Automotive

Volkswagen and Mercedes sign EV battery accords with Canada

Canada announced Tuesday tentative deals with Volkswagen and Mercedes-Benz that would see the two European automakers tap into burgeoning North American supply chains as they seek to challenge Tesla in the electric vehicle ...

Energy & Green Tech

New membrane improves reversibility of zinc-air batteries

The long-standing challenges to the practical implementation of rechargeable zinc-air batteries (ZABs) are the electrochemical irreversibility of the Zn anode and degradation of the air cathodes in alkaline electrolyte, which ...

Electronics & Semiconductors

Sulfonamides make robust cathode material for proton batteries

Proton batteries are an innovative and environmentally friendly type of battery in which charge is carried by protons, which are positively charged hydrogen ions. A team of researchers has now developed organic sulfonamides ...

Energy & Green Tech

Pivotal battery discovery could impact transportation and the grid

Battery-powered vehicles have made a significant dent in the transportation market. But that market still needs lower cost batteries that can power vehicles for greater ranges. Also desirable are low-cost batteries able to ...

Energy & Green Tech

Startup aims to fast-track lithium battery recycling

Billions of dead lithium-ion batteries, including many from electric vehicles, are accumulating because there is no cost-effective process to revive them. Now, Princeton researchers have developed an inexpensive, sustainable ...

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Cathode

A cathode is an electrode through which electric current flows out of a polarized electrical device. Mnemonic: CCD (Cathode Current Departs).

Cathode polarity is not always negative. Although positively charged cations always move towards the cathode (hence their name) and/or negatively charged anions move away from it, cathode polarity depends on the device type, and can even vary according to the operating mode. In a device which consumes power, the cathode is negative, and in a device which provides power, the cathode is positive:

An electrode through which current flows the other way (into the device) is termed an anode.

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