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Phase Transition Driven Zn-Ion Battery With Laser-Processed V2C/V2O5 Electrodes for Wearable Temperature Monitoring.

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Researchers developed a novel vanadium carbide MXene/vanadium pentoxide cathode for aqueous zinc-ion batteries. This breakthrough offers a 150% capacity enhancement over 60,000 cycles, ideal for stable, flexible wearable electronics.

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aqueous zinc ion batterycyclic stabilitytemperature sensorvanadium carbidevanadium oxidewearable bioelectronics

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Wearable Electronics

Background:

  • Flexible power supplies are crucial for wearable bioelectronics in the Internet of Things.
  • Aqueous zinc-ion batteries offer a safe and viable power source for flexible electronics.
  • Conventional batteries suffer from performance degradation due to unfavorable electrode phase transitions.

Purpose of the Study:

  • To develop a high-capacity and ultrastable cathode material for aqueous zinc-ion batteries.
  • To engineer a novel vanadium carbide MXene/vanadium pentoxide heterostructure.
  • To demonstrate the potential of this battery for real-time wireless body temperature monitoring.

Main Methods:

  • Fabrication of a V2C/V2O5 heterostructure cathode via laser writing from V2AlC.
  • Electrochemical testing of the cathode in aqueous zinc-ion battery configuration.
  • Construction and integration of a series-connected battery with a temperature sensor for a wearable device.

Main Results:

  • Achieved an extraordinary capacity enhancement of 150%.
  • Demonstrated exceptional cycling stability, sustained over 60,000 cycles.
  • Identified delamination of V2C MXene and favorable phase transitions as key mechanisms for stability.

Conclusions:

  • The V2C/V2O5 heterostructure cathode significantly enhances zinc-ion battery performance and longevity.
  • Rational electrode design is critical for advancing stable power sources in wearable bioelectronics.
  • The developed battery is suitable for practical applications like wireless body temperature monitoring.