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Related Concept Videos

Thermal expansion and Thermal stress: Problem Solving01:27

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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In normal-weight aggregate concrete, the hardened cement paste is the primary contributor to creep, whereas the aggregates, being stiffer than the cement paste, are more resilient to stress-induced deformation. The stiffness of the aggregates is defined by their modulus of elasticity, and the more voluminous they are in the concrete, the less it will creep.
Further, the water/cement ratio is critical, as a lower ratio increases concrete strength, thus reducing creep. The strength of the...
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Effects of Creep01:25

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Creep in concrete, the gradual deformation under prolonged stress, significantly impacts the integrity of structures. For reinforced concrete beams, it can be a vital design consideration, as it increases deflection, sometimes necessitating additional design measures. In columns, especially slender ones under eccentric loads, creep can cause buckling, compromising their stability. However, creep can be beneficial in indeterminate structures by mitigating stresses that arise from shrinkage,...
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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Le Chatelier's Principle: Changing Temperature02:19

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Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in the value of the equilibrium constant, K. When an equilibrium shifts in response to a temperature change, however, it is re-established with a different relative composition that exhibits a different value for the equilibrium constant.
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For gas-phase equilibria, changes in the concentrations of reactants and products can occur with altered volume and pressure. The partial pressure, P, of an ideal gas is proportional to its molar concentration, M.
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Void Evolution at the Li/LLZO Interface: Stack Pressure and Operating Temperature-Driven Creep Effect.

Ke Li1, Jundi Huang1, Xinyi Qu1

  • 1School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan, Hubei 430074, China.

ACS Applied Materials & Interfaces
|January 6, 2025
PubMed
Summary
This summary is machine-generated.

Stack pressure and temperature enhance solid-state battery stability by promoting lithium metal creep, which heals interface voids. This research provides a model to optimize conditions for void healing and improved battery performance.

Keywords:
CreepLithium−metal anodeOperating temperatureSolid-state electrolyteStack pressureVoid evolution

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-state Batteries

Background:

  • All-solid-state lithium metal batteries offer high energy density and safety but suffer from interface voids during cycling.
  • Void formation at the lithium metal anode/solid-state electrolyte interface degrades contact and cycle stability.
  • Understanding the role of stack pressure and temperature on void evolution via creep is crucial for interface stability.

Purpose of the Study:

  • To develop a model for void evolution at the lithium metal anode/solid-state electrolyte interface.
  • To investigate the influence of stack pressure and operating temperature on void healing through creep deformation.
  • To establish a theoretical basis for optimizing pressure and temperature to ensure interface stability.

Main Methods:

  • Developed a coupled electrochemical-diffusion-mechanical (creep)-phase field for void evolution (EDMP-VE) model.
  • Modeled lithium stripping/deposition, diffusion, creep, lattice distortion, and vacancy dynamics.
  • Utilized normalized geometric parameters and stress/strain evolution to characterize void dynamics.

Main Results:

  • The EDMP-VE model accurately captures void evolution during lithium stripping and plating cycles.
  • High stack pressure and operating temperature promote lithium metal creep, suppressing void expansion and accelerating void filling.
  • A phase diagram identified optimal pressure-temperature windows for void healing and interface stability.

Conclusions:

  • Stack pressure and operating temperature-driven creep significantly impact void evolution and interface integrity in solid-state batteries.
  • Optimizing these parameters can lead to void annihilation and improved interfacial contact.
  • This study provides a theoretical framework and practical guidance for enhancing solid-state battery cycle life.