期刊
ANALYTICAL CHEMISTRY
卷 93, 期 43, 页码 14448-14453出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.1c02851
关键词
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资金
- Japan Science and Technology Corporation (JST) PRESTO [JPMJPR 18 T8]
- Japan Society for the Promotion of Science
- Ministry of Education, Culture, Sports, Science and Technology
- Asahi Glass Foundation of Japan
- Hokuriku Bank
- Murata Science Foundation
- Toyota Mobility Foundation (TMF)
- World Premier Research Center Initiative (WPI)
The research focuses on the impact of depth of discharge (DOD) on the charge/discharge performance of lithium-ion secondary batteries, using scanning electrochemical cell microscopy (SECCM) to detect the charge transfer resistance at the solid-liquid interface.
The discharged state affects the charge transfer resistance of lithium-ion secondary batteries (LIBs), which is referred to as the depth of discharge (DOD). To understand the intrinsic charge/discharge property of LIBs, the DOD-dependent charge transfer resistance at the solid-liquid interface is required. However, in a general composite electrode, the conductive additive and organic polymeric binder are unevenly distributed, resulting in a complicated electron conduction/ion conduction path. As a result, estimating the DOD-dependent rate-determining factor of LIBs is difficult. In contrast, in micro/nanoscale electrochemical measurements, the primary or secondary particle is evaluated without using a conductive additive and providing an ideal mass transport condition. To control the DOD state of a single LiFePO4 active material and evaluate the DOD-dependent charge transfer kinetic parameters, we use scanning electrochemical cell microscopy (SECCM), which uses a micropipette to form an electrochemical cell on a sample surface. The difference in charge transfer resistance at the solid-liquid interface depending on the DOD state and electrolyte solution could be confirmed using SECCM.
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