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New preparation method of positive and negative electrode materials of lithium ion secondary cell by spraying thermal decomposition

A secondary battery, spray pyrolysis technology, applied in the direction of battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of particle size, shape specific surface area and tap density that are difficult to meet the requirements, complex process routes, cumbersome processes, etc. , to achieve the effect of avoiding roasting process, low energy consumption and continuous process

Inactive Publication Date: 2006-07-19
HUNAN RESHINE NEW MATERIAL
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Problems solved by technology

The process route of the wet chemical method is more complicated than that of the solid phase method, and the process is cumbersome. The production process is easy to bring in impurities such as iron, sodium, magnesium, calcium, etc., and the positive electrode material prepared by this method has poor particle size, morphology, specific surface area and vibration. The density is difficult to meet the requirements

Method used

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  • New preparation method of positive and negative electrode materials of lithium ion secondary cell by spraying thermal decomposition
  • New preparation method of positive and negative electrode materials of lithium ion secondary cell by spraying thermal decomposition
  • New preparation method of positive and negative electrode materials of lithium ion secondary cell by spraying thermal decomposition

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preparation example Construction

[0021] The preparation process of the present invention is as follows:

[0022] 1. Precursor configuration

[0023] Weigh lithium salt or tin salt or manganese salt or titanium salt and one or more metal salts mentioned above according to the stoichiometric ratio and weigh the raw materials required to prepare the product, and mix and dissolve them in deionized water or organic solvent , dubbed 0.05-1.5mol / l precursor solution. The organic solvent is any one of acetic acid, ethanol, and maleic acid.

[0024] 2. Precursor atomization

[0025] The mixed multi-component solution is atomized through the atomization system, the atomization volume is 20-200ml / min, and the medium gas atomization pressure is 0.5-10MPa. Driven by the hydraulic pump, the precursor liquid enters the nozzle and is atomized into fine droplets under the impact of high-speed airflow. The particle size of the droplets after atomization is 5-100μm.

[0026] 3. Drying, pyrolysis and sintering process in the...

Embodiment 1

[0031] Weigh LiCl·6H with a molar ratio of Li:Ni:Co:Mn of 3:1:1:1 2 O, NiCl 2 ·6H 2 O, CoCl 2 ·6H 2 O, MnCl 2 4H 2 O, add deionized water to form a precursor solution of 0.2-0.5mol / l, and use a hydraulic pump to feed at a rate of 40-150ml / min, and control the pressure of the atomizing air in the nozzle to atomize under 1-3MP. Drops pass through the pyrolysis reactor to complete drying, pyrolysis, and sintering in an instant to directly obtain spherical or quasi-spherical LiNi with excellent crystal quality and high vibration density. 1 / 3 co 1 / 3 mn 1 / 3 o 2 , the button battery made of this material has a detection specific capacity of 184mAh / g, and the charge-discharge efficiency is still greater than 98.5% after 100 charge-discharge cycles.

Embodiment 2

[0033] Weigh SnCl and TiCl with the Sn:Ti molar ratio of 1:1 2 , adding deionized water to make a precursor solution of 0.1-1.5mol / 1, through the hydraulic pump with a feed rate of 20-150ml / min, the pressure of the atomizing air of the nozzle is controlled at 1-3MP to atomize, and the droplets Through the pyrolysis reaction furnace, the drying, pyrolysis and sintering are completed in an instant, and the spherical or quasi-spherical SnTiO with excellent crystal quality and large vibration ratio can be obtained directly. 2 , The material is made into a button battery with a detected specific capacity of 380mAh / g, and the charge-discharge efficiency is still greater than 95% after 100 charge-discharge cycles.

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Abstract

The invention relates to a method for preparing the lithium secondary battery anode and cathode material with spraying pyrogenation. It mixes one or several of lithium salt, tin salt, manganese salt, titanium salt or other transition salt as Co, Ni, Mn, V, Ti, Al, and Mg in pure water, alcohol or organic solution, and via the spraying pyrogenation to prepare the anode and cathode material while the pyrogenation furnace reaction temperature is 400-1000Deg. C and the time of particle in the furnace is 4-12s.The invention can prepare the lithium anode and cathode material in different systems in one device by adjusting the processing parameters with better granularity, single shape, uniform distributed components and high vibration density. The invention has simple process, lower cost, continuous process, high yield, high quality and the application for industry production.

Description

technical field [0001] The invention relates to a method for preparing battery materials, in particular to a new method for preparing positive and negative electrode materials for lithium ion secondary batteries. Background technique [0002] Lithium-ion secondary battery is a high specific energy storage battery with lithium intercalation compound as the positive electrode material. It has the advantages of high battery voltage, high specific energy, long cycle life, small self-discharge, and is conducive to environmental protection. Therefore, it has become more and more popular. Attention professional technicians. In the extensive application of lithium-ion batteries, the performance and price of the battery are the decisive factors, and one of the key factors for the preparation of a good performance-cost ratio is to provide ideal lithium intercalation compound positive and negative electrode materials. [0003] The traditional methods of synthesizing cathode materials ...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/48H01M4/58C01D15/00C01G1/02C01G45/00C01G51/00C01G53/00
CPCY02E60/10
Inventor 胡国荣
Owner HUNAN RESHINE NEW MATERIAL
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