Energy & Green Tech

How sodium-ion batteries could make electric cars cheaper

Cars that burn petrol and diesel must be replaced with renewable alternatives if the climate crisis is to be overcome. Electric vehicles (EVs) are widely viewed as the best option available.

Energy & Green Tech

Cathode oxidation research overturns current thinking on batteries

Scientists have made a significant breakthrough in understanding and overcoming the challenges associated with Ni-rich cathode materials used in lithium-ion batteries. Researchers from the Universities of Birmingham, Cambridge, ...

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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