Sodium molten salt battery
A technology of molten salt batteries and molten salt electrolytes, applied in molten electrolytes, battery electrodes, secondary batteries, etc., can solve the problem of low heat resistance and achieve stable battery capacity
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Embodiment 1
[0143] (1) Production of positive electrode
[0144] First, 85 parts by mass of NaCrO 2 (Positive electrode active material), 10 mass parts of acetylene black (conduction aid), and 5 mass parts of polyvinylidene fluoride (binding agent) are mixed together with N-methyl-2-pyrrolidone to prepare positive electrode mixture slurry . The resulting positive electrode mixture slurry was applied to the surface of an aluminum foil as a positive electrode current collector, dried, pressed, and vacuum dried at 150°C. Pressing was then performed to produce a disk-shaped positive electrode (diameter: 12 mm, thickness: 85 μm). The mass of the positive electrode active material per unit area of the obtained positive electrode is 13.3 mg / cm 2 . The reversible capacity per unit mass of the positive electrode of the positive electrode active material was 100 mAh / g.
[0145] (2) Production of negative electrode
[0146] (a) Preparation of negative electrode
[0147] First, 96 parts by m...
Embodiment 2
[0158] The positive electrode was manufactured as in Example 1, except that the mass of the positive electrode active material per unit area of the positive electrode was 6.7 mg / cm 2 The amount of the positive electrode mixture slurry applied was adjusted in a manner. A sodium molten salt battery (battery A2) was fabricated and evaluated as in Example 1 except that the resulting positive electrode was used. The ratio of the reversible capacity of the negative electrode to the reversible capacity of the positive electrode, that is, C n / C p for 2.
Embodiment 3
[0160] The negative electrode was manufactured as in Example 1, except that the mass of the negative electrode active material per unit area of the negative electrode was 6.3 mg / cm 2 The amount of the negative electrode mixture slurry applied was adjusted in such a manner that the pre-doping of sodium ions was performed in such an amount that the potential of the negative electrode was 0.3 V at 0% SOC. A sodium molten salt battery (battery A3) was manufactured and evaluated as in Example 1 except that the obtained negative electrode was used. When the pre-doped amount of sodium ions was converted into the capacity per unit mass of the negative electrode active material, it was found to be twice the irreversible capacity of the negative electrode active material. The ratio of the reversible capacity of the negative electrode to the reversible capacity of the positive electrode, that is, C n / C p is 1.
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