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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...
Electrochemical Systems01:24

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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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Related Experiment Video

Updated: May 19, 2026

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
08:06

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Published on: February 23, 2017

Hybrid Conductive Network Enabling Synergistic Polarization Mitigation and Cathode Electrolyte Interphase (CEI)

Xiangyang Lian1,2, Runze Yu1,2, Fanjun Liu1,2

  • 1School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, China.

Small (Weinheim an Der Bergstrasse, Germany)
|May 17, 2026
PubMed
Summary
This summary is machine-generated.

Engineered conductive networks using graphene and Ketjen Black stabilize Li-rich disordered rock salt cathodes. This strategy enhances electrochemical performance and cycle life for high-energy-density batteries.

Keywords:
anchoring effectcathode electrolyte interphase (CEI)disordered rocksalt cathode (DRX)hybrid conductive network

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Li-rich cation-disordered rocksalt (DRX) oxides offer high energy density for cathodes.
  • Practical use is limited by polarization and interfacial instability at high voltages, causing capacity fade.

Purpose of the Study:

  • To develop an electrode-level optimization strategy for stabilizing Li-rich DRX cathodes.
  • To improve high-voltage performance and cycle life through conductive-network engineering.

Main Methods:

  • Constructed a hybrid conductive network (K1G3) by integrating graphene (Gr) and Ketjen Black (KB).
  • Investigated the effects of the conductive network on electronic pathways, charge accumulation, and interfacial stability.
  • Analyzed the coordination between Gr and transition metal ions, and the formation of the cathode electrolyte interphase (CEI).

Main Results:

  • The K1G3 network provided continuous electronic pathways and reduced interfacial charge accumulation, mitigating polarization and side reactions.
  • Strong Gr-TM ion coordination suppressed TM dissolution and promoted a uniform, LiF-rich CEI.
  • Optimized Mn-based DRX cathode achieved 154 mAh g⁻¹ at 1000 mA g⁻¹ and retained 84.0% capacity after 100 cycles at 50 mA g⁻¹, outperforming Super C65 electrodes.
  • Performance benefits were confirmed in pouch cells.

Conclusions:

  • Conductive-network engineering is an effective strategy for stabilizing Li-rich DRX cathodes.
  • The hybrid K1G3 network significantly enhances rate capability, cycle stability, and overall performance for high-energy-density battery applications.