期刊
ADVANCED MATERIALS
卷 33, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202006629
关键词
charge storage mechanism; CoO; lithium‐ ion batteries; operando magnetometry
类别
资金
- National Natural Science Foundation of China [51804173, 11504192, 11434006, 51673103, 51973100]
- National Basic Research Program of China [2015CB921502]
- National Key Research Development Project [2019YFC0121402, 2017YFA0303604]
- Shandong Provincial Natural Science Foundation [ZR2018BB030, ZR2020MA073]
- Youth Innovation Promotion Association of CAS [2018008]
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-04178]
- Canada First Research Excellence Fund
- Welch Foundation [F-1861]
- Sloan Research Fellowship
- Camille Dreyfus Teacher-Scholar award
Research has found that cobalt oxide has larger storage capacity in lithium-ion batteries. The anomalous capacity is associated with the formation of a spin capacitor and the growth of a polymeric film. Operando magnetometry technology provides direct evidence of the catalytic role of metallic cobalt in assisting the polymeric film formation.
Cobalt oxide (CoO) is a promising electrode for high-energy-density Li-ion batteries (LIBs), where the charge storage is believed to take place solely during the electrochemical oxidation/reduction processes. However, this simple picture has been increasingly challenged by reported anomalously large storage capacities, indicating the existence of undiscovered extra charge reservoirs inside the system. Here, an advanced operando magnetometry technology is employed to monitor the magnetization variation of the CoO LIBs in real time and, in this particular system, it is clearly demonstrated that the anomalous capacity is associated with both the reversible formation of a spin capacitor and the growth of a polymeric film at low voltages. Furthermore, operando magnetometry provides direct evidence of the catalytic role of metallic Co in assisting the polymeric film formation. These critical findings help pave the way for better understanding of the charge storage mechanisms of transition-metal oxides and further utilizing them to design novel electrode materials.
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