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Related Concept Videos

Alkali Metals03:06

Alkali Metals

19.3K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
19.3K
Electrolysis03:00

Electrolysis

26.3K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

40.4K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
40.4K
MOS Capacitor01:25

MOS Capacitor

767
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
767
Batteries and Fuel Cells03:12

Batteries and Fuel Cells

27.3K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
27.3K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.4K
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. 
41.4K

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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A 3.2 V Binary Layered Oxide Cathode for Potassium-Ion Batteries.

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  • 1Faraday Materials Laboratory (FaMaL), Materials Research Centre, Indian Institute of Science, Bangalore, 560012, India.

Small (Weinheim an Der Bergstrasse, Germany)
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Summary

Researchers developed a new cobalt-free cathode for potassium-ion batteries (KIBs). This P3-type layered oxide demonstrates excellent performance and reversibility, paving the way for cost-effective energy storage solutions.

Keywords:
P3‐type layered oxidescathodesenergy storagepotassium‐ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Potassium-ion batteries (KIBs) offer a promising alternative to lithium-ion batteries due to potassium's abundance and cost-effectiveness.
  • Developing high-performance, economical cathodes is crucial for KIB commercialization.
  • Cobalt-free cathode materials are highly desirable for sustainable energy storage.

Purpose of the Study:

  • To synthesize and characterize a novel P3-type layered oxide, K0.5Ni1/3Mn2/3O2, as a potential cathode for KIBs.
  • To investigate the electrochemical performance and ion (de)insertion mechanisms of the synthesized material.
  • To explore the role of nickel (Ni) and manganese (Mn) in tuning the cathode's properties.

Main Methods:

  • Solid-state synthesis method for preparing the P3-type K0.5Ni1/3Mn2/3O2 cathode.
  • Electrochemical testing at ambient and elevated temperatures (40-50 °C).
  • First-principles calculations to understand the material's structure-property relationships.
  • Postmortem analysis and electrochemical titration to elucidate the ion insertion mechanism.

Main Results:

  • The P3-type K0.5Ni1/3Mn2/3O2 material functions as a 3.2 V cathode.
  • Highly reversible potassium-ion (de)insertion was observed at various temperatures.
  • First-principles calculations revealed a strong correlation between K-content and the in-plane Mn-Ni ordering.
  • A solid solution mechanism governs K+ (de)insertion, with Ni redox contributing at high voltage and Mn redox at low voltage.
  • Ni addition effectively enhanced the electrochemical performance.

Conclusions:

  • P3-type K0.5Ni1/3Mn2/3O2 is a promising low-cost, cobalt-free cathode material for KIBs.
  • The material exhibits excellent electrochemical performance and structural stability.
  • This research offers valuable insights for developing advanced KIB cathodes for stationary energy storage applications.