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Preparing method of anode material of lithium ion battery

A technology for lithium-ion batteries and cathode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as high cost, long cycle, and voltage platform reduction, and achieve industrial-scale clean production, excellent cycle stability, and reduced Effect of Calcination Time

Inactive Publication Date: 2012-03-28
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Domestic Wang Zhixing et al. (Chinese Journal of Nonferrous Metals, 2008, 18(4): 660-665) used LiMnPO synthesized by solid phase method 4 The capacity is only 95mAh / g, and the process is relatively cumbersome. The method of secondary ball milling is used, and the cost is high
Yang Ping and others (Power Technology, 2005, 29(11): 755-757), LiFe was prepared by doping with different contents of Fe 1-x mn x PO 4 Materials, synthesized samples LiFe 0.4 mn 0.6 PO 4 The capacity of the material is only 60mAh / g, and the voltage platform is also reduced
And the patent CN 101673819A uses MnPO 4 to prepare LiMnPO 4 materials, the modification process is complex and the cycle is long

Method used

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  • Preparing method of anode material of lithium ion battery
  • Preparing method of anode material of lithium ion battery
  • Preparing method of anode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the stoichiometric ratio, lithium carbonate, manganese acetate, ammonium dihydrogen phosphate, and vanadium pentoxide are mixed in a molar ratio of 1.05: 1.8: 2: 0.1, and put into a polyurethane ball mill tank (ball feed) that has zirconia balls added. The mass ratio is 20:1), and adding Li 1.05 mn 0.9 V 0.1 PO 4The mass of 10% sucrose was used as carbon source, and the sol was obtained after ball milling in water for 5 hours. The precursor is dried by a spray drying method to obtain precursor powder. Finally, the precursor powder was heated at a heating rate of 10 °C / min in an argon atmosphere, and then calcined at a constant temperature of 500 °C for 10 hours, and then cooled to room temperature with the furnace temperature, and the prepared Li 1.05 mn 0.9 V 0.1 PO 4 / C powder.

[0027] Will Li 1.05 mn 0.8 V 0.1 PO 4 / C sample conductive agent acetylene black and adhesive PVDF are mixed in a mass ratio of 80:10:10, and an appropriate amount of...

Embodiment 2

[0030] According to the stoichiometric ratio, lithium carbonate, manganese acetate, ammonium dihydrogen phosphate, and vanadium pentoxide are mixed in a molar ratio of 1.05: 1.8: 2: 0.1, and put into a polyurethane ball mill tank (ball feed) that has zirconia balls added. The mass ratio is 20:1), and adding Li 1.05 mn 0.9 V 0.1 PO 4 The mass of 20% sucrose was used as carbon source, and the sol was obtained after ball milling in water for 5 hours. The precursor is dried by a spray drying method to obtain the precursor powder. Finally, the precursor powder was heated up at a heating rate of 10 °C / min in an argon or nitrogen atmosphere, and calcined at a constant temperature of 600 °C for 15 hours, and then cooled to room temperature with the furnace temperature, and the prepared Li 1.05 mn 0.9 V 0.1 PO 4 / C powder. figure 1 The X-ray diffraction analysis results show that the prepared lithium manganese phosphate powder is olivine-type Li 1.05 mn 0.9 V 0.1 PO 4 / C si...

Embodiment 3

[0033] According to the stoichiometric ratio, lithium carbonate, manganese acetate, ammonium dihydrogen phosphate, and vanadium pentoxide are mixed in a molar ratio of 1.05: 1.8: 2: 0.1, and put into a polyurethane ball mill tank (ball feed) that has zirconia balls added. The mass ratio is 20:1), and adding Li 1.05 mn 0.9 V 0.1 PO 4 The mass of 30% glucose was used as carbon source, and the sol was obtained after ball milling in water for 5 hours. The precursor is dried by a spray drying method to obtain the precursor powder. Finally, the precursor powder was heated up at a heating rate of 10 °C / min in an argon or nitrogen atmosphere, and calcined at a constant temperature of 600 °C for 15 hours, and then cooled to room temperature with the furnace temperature, and the prepared Li 1.05 mn 0.9 V 0.1 PO 4 / C powder.

[0034] Taking the same battery preparation process and test method as in Example 1, the present invention produces Li 1.05 mn 0.9 V 0.1 PO 4 The / C mat...

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Abstract

The invention discloses a preparing method of an anode material of a lithium ion battery. Lithium carbonate, manganese acetate, ammonium dihydrogen phosphate and vanadium pentoxide are mixed according to stoichiometric ratio, certain quantity of carbon resources are added, the ball-milling is conducted by a water medium for a certain period to obtain sol, and the sol is sprayed to be dried to obtain a presoma. The presoma is calcined for 10-20h at the temperature of 500-600DEG C by inert gases, and is cooled naturally to obtain the material being Li1.05Mn0.9V0.1PO4 / C. In the method, a technology combining a sol gelling method with a high-temperature solid phase method is adopted, so that the mixing uniformity of the materials can be improved, the calcining time can be shortened, the purity of a sample can be improved, and the cost can be saved simultaneously. The impurities in the obtained material are less, the grain size is smaller than 1 micron, the electrochemical performance is more excellent, the discharge capacity at multiplying power being 0.1C can reach 146mAh / g, and the circulating performance is good with the effect of being maintained above 60% after 50 times of circulation, so that the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to a preparation method of a positive electrode material of a lithium ion battery, in particular to a method for preparing lithium manganese phosphate, a positive electrode material of a lithium ion battery doped with vanadium, by a process combining a sol-gel method and a high-temperature solid-phase method. Background technique [0002] With the rapid development of information technology, aerospace technology and military, the demand for small discrete mobile power sources is growing rapidly. At the same time, in order to meet the needs of low-carbon economic development, it is urgent to develop an efficient, clean, economical and safe energy system. Traditional secondary batteries, such as lead-acid batteries, nickel-metal hydride batteries, nickel-cadmium batteries, etc. are difficult to meet these requirements. Since the successful development and commercialization of lithium-ion batteries by Sony Corporation of Japan in 199...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 徐宁吕菲李磊吴孟涛
Owner TIANJIN B&M SCI & TECH
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