaRbOc, wherein 0.001<x<0.1, 0.01<a<0.25, 0.001<b<0.006, and 4<c<4.5, D is one or two or more of aluminum, barium and titanium elements, and R is a doping element. The preparation method comprises the following steps: step 1, mixing a manganese source compound, a lithium source compound and a compound containing an element D, and carrying out heat treatment to obtain a lithium manganate positive electrode material semi-finished product; and step 2, mixing the lithium manganate positive electrode material semi-finished product obtained in the step 1 with a compound containing an R element, and carrying out heat treatment to obtain the lithium manganate positive electrode material. The high-temperature cycle performance of the lithium battery prepared from the lithium manganate material can be improved, and 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, and in particular to a preparation method of lithium manganate positive electrode materials. Background technique [0002] In recent years, with the rise of new energy vehicles, the requirements for energy density, cycle reliability and safety of mobile devices are getting higher and higher. At present, the common cathode materials for lithium-ion batteries mainly include lithium cobaltate, lithium manganate, nickel-cobalt Lithium manganate and lithium iron phosphate. Among them, although lithium cobalt oxide has a high energy density, it is mainly used in small lithium-ion batteries in the 3C field due to limited cobalt storage. Lithium manganese oxide and lithium iron phosphate materials have low energy densities, and are gradually being replaced by nickel-cobalt lithium manganese oxide. The trend of su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M10/0525C01G45/12H01M4/131
CPCC01G45/12H01M4/131H01M4/505H01M10/0525Y02E60/10
Inventor 杨亿华王海涛钟毅
Owner 湖南金富力新能源股份有限公司
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