Energy & Green Tech
Lithium-ion (Li-ion) batteries, rechargeable batteries that can store energy via the reversible reduction of lithium ions, are among the most widespread battery technologies, due to their remarkable performance and extended ...
Engineering
Engineering researchers have created new high-power electronic devices that are more energy efficient than previous technologies. The devices are made possible by a unique technique for "doping" gallium nitride (GaN) in a ...
Sep 6, 2022
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232
Energy & Green Tech
To sustain human civilization in the future, clean energy sources must be harnessed to replace the fossil fuels that are now polluting our atmosphere. Solar and wind energy can supply all the necessary energy. However, storage ...
Jul 23, 2018
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648
Energy & Green Tech
Lithium-ion batteries are recognized for their high energy density in everything from mobile phones to laptop computers and electric vehicles, but as the need for grid-scale energy storage and other applications becomes more ...
Jul 17, 2020
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69
Energy & Green Tech
A team in Cornell Engineering has created a new lithium battery that can charge in under five minutes—faster than any such battery on the market—while maintaining stable performance over extended cycles of charging and ...
Jan 22, 2024
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70
Energy & Green Tech
Lithium-ion batteries (LIBs), rechargeable batteries that store energy via the reversible reduction of lithium ions, are used to power countless devices and technologies, ranging from laptops and smartphones to electric cars. ...
Energy & Green Tech
As mobile phone users, all we want is enough battery life to last the day. Frustratingly, the older the device, the less power it seems to have.
Jul 31, 2017
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25
Energy & Green Tech
Three decades of advances took lithium-ion batteries from powering handheld Sony camcorders to propelling Tesla's popular electric vehicles. The rapid rise is facing a major test in the COVID-19 pandemic.
Jun 18, 2020
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5
Energy & Green Tech
One of the aspects of lithium-ion batteries least understood by scientists has now been elucidated by a new research approach, opening the door to major improvements in battery performance, according to a new study by Berkeley ...
Jan 15, 2021
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102
Energy & Green Tech
Our electronic world is full of batteries, and WA's renewable future may rely on them too.
Oct 16, 2023
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22
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
