Two-step pasting of thin electrodes

In a method for preparing electrodes for electrochemical cells in which electrode plates are coated with a damp active paste material and are subsequently dried and wound into a substantially cylindrical configuration, the improvement comprising applying a modifier which mixes with said paste to the plates to improve formation characteristics and reduce self-discharge tendencies, wherein the modifier is a persulfate.

In a method for preparing electrodes for electrochemical cells in which electrode plates are coated with a damp active paste material and are subsequently dried and wound into a substantially cylindrical configuration, the improvement comprising applying a modifier which mixes with said paste to the plates to improve formation characteristics and reduce self-discharge tendencies, wherein the modifier is applied to the electrode plates before the paste material is applied thereto.

In a method for preparing electrodes for electrochemical cells in which electrode plates are coated with a damp active paste material and are subsequently dried and wound into a substantially cylindrical configuration, the improvement comprising applying a modifier which mixes with said paste to the plates to improve formation characteristics and reduce self-discharge tendencies, wherein the modifier is an oxidant.

A method for improving the formation and self-discharge characteristics of battery electrodes, the battery electrodes having thin, non-perforated battery plates coated with thin layers of damp, active material which are subsequently dried and rolled into a cylindrical form, the method including the steps of:

• a) forming an aqueous mixture of a modifier which mixes with the damp, active material to improve formation characteristics and reduce self-discharge tendencies;
• and
• b) applying the modifier to the electrode before drying thereof, whereby the modifier penetrates at least a surface of the layer of active material and mixes therewith.

A method for improving the formation and self-discharge characteristics of battery electrodes, the battery electrodes having thin, non-perforated battery plates coated with thin layers of damp, active material which are subsequently dried and rolled into a cylindrical form, the method including the steps of:

• a) forming an aqueous mixture of a modifier which mixes with the damp, active material;
• and
• b) applying the modifier to the electrode before applying the active material to the plates and before the drying thereof, whereby the modifier penetrates at least a surface of the layer of active material.

A method for improving the formation and self-discharge characteristics of battery electrodes, the battery electrodes having thin, non-perforated battery plates coated with thin layers of damp, active material which are subsequently dried and rolled into a cylindrical form, the method including the steps of:

• a) forming an aqueous mixture of a modifier which mixes with the damp, active material;
• and
• b) applying the modifier to the electrode simultaneously with the active material and before drying thereof, whereby the modifier penetrates at least a surface of the layer of active material.

A method for improving the formation and self-discharge characteristics of battery electrodes, the battery electrodes having thin, non-perforated battery plates coated with thin layers of damp, active material which are subsequently dried and rolled into a cylindrical form, the method including the steps of:

• a) forming an aqueous mixture of a modifier which mixes with the damp, active material;
• and
• b) applying potassium persulfate to the electrode before the drying thereof, whereby potassium persulfate penetrates at least a surface of the layer of active material.

In a method for preparing electrodes for electrochemical cells in which electrode plates are coated with a damp, dryable active paste material and are subsequently dried and wound into a substantially cylindrical configuration, the improvement comprising mixing a modifier into said paste on said plates before drying of the paste takes place to improve formation characteristics and to reduce self-discharge tendencies.