Preparation method of biomass carbon/sodium manganese polyfluorophosphate composite material and application thereof
A technology of sodium polyfluoromanganese phosphate and composite materials, which is applied in the direction of active material electrodes, electrochemical generators, electrical components, etc., can solve the problems of polluting the environment and wasting resources, and achieves small charge migration resistance, large specific capacity, and preparation The method is simple and feasible
Inactive Publication Date: 2020-04-14
GUILIN UNIVERSITY OF TECHNOLOGY
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[0006] The south of my country is the main sugar-producing area. Bagasse is the main by-product of the sugar industry, and its resources are very rich. However, only a small amount of bagasse is currently used for board making, papermaking, and crop cultivation. Most of the bagasse is directly used as fuel, which pollutes the environment and wastes resources
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[0024] (1) Soak the bagasse in 5% sodium hydroxide solution, heat at 80°C for 2 hours, then soak at room temperature for another 4 hours, take out the bagasse, wash it with distilled water until the pH of the solution is neutral The bagasse is dried in a blast drying oven, and the dried bagasse is put into a sealed grinder and ground into 300-400 mesh powder, which is used as a carbon source for use.
[0025] (2) Weigh 2.4509 grams of manganese acetate hydrate (Mn(CH 3 COO) 2 4H 2 O), 0.4199 grams of sodium fluoride (NaF), 1.1502 grams of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and 1.3608 grams of sodium acetate (NaCH 3 COO·3H 2 O), add 0.5382 g of the carbon source obtained in step (1), add 20 mL of absolute ethanol as a dispersant, and after ball milling for 6 h, obtain a rheological phase slurry, place the rheological phase slurry obtained after grinding at 65 °C blast oven for 5 h to obtain the precursor powder.
[0026] (3) Transfer the precursor powder obt...
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The invention discloses a preparation method of a biomass carbon / sodium manganese polyfluorophosphate composite material and an application thereof. The method comprises the following steps: soaking bagasse in a sodium hydroxide solution with the mass percent concentration of 5%; preparing a carbon source, ball-milling hydrated manganese acetate, sodium fluoride, ammonium dihydrogen phosphate, sodium acetate and the carbon source in absolute ethyl alcohol through a ball-milling method to prepare rheological phase slurry, and calcining the rheological phase slurry through an in-situ pyrolysis method to prepare the biomass carbon / sodium manganese polyfluorophosphate composite material. The biomass carbon / sodium manganese polyfluorophosphate composite material is used as a lithium ion batterypositive electrode material. The preparation method has the advantages that the surfaces of the sodium manganese polyfluorophosphate particles are coated with the carbon layers, so that the defect that the rate capability and the cycle performance of sodium manganese polyfluorophosphate cannot be greatly improved due to the fact that a sodium manganese polyfluorophosphate pure phase is firstly prepared and then biochar generated by high-temperature carbonization is added to prepare the composite material can be well overcome.
Description
technical field [0001] The invention belongs to the field of positive electrode materials of lithium ion batteries, and in particular relates to a preparation method and application of a biomass carbon / sodium manganese polyfluorophosphate composite material. Background technique [0002] Lithium-ion batteries have become a research hotspot for power batteries due to their ultra-high energy density and the ability of lithium metal to be recharged repeatedly. Traditional lithium-ion batteries use lithium alloy metal oxides as cathode materials, but the performance of cathode materials varies greatly due to different configuration elements, which hinders the rapid development of lithium-ion batteries. With the development of science and technology and the increasing demand for energy storage equipment, the requirements for the specific capacity and service life of lithium-ion batteries are also getting higher and higher. At the current research level, the traditional lithium-i...
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Login to View More IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 刘峥李伟艾慧婷梁秋群程夏邢淋慧周含子
Owner GUILIN UNIVERSITY OF TECHNOLOGY