Energy & Green Tech
The thin-film lithium-ion batteries used in microdevices such as portable and medical electronics may supply a good amount of power relative to their mass, but do not provide enough power for many devices due to their limited ...
Apr 6, 2021
0
92
Energy & Green Tech
A team of researchers affiliated with several institutions in China has found a way to make batteries using zinc instead of lithium ions but without the issues traditionally associated with zinc. In their paper published ...
Energy & Green Tech
Researchers from the University of Surrey and the University of Bristol are working on innovative devices to tame and store carbon-free renewable energy from unpredictable sources such as wind and solar.
Nov 5, 2021
0
251
Energy & Green Tech
A research group led by Professor Minoru Osada at the Institute for Materials and Systems for Sustainability (IMaSS), Nagoya University in Japan, in collaboration with NIMS, has developed a nanosheet device with the highest ...
Jul 4, 2023
0
103
Energy & Green Tech
Lithium-ion batteries, widely used in devices ranging from electric cars to iPhones, are composed of a cathode made from a positively charged lithium compound and an anode composed of negatively charged carbon. Ideally, anodes ...
Dec 20, 2016
0
423
Energy & Green Tech
A collaborative research team led by Dr. Minah Lee of the Energy Storage Research Center, Professor Dong-Hwa Seo of KAIST, and Drs. Yong-Jin Kim and Jayeon Baek of the Korea Institute of Industrial Technology (KITECH) has ...
Aug 1, 2023
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84
Engineering
A new battery design could help ease integration of renewable energy into the nation's electrical grid at lower cost, using Earth-abundant metals, according to a study just published in Energy Storage Materials. A research ...
Feb 7, 2023
0
22
Energy & Green Tech
The University of Western Australia's Renewable Energy Vehicle Project (REV) has teamed up with technology partner Electro.Aero, a Perth-based start-up company, and funding sponsor Galaxy Resources, an ASX-listed lithium ...
Aug 2, 2019
0
13
Energy & Green Tech
Current society is transitioning en masse from fossil fuels to renewable resources and electric batteries. Despite the urgency to switch to greener methods, core challenges related to efficiency and sustainability pose a ...
Mar 3, 2023
0
37
Energy & Green Tech
Researchers have developed a new way to improve lithium ion battery efficiency. Through the growth of a cubic crystal layer, the scientists have created a thin, dense connecting layer between the electrodes of the battery. ...
Feb 26, 2018
1
259
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
