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Design Consideration01:22

Design Consideration

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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
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Design Example: Sustainability in Concrete Building01:26

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Design Example: Application of Archimedes' Principle01:11

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Surface Reconstruction as a Design Principle for Ni-rich Cathodes.

Sumaiyatul Ahsan1, Abiram Krishnan1, Mengkun Tian2

  • 1School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332 USA.

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|January 14, 2026
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Summary

Researchers transformed a battery degradation mechanism into a stabilization strategy. By creating a NiO surface layer on nickel-rich cathodes (NMC811), they enhanced battery performance and durability.

Keywords:
Ni‐rich cathodesX‐ray diffractiondensity functional theoryelectrochemistrysurface reconstruction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Surface reconstruction in nickel-rich cathodes is typically a degradation pathway.
  • Formation of inert phases like NiO is often associated with battery failure.

Purpose of the Study:

  • To leverage the surface NiO phase as a stabilizing element in nickel-rich cathodes.
  • To develop a materials-intrinsic and scalable method for enhancing battery durability.

Main Methods:

  • Density functional theory (DFT) calculations to predict NiO stability.
  • Variable temperature X-ray diffraction (VTXRD) to control surface phase transformation.
  • X-ray photoelectron spectroscopy (XPS) and scanning transmission electron microscopy (STEM) for structural analysis.
  • Electrochemical techniques (cycling, CV, EIS) to evaluate performance.

Main Results:

  • A core-shell structure with a protective NiO surface layer was successfully created on NMC811.
  • Modified cathodes exhibited improved capacity, enhanced Li+ diffusivity, and reduced resistance.
  • Bulk oxidation state remained unchanged, and structural heterogeneity was reduced.

Conclusions:

  • Surface NiO can be controllably engineered as a beneficial component, not a defect.
  • This approach offers a scalable route to improve the cycle life of high-nickel battery cathodes.
  • Reframing surface reconstruction as a design principle enhances battery longevity.