The difference between lithium polymer battery and general lithium ion battery. Posted by benzoenergy.com
1. General lithium ion battery
The
general lithium-ion battery is commonly known as "lithium battery",
which is currently a battery system with relatively good overall
performance. The negative electrode of a lithium-ion battery is a carbon
material, such as graphite. The positive electrode is a transition
metal oxide containing lithium, such as LiMn2O4.
(1) Advantages of lithium ion batteries:
①The working voltage is high. The working voltage of lithium-ion battery is 3.6V, which is three times that of nickel-cadmium and nickel-hydrogen batteries.
②The
specific energy is high. The specific energy of lithium-ion batteries
has reached 140Wh/kg, which is 3 times that of nickel-cadmium batteries
and 1.5 times that of nickel-hydrogen batteries.
③Long
cycle life. At present, the cycle life of lithium-ion batteries has
reached more than 1,000 times, and can reach tens of thousands of times
under low-depth discharge, which exceeds that of other secondary
batteries.
④Small
self-discharge. The monthly self-discharge rate of lithium-ion batteries
is only 6-8%, which is much lower than nickel-cadmium batteries
(25-30%) and nickel-hydrogen batteries (30-40%).
⑤ No memory effect. It can be charged at any time as needed without reducing battery performance.
⑥ No pollution to the environment. Lithium-ion batteries do not contain harmful substances and are veritable "green batteries".
2. Lithium polymer battery
Lithium polymer batteries
are a new generation of batteries that entered the market in large
quantities in 1999. Lithium polymer batteries are basically the same as
lithium ion batteries, except that the electrolyte of lithium polymer
batteries is a solid polymer rather than a liquid electrolyte. The
electrolyte material of a polymer battery is a thin film generally
composed of a melt, in which the main polymer such as polyethylene oxide
is used as a non-flowing solvent. The advantage of the lithium polymer
battery is that it can be made into any shape and is relatively light
because it does not contain heavy metals and has a plastic casing to
prevent electrolyte leakage. Their performance is better and safer, and
the ideal state of the lithium polymer battery capacity can reach
several thousand milliamperes. The solid electrolyte is like a sealant
and will not easily decompose naturally during the charging process.
3. Comparison of the two batteries
Both
lithium polymer batteries and lithium ion battery technologies can
replace Ni-Gd batteries. But the price is too high, the market has not
yet fully accepted, especially the lithium polymer technology.
Decomposer Brush of Darnell Group believes that polymer batteries will
not always be more expensive than lithium-ion batteries, but the current
processing conditions are much more expensive, which promotes the
development of lithium-ion battery technology. In the past, the cost of
lithium-ion batteries used in notebook computers was US$41.42, and the
cost of polymer batteries used in notebook computers was US$60.80.
The capacity of lithium polymer
battery is larger than that of lithium ion battery under the same
volume, and there is no memory effect at all (lithium ion battery still
has memory effect, but it is relatively small). Lithium polymer
batteries are actually a gel-like substance that can be easily made into
various shapes. And it does not contain harmful heavy metal elements,
which is a "green battery".
BENZO Energy Technology Co.,Ltd
UFine Technology Co., Ltd
Site: www.bz-battery.com / www.benzoenergy.com
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