公开(公告)号：US20210218005A1

公开(公告)日：2021-07-15

申请号：US16737978

申请日：2020-01-09

Applicant: Storedot Ltd.

Inventor： Eynat MATZNER ,  Daniel ARONOV

IPC: H01M2/16 ,  H01M10/0525 ,  H01M4/04

Abstract: Lithium ion batteries, cell stacks, separators and methods of producing thereof are provided. Separators comprise lithium coating on at least a part of a separator sheet, possibly with a protective layer made of a soluble polymer that covers the lithium coating from one or both sides of the separator sheet. Cell stacks are assembled with disclosed separators, in ways that may physically attach the lithium coating to the electrodes (anode(s) and/or cathode(s)) to prelithiate or lithiate them, respectively; and/or electrochemical processes may be used to deliver lithium from the coating to the respective electrodes. Disclosed methods increase the energy capacity and the stability of the formed lithium ion batteries, yielding energy-dense, long-living and fast charging batteries.

公开(公告)号：US20210210754A1

公开(公告)日：2021-07-08

申请号：US16732506

申请日：2020-01-02

Applicant: Storedot Ltd.

Inventor： Eran SELLA ,  Eynat MATZNER ,  Tal CHEN ,  Michael KULBAK

IPC: H01M4/38 ,  C09C3/06 ,  H01M4/54 ,  H01M10/0525 ,  H01M4/62

Abstract: Methods of preparing Si-based anode slurries and anode made thereof are provided. Methods comprise coating silicon particles within a size range of 300-700 nm by silver and/or tin particles within a size range of 20-500 nm, mixing the coated silicon particles with conductive additives and binders in a solvent to form anode slurry, and preparing an anode from the anode slurry. Alternatively or complementarily, silicon particles may be milled in an organic solvent, and, in the same organic solvent, coating agent(s), conductive additive(s) and binder(s) may be added to the milled silicon particles—to form the Si-based anode slurry. Alternatively or complementarily, milled silicon particles may be mixed, in a first organic solvent, with coating agent(s), conductive additive(s) and binder(s)—to form the Si-based anode slurry. Disclosed methods simplify the anode production process and provide equivalent or superior anodes.

公开(公告)号：US20210210741A1

公开(公告)日：2021-07-08

申请号：US16735737

申请日：2020-01-07

Applicant: Storedot Ltd.

Inventor： Ivgeni SHTERENBERG ,  Eran SELLA ,  Eynat MATZNER ,  Shirel COHEN ,  Hadar MAZOR SHAFIR ,  Daniel ARONOV

IPC: H01M4/04 ,  H01M4/1395 ,  H01M4/38 ,  H01M10/0525 ,  H01M10/02

Abstract: Prelithiation methods and fast charging lithium ion cell are provided, which combine high energy density and high power density. Several structural and chemical modifications are disclosed to enable combination of features that achieve both goals simultaneously in fast charging cells having long cycling lifetime. The cells have anodes with high content of Si, Ge and/or Sn as principal anode material, and cathodes providing a relatively low C/A ratio, with the anodes being prelithiated to have a high lithium content, provided by a prelithiation algorithm. Disclosed algorithms determine lithium content achieved through prelithiation by optimizing the electrolyte to increase cycling lifetime, adjusting energy density with respect to other cell parameters, and possibly reducing the C/A ratio to maintain the required cycling lifetime.