What is a lithium battery separator? What are the constituent materials of lithium battery separators? Posted by benzoenergy.com
In the structure of lithium batteries, the diaphragm is one of the key internal components. The performance of the lithium battery separator determines the battery's interface structure, internal resistance, etc., which directly affect the battery's capacity, cycle and safety performance. A separator with excellent performance plays an important role in improving the overall performance of the battery.
What is a lithium battery separator?
The
lithium battery separator is located between the positive and negative
electrodes, and its main function is to separate the positive and
negative active materials to prevent the two electrodes from being
short-circuited due to contact; in addition, during the electrochemical
reaction, it can maintain the necessary electrolyte to form a channel
for ion movement . The diaphragm material is non-conductive, and
different types of lithium batteries use different diaphragms.
What are the constituent materials of lithium battery separators?
According
to different physical and chemical properties, lithium battery
separator materials can be divided into woven membranes, non-woven
membranes (non-woven fabrics), microporous membranes, composite
membranes, membrane paper, laminated membranes, etc.
Polyolefin
materials have excellent mechanical properties, chemical stability and
relatively inexpensive characteristics. Therefore, in the early stage of
lithium battery development, polyolefin microporous membranes such as
polyethylene and polypropylene have been used as lithium battery
separators. Although in recent years there have been studies using other
materials to prepare lithium battery separators, such as the phase
inversion method using polyvinylidene fluoride (PVDF) as the bulk
polymer to prepare lithium battery separators, and the use of cellulose
composite membranes as lithium battery separator materials.
However,
the diaphragm materials on the market are mainly polyolefin diaphragms
based on polyethylene and polypropylene. Among them, polyethylene
products are dominated by wet process, and polypropylene products are
dominated by dry process.
What are the types of lithium battery separators?
Lithium battery
separators can be divided into different types according to their
structure and composition. At present, there are mainly three types that
are more common in the market, namely porous polymer membranes,
non-woven membranes and inorganic composite membranes.
Porous
polymer diaphragm: refers to a lithium battery diaphragm with uniform
pore distribution prepared by mechanical method, thermally induced phase
separation method, immersion precipitation method and other methods.
Non-woven
diaphragm: It is composed of oriented or random fibers, usually
combined with organic matter or ceramic gel to obtain a lithium battery
diaphragm with better chemical and physical properties.
Inorganic composite membrane: Most lithium battery separators are composed of inorganic nanoparticles and polymers.
As
an important internal component of lithium batteries, lithium battery
separators have broad development prospects, and their production
technology will also be improved.
BENZO Energy Technology Co.,Ltd
UFine Technology Co., Ltd
Site: www.bz-battery.com / www.benzoenergy.com
Comments
Post a Comment