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Non-aqueous Electrode Processing and Construction of Lithium-ion Coin Cells
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Constructing a Micrometer-Sized Structure through an Initial Electrochemical Process for Ultrahigh-Performance Li+

Shu-Ang He1, Qian Liu2, Wei Luo1

  • 1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China.

ACS Applied Materials & Interfaces
|July 26, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel S-doped niobium pentoxide on S-doped graphene composite for high-rate lithium-ion batteries (LIBs). This material demonstrates enhanced conductivity and stability, leading to superior fast-charging performance and long cycle life.

Keywords:
Nb2O5-based electrodeengineered architecturein situ electrochemical transformationlithium-ion-battery anodemicrometer-sized structure

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Orthorhombic niobium pentoxide (T-Nb2O5) shows potential for high-rate lithium-ion batteries (LIBs).
  • Limited electric conductivity and unclear electrochemical mechanisms impede T-Nb2O5 applications.
  • Development of advanced anode materials is crucial for next-generation LIBs.

Purpose of the Study:

  • To develop a novel S-doped Nb2O5/S-doped graphene (S-Nb2O5/SG) composite for high-rate LIBs.
  • To investigate the "in situ electrochemically induced aggregation" mechanism.
  • To enhance the electrochemical performance of niobium pentoxide-based anodes.

Main Methods:

  • Synthesis of S-Nb2O5/SG composite via a novel method.
  • Utilizing "in situ electrochemically induced aggregation" to form micrometer-sized layers.
  • Employing in situ/ex situ characterizations and theoretical calculations.

Main Results:

  • The S-Nb2O5/SG composite exhibits a micrometer-sized layer structure after the first cycle.
  • Enhanced reaction degree, structural stability, and electrochemical kinetics were observed.
  • Achieved a high capacity of ~598 mAh g-1 at 0.1 A g-1 and retained ~313 mAh g-1 at 5 A g-1 after 1000 cycles.

Conclusions:

  • The "in situ electrochemically induced aggregation" strategy effectively improves Nb2O5 anode performance.
  • The S-Nb2O5/SG composite demonstrates excellent fast-charging capability and long-term cycling stability.
  • This work provides a new pathway for designing high-performance LIB anode materials.