Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 1, Pages 1472-1478Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp207919q
Keywords
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Funding
- NSF [1000726]
- General Motors
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1000726] Funding Source: National Science Foundation
- EPSCoR
- Office Of The Director [814194] Funding Source: National Science Foundation
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The potentiostatic intermittent titration technique (PITT) is one of the widely used methods for determining the diffusion coefficient in electrochemical materials, such as lithium diffusion in lithium-ion battery electrodes. The conventional PITT analysis neglects interfacial resistance and assumes, the system is diffusion-controlled. For real electrode systems, however, surface reaction as well as diffusion may be rate-limiting. In this Article, we analyze PITT measurements for material systems with finite surface reaction rates. For small amplitude potential steps, we derive analytic solutions for the measured transient current associated with PITT, taking into account the effects of finite surface reaction rates. Using the analytic solutions, the diffusion coefficient, surface reaction rate, and the exchange current density can be determined simultaneously. An example of lithium diffusion in amorphous silicon thin-film electrodes is used to demonstrate the enhanced PITT approach.
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