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A kind of lithium manganate cathode material and preparation method and application thereof

A positive electrode material, lithium manganate technology, applied in chemical instruments and methods, manganate/permanganate, manganese compounds, etc., can solve the problems of oversized single battery safety, poor high-temperature cycle performance, and existing risks , to achieve the effect of improved safety performance, obvious effect and wide applicability

Active Publication Date: 2020-11-17
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

[0010] The technical problem solved by the present invention is: although the existing lithium manganate positive electrode material for lithium ion batteries has high cost performance and safety, there is a risk in safety when used in groups or when the single battery is too large, and the high-temperature cycle performance is poor , so starting from the material itself, it is urgent to develop a new simple and feasible improvement method

Method used

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  • A kind of lithium manganate cathode material and preparation method and application thereof
  • A kind of lithium manganate cathode material and preparation method and application thereof
  • A kind of lithium manganate cathode material and preparation method and application thereof

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preparation example Construction

[0044] The present invention also provides a method for preparing the above-mentioned lithium manganate positive electrode material, comprising the following steps:

[0045] Step 1: Mix the manganese source compound and the lithium source compound, and heat-treat to obtain a semi-finished lithium manganate cathode material;

[0046] Step 2: Mix the semi-finished lithium manganate positive electrode material obtained in step 1 with a compound containing the doping element R, and heat-treat to obtain the lithium manganate positive electrode material;

[0047] Wherein, before heat treatment in step 1 or step 2, a boron source compound is also added.

[0048] Wherein, the lithium source compound can be added step by step, for example, after adding a part in step 1, the rest is added in step 2.

[0049] Preferably, in the preparation method, wherein the manganese source compound described in step 1 is selected from oxides and / or hydroxides of manganese, preferably trimanganese tet...

Embodiment 1

[0069] Select the 500L fusion machine for use, start stirring (400rpm), and add 76.5kg trimanganese tetroxide (D v50 : 9.0 μm), then weigh 35.6kg monohydrate lithium hydroxide powder and join in the 500L fusion machine, then weigh 6.3kg boric acid, add 29.5kg 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.

[0070] 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 and carry out pre-sintering. The pre-sintering time is 15h. The material is isolated from the air and cooled to normal temperature. The ratio of powder quality difference to powder quality before pre-s...

Embodiment 2

[0076] Select a 500L coulter type mixer for use, start stirring (spindle speed 120rpm, side knife speed 1500rpm), add 83.9kg of electrolytic manganese dioxide (D v50 : 9.0 μ m), then take by weighing 21.7kg lithium carbonate powder and join in the 500L coulter type mixer, add 31.7kg lanthanum nitrate hexahydrate under stirring situation, 15.3kg deionized water, further reduce speed after stirring 2h ( 3-5rpm) stirring for 6 hours to form a powdery material with a certain degree of molding for later use.

[0077] 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 pre-sintering time was 16 hours. The material was isolated from the air and cooled to normal temperature, and the weight of the incoming and outgoing material...

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Abstract

The invention provides a lithium manganate positive electrode material, which has a chemical formula of Li(1+3a+b)Mn2BARbO(4+3a+2b), wherein R is a doping element, a is more than 0 and less than 0.1,and b is more than 0 and less than 0.2. The invention further provides a preparation method of the positive electrode material, wherein the method comprises: 1, mixing a manganese source compound anda lithium source compound, and carrying out heat treatment to obtain a lithium manganate positive electrode material semi-finished product; and 2, mixing the lithium manganate positive electrode material semi-finished product obtained in the step 1 and a compound containing a doping element R, and carrying out heat treatment to obtain the lithium manganate positive electrode material, wherein a boron source compound is added before the heat treatment in the step 1 or the step 2. According to the invention, the method can easily improve the safety performance of the lithium manganate material,and has characteristics of economy, feasibility, wide applicability, obvious effect and 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 the energy density, safety, cycle life, and cost performance of chemical power sources / stacks have become higher and higher. At present, lithium sources in lithium-ion batteries are prepared as cathode materials. It is packaged in a lithium-ion battery, so the lithium content in the positive electrode material determines the energy density of the lithium battery and the cost of the lithium-ion battery. Common lithium-ion battery cathode materials mainly include lithium cobaltate, lithium manganate, nickel-cobalt lithium manganate and lithium iron phosphate. Among them, although lithium cobalt oxide has a high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/12H01M4/131H01M4/505H01M10/0525
CPCC01G45/1221C01G45/1235C01P2004/61C01P2006/12H01M4/131H01M4/505H01M10/0525Y02E60/10
Inventor 杨亿华王海涛钟毅
Owner 湖南金富力新能源股份有限公司