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Related Concept Videos

Electrodeposition01:08

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Quantifying and Inhibiting Manganese Dissolution in Li-Rich Mn-Based Cathode Materials.

Ziyang Zhan1, Wenjie Peng1, Lin Yuan1

  • 1National Energy Metal Resources and New Materials Key Laboratory, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy, School of Metallurgy and Environment, Central South University, Changsha 410083, P. R. China.

ACS Nano
|November 12, 2025
PubMed
Summary

Manganese dissolution in lithium-rich manganese-based (LRMO) cathodes is complex across voltage ranges. Surface modification effectively suppresses this dissolution, enhancing battery stability and performance.

Keywords:
Jahn−Teller distortionatomic layer depositioncathode materialslithium-Ion batteriestransition metal dissolution

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Lithium-rich manganese-based (LRMO) materials are key for high-energy-density cathodes in electronics and electric vehicles.
  • Manganese (Mn) dissolution poses a significant challenge, causing structural instability and performance degradation in LRMO cathodes.

Purpose of the Study:

  • To elucidate the Mn dissolution mechanism in LRMO materials across various voltage ranges.
  • To validate the proposed mechanism and enhance LRMO cathode stability through surface modification.

Main Methods:

  • Electrochemical cycling and analysis of Mn dissolution.
  • Surface modification using Atomic Layer Deposition (ALD) to apply a LPO nanocoating.
  • Quantitative analysis of Mn dissolution levels and voltage retention.

Main Results:

  • Mn dissolution mechanisms vary significantly with voltage: Mn4+ reduction and disproportionation (2.5-3.5 V), lattice oxygen release (above 4.3 V), and Jahn-Teller effects/electrolyte reactions (3.5-4.3 V).
  • Contrary to expectations, substantial Mn dissolution occurs even in the moderate 3.5-4.3 V range.
  • ALD-based LPO nanocoating effectively suppressed electrode/electrolyte side reactions, reduced Mn dissolution, and improved voltage retention.

Conclusions:

  • Mn dissolution in LRMO cathodes is a complex, voltage-dependent phenomenon.
  • Electrolyte interactions play a critical role in Mn dissolution.
  • Surface engineering, specifically LPO nanocoating, is a viable strategy for stabilizing LRMO cathodes.