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Corrosion02:49

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The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Non-Corrosive Methide-Based Lithium Salt for Stabilizing Ni-Rich NMC Cathodes.

Juntian Fan1, Vaidyanathan M Sethuraman1, Albina Borisevich2

  • 1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|January 29, 2026
PubMed
Summary
This summary is machine-generated.

A new lithium salt, lithium bis(trifluoromethanesulfonyl)methide (LiCTf2), enhances stability for high-nickel cathodes in lithium-ion batteries. This non-corrosive salt improves cycling performance without additives.

Keywords:
NMC cathodesaluminum corrosionanion engineeringinterfacial stabilitymethide‐based lithium salts

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • High-nickel LiNixMnyCo1-x-yO2 (NMC) cathodes offer high energy density for next-generation lithium-ion batteries (LIBs).
  • Interfacial instability with conventional electrolytes, particularly lithium hexafluorophosphate (LiPF6) and lithium bis(trifluoromethanesulfonyl)imide (LiNTf2), limits NMC cathode performance and battery lifespan.
  • LiNTf2 causes aluminum current collector corrosion above 3.7 V, necessitating the development of non-corrosive electrolyte alternatives.

Purpose of the Study:

  • To introduce and evaluate a novel, non-corrosive methide-based lithium salt, lithium bis(trifluoromethanesulfonyl)methide (LiCTf2), for stabilizing NMC cathodes.
  • To investigate the mechanism by which LiCTf2 suppresses aluminum corrosion and enhances interfacial stability.
  • To demonstrate the improved electrochemical performance of NMC cathodes using LiCTf2-based electrolytes.

Main Methods:

  • Synthesis and characterization of the novel lithium bis(trifluoromethanesulfonyl)methide (LiCTf2) salt.
  • Electrochemical testing of LiNi0.5Mn0.3Co0.2O2 (NMC532) and LiNi0.8Mn0.1Co0.1O2 (NMC811) cathodes in electrolytes containing LiCTf2, LiNTf2, and LiPF6.
  • Electrochemical and microscopic characterization to analyze interfacial stability and corrosion mechanisms.

Main Results:

  • LiCTf2 effectively suppresses aluminum current collector corrosion by forming low-solubility Al3+ complexes, unlike LiNTf2.
  • The LiCTf2 anion enhances Li+ coordination, reinforcing solvation structures and promoting denser interphases.
  • NMC532 and NMC811 cathodes cycled in LiCTf2-based electrolytes exhibit significantly improved cycling stability compared to those using LiNTf2 or LiPF6, without needing film-forming additives.

Conclusions:

  • Lithium bis(trifluoromethanesulfonyl)methide (LiCTf2) is a promising non-corrosive lithium salt for advanced LIB electrolytes.
  • LiCTf2 offers intrinsic interfacial engineering capabilities, enhancing the electrochemical stability and cycling performance of high-nickel NMC cathodes.
  • This work provides a new avenue for electrolyte optimization, crucial for developing safer and more durable next-generation lithium-ion batteries.