Negative electrode material including lead fluoride coated active material and electrolyte battery using same
One aspect of the invention provides a negative electrode material for use in an electrolyte battery including a negative electrode active material and a coating material disposed on a surface of the negative electrode active material. The coating material is a fluoride ion conductor that includes the elements lead and fluorine.
1. A negative electrode material for a lithium ion battery, comprising:
a graphitic carbon material as a negative electrode active material for the lithium ion battery, and
a coating material disposed on a surface of graphitic carbon material, wherein the coating material is a fluoride ion conductor that includes lead, tin, and fluorine,
the fluoride ion conductor includes a solid solution of the following formula (1):
Pb (1-x) Sn x F 2+δ (1),
wherein, in formula (1), x satisfies 0<x≤0.6 and δ is a real number that achieves charge neutrality.
2. The negative electrode material according to claim 1 , wherein the graphitic carbon material is approximately spherical with an average aspect ratio of 1 or more and 1.5 or less.
3. The negative electrode material according to claim 1 , wherein x satisfies 0<x≤0.2.
4. The negative electrode material according to claim 1 , wherein the coating material has an average coating thickness of at least 10 nm and up to 100 nm.
5. The negative electrode material according to claim 1 , wherein a plurality of dots comprising said coating material are arranged on the surface of graphitic carbon material.
6. A lithium ion battery comprising:
a positive electrode, a negative electrode, and an electrolyte, wherein
the negative electrode includes a negative electrode material according to claim 1 , and
the electrolyte includes a fluorine-containing solvent.