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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

241
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...
241

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Related Experiment Video

Updated: May 5, 2026

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Aqueous Sodium Humate Binder Enabling Ultra-Stable High-Voltage Cathodes via Protection from Interface to Bulk.

Jinwei Zhou1, Zhao-Kun Guan2, Ming Hao1

  • 1School of Metallurgy and Environment, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha, 410083, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|November 28, 2025
PubMed
Summary

Sodium humate (NaHA) acts as a novel binder for high-voltage lithium cobalt oxide (LCO) cathodes in lithium-ion batteries. This eco-friendly material enhances stability and performance, enabling sustainable battery design.

Keywords:
Lithium‐ion batteriesaqueous binderdopinghigh‐voltage cathodessurface coating

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Energy

Background:

  • High-voltage operation in lithium-ion batteries (LIBs) enhances energy density but faces challenges like interphase instability and structural degradation in cathodes.
  • Lithium cobalt oxide (LCO) cathodes offer high bulk energy density but are susceptible to degradation at elevated voltages.

Purpose of the Study:

  • To investigate sodium humate (NaHA) as a multifunctional binder for high-voltage LCO cathodes.
  • To improve the electrochemical performance and structural stability of LCO cathodes under high-voltage conditions.
  • To explore a sustainable and scalable binder-based strategy for advanced LIBs.

Main Methods:

  • Utilized sodium humate (NaHA), rich in -COOH and -OH functional groups, as a binder for LCO cathodes.
  • Investigated NaHA's ability to form hydrogen bonds for uniform coating and create a protective interphase.
  • Analyzed NaHA's role in facilitating in situ trace sodium doping into the LCO lattice.

Main Results:

  • NaHA binder demonstrated robust hydrogen bonding and promoted a protective interphase layer.
  • In situ Na doping via NaHA enhanced the bulk structural stability of LCO.
  • LCO cathodes with NaHA binder retained 95.1% capacity after 1700 cycles at 4.45V and 87.1% after 1000 cycles at 4.5V.
  • The water solubility of NaHA facilitated electrode disassembly and recyclability.

Conclusions:

  • NaHA serves as an effective multifunctional binder for high-voltage LCO cathodes, enhancing both surface and bulk stability.
  • The binder-directed strategy offers a scalable, eco-friendly, and efficient route to stabilize high-voltage LCO cathodes.
  • This approach supports the development of high-specific-energy LIBs with improved cycle life and sustainability.