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US 5,964,903 AGranted
Method of preparing electrochemical cells
AssigneeValence Technology, Inc.
InventorsFeng Gao, Porter H. Mitchell, Jeremy Barker
Life of this patent
Estimating the term…
Abstract
A method of fabricating electrochemical cells employing novel plasticizers that can be removed by evaporation under vacuum is provided thereby obviating the need for solvent extraction. The plasticizers comprise 2-(2-ethoxyethoxy) ethyl acetate, dimethyl adipate, dibutyl phthalate, propylene carbonate, and mixtures thereof.
Claims33
A method of preparing an electrochemical cell comprising the steps of:
- (a) preparing an anode precursor by forming an anode film comprising a carbon material, a first polymeric binder, and a first plasticizer and thereafter removing said first plasticizer;
- (b) preparing a cathode precursor by forming a cathode film comprising a cathodic material, a second polymeric binder, and a second plasticizer and thereafter removing said second plasticizer;
- (c) preparing a polymeric electrolyte precursor by forming a polymeric matrix comprising a third plasticizer and thereafter removing said third plasticizer;
- and
- (d) activating said anode precursor, said cathode precursor, and said polymeric electrolyte precursor, wherein said polymeric electrolyte precursor is positioned between said anode precursor and said cathode precursor, and wherein at least in one of steps (a), (b), or (c), said plasticizer is removed by evaporation under vacuum.
2 more elements
A method of preparing an electrochemical cell comprising the steps of:
- (a) forming an anode film comprising anode active material, a polymeric binder and a first plasticizer;
- (b) forming a cathode film comprising a cathode active material, a polymeric binder and a second plasticizer;
- (c) forming a polymeric layer comprising a third plasticizer;
- (d) positioning said polymeric layer between said anode film and said cathode film to form a tri-layer structure;
- (e) removing said plasticizers from the tri-layer structure by evaporation under vacuum to form an electrochemical cell precursor;
- and
- (f) activation said electrochemical cell precursor to form an electrochemical cell.
4 more elements
A method of preparing an electrochemical cell comprising the sequential steps of:
- (a) forming an anode film comprising anode active material, a polymeric binder and a first plasticizer;
- (b) forming a cathode film comprising a cathode active material, a polymeric binder and a second plasticizer;
- (c) forming a polymeric layer comprising a third plasticizer;
- (d) positioning said polymeric layer between said anode film and said cathode film to form a tri-layer structure;
- (e) removing said plasticizers from the tri-layer structure by evaporation under vacuum to form an electrochemical cell precursor;
- and
- (f) activation said electrochemical cell precursor to form an electrochemical cell.
4 more elements
A method of preparing an electrochemical cell comprising the steps of:
- (a) preparing an anode precursor by forming an anode film comprising a carbon material, a first polymeric binder, and a first plasticizer and thereafter removing said first plasticizer;
- (b) preparing a cathode precursor by forming a cathode film comprising a cathodic material, a second polymeric binder, and a second plasticizer and thereafter removing said second plasticizer;
- (c) preparing a polymeric electrolyte precursor by forming a polymeric matrix comprising a third plasticizer and thereafter removing said third plasticizer;
- (d) laminating said polymeric electrolyte precursor to said anode precursor and to said cathode precursor wherein said polymeric electrolyte precursor is positioned between said anode precursor and said cathode precursor;
- and, thereafter,
- (e) activating said anode precursor, said cathode precursor, and said polymeric electrolyte precursor, wherein at least in one of steps (a), (b), or (c), said plasticizer is removed by evaporation under vacuum.
3 more elements
A method of preparing an electrochemical cell comprising the steps of:
- (a) forming an anode film comprising anode active material, a polymeric binder and a first plasticizer;
- (b) forming a cathode film comprising a cathode active material, a polymeric binder and a second plasticizer;
- (c) forming a polymeric layer comprising a third plasticizer;
- (d) positioning said polymeric layer between said anode film and said cathode film to form a tri-layer structure;
- (e) laminating said polymeric layer to said anode film and to said cathode film;
- and thereafter,
- (f) removing said plasticizers from the tri-layer structure by evaporation under vacuum to form an electrochemical cell precursor;
- and
- (g) activation said electrochemical cell precursor to form an electrochemical cell.
6 more elements
Dependencies are inferred from the claim text.