Electrode active material for all solid state secondary battery and all solid state secondary battery

摘要

An electrode active material for an all solid state secondary battery, which is able to have the controlled orientation of a crystal face at the interface between an electrode layer and an electrolyte layer in order to enhance the battery performance, and an all solid state secondary battery including the electrode active material. The electrode active material includes a carbon material having an intensity ratio (P002/P100) of 600 or less between the X-ray diffraction peak intensity P002 in the (002) plane and the X-ray diffraction peak intensity P100 in the (100) plane, which are obtained when a surface of a compact prepared by compression molding of a powder of the carbon material at a pressure of 110 MPa is irradiated with X-ray. The all solid state secondary battery includes a positive electrode, a negative electrode, and a solid electrolyte, and the negative electrode contains the electrode active material.

主权项

1. An all solid state secondary battery comprising:
a positive electrode consisting of first inorganic materials containing a sulfide; a negative electrode consisting of second inorganic materials; and a solid electrolyte containing Li, P, and S as constituent elements thereof between the positive electrode and the negative electrode, wherein the negative electrode contains an electrode active material comprising a compressed graphite having an intensity ratio (P002/P100) of 600 or less between a first X-ray diffraction peak intensity P002 in a (002) plane and a second X-ray diffraction peak intensity P100 in a (100) plane, the first and second X-ray diffraction peak intensities being obtained by irradiating a surface of a compact prepared by compression molding of a powder containing the graphite at a pressure of at least 110 MPa with X-ray.