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vovan1 · Vielschreiber Beiträge: 240

Koiche poiskal na chemiu ,pravda na Angliskom,no bous
eto dasche mne trudno perevesti

A stable polyradical, poly (2,2,6,6-tetramethylpiperidinyloxy
methacrylate)(PTMA), was synthesized, and its structure was determined
by infrared, ultraviolet-visible, and ESR spectroscopy. Cyclic
voltammograms of the PTMA polyradical electrodes were obtained by using
a three-electrode cell at a scan rate of 5 mV/s within a potential
range of 3.2–4.0 V. The results show that the shape of oxidation peak
is very similar to that of reduction peak, and oxidation peak current
is equal to the corresponding reduction peak current, which suggest
that PTMA possesses an excellent reversibility. The difference of the
anodic peak potential (E
_a,p=3.66 V, vs Li/Li⁺) and cathodic peak potential(E
_c,p=3.58 V, vs Li/Li⁺)
is estimated at 80 mV, which is extremely less than that of the other
organic positive materials in lithium second batteries such as
organosulfide compounds, leading to a capability for high current
capability in the charging and discharging process of the battery. The
maximum discharge specific capacity of PTMA is 78.4 mA · h/g at the
constant discharge current of 0.3 mA (0.2 C rate), the coulombic
efficiency is about 95%, and the charging and discharging curves of the
batteries have an obvious plateau at 3.65 V and 3.56 V, respectively.
The discharging specific capacity of the battery decreased is about 2%
after 100 cycles. The PTMA/Li button batteries exhibite an excellent
stability.

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