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Lithium-ion battery limnpo 4 Preparation method of positive electrode carbon coating

A lithium ion battery, carbon coating technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of ineffective protection of positive electrode materials, reduce battery cycle stability, etc., achieve high conductivity, ion diffusion The effect of large coefficients

Active Publication Date: 2021-03-30
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In Li-ion batteries, the electrolyte easily penetrates into the LiMnPO through these cracks. 4 positive electrode, and with LiMnPO 4 Side reactions occur at the positive electrode, which cannot effectively protect the positive electrode material and reduce the cycle stability of the battery

Method used

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  • Lithium-ion battery limnpo <sub>4</sub> Preparation method of positive electrode carbon coating
  • Lithium-ion battery limnpo <sub>4</sub> Preparation method of positive electrode carbon coating
  • Lithium-ion battery limnpo <sub>4</sub> Preparation method of positive electrode carbon coating

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Experimental program
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Embodiment

[0039] 30g of Fe 2+ Doped lithium ion battery LiMnPO4 70 g of quinoline soluble mixture of coal tar pitch was added to the positive electrode precursor, and the concentration of the quinoline soluble mixture of coal tar pitch was 60%. Stir and disperse at 100°C for 30 minutes at a temperature of 3000r / min, and then filter; add the quinoline soluble precursor of the filtered coal tar pitch to silicone oil to cool, stir and disperse for 60 minutes, and filter; then filter The quinoline solubles coated precursor of coal tar pitch was vacuum-dried at a drying temperature of 80°C and a drying time of 180 min; the dried product was mixed with Li 2 The O powder is evenly mixed at a weight ratio of 1:1, and carbonized once in isolation from the air. The carbonization temperature is 350°C, kept warm for 2 to 4 hours, and cooled naturally; The temperature is 100°C, and the drying time is 120min; the dry sample is carbonized for the second time under the condition of isolated air or ine...

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Abstract

The invention relates to a preparation method of a lithium ion battery LiMnPO4 positive electrode carbon coating. The adopted technical scheme is as follows: quinoline soluble substances in coal pitchare used as a carbon source, and a quinoline soluble substance mixed solution of the coal pitch and a LiMnPO4 positive electrode precursor are utilized to form a stable colloid to realize uniform spherical coating of the LiMnPO4 precursor; and then, a carbon-coated lithium ion battery LiMnPO4 positive electrode material is prepared through organic solvent separation and secondary carbonization processes, wherein the primary carbonization adopts a soluble inorganic solid powder and precursor blending carbonization method to prepare the lithium ion battery LiMnPO4 positive electrode carbon-coated material. The preparation method can prepare the lithium ion battery LiMnPO4 positive electrode material, which is high in conductivity and large in ion diffusion coefficient, homogeneous and has spherical layered structure coated carbon.

Description

technical field [0001] The invention relates to a lithium ion battery LiMnPO 4 Preparation method of positive electrode carbon coating. Background technique [0002] Lithium-ion battery LiMnPO 4 The intrinsic electronic conductivity and lithium ion mobility of the positive electrode are very low, especially those containing PO 4 3- Anode materials with polyanionic groups, such as LiMnPO 4 etc., resulting in problems such as low conductivity, poor high-current charge-discharge capacity, and fast attenuation, which hinder its commercial development. The use of carbon coating can improve the electronic conductivity between the particles of the positive electrode material and reduce the degree of polarization during the charge and discharge process of the positive electrode; at the same time, the layered structure of the carbon layer can also increase the diffusion and migration rate of lithium ions, and improve the charge and discharge capacity and cycle of the positive ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/583H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 范长岭陈石林梁玉林
Owner HUNAN UNIV