Anode active material for secondary battery, method for producing the same, and secondary battery including the same
A secondary battery and anode active technology, applied in nanotechnology for materials and surface science, secondary batteries, battery electrodes, etc., can solve problems such as low capacity, unfinished anode development, unsuitable for sodium ion intercalation, etc. To achieve the effect of high capacity characteristics
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[0053] In yet another aspect of the present disclosure, there is provided a method for preparing an anode active material for a sodium ion secondary battery comprising cobalt-tin spinel oxide represented by Chemical Formula 1 below, the preparation method including the following steps: (a) adding a precipitating agent to a precursor solution containing a cobalt precursor and a tin precursor to form a precipitate; and (b) subjecting the precipitate to filtration, drying and heat treatment:
[0054] [chemical formula 1]
[0055] co 2+x sn 1-x o 4
[0056] Wherein, x is a real number satisfying 0≤x≤0.9.
[0057] The drying can be carried out at 30°C to 100°C, preferably at 40°C to 90°C, more preferably at 50°C to 70°C, for 1 hour to 24 hours, preferably 8 hours to 16 hours, more preferably 10 hours to 14 hours.
[0058] According to one embodiment, the precipitating agent may be at least A sort of.
[0059] According to another embodiment, the heat treatment may be carrie...
Embodiment 1
[0062] Example 1: Co 2.4 sn 0.6 o 4 preparation of
[0063] At room temperature, 72 mL of 0.1 M CoSO 4 ·7H 2 O (sigma aldrich) aqueous solution, 18mL of 0.1M anhydrous SnCl 2 (Junsei chemical) aqueous solution, 3 mL of saturated HCl solution and 90 mL of ethanol were mixed for 30 minutes. Then, while stirring continuously, 92 mL of 0.1 M Na 2 C 2 o 4 (sigma aldrich) aqueous solution, and stirred and reacted to form a pink precipitate. The resulting precipitate was washed with distilled water and ethanol, and the precipitate was separated using a centrifuge. The separated precipitate was dried at 60°C for 12 hours and heated to 600°C in air at a heating rate of 5°C / min. Then, the temperature was maintained for 5 hours for heat treatment, thus providing Co 2.4 sn 0.6 o 4 .
Embodiment 2
[0064] Example 2: Manufacture of a coin-type half cell
[0065] First, the Co obtained from Example 1 2.4 sn 0.6 o 4 With super carbon, KS6 and polyacrylic acid (in H 2 35% by weight in O) was mixed in ethanol at a weight ratio of 6:1:1:2, and the resulting mixture was coated on a Cu foil to obtain an electrode. The thickness of the electrode obtained by using a roll pressing machine was 28 μm. The electrodes were dried in an oven at 80° C. for 4 hours before performing electrochemical tests.
[0066] Next, use the obtained Co 2.4 sn 0.6 o 4 Working electrode, Na counter electrode, glass separator and containing 1M NaClO dissolved in polyethylene carbonate (PC) organic solvent containing 2 wt% fluoroethylene carbonate (FEC) dissolved therein 4 Electrolyte, to assemble a coin-type half-cell (CR2032). Filled with H below 0.1ppm 2 O and O 2 The half-cell was fabricated in an argon glove box.
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