The Li-polymer differentiates itself from other battery systems in the type of electrolyte used.
The original design, dating back to the 1970s, uses a dry solid polymer electrolyte only. This
electrolyte resembles a plastic-like film that does not conduct electricity but allows an
exchange of ions (electrically charged atoms or groups of atoms). The polymer electrolyte
replaces the traditional porous separator, which is soaked with electrolyte.
The dry polymer design offers simplifications with respect to fabrication, ruggedness, safety
and thin-profile geometry. There is no danger of flammability because no liquid or gelled
electrolyte is used.
With a cell thickness measuring as little as one millimeter (0.039 inches), equipment
designers are left to their own imagination in terms of form, shape and size. It is possible to
create designs which form part of a protective housing, are in the shape of a mat that can be
rolled up, or are even embedded into a carrying case or piece of clothing. Such innovative
batteries are still a few years away, especially for the commercial market.
Unfortunately, the dry Li-polymer suffers from poor conductivity. Internal resistance is too high
and cannot deliver the current bursts needed for modern communication devices and
spinning up the hard drives of mobile computing equipment. Although heating the cell to 60°C
(140°F) and higher increases the conductivity to acceptable levels, this requirement is
unsuitable in commercial applications.
Research is continuing to develop a dry solid Li-polymer battery that performs at room
temperature. A dry solid Li-polymer version is expected to be commercially available by 2005.
It is expected to be very stable; would run 1000 full cycles and would have higher energy
densities than today’s Li-ion battery.
In the meantime, some Li-polymers are used as standby batteries in hot climates. One
manufacturer has added heating elements that keeps the battery in the conductive
temperature range at all times. Such a battery performs well for the application intended
because high ambient temperatures do not affect the service life of this battery in the same
way it does the VRLA, for example.
To make a small Li-polymer battery conductive, some gelled electrolyte has been added.
Most of the commercial Li-polymer batteries used today for mobile phones are a hybrid and
contain gelled electrolyte. The correct term for this system is ‘Lithium Ion Polymer’. For
promotional reasons, most battery manufacturers mark the battery simply as Li-polymer.
Since the hybrid lithium polymer is the only functioning polymer battery for portable use today,
we will focus on this chemistry
With gelled electrolyte added, what then is the difference between Li-ion and Li-ion polymer?
Although the characteristics and performance of the two systems are very similar, the Li-ion
polymer is unique in that it uses a solid electrolyte, replacing the porous separator. The gelled
electrolyte is simply added to enhance ion conductivity.
Technical difficulties and delays in volume manufacturing have deferred the introduction of
the Li-ion polymer battery. This postponement, as some critics argue, is due to ‘cashing in’ on
the Li-ion battery. Manufacturers have invested heavily in research, development and
equipment to mass-produce the Li-ion. Now businesses and shareholders want to see a
return on their investment.
In addition, the promised superiority of the Li-ion polymer has not yet been realized. No
improvements in capacity gains have been achieved — in fact, the capacity is slightly less
than that of the standard Li-ion battery. For the present, there is no cost advantage in using
the Li-ion polymer battery. The thin profile has, however, compelled mobile phone
manufacturers to use this promising technology for their new generation handsets.
One of the advantages of the Li-ion polymer, however, is simpler packaging because the
electrodes can easily be stacked. Foil packaging, similar to that used in the food industry, is
being used. No defined norm in cell size has been established by the industry.
Advantages and Limitations of Li-ion Polymer Batteries
Very low profile — batteries that resemble the profile of a credit card
Flexible form factor — manufacturers are not bound by standard cell
formats. With high volume, any reasonable size can be produced
Light weight – gelled rather than liquid electrolytes enable simplified
packaging, in some cases eliminating the metal shell.
Improved safety — more resistant to overcharge; less chance for
Lower energy density and decreased cycle count compared to Li-ion
— potential for improvements exist.
Expensive to manufacture — once mass-produced, the Li-ion
polymer has the potential for lower cost. Reduced control circuit
offsets higher manufacturing costs.