Nonaqueous electrolyte secondary battery
A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of negative electrode active material falling off and battery cycle characteristics degradation
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Embodiment 1～4 and comparative example 1～3
[0048] As the non-aqueous electrolyte secondary batteries of Examples 1 to 4 and Comparative Examples 1 to 3, the following material was used as the negative electrode active material, that is, the coating amount of amorphous carbon was kept constant at 1% by mass, and the entire negative electrode was active Composition in the substance is that the addition amount of silicon oxide of SiO (x=1) is constant at 3.5 mass %, makes the graphite that is not coated with amorphous carbon in the ratio of 100~0 mass % (as amorphous carbon A material in which the ratio of coated graphite is varied from 0 to 100% by mass. For each of the above-mentioned batteries, the results of measuring the initial capacity, battery thickness increase, and cycle characteristics as described above are summarized in Table 1 together with the composition of the respective negative electrode active materials.
[0049] [Table 1]
[0050]
[0051] *: 1% by mass of amorphous carbon coated graphite
[0052...
Embodiment 5～7 and comparative example 4、5
[0054] As the non-aqueous electrolyte secondary batteries of Examples 5 to 7 and Comparative Examples 4 and 5, the following materials were used as the negative electrode active material, that is, the coating amount of amorphous carbon was constant at 1% by mass, and the The proportion of graphite that is not coated with amorphous carbon is constant at 80% by mass (the ratio of graphite coated with amorphous carbon is 20% by mass), and the composition in the entire negative electrode active material is SiO (x=1) The amount of silicon oxide added varies from 0.5 to 25% by mass. For each of the above-mentioned batteries, the results of measuring the initial capacity, battery thickness increase, and cycle characteristics as described above are summarized in Table 2 together with the composition of the respective negative electrode active materials.
[0055] [Table 2]
[0056]
[0057] *: 1% by mass of amorphous carbon coated graphite
[0058] From the results shown in Table ...
Embodiment 8～11
[0061] As the non-aqueous electrolyte secondary battery of Examples 8-11, the following material is used as the negative electrode active material, that is, the proportion of graphite not coated with amorphous carbon in all graphite is constant at 80% by mass (in the form of amorphous The proportion of carbon-coated graphite is 20% by mass), the addition of silicon oxide consisting of SiO (x=1) in all negative electrode active materials is constant at 3.5% by mass, and the coating amount of amorphous carbon is It varies from 0.1 to 6.5% by mass. For each of the above-mentioned batteries, the results of measuring the initial capacity, battery thickness increase, and cycle characteristics as described above are summarized in Table 3 together with the composition of the respective negative electrode active materials. In addition, in Table 3, the measurement result of the battery of Example 1 is also recorded together.
[0062] [table 3]
[0063]
[0064] *: Amorphous carbon ...
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