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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Microbe-Assisted Nanocomposite Anodes for Aqueous Li-Ion Batteries.

Pei-En Weng1, Alexander Gooyandeh1, Muhammad Tariq1

  • 1Chemical and Materials Engineering Department, Charles W. Davidson College of Engineering, San José State University, One Washington Square, San José, California 95192-0080, United States.

ACS Applied Materials & Interfaces
|August 13, 2021
PubMed
Summary

Researchers developed microbe-derived carbon interlayers for safer lithium-ion batteries (LIBs) using water-in-salt (WIS) electrolytes. This innovation enhances anode performance and stability, addressing safety concerns associated with traditional LIBs.

Keywords:
aqueous batterybiomaterialslithium-ion batteriesmicrobial compositeswater-in-salt electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Biomaterials Engineering

Background:

  • Lithium-ion batteries (LIBs) face safety challenges due to flammable organic electrolytes.
  • Water-in-salt (WIS) electrolytes offer a safer alternative but are limited by a high cathodic limit, restricting low-potential anode use.
  • Developing effective interlayers is crucial for advancing WIS electrolyte technology.

Purpose of the Study:

  • To synthesize biodirected carbonaceous interlayers for anodes in WIS electrolytes.
  • To investigate the impact of microbe-derived carbon on anode conductivity and WIS electrolyte stability.
  • To optimize microbe size and aspect ratio for enhanced battery performance.

Main Methods:

  • Biodirected synthesis of carbonaceous layers using high-aspect ratio microbes on TiO2 nanoparticles.
  • Utilizing microbes of varying aspect ratios to study network formation and battery performance.
  • Performing density functional theory (DFT) calculations to elucidate the mechanism of performance improvement.
  • Analyzing the effect of storage time on microbe size.

Main Results:

  • Microbe-derived carbon interlayers (m-TiO2) significantly enhanced anode performance in WIS electrolytes.
  • m-TiO2 anodes showed a 49% higher capacity at the 40th cycle compared to uncoated TiO2.
  • The developed interlayers improved cycle life while using less carbon precursor than conventional methods.
  • DFT calculations indicated that pyridinic nitrogen in microbe-derived carbon slows water diffusion.

Conclusions:

  • Biodirected synthesis of carbonaceous interlayers using microbes is a viable strategy for safer and more efficient WIS electrolytes.
  • Optimized microbe size and composition are key for maximizing battery performance.
  • This approach offers a novel pathway for fabricating advanced energy storage materials from biomaterials.