A solid state lithium carbon monofluoride battery includes an anode comprising Li, a solid electrolyte, and a cathode including CF.sub.x and LPS. The cathode can also include a carbon compound. The solid electrolyte can include LPS. The LPS can include .beta.-Li.sub.3PS.sub.4. The cathode LPS can include .beta.-Li.sub.3PS.sub.4. A method of making a battery is also disclosed.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
 This invention was made with government support under contract No. DE-AC05-00OR22725 awarded by the U.S. Department of Energy. The government has certain rights in this invention.