Electrolytes for thin layer electrochemical devices
AssigneeI-Ten
InventorFabien GABEN
Life of this patent
Estimating the term…
Abstract
Thin-layer electrolyte in an electrochemical device such as a lithium-ion battery, said electrolyte comprising a porous inorganic layer impregnated with a phase carrying lithium ions, characterized in that said porous inorganic layer has an interconnected network of open pores.
Claims22
Thin-layer electrolyte (13, 23) in an electrochemical device such as a lithium-ion battery, said electrolyte comprising a porous inorganic layer impregnated with a phase carrying lithium ions, characterized in that said porous inorganic layer has an interconnected network of open pores.
Method for manufacturing a thin-layer electrolyte (13, 23) deposited on an electrode (12, 22), said layer being preferably free of organic binder and preferably having a porosity, preferably mesoporous, greater than 30% by volume, and more preferably comprised between 30% and 50% by volume, and said layer having pores with an average diameter D50 less than 100 nm, preferably less than 80 nm and preferably less than 50 nm,
- said method being characterized in that:
- (a) a colloidal suspension is provided, containing aggregates or agglomerates of nanoparticles of at least one inorganic material, said aggregates or agglomerates having an average diameter comprised between 80 nm and 300 nm (preferably between 100 nm to 200 nm),
- (b) an electrode (12, 22) is provided,
- (c) a porous inorganic layer is deposited on said electrode by electrophoresis, by ink-jet, by doctor blade, by roll coating, by curtain coating or by dip-coating, from a suspension of particles of inorganic material obtained in step (a);
- (d) said porous inorganic layer is dried, preferably in an airflow to obtain a porous inorganic layer;
- (e) said porous inorganic layer is treated by mechanical compression and/or heat treatment,
- (f) said porous inorganic layer obtained in step (e) is impregnated with a phase carrying lithium ions.
Method for manufacturing a thin-layer electrolyte (13, 23) deposited on an electrode, said layer being preferably free of organic binder and preferably having a porosity, preferably mesoporous, greater than 30% by volume, and more preferably comprised between 30% and 50% by volume, and said layer having pores with an average diameter D50 less than 100 nm, preferably less than 80 nm, preferably less than 50 nm, said method being characterized in that:
- (a1) a colloidal suspension is provided including nanoparticles of at least one inorganic material P with a primary diameter D50 less than or equal to 50 nm;
- (a2) the nanoparticles present in said colloidal suspension are destabilized so as to form aggregates or agglomerates of particles with an average diameter comprised between 80 nm and 300 nm, preferably between 100 nm and 200 nm, said destabilization being done preferably by adding a destabilizing agent such as a salt, preferably LiOH;
- (b) an electrode is provided;
- (c) a porous inorganic layer is deposited on said electrode by electrophoresis, by ink-jet, by doctor blade, by roll coating, by curtain coating or by dip-coating, from said colloidal suspension comprising the aggregates or agglomerates of particles of at least one inorganic material obtained in step (a2);
- (d) the porous inorganic layer is dried, preferably in an airflow to obtain a porous inorganic layer;
- (e) said porous inorganic layer is treated by mechanical compression and/or heat treatment,
- (f) said porous inorganic layer obtained in step (e) is impregnated with a phase carrying lithium ions.
Dependencies are inferred from the claim text.