A battery capable of improving the energy density and cycle characteristics is provided. A cathode active material layer contains a complex oxide containing Li and Co as a cathode active material. An anode active material layer contains a CoSnC containing material containing Sn, Co, and C as an element, in which the content of C is from 16.8 wt % to 24.8 wt %, and the ratio of Co to the total of Sn and Co is from 30 wt % to 45 wt % as an anode active material. The surface density ratio of the cathode active material layer to the anode active material layer (surface density of the cathode active material layer/surface density of the anode active material layer) is from 2.77 to 3.90.
1. A battery comprising:
a cathode having a cathode active material layer; and
an anode having an anode active material layer,
wherein the cathode active material layer contains a complex oxide containing lithium and cobalt,
the anode active material layer contains a material containing tin, cobalt, and carbon, in which the carbon content is from about 16.8 wt % to about 24.8 wt %, and ratio of cobalt to a total of tin and cobalt is from about 30 wt % to about 45 wt %, and a half value width of a diffraction peak obtained by X-ray diffraction of the anode active material is about 1° or more, and
a surface density ratio of the cathode active material layer to the anode active material layer from about 2.77 to about 3.90.
2. The battery of claim 1 , wherein the material containing tin, cobalt and carbon further contains an element selected from the group consisting of silicon, iron, nickel, chromium, indium, niobium, germanium, titanium, molybdenum, aluminum, phosphorous, gallium and bismuth.
3. The battery of claim 1 , wherein the carbon in the material containing tin, cobalt and carbon is bonded with a metal element or a metalloid element.
4. The battery of claim 1 , wherein for the material containing tin, cobalt and carbon, a peak of C1s obtained using X-ray Photoelectron Spectroscopy is lower than 284.5 eV.