Non-aqueous secondary battery
View Patent ↗A negative electrode active material of a non-aqueous secondary battery of the present invention includes a first active material, a second active material, and a third active material. The first active material is a carbon material having a D/G ratio of 0.15 or less, where G represents the peak intensity observed in a Raman spectrum from 1578 to 1592 cm −1 and D represents the peak intensity observed in a Raman spectrum from 1349 to 1353 cm −1 of Raman spectroscopy. The D50 of the second active material is 10 μm or less. The second active material includes at least one of a first carbon material having the D/G ratio of 0.2 to 2.0 and a second carbon material having the D/G ratio of 1.0 to 2.0. The D50 of the third active material is 5 μm or less. The third active material contains silicon and oxygen as constituent elements.
1. A non-aqueous secondary battery comprising:
a positive electrode;
a negative electrode;
a non-aqueous electrolyte; and
a separator,
wherein the positive electrode comprises a positive electrode mixture layer that includes a positive electrode active material,
the positive electrode mixture layer has a thickness of 70 to 300 μm per one side,
the negative electrode comprises a negative electrode mixture layer that includes a negative electrode active material and a binder,
the negative electrode mixture layer has a density of 1.4 g/cm 3 or less,
the negative electrode active material includes a first active material, a second active material, and a third active material,
D50 of the first active material is 15 μm to 20 μm,
the first active material is a carbon material having a D/G ratio of 0.15 or less, where G represents a peak intensity observed in a Raman spectrum from 1578 to 1592 cm −1 and D represents a peak intensity observed in a Raman spectrum from 1349 to 1353 cm −1 of Raman spectroscopy,
D50 of the second active material is 10 μm or less,
the second active material includes at least one of a first carbon material having the D/G ratio of 0.2 to 2.0 and a second carbon material having the D/G ratio of 1.0 to 2.0,
D50 of the third active material is 5 μm or less,
the third active material contains silicon and oxygen as constituent elements,
a content of the first active material is 10 wt % to 57 wt % of a total weight of the negative electrode active material,
a content of the third active material is 1 wt % to 10 wt % of the total weight of the negative electrode active material, and
when the second active material includes the second carbon material, a content of the second carbon material is 40 wt % or less of the total weight of the negative electrode active material.
2. The non-aqueous secondary battery according to claim 1 , wherein electric capacity per unit area of one side of the positive electrode mixture layer is 3 mAh/cm 2 or more.
3. The non-aqueous secondary battery according to claim 1 , wherein the negative electrode mixture layer further includes a vapor grown carbon fiber having a fiber length of 10 μm to 20 μm, and a carbon material having a specific surface area of 13 m 2 /g or less and an oil absorption value of 1.5 mL/g or less.
4. The non-aqueous secondary battery according to claim 1 , wherein the binder includes fluorocarbon rubber made of a polymer that includes at least one monomer unit selected from tetrafluoroethylene and hexafluoropropylene.