Process to reduce capacity loss during first cycle

Process to reduce capacity loss during
first cycle
CONTEXT
Notre référence :
03402-01
During the first cycling of a lithium-ion batterie, a solid electrolyte interface (SEI) is formed
on the negative anode (graphite is the most used anode material).
The SEI formation protect the anode but one drawback is that lithium ion are used to form
this SEI resulting in a loss of capacity for the battery.
Status des brevets
TECHNICAL DESCRIPTION
Priority patent of
invention n°
FR1054804 filed in
June 6th, 2010, entitled
" Procédé pour
l’élaboration d’une
batterie au lithium ou
sodium”
The invention relates to a composite electrode which includes a mixture of active material
particles (AM) and particles constituted with a material generating an electronic co The
invention proposes to use sacrificial salt that during the first cycle will be oxidized
producing by this way alkali ion such as lithium. This lithium will then be used to form the
SEI, avoiding or reducing the loss of capacity.
Salts are chosen in order to produce only gases as byproduct of oxidation. These gases
will then be eliminated of the system. LIB are generally sealed after the first cycle to allow
gases formed by the electrolyte reduction due to the formation of the SEI to be
evacuated.
BENEFITS
Reduced loss due to SEI formation during first cycle.
Production of porosity in the cathode which favors fast cinetic.
Inventeurs
INDUSTRIAL APPLICATIONS
Michel ARMAND
JeanMarie TARASCON
Stéphane LARUELLE
Sylvie GRUGEON
Shanmukaraj DEVARAJ
Status Commercial
Exclusive or nonexclusive license
Laboratoires
Formation of LIB
For further information, please contact us (Ref 03402-01)
Laboratoire de
Réactivité et Chimie des
Solides, (LRCS
UMR6007) Amiens,
France.
Mots clés :
SEI formation
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