A rechargeable Li-O2 battery using a lithium nitrate/N,N-dimethylacetamide electrolyte.
A major challenge in the development of rechargeable Li-O(2) batteries is the identification of electrolyte materials that are stable in the operating environment of the O(2) electrode. Straight-chain alkyl amides are one of the few classes of polar, aprotic solvents that resist chemical degradation in the O(2) electrode, but these solvents do not form a stable solid-electrolyte interphase (SEI) on the Li anode. The lack of a persistent SEI leads to rapid and sustained solvent decomposition in the presence of Li metal. In this work, we demonstrate for the first time successful cycling of a Li anode in the presence of the solvent, N,N-dimethylacetamide (DMA), by employing a salt, lithium nitrate (LiNO(3)), that stabilizes the SEI. A Li-O(2) cell containing this electrolyte composition is shown to cycle for more than 2000 h (>80 cycles) at a current density of 0.1 mA/cm(2) with a consistent charging profile, good capacity retention, and O(2) detected as the primary gaseous product formed during charging. The discovery of an electrolyte system that is compatible with both electrodes in a Li-O(2) cell may eliminate the need for protecting the anode with a ceramic membrane.
Liox Power, Inc., 129 North Hill Avenue, Suite 103, Pasadena, California 91106, USA. wes@liox.com
Wesley
W
Walker
Vincent
V
Giordani
Jasim
J
Uddin
Vyacheslav S
VS
Bryantsev
Gregory V
GV
Chase
Dan
D
Addison
D000081:Acetamides / Q000737:chemistry*; D011211:Electric Power Supplies; D004573:Electrolytes / Q000737:chemistry; D008094:Lithium / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*
D000081:Acetamides; D004573:Electrolytes; D009566:Nitrates; D008094:Lithium; C013959:dimethylacetamide; D010100:Oxygen