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Related Concept Videos

Properties of Transition Metals02:58

Properties of Transition Metals

29.6K
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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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 Solids02:37

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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Gravimetry: Inorganic And Organic Precipitating Agents00:49

Gravimetry: Inorganic And Organic Precipitating Agents

6.7K
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
6.7K
Alkali Metals03:06

Alkali Metals

24.2K
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
24.2K
Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Inorganic Gel-Derived Metallic Frameworks Enabling High-Performance Silicon Anodes.

Anping Zhang1, Zhiwei Fang2, Yawen Tang1

  • 1Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science , Nanjing Normal University , Nanjing 210023 , China.

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Researchers developed a 3D metallic framework using tin-nickel alloy to improve silicon anodes in lithium-ion batteries. This structure enhances silicon

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Metallic matrix materials are promising for next-generation battery electrodes like silicon.
  • Current metallic species often form isolated particles, limiting silicon's volume expansion buffering and charge transport.

Purpose of the Study:

  • To synthesize 3D metallic frameworks from inorganic gel precursors.
  • To create buffering/conducting matrices for enhanced lithium storage in silicon anodes.

Main Methods:

  • Synthesized 3D metallic frameworks from inorganic gel precursors.
  • Immobilized commercial silicon (Si) particles within a tin-nickel (Sn-Ni) alloy framework via gel-reduction.
  • Investigated the performance of the Si@Sn-Ni all-metallic framework in lithium-ion batteries.

Main Results:

  • The Si@Sn-Ni all-metallic framework exhibited high structural integrity and a 3D Li+/e- mixed conduction pathway.
  • Demonstrated synergistic effects between silicon and Sn-Ni alloy, improving interfacial bonding and reaction dynamics.
  • Achieved long-term cycle life (1205 mA h g-1 after 100 cycles at 0.5 A g-1) and superior rate capability (653 mA h g-1 at 10 A g-1).

Conclusions:

  • The developed 3D metallic framework effectively buffers silicon volume changes and facilitates charge transport.
  • The Si@Sn-Ni all-metallic framework shows significant potential for high-performance lithium-ion battery anodes.