Engineering
Following months of promising test results, battery researchers at the Department of Energy's Oak Ridge National Laboratory are recommending that the solid-state battery industry focus on a technique known as isostatic pressing ...
Mar 23, 2023
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36
Energy & Green Tech
A new process for restoring spent cathodes to mint condition could make it more economical to recycle lithium-ion batteries. The process, developed by nanoengineers at the University of California San Diego, is more environmentally ...
Nov 12, 2020
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77
Energy & Green Tech
(TechXplore)—In a review article in Nature Energy, Yongming Sun, Nian Liu, and Yi Cui from Stanford University survey how nanomaterials have advanced the field of lithium rechargeable batteries and what obstacles still ...
Energy & Green Tech
New research led by WMG, at the University of Warwick has found an effective approach to replacing graphite in the anodes of lithium-ion batteries using silicon, by reinforcing the anode's structure with graphene girders. ...
Jan 23, 2018
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465
Engineering
3-D printing has become an increasingly important production method. Researchers at ETH have now developed a new 3-D printing technique by which micrometre-sized objects made of several metals can be produced with high spatial ...
Apr 30, 2019
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253
Energy & Green Tech
Lithium-ion batteries have made possible the lightweight electronic devices whose portability we now take for granted, as well as the rapid expansion of electric vehicle production. But researchers around the world are continuing ...
Mar 25, 2021
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102
Engineering
Researchers have found that the irregular movement of lithium ions in next-generation battery materials could be reducing their capacity and hindering their performance.
Oct 14, 2022
1
27
Energy & Green Tech
An international research team featuring two Skoltech scientists has experimentally demonstrated that a long-standing explanation for low energy efficiency in lithium-ion batteries does not hold. The researchers explained ...
Sep 21, 2021
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109
Energy & Green Tech
Lithium ion batteries are a bit famous for their poor cold-weather performance, and that has consequences for some of their most important applications—everything from starting an electric car in a Wisconsin winter to flying ...
Aug 26, 2021
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372
Energy & Green Tech
Researchers have developed a new technique to solve the problem of how to increase the capacity of sodium-ion batteries.
Jun 19, 2024
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23
An ion is an atom or molecule where the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge.
Since protons are positively charged and electrons are negatively charged, if there are more electrons than protons, the atom or molecule will be negatively charged. This is called an anion (pronounced /ˈænaɪən/; an-eye-on), from the Greek ἀνά (ana), meaning 'up'.
Conversely, if there are more protons than electrons, the atom or molecule will be positively charged. This is called a cation (pronounced /ˈkætaɪən/; cat-eye-on), from the Greek κατά (kata), meaning 'down'.
An ion consisting of a single atom is called a monatomic ion. If it consists of two or more atoms, it is called a polyatomic ion. Polyatomic ions containing oxygen, such as carbonate and sulfate, are called oxyanions.
When writing the chemical formula for an ion, its charge is written as a superscript '+' or '−' following a number indicating the difference between the number of protons and the number of electrons. The number is omitted if it is equal to 1. For example, the sodium cation is written as Na+, the '+' indicating that it has one less electron than it has protons. The sulfate anion is written as SO42−, the '2−' indicating that it has two more electrons than it has protons.
If an ion contains unpaired electrons, it is called a radical ion. Just like neutral radicals, radical ions are very reactive.
This text uses material from Wikipedia, licensed under CC BY-SA
