期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 31, 页码 26328-26334出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b09131
关键词
thermal gradient; lithium plating; lithium dendrite; electrochemical impedance spectroscopy; impedance diagnostics; battery safety; thermal management
资金
- Office of Naval Research [N0001418WX00816]
- National Academy's NRC RAP program
Li-ion battery safety is often threatened by undesirable lithium metal electrodeposition or dendrite growth, during charging. The unpredictable and complex onset of widely ranging lithium morphologies limits reproducibility, making prevention and detection strategies difficult to assess. This work blends the fundamentals of classical metallurgical dendrite growth with traditional Li-ion battery charging, to prove the ability to modulate lithium metal deposition through an applied interelectrode thermal gradient. With NMC (nickel-manganese-cobalt) cathode warmed to 40 degrees C and graphite anode cooled to 0 degrees C, irreversible lithium plating is observed within 10 cycles, and complete cell deactivation within 20 cycles. The stages of failure over these first 20 cycles are assessed with electrochemical impedance spectroscopy. This work provides a technique for accelerated aging and the reliable study of lithium deposition in Li-ion batteries.
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