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Related Concept Videos

Weak Acid Solutions04:02

Weak Acid Solutions

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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Constructing compatible interface between Li7La3Zr2O12 solid electrolyte and LiCoO2 cathode for stable cycling

Yuwan Dong1, Panzhe Su1, Guanjie He2

  • 1International Joint Research Laboratory of New Energy Materials and Devices of Henan Province, School of Physics & Electronics, Henan University, Kaifeng 475004, P. R. China. ybai@henu.edu.cn zhao@henu.edu.cn.

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Surface modification of lithium cobalt oxide (LCO) with lithium lanthanum zirconium oxide (LLZO) enhances lithium-ion battery stability. This strategy improves cycling performance at high voltages, crucial for advanced energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Lithium cobalt oxide (LCO) is a key cathode material for lithium-ion batteries (LIBs) due to its high capacity.
  • Structural and interfacial instabilities limit LCO performance at high cut-off voltages.
  • Electrode-electrolyte compatibility is critical for all-solid-state batteries.

Purpose of the Study:

  • To create a stable interface between LCO and LLZO for improved LIB performance.
  • To enhance the cycling stability of LCO cathodes at high operating voltages.
  • To investigate the mechanisms behind interface stabilization.

Main Methods:

  • Facile surface modification of LCO with Li7La3Zr2O12 (LLZO).
  • Electrochemical cycling of modified LCO cathodes at a high cut-off voltage (4.5 V).
  • Material characterization to analyze interfacial changes and degradation mechanisms.

Main Results:

  • The LCO@1.0 LLZO composite showed 76.8% capacity retention after 1000 cycles at 3.0-4.5 V.
  • LLZO modification effectively suppressed side reactions and mitigated bulk structure degradation.
  • A gradient migration of La and Zr ions formed a protective Li-Co-La-Zr-O solid solution layer.

Conclusions:

  • Surface modification with LLZO provides a robust interface for LCO cathodes.
  • This approach enhances electrochemical stability and extends the operational voltage range of LCO.
  • The findings offer a strategy for developing high-performance LIBs and all-solid-state batteries.