catinbarn

Electrochemical Impedance Spectroscopy For Batteries

The impedance of the pouch-type full cell can be measured by electrochemical impedance spectroscopy, e.g. using an AutoLab modular potentiostat/galvanostat (Metrohm AG) over a 1 MHz to 0.01 Hz frequency range with an amplitude of 10 mV.

Li-Air Battery

A basic Li-O2 battery consists of a metal lithium anode, a separator, an electrolyte, and a cathode.

Li-S Battery

A Li-S cell works based on the following conversion reaction: 2Li + S ↔ Li2S

Roses

Dog Friendly Parks

Dog friendly parks:

Si-Anode Lithium Ion Battery (LIB)

Si-aonde Lithium ion battery

Web-tension isolation by pull rolls

Proper web handling is to provide good web-tension isolation between the unwind, process and the winding tension. Pull rolls are critical components in web handling system

Tension control

For professional coater, the tension is isolated into 3 zones: unwinding zone, internal zone, rewinding zone. Tension=torque/roll radius. During coating, the diameters of unwinder and rewinder are constantly change; therefore, to keep tension constant, torque should change according to roll diameter change.

Web spreading

Web spreading is a critical technology to remove wrinkles in web handling. There are three techniques to achieve the purpose:

Plasma Basics

What is plasma?

An ionized gas consisting of ions (mainly positive ions) and free electrons in proportions
Electrons are moving much faster than ions, due to mass difference
Quasi-zero overall electric charges
The 4^th state of matter
Important parameters about plasma: plasma density, plasma potential, ion energy