Energy & Green Tech

3-D batteries pack power into tiny footprints

Batteries might seem like they come in every shape and size that you can imagine. But as electronic devices become tinier and skinnier without reducing their power and energy demands, they challenge engineers to design batteries ...

Energy & Green Tech

Temperature heals lithium dendrites

Rechargeable lithium-ion, the dominant battery technology for portable electronics, is increasingly becoming the battery of choice for electric-vehicle and electric-grid energy-storage applications.

Energy & Green Tech

New design produces true lithium-air battery

Researchers at the University of Illinois at Chicago and at Argonne National Laboratory have designed a new lithium-air battery that works in a natural-air environment and still functioned after a record-breaking 750 charge/discharge ...

Energy & Green Tech

Engineers develop new material for better lithium-ion batteries

The batteries we use every day may soon become cheaper, smaller and lighter. Researchers in the Cockrell School of Engineering at The University of Texas at Austin have discovered a family of anode materials that can double ...

Energy & Green Tech

Making batteries from waste glass bottles

Researchers at the University of California, Riverside's Bourns College of Engineering have used waste glass bottles and a low-cost chemical process to create nanosilicon anodes for high-performance lithium-ion batteries. ...

Energy & Green Tech

Safer batteries made with wood

Inspired by the structure of wood, engineers at the University of Maryland have used modified wood as a unique architecture for the negative electrode of a lithium (Li) metal battery, seeking to prevent some of the key factors ...

Energy & Green Tech

Next generation anode to improve lithium-ion batteries

Researchers at the University of California, Riverside have created a new silicon-tin nanocomposite anode that could lead to lithium-ion batteries that can be charged and discharged more times before they reach the end of ...

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Anode

An anode is an electrode through which electric current flows into a polarized electrical device. Mnemonic: ACID (Anode Current Into Device). Electrons flow in the opposite direction to the electric current (flow of hypothetical positive charge)

A widespread misconception[citation needed] is that anode polarity is always positive. This is often incorrectly inferred from the correct fact that in all electrochemical devices negatively charged anions move towards the anode (hence their name) and/or positively charged cations move away from it. In fact anode polarity depends on the device type, and sometimes even in which mode it operates, as per the above electric current direction-based universal definition. Consequently, as can be seen from the following examples, in a device which consumes power the anode is positive, and in a device which provides power the anode is negative:

An electrode through which current flows the other way (out of the device) is termed a cathode.

This text uses material from Wikipedia, licensed under CC BY-SA