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Preparation method for spherical doped lithium manganate

A technology of lithium heteromanganate and spherical shape, which is applied in the field of lithium-ion battery cathode materials, can solve the problems of low impurity content and poor cycle performance of lithium manganate, and achieve the effects of simple process flow, improved cycle performance, and easy realization of large-scale production

Inactive Publication Date: 2017-10-10
GUANGXI GUILIU CHEM CO LTD +1
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  • Description
  • Claims
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for preparing spherical doped lithium manganese oxide with low impurity content and uniform molecular distribution of doping elements, which can solve the problem of poor cycle performance of lithium manganate

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  • Preparation method for spherical doped lithium manganate
  • Preparation method for spherical doped lithium manganate
  • Preparation method for spherical doped lithium manganate

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preparation example Construction

[0025] A kind of preparation method of spherical doped lithium manganate, the chemical formula of spherical doped lithium manganate is Li 1+x mn 2-y m y-x o 4 , wherein M is a doping element, M is at least one of Li, Ni, Mg, Al, Co, Cr, Ti and other elements, 0≤x≤0.1, 0≤y-x≤0.5. Spherical doped lithium manganate is a lithium manganate particle with a cubic spinel structure and space group Fd-3m (No.227); its impurity content is low, and the impurity content of potassium, sodium, and calcium is less than 50ppm, and the impurities of iron and copper are less than 50ppm. The content is less than 20ppm, and the sulfate content is less than 0.1%; the doping elements are uniformly distributed at the molecular level inside the lithium manganate particles, which can improve the structural stability; the microscopic secondary particle morphology is spherical, and the particle size is D 50 5μm~20μm; specific surface area is less than 0.8m 2 / g, the tap density is greater than 2.0g / c...

Embodiment 1

[0038] A kind of spherical doped lithium manganate of the present invention, its chemical formula is Li 1.05 mn 1.80 Al 0.15 o 4 .

[0039] Prepare 20L of mixed solution of manganese sulfate and aluminum sulfate with a divalent manganese ion concentration of 60g / L and a trivalent aluminum ion concentration of 2.5g / L with pure water, weigh 60g of isopropanol and 70g of sodium fluoride and add them to the solution Stir evenly; use pure water to prepare 20L of sodium hydroxide solution with a concentration of 200g / L, according to the flow rate of 500mL / h of manganese sulfate and aluminum sulfate mixed solution, the sum of the moles of manganese ions and aluminum ions and the moles of sodium hydroxide The ratio is 1:2. Use a metering pump to add the mixed solution and sodium hydroxide solution into a reactor with a volume of 10L. The temperature of the reaction is controlled at 70°C, and the pH of the reaction solution is 10.0. At the same time, a sufficient amount of The air ...

Embodiment 2

[0044] A kind of spherical doped lithium manganate of the present invention, its chemical formula is Li 1.05 mn 1.85 Al 0.10 o 4 .

[0045] Prepare 20L of mixed solution of manganese sulfate and aluminum sulfate with a divalent manganese ion concentration of 60g / L and a trivalent aluminum ion concentration of 1.6g / L with pure water, weigh 60g of isopropanol and 70g of sodium fluoride and add them to the above solution and Stir evenly; use pure water to prepare 20L of sodium hydroxide solution with a concentration of 200g / L, according to the flow rate of 500mL / h of manganese sulfate and aluminum sulfate mixed solution, the sum of the moles of manganese ions and aluminum ions and the moles of sodium hydroxide The ratio is 1:2, the mixed solution and sodium hydroxide solution are added into a reactor with a volume of 10L by a metering pump, the pH value of the reaction solution is 10.0, and the temperature of the reaction is controlled to be 70°C. Use 10% hydrogen peroxide to...

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Abstract

The invention relates to a preparation method for spherical doped lithium manganate. The preparation method comprises the following steps of (1) weighing doped element soluble salt and solute manganese salt with divalent manganese and preparing with water to form a mixed solution containing doped element ions and divalent manganese ions; (2) preparing a sodium hydroxide solution; (3) continuously adding the mixed solution and the sodium hydroxide solution into a reactor, performing a coprecipitation reaction, and meanwhile, adding sufficient oxidizing agent to the reaction liquid to perform oxidation treatment on precipitates, and next, performing rinsing by water and drying to obtain spherical-doped manganous-manganic oxide; and (4) weighing lithium carbonate or lithium hydroxide spherical doped manganous-manganic oxide to be fully mixed, and performing high-temperature roasting in the oxygen or air atmosphere to obtain spherical doped lithium manganate. The spherical doped lithium manganate prepared in the invention is low in impurity content and uniform in doped element molecule scale, and capable of solving the problem of relatively poor cycling performance of lithium manganate.

Description

technical field [0001] The invention relates to a preparation method of spherical doped lithium manganese oxide, which belongs to the field of positive electrode materials of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, high specific energy, and no memory effect. They are used in consumer digital products (smart phones, laptops, etc.), electric vehicles, and energy storage batteries. In recent years, with the continuous improvement of lithium-ion battery technology, electric vehicles have developed rapidly. Among them, Tesla Model S, Nissan Leaf, Chevrolet Volt, BYD E6 and other electric vehicles have achieved good market sales, and the market for lithium-ion battery cathode materials for power batteries Demand has also increased. At present, the most mature cathode material for commercialization is lithium cobalt oxide (LiCoO 2 ), it has good electrochemical performance, but it is not safe and...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCH01M4/364H01M4/505H01M4/628H01M10/0525Y02E60/10
Inventor 覃胜先吴元花许雄新徐星意张亮乐陆云平
Owner GUANGXI GUILIU CHEM CO LTD
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