Transcript Rechargeable Batteries (Michel Zarate)

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A battery is an electric
storage device, which can
come in a variety of shape,
size, voltage and capacity,
and translate chemical
energy into electricity and is
an efficient way to make
electricity portable.
When two materials (often
dissimilar metals) are
immersed in a solution
(electrolyte) they conduct
electricity, between the
"plates" causing an electrical
potential. Examples are: lead
acid, nickel cadmium, lithium,
silver alkaline, etc.
Lithium Battery is "general name"
that battery uses lithium metal or
lithium aluminum alloy etc in its
negative electrode (Anode). lithium
battery have high energy density,
high voltage and other benefits
A rechargeable battery use solid
polymer as electrolyte. Most
Lithium polymer batteries require
heat to promote conductivity. the
Lithium ions inside the battery
transfer between the positive
electrode and the negative
electrode during charge or
discharge, namely Rocking Chair
Batteries (RCB).
LI-ION: HOW CELLS ARE DAMAGED
The biggest problem with the Li-Ion battery is the ease with which it can be damaged
during use:
The Li-Ion battery carries a very large amount of energy in a small package. Combined
with the fact that the internal resistance is fairly high, you have the potential for a very
dangerous product: If the cell is accidentally shorted, it could get hot enough to burn a
user (and possibly explode).
The Li-Ion cell should never be
allowed to drop below about 2.4V,
or an internal chemical reaction will
occur where one of the battery
electrodes can oxidize (corrode)
through a process
which can not be reversed by
recharging. A similar process will
occur if an Li-Ion cell is charged to
too high of a voltage. If current is
continually forced into a fully
charged cell, internal corrosion can
take place which will
reduce cell capacity
REFERENCES
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Ormond, Tom. Rechargeable Batteries. EDN Magazine, Dec. 8, 1988.
2. Harrison, Michael. Rechargeable Batteries Are Included. Powertechnics Magazine, May 1988.
3. Baay, David. Nickel-Cadmium Batteries. Electronic Products, December 1988.
4. Costello, John. Choosing the Right Battery to Power the Portable Product. Electronic Products,
December 1992.
5. Small, Charles. Nickel-Hydride Cells Avert Environmental Headaches. EDN Magazine, December
1992.
6. Panasonic Corp. Nickel Cadmium Batteries Technical Handbook.
7. Sanyo Corp. Rechargeable Nickel Cadmium Batteries, Engineering Databook.
8. Matusita Battery Industrial Co.,Ltd. Development of Lithium Ion Rechargeable Battery .
9. Sanyo Energy (USA) Corp., Sanyo: Lithium Ion Battery.
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