Non-aqueous electrolyte secondary cell
A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, non-aqueous electrolytes, etc. Low resistance, high capacity, and excellent cycle characteristics
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Embodiment 1
[0085] [Preparation of negative electrode material LSX]
[0086] Mix silicon dioxide and lithium carbonate in such a way that the atomic ratio: Si / Li becomes 1.05, and bake the mixture in air at 950°C for 10 hours to obtain the formula: Li 2 Si 2 o 5 Lithium silicate represented by (u=0.5). The obtained lithium silicate was pulverized so that the average particle diameter became 10 μm.
[0087] Lithium silicate (Li 2 Si 2 o 5 ) and raw silicon (3N, average particle diameter 10 μm) were mixed at a mass ratio of 45:55. The mixture was filled into a tank (made of SUS, volume: 500 mL) of a planetary ball mill (manufactured by Fritsch, P-5), 24 balls made of SUS (20 mm in diameter) were put in the tank, and the lid was closed, and the mixture was kept in an inert atmosphere. In the middle, the mixture was pulverized at 200 rpm for 50 hours.
[0088] Next, the powdery mixture was taken out in an inert atmosphere, and fired at 800° C. for 4 hours under pressure from a hot pre...
Embodiment 2～9
[0103] In the making of negative electrode, make the ratio that graphite accounts for in the sum total of LSX particle and graphite with conductive layer be the value shown in table 1, make the addition amount of the CMC-Na relative to negative electrode active material per 100 mass parts be table 1 The value shown in 1. In the preparation of electrolyte, make the concentration of LFSI in electrolyte and LiPF in electrolyte 6 The concentrations are the values shown in Table 1, respectively. Batteries A2 to A9 were produced in the same manner as in Example 1 except for the above.
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Abstract
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