Non-aqueous electrolyte secondary battery
View Patent ↗A non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, a non-aqueous electrolyte, and a separator, wherein the positive electrode includes a positive electrode current collector and a positive electrode material mixture layer formed on one or both sides of the positive electrode current collector, the positive electrode material mixture layer has a thickness greater than 80 μm per side of the positive electrode current collector, the positive electrode material mixture layer includes a positive electrode active material, the positive electrode active material is composed of secondary particles formed by aggregation of primary particles, the secondary particles have an average particle size of 6 μm or less, and, when diffraction-line integrated intensities of the (003) plane and the (104) plane in an X-ray diffraction chart of the positive electrode material mixture layer are I003 and I104, respectively, the ratio I003/I104 of the integrated intensities is 1.1 or more.
1. A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a non-aqueous electrolyte, and a separator,
wherein the positive electrode comprises a positive electrode current collector and a positive electrode material mixture layer formed on one or both sides of the positive electrode current collector,
the positive electrode material mixture layer has a thickness of 100 μm or more and 300 μm or less per side of the positive electrode current collector,
the positive electrode material mixture layer includes a positive electrode active material,
the positive electrode active material comprises a lithium-containing composite oxide obtained by baking under an oxygen gas atmosphere after preheating,
the lithium-containing composite oxide is represented by a general compositional formula: Li 1+x MO 2 ,
where x is in the range of −0.5≦x≦0.5, and M comprises Ni and at least one selected from Co and Mn,
20≦a<100 and 50≦a+b+c≦100 are satisfied when the ratios of Ni, Co, and Mn to all the elements constituting M are a, b, and c, respectively, in units of mol %, and
the ratio of elements other than Ni, Co, and Mn to all the elements constituting M is 2.0 mol % or less,
the positive electrode active material is composed of secondary particles formed by aggregation of primary particles,
an average particle size of the secondary particles is 6 μm or less,
when an average particle size of the primary particles is A and the average particle size of the secondary particles is B, A/B is 0.1 or less,
when diffraction-line integrated intensities of a (003) plane and a (104) plane in an X-ray diffraction chart of the positive electrode material mixture layer are I 003 and I 104 , respectively, the ratio I 003 /I 104 of the integrated intensities is 1.1 or more,
the positive electrode material mixture layer contains an organosilane compound represented by a general formula X 1 —Si(OR 1 ) 3 or X 2 —SiR 2 (OR 2 ) 2 , where R 1 , R 2 , and R 3 represent —CH 3 , —C 2 H 5 , or —C 3 H 7 , R 2 and R 3 may be the same or different, and X 1 and X 2 are selected from the group consisting of a vinyl group, an epoxy group, a styryl group, a methacryloxy group, an acryloxy group, an amino group, a ureido group, a chloropropyl group, a mercapto group, a sulfide group, and an isocyanate group, and
the organosilane compound content is 0.05 to 3.0 mass % relative to the total mass of the positive electrode material mixture layer.
2. The non-aqueous electrolyte secondary battery according to claim 1 ,
Wherein the lithium-containing composite oxide contains, as constituent elements, nickel and at least one selected from cobalt and manganese and has a layered structure.