Method for preparing in-situ carbon coated manganese carbonate for negative electrode of lithium ion battery
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A technology of carbon-coated manganese carbonate and carbon-coated manganese carbonate materials, which are applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of improving cycle stability, low production cost, and high purity
Active Publication Date: 2016-08-03
SHANDONG UNIV +1
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[0004] The object of the present invention is exactly in order to solve the above-mentioned problems, provide a kind of method of one-step in situ preparation carbon-coated manganese carbonate for negative electrode of lithium ion battery, the preparation raw material of this method is cheap and easy to get, simple operation, less energy consumption, no pollution, the obtained The manganese carbonate carbon coating is uniform, the particle size distribution is uniform, and the purity is high, which can effectively prevent the particle collapse during the charge and discharge process of manganese carbonate and improve the cycle stability of lithium-ion batteries.
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Embodiment 1
[0029] (1) Prepare a potassium permanganate solution with a concentration of 0.25 mol / L, stir and disperse;
[0030] (2) Prepare 0.1 mol / L glucose solution, stir and disperse;
[0031] (3) Add the above-mentioned glucose solution to the potassium permanganate solution, stir and disperse, and ultrasonic treatment 22 Hz, the treatment time is 5 minutes;
[0032] (4) Add the dispersed solution to the reactor and heat it to 180°C for 6 hours;
[0033] (5) The heated reactor is naturally cooled to room temperature, cleaned, and dried to obtain a powder.
[0034] Get the powder test results:
[0035] SEM topography like figure 1 As shown in the figure, the carbon-coated manganese carbonate crystal is in the shape of a spindle, the surface carbon layer is evenly coated, and the crystal size distribution is uniform; the TEM appearance is as figure 2 As shown, the carbon-coated manganese carbonate crystals are in the shape of a spindle. It can be clearly seen that the manganese carbonate crystal...
Embodiment 2
[0038] (1) Prepare a potassium permanganate solution with a concentration of 0.04 mol / L, stir and disperse;
[0039] (2) Prepare 0.02 mol / L oxalic acid solution, stir and disperse;
[0040] (3) Add the above-mentioned oxalic acid solution to the potassium permanganate solution, stir and disperse, ultrasonic treatment 15Hz, the treatment time is 20 minutes;
[0041] (4) Add the dispersed solution to the reaction kettle and heat to 120°C for 10 hours;
[0042] (5) The heated reactor is naturally cooled to room temperature, cleaned, and dried to obtain a powder.
[0043] Get the powder test results:
[0044] SEM topography like image 3 As shown in the figure, the carbon-coated manganese carbonate crystal is a square with a regular shape, the surface carbon layer is evenly coated, and the crystal size distribution is uniform; the TEM appearance is as Figure 4 As shown, the carbon-coated manganese carbonate crystal presents a square with a regular shape. It can be clearly seen that the man...
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Abstract
The invention discloses a one-step method for in-situ preparation of carbon coated manganese carbonate for the negative electrode of a lithium ion battery .The method specifically comprises the steps of 1, preparing potassium permanganate solution of certain concentration and carbon source solution of certain concentration respectively, wherein the molar concentration ratio of the carbon source solution to the potassium permanganate solution is 1:(2-2.5); 2, adding the carbon source solution to the potassium permanganate solution, and conducting stirring dispersion and ultrasonic treatment in sequence; 3, adding dispersed solution into a reaction still to be heated for 3-24 h at the temperature of 120-180 DEG C; 4, naturally cooling the reaction still to room temperature, and conducting cleaning and drying to obtain powder, namely the in-situ carbon coated manganese carbonate for the negative electrode of a lithium ion battery .Raw materials for preparation are cheap and easy to obtain, operation is easy, energy consumption is low, pollution is avoided, carbon coating of the obtained manganese carbonate is uniform, size distribution is uniform, purity is high, particle collapse during charging and discharging of manganese carbonate can be effectively prevented, and the cycling stability of the lithium ion battery is improved.
Description
Technical field [0001] The invention relates to the technical field of battery materials, in particular to a preparation method of in-situ carbon-coated manganese carbonate for lithium ion battery negative electrodes. Background technique [0002] With the vigorous development and wider application of lithium-ion batteries, the market has put forward higher requirements for its portability and energy density. As an important part of lithium-ion batteries, the influence of anode materials on performance is very important. However, the existing commercial anode material carbon anode has been difficult to meet such requirements, so research and modification of various alternative anode materials is an important method to solve this problem. [0003] At present, anode materials can be divided into three types from the perspective of lithium storage mechanism: insertion type, alloy type and conversion type. Compared with alloy type and insertion type electrodes, the conversion type ne...
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