新製程DPG石墨吸附電解質分解之氣體及其提昇鋰離子二次電池性能之研究(I)
Date Issued
2002
Date
2002
Author(s)
李源弘
DOI
902212E002235
Abstract
Electronic products are more important
day by day; the performances of their relative
components are needed to be much better.
And electrochemical storage devices also can
keep up with world’s trend, which are
towards “light”, “thin”, “short”, and “small”.
Li-ion rechargeable battery owns many
advantages of high energy density, long
cycles, and light weight, and consequently its
security is very important. Under overcharge
and overdischarge, electrolyte of Li-ion
rechargeable battery is often decomposed to
produce many kinds of gases. According to
the reports, Li-ion rechargeable battery being
on its performance, the amount of gases
found to be 5 to 20 times more than after
charge and discharge. Especially during its
overdischarge, a great deal of gases result in
high pressure and circuit. In the meantime,
the resistance of Li-ion rechargeable battery
increases apparently and put the battery into
the dangerous situation. In order to avoid
these dangers, it is necessary for these gases
with dealing properly somehow.
The artificial graphite manufactured in
our laboratory has been investigated. It
possesses natural derivative fullerenes ( C60 )
and Carbon Nanotube ( CNT ). And both of
these two special structures could absorb a
great deal of gases from decomposing
electrolyte to decrease pressure. Besides, the
energy density of the artificial graphite with
C60 and CNT is higher than conventional
artificial graphite even over theoretical
3
energy density 372mAh/g. Therefore, the
artificial graphite from our laboratory and
has been investigated, owns not only high
energy density but also excellent security.
Subjects
artificial graphite
Publisher
臺北市：國立臺灣大學材料科學與工程學研究所
Type
report
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