Patent ID: 11888160
Assignee: KABUSHIKI KAISHA TOSHIBA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  C  Y | IPC B  C  H

Claim 0:
1. A secondary battery, comprising:
a liquid electrolyte;
a positive electrode; and
a negative electrode comprising an active material containing layer that contains
active material particles capable of insertion and extraction of lithium ions, the active material particles comprising a niobium titanium oxide,
polymer fibers having an average fiber diameter of 1 nm to 100 nm, and
lithium-containing inorganic solid particles having lithium ion conductivity,
wherein the lithium-containing inorganic solid particles include a phosphate compound,
wherein the phosphate compound has a NASICON structure and is expressed as

Li1+yAlxM2−x(PO4)3,

wherein
M represents at least one element selected from the group consisting of Ti, Ge, Sr, Sn, Zr, and Ca,
x is not less than 0 and not more than 1, and
y is not less than 0 and not more than 1,

wherein a content of the polymer fibers in the active material containing layer ranges from 0.2 wt. % to 5 wt. %, and
wherein a content of the inorganic solid particles in the active material containing layer ranges from 0.5 wt. % to 10 wt. %,
wherein the polymer fibers are dispersed to form fine through holes in a mesh shape,
wherein the liquid electrolyte is held by the mesh shape of the polymer fibers in the active material containing layer.