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Preparation methods for single-crystal type lithium manganate material and precursor thereof

A type of lithium manganate and precursor technology, applied in the field of preparation of single crystal lithium manganate materials, can solve the problems of unfavorable single crystallization, low demand for energy consumption, high cost of electrolytic manganese dioxide, etc., and achieve the goal of reducing consumption Effect

Inactive Publication Date: 2020-05-12
WUXI JEWEL POWER & MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art, provide a preparation method of a single crystal lithium manganate material, and solve the problem that the commonly used electrolytic manganese dioxide (EMD) has a high cost and is not conducive to single Crystallization problem, while using the trimanganese tetraoxide precursor to produce lithium manganese oxide, the required lithium element material is not much, and the demand for energy consumption is low

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  • Preparation methods for single-crystal type lithium manganate material and precursor thereof

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Embodiment 1

[0024] A method for preparing monocrystalline lithium manganate material, comprising the following steps:

[0025] A. Heating manganese sulfate in a rotary kiln to 1250°C for desulfurization to generate trimanganese tetraoxide;

[0026] B, after cooling the above-mentioned trimanganese tetraoxide, pulverize it in a jet mill so that its particle size distribution D50 is between 3-8 μm;

[0027] C, the trimanganese tetraoxide and Lithium Carbonate after above-mentioned pulverization are 2: 1.06 batching according to manganese, lithium element molar ratio, mix uniformly;

[0028] D. Sinter the above mixture at 820°C for 10 hours, and after cooling, crush and sieve the material. A single crystal lithium manganate was obtained.

Embodiment 2

[0030] A method for preparing monocrystalline lithium manganate material, comprising the following steps:

[0031] A. Heating manganese sulfate in a rotary kiln to 1250°C for desulfurization to generate trimanganese tetraoxide;

[0032] B, after cooling the above-mentioned trimanganese tetraoxide, pulverize it in a jet mill so that its particle size distribution D50 is between 3-8 μm;

[0033] C, the trimanganese tetraoxide and Lithium Carbonate after above-mentioned pulverization are 2: 1.06 batching according to manganese, lithium element molar ratio, mix uniformly;

[0034] D, in above-mentioned mixture, mix the niobium pentoxide that mass ratio is 0.5% as additive, mix homogeneously;

[0035] E. Sinter the above mixed material at 800°C for 10 hours, and after cooling, crush and sieve the material. A single crystal lithium manganate was obtained.

[0036] figure 1 It is the SEM figure of the single crystal lithium manganate material prepared by the inventive method; f...

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Abstract

The invention discloses a preparation method for a single-crystal type lithium manganate material precursor. The preparation method comprises the following steps: S1, firing manganese sulfate solid powder at 1200-1400 DEG C until a sulfur element is separated from the manganese sulfate solid powder so as to form a manganous-manganic oxide material; S2, during high-temperature sintering, allowing the formed manganous-manganic oxide material to form a trace molten state, and carrying out cooling so as to generate partial agglomeration; and S3, crushing a agglomerated material until the particlesize distribution required by a lithium manganate material is achieved. A single-crystal type lithium manganate material is prepared through the following steps: mixing the prepared precursor, namelythe manganous-manganic oxide material with lithium carbonate, and carrying out sintering at 780-850 DEG C for 5-15 hours so as to obtain the single-crystal type lithium manganate material. According to the invention, the problems that commonly-used electrolytic manganese dioxide (EMD) is high in cost and is not beneficial to single crystallization during firing are solved; meanwhile, when the manganous-manganic oxide precursor is used for producing lithium manganate, few lithium element materials are needed, and the requirement on energy consumption is low.

Description

technical field [0001] The invention relates to a preparation method of a single crystal lithium manganese oxide material. Background technique [0002] As a clean energy storage component, lithium-ion batteries are widely used in many fields such as electric vehicles, electric bicycles, electric tools, digital products, mobile power supplies, and energy storage batteries. Lithium battery cathode material is a key component of lithium battery. Lithium manganese oxide, as the cathode active material, has gradually become one of the mainstream materials for civilian lithium-ion power batteries. [0003] Lithium manganate cathode material has many advantages such as high voltage, good rate performance, good low temperature performance, good safety performance, and low cost. However, its high self-discharge rate and poor high-temperature cycle performance have become the main problems restricting its development to more application fields. For the improvement of lithium mangan...

Claims

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Application Information

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IPC IPC(8): C30B1/00C30B1/10C30B29/16C30B29/22H01M4/505H01M10/0525
CPCC30B1/00C30B1/10C30B29/16C30B29/22H01M4/505H01M10/0525Y02E60/10
Inventor 马岩华赵春阳李佳军包希文邓亚烽钱飞鹏
Owner WUXI JEWEL POWER & MATERIALS