US 12,315,921 B2
Non-aqueous electrolyte secondary battery and method for manufacturing same
Hiroyuki Yamaguchi, Toyota (JP); and Masataka Tomita, Okazaki (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed by Prime Planet Energy & Solutions, Inc., Tokyo (JP)
Filed on Apr. 11, 2022, as Appl. No. 17/717,137.
Claims priority of application No. 2021-067927 (JP), filed on Apr. 13, 2021.
Prior Publication US 2022/0328819 A1, Oct. 13, 2022
Int. Cl. H01M 4/505 (2010.01); H01M 4/02 (2006.01); H01M 4/36 (2006.01); H01M 4/583 (2010.01); H01M 10/0525 (2010.01); H01M 10/0568 (2010.01); H01M 10/0569 (2010.01)
CPC H01M 4/505 (2013.01) [H01M 4/366 (2013.01); H01M 4/583 (2013.01); H01M 10/0525 (2013.01); H01M 10/0568 (2013.01); H01M 10/0569 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 2300/0028 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolytic solution, wherein
the positive electrode includes a positive electrode active material layer containing a positive electrode active material;
the positive electrode active material includes a lithium composite oxide having a spinel-type crystal structure and including Mn;
the negative electrode includes a negative electrode active material layer containing a negative electrode active material;
the negative electrode active material is graphite;
the non-aqueous electrolytic solution includes a fluorine-containing lithium salt;
the positive electrode active material has a coating film on the surface thereof;
at least a part of the coating film has a multi-layer structure including a first layer and a second layer located on the first layer;
in the first layer, the ratio of the content (atomic %) of P element to the total content (atomic %) of P element and F element determined by scanning transmission electron microscopy/energy dispersive X-ray analysis is 67% or more; and
in the second layer, the ratio of the content (atomic %) of F element to the total content (atomic %) of P element and F element determined by scanning transmission electron microscopy/energy dispersive X-ray analysis is 38% or more.