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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Electrosprayed Robust Graphene Layer Constructing Ultrastable Electrode Interface for High-Voltage Lithium-Ion

Guoqiang Zhang1,2, Kui Lin1,2, Xianying Qin1

  • 1Shenzhen Key Laboratory on Power Battery Safety Research and Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.

ACS Applied Materials & Interfaces
|August 21, 2020
PubMed
Summary
This summary is machine-generated.

Reduced graphene oxide (RGO) modified aluminum foil enhances lithium-ion battery performance by improving adhesion and corrosion resistance. This functional current collector enables stable, high-voltage operation for next-generation energy storage.

Keywords:
aluminum foil modificationanti-corrosionhigh-voltage cathodeinterfacial resistancereduced graphene oxide

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aluminum foil is a common cathode current collector in lithium-ion batteries (LIBs).
  • Limitations include poor adhesion, limited contact area, and corrosion at high voltages, hindering LIB performance.
  • Developing advanced current collectors is crucial for high-performance rechargeable energy storage systems.

Purpose of the Study:

  • To develop a functional current collector that enhances interfacial adhesion and inhibits corrosion in LIBs.
  • To improve the long-term stability and electrochemical performance of high-voltage LIBs.

Main Methods:

  • Electrospraying of reduced graphene oxide (RGO) onto aluminum (Al) foil to create RGO/Al functional current collectors.
  • Fabrication and electrochemical testing of LiNi0.5Mn1.5O4 (LNMO) based LIBs using RGO/Al and bare Al current collectors.
  • Evaluation of cycling stability, rate capability, and interfacial resistance.

Main Results:

  • The RGO/Al current collector demonstrated improved adhesion and corrosion resistance compared to bare Al foil.
  • LNMO-RGO/Al cells showed superior long-term cycling stability with 90% capacity retention after 840 cycles at 1 C.
  • Enhanced rate capability (101.8 mAh g-1 at 5 C) and reduced interfacial resistance were observed in LNMO-RGO/Al cells.

Conclusions:

  • RGO-modified aluminum foil serves as an effective functional current collector for high-voltage LIBs.
  • The improved interfacial properties contribute to enhanced electrochemical performance and long-term stability.
  • This advancement offers potential for developing next-generation 5 V LIBs.