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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

249
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...
249

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Gradient Structure Design of a Floatable Host for Preferential Lithium Deposition.

Qiuchan Cai1,2, Xianying Qin1,3, Kui Lin1,2

  • 1Shenzhen Key Laboratory on Power Battery Safety Research and Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Shenzhen, 518055, People's Republic of China.

Nano Letters
|December 1, 2021
PubMed
Summary
This summary is machine-generated.

A novel sandwichlike host electrode with gradient properties promotes uniform lithium deposition, suppressing dendrite growth. This enables stable cycling and high Coulombic efficiency for advanced lithium batteries.

Keywords:
artificial solid−electrolyte interphasedendrite-freegradient hostlithiophilicitylithium anode

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium metal batteries (LMBs) face challenges with lithium dendrite growth and uneven plating.
  • Developing stable solid-electrolyte interphases (SEIs) is crucial for LMB safety and longevity.
  • Uniform lithium deposition is key to improving battery performance and cycle life.

Purpose of the Study:

  • To design and fabricate a novel sandwichlike host electrode with gradient lithiophilicity and conductivity.
  • To investigate the electrode's ability to promote uniform lithium deposition and suppress dendrite formation.
  • To evaluate the electrochemical performance of the designed electrodes in lithium metal batteries.

Main Methods:

  • Fabrication of a reduced graphene oxide (rGO)/SiO2/rGO intercalated structure using electrospraying.
  • Coating an additional PVDF-HFP layer to create a gradient host electrode.
  • Electrochemical testing including cycling performance, capacity, and Coulombic efficiency measurements.

Main Results:

  • The gradient host electrode facilitated preferential, ordered, and uniform lithium deposition.
  • The rGO/PVDF-HFP layer effectively suppressed lithium dendrite growth and isolated lithium formation.
  • Stable cycling was achieved with a high capacity of 5 mAh cm⁻² and average Coulombic efficiency of 99.14%.

Conclusions:

  • The developed sandwichlike host electrode offers expandable accommodation and gradient characteristics.
  • The electrode design successfully mitigates key challenges in lithium metal battery operation.
  • Full cells demonstrated excellent performance with high Coulombic efficiency and capacity retention, even under lean electrolyte conditions.