Anode For A Cell Of A Lithium Ion Battery, Its Manufacturing Process And The Battery Incorporating It
Abstract:
The invention relates to an anode usable in a cell
of a lithium-ion battery comprising an electrolyte
based on a lithium salt and a non-aqueous solvent, to a
process for manufacturing this anode and to a lithiumion
battery having one or more cells incorporating this
anode.
This anode is based on a polymer. composition,
obtained by melt processing and without solvent
evaporation, that is the product of a hot compounding
reaction between an active material and additives
comprising a polymer binder and an electrically
conductive filler.
According to the invention, the binder is based on
at least one crosslinked elastomer and the additives
furthermore comprise at least one non-volatile organic
compound usable in the electrolyte solvent, the
composition advantageously comprising said active
material in a mass fraction greater than or equal to
85%.
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Notices, Deadlines & Correspondence
LA VERDIERE, 54, RUE GUSTAVE MATHIEU, 77590 BOIS-LE-ROI, FRANCE
2. AYME-PERROT DAVID
30 RUE DES ETANGS, 68330 HUNINGUE,FRANCE
3. DUFOUR BRUNO
7 RUE DE GRAVILLE, 77430 CHAMPAGNE SUR SEINE, FRANCE
4. SONNTAG PHILIPPE
4TER RUE BASSES LOGES, 77210 AVON, FRANCE
Specification
ANODE FOR A CELL OF A LITHIUM-ION BATTERY, ITS
MANUFACTURING PROCESS AND THE BATTERY INCORPORATING IT
5 The present invention relates to an anode that can
be used in a cell of a lithium-ion battery, to a
process for manufacturing this anode, and to a lithiumion
battery having one or more cells incorporating this
anode.
10 There are two main types of lithium storage
battery: lithium-metal batteries, where the negative
electrode is made of lithium metal (which material
causes problems with safety when in the presence of a
liquid electrolyte), and lithium-ion batteries, where
15 the lithium remains in the ionic state.
Lithium-ion batteries consist of at least two
conductive Coulombic electrodes of different
polarities, the negative electrode or anode and the
positive electrode or cathode, between which electrodes
20 a separator is located, which separator consists of an
electrical insulator imbibed with an aprotic
electrolyte based on ~ i +ca tions ensuring the ionic
conductivity. The electrolytes used in these lithiumion
batteries usually consist of a lithium salt, for
25 example of formula LiPF6, LiAsF6, LiCF3S03 or LiC104,
which is dissolved in a mixture of non-aqueous solvents
such as acetonitrile, tetrahydrof uran, or more of ten a
carbonate, for example of ethylene or propylene.
The active material of the anode of a lithium-ion
30 battery is typically graphite (capacity of 370 mAh/g
and redox potential of 0.05 V relative to the ~ i + / ~ i
couple) or, as a variant, mixed metal oxides, among
which are included the lithiated titanium oxides of
formula Li4Ti5OI,2 LiXTiO2, or even compounds, for
35 example, of formula LixCuV04, LixSn02, LixMo02, Li,MoS2,
where 0