Renata-sa Chemistry and Construction Manuel d'utilisateur

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38
www.renata.com
Chemistry and Construction
Chemistry of RENATA Li/MnO
2
cells
Renata CR lithium coin cells use a non-aqueous,
aprotic organic electrolyte containing lithium per-
chlorate in a mixture of organic solvents. The pro-
p
rietary formulation of the active cathode material
consists of a heat-treated mixture of electrolytic
MnO
2
and other specific components, yielding an
outstanding volume/capacity ratio for this Li/MnO
2
system.
The cell reactions for this electrochemical system
are:
Anode: Li –> Li
+
+ e
-
Cathode: Mn
IV
O
2
+ Li
+
+ e
-
–> Mn
III
O
2
(Li
+
)
Overall cell reaction: Li + Mn
IV
O
2
–> Mn
III
O
2
(Li
+
)
Manganese dioxide is reduced from the
tetravalent to the trivalent state by lithium.
The separator system in Renata coin cells is
e
specially designed to ensure the best
performance in terms of mechanical strength, ion
p
ermeability over a wide temperature range
(-40 to +100°C) and a low self-discharge rate.
Additional care in cell design also minimizes
self-discharge rate.
The combination of these several features
provides the best performance for long life
applications (back-up etc.)
Separator
Gasket Anode
(Lithium)
Absorbent
Layer and
Electrolyte
Cathode
(MnO
2
)
Cup
Contact
Lid
Contact
Separator
Gasket
Current Collector
Anode (Lithium)
Absorbent Layer and
Electrolyte
Cathode (MnO
2
)
Cup Contact
Lid Contact
Construction of RENATA Li/MnO
2
cells
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Page 1 - Chemistry and Construction

38www.renata.comChemistry and ConstructionChemistry of RENATA Li/MnO2cells Renata CR lithium coin cells use a non-aqueous,aprotic organic electrolyte

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