Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 158, Issue 3, Pages A352-A355Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3536619
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Funding
- King Abdullah University of Science and Technology (KAUST)
- Global Climate and Energy Project (GCEP) at Stanford
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Lithium-ion batteries that use aqueous electrolytes offer safety and cost advantages when compared to today's commercial cells that use organic electrolytes. The equilibrium reaction potential of lithium titanium phosphate is -0.5 V with respect to the standard hydrogen electrode, which makes this material attractive for use as a negative electrode in aqueous electrolytes. This material was synthesized using a Pechini type method. Galvanostatic cycling of the resulting lithium titanium phosphate showed an initial discharge capacity of 115 mAh/g and quite good capacity retention during cycling, 84% after 100 cycles, and 70% after 160 cycles at a 1 C cycling rate in an organic electrolyte. An initial discharge capacity of 113 mAh/g and capacity retention of 89% after 100 cycles with a coulombic efficiency above 98% was observed at a C/5 rate in pH-neutral 2 M Li2SO4. The good cycle life and high efficiency in an aqueous electrolyte demonstrate that lithium titanium phosphate is an excellent candidate negative electrode material for use in aqueous lithium-ion batteries. (C) 2011 The Electrochemical Society. [DOI:10.1149/1.3536619] All rights reserved.
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