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Related Concept Videos

Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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
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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
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Hollow-Structured Li Hosts Featuring Lithiophilic Metal/Metal Compound Sites for Li-Metal Anodes.

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Hollow nanostructures with metals or metal compounds improve lithium metal anode stability in high-energy lithium metal batteries. This review explores their application, characterization, and future prospects for advanced battery development.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Lithium-metal anodes (LMAs) offer high energy density for lithium-metal batteries (LMBs) but suffer from instability.
  • The host-less nature of lithium metal leads to dendrite formation and poor cycling stability.
  • Uniform lithium deposition is crucial for stable LMB performance.

Purpose of the Study:

  • To review the application of hollow lithium hosts containing metals or metal compounds for LMAs.
  • To investigate lithium deposition behavior in these hollow hosts using various characterization techniques.
  • To elucidate the mechanisms by which metals/metal compounds regulate lithium deposition.

Main Methods:

  • In situ and ex situ characterization techniques to study lithium deposition.
  • Analysis of structural and electrochemical properties of hollow Li hosts.
  • Review of existing literature on metal/metal compound-integrated hollow structures.

Main Results:

  • Metals and metal compounds enhance lithiophilicity, promoting uniform lithium deposition.
  • Hollow-structured nanomaterials serve as effective hosts for lithium metal.
  • Specific examples of hollow Li hosts with metal/metal compound sites are discussed.

Conclusions:

  • Hollow Li hosts incorporating metals or metal compounds show significant promise for stabilizing LMAs.
  • Understanding lithium deposition mechanisms in these hosts is key to further advancements.
  • Further research into advanced hollow host designs is expected to improve LMB performance.