Journal
JOURNAL OF POWER SOURCES
Volume 373, Issue -, Pages 20-30Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.10.084
Keywords
Lithium-ion capacitors; Pre-litluation; Hybrid capacitor; Additives; Activated carbon; Tris (trimethylsilyl) phosphate
Funding
- United States Army Research Laboratory postdoctoral program
- Army Research Laboratory
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Lithium-ion capacitors (LICs) were investigated for high power, moderate energy density applications for operation in extreme environments with prolonged cycle-life performance. The LICs were assembled as three layered pouch cells in an asymmetric configuration employing Faradaic pre-lithiated hard carbon anodes and non-Faradaic ion adsorption-desorption activated carbon (AC) cathodes. The capacity retention was measured under high stress conditions, while the design factor explored was electrolyte formulation using a set of carbonates and electrolyte additives, with a focus on their stability. The LIC cells were evaluated using critical performance tests under the following high stress conditions: long-term voltage floating-cycling stability at room temperature (2.2-3.8 V), high temperature storage at 3.8 V, and charge voltages up to 4.4 V. The rate performance of different electrolytes and additives was measured after the initial LIC cell formation for a 1C-10C rate. The presence of vinylene carbonate (VC) and tris (trimethylsilyl) phosphate (TMSP) were found to be essential to the improved electrochemical performance of the LIC cells under all testing conditions.
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