Dynamic charge acceptance in lead acid batteries
AssigneeCabot Corporation
InventorsYu-Hua Kao, Agathagelos Kyrlidis, Persefoni E. Kechagia, Paolina Atanassova, Tushar Shah
Life of this patent
Estimating the term…
Abstract
A carbon-based additive for negative active materials includes carbon nanostructures free of a fiber substrate, carbon nanostructures fused to a fiber substrate or any combination thereof. In many cases, the carbon-based additive further includes carbon black. The additive is used to prepare electrode compositions for lead acid batteries. Batteries that include such electrode compositions are characterized by improved dynamic charge acceptance and lead utilization, typically at acceptable water loss levels. Some of the batteries described herein exhibit a negligible memory effect.
Claims23
An electrode composition, comprising:
- a negative active material for a lead acid battery;
- and
- a carbon-based additive including a first constituent selected from the group consisting of carbon nanostructures free of a growth substrate, a substrate-containing carbon nanostructure material, and any combination thereof, and a second constituent selected from the group consisting of carbon black, conventional carbon nanotubes and any combination thereof,
- wherein the carbon nanostructures include a plurality of multiwall carbon nanotubes that are crosslinked in a polymeric structure by being branched, interdigitated, entangled and/or sharing common walls.
19-25. (canceled)
An electrode composition, comprising:
- a negative active material for a lead acid battery;
- and
- a carbon-based additive including carbon nanostructures and, optionally, a component selected from the group consisting of carbon black, conventional carbon nanotubes and any combination thereof,
- wherein the carbon nanostructures include a plurality of multiwall carbon nanotubes that are crosslinked in a polymeric structure by being branched, interdigitated, entangled and/or sharing common walls.
27-59. (canceled)
An electrode, comprising:
- negative active materials for a lead acid battery and carbon nanostructures,
- wherein the carbon nanostructures include a plurality of multiwall carbon nanotubes that are crosslinked in a polymeric structure by being branched, interdigitated, entangled and/or sharing common walls.
61-79. (canceled)
Dependencies are inferred from the claim text.