Development of a rechargeable Li/SO₂ battery

摘要

Ballard Battery Systems Corporation is under contract to develop arechargeable, ambient temperature lithium battery for USAF missile siloapplications. The objective of this program is the demonstration of thetechnology in a hermetic cell with a capacity of at least 100 Ah. Thechemistry of the system is discussed as well as the objectives andstructure of the development program. This cell will ultimately bescaled-up to the 6000 Ah capacity required for the application. Theshort-term goal is the development, fabrication, and testing of 10 Ah,prismatic, welded cells. The chemistry selected for this program isbased on the reversible Li/SO₂ system. One variation of thischemistry packaged in a C_s configuration achieved a capacityof 1.4 Ah and a cycle life of 72, 30% depth-of-discharge cycles. Initialdevelopment efforts will focus on the negative electrode with theobjective of improving cycle life and safety