公开(公告)号：US20200255557A1

公开(公告)日：2020-08-13

申请号：US16711484

申请日：2019-12-12

Applicant: Storedot Ltd.

Inventor： Eran SELLA ,  Maxim KAGAN ,  Ekaterina GOTLIB VAINSHTEIN

IPC: C08F20/06 ,  H01M4/38 ,  H01M4/62 ,  H01M10/0525

Abstract: Li-PAA (lithium poly(acrylic acid)) powders, electrode binders and methods of preparation thereof are provided. The Li-PAA powders have a low PDI (polydispersity index), e.g., smaller than 4 or 5, possibly a high Mw, and are configured to have a lithium content of above 7%, a pH between 8.5 and 9.5, or between 8.7 and 9.1 when dissolved 15% w/w in water and/or possibly a white color. Preparation methods comprise adding a PAA solution into a LiOH solution and stirring a resulting Li-PAA solution, and precipitating Li-PAA from the resulting Li-PAA solution, sieving or filtering and then drying the precipitated Li-PAA to yield the Li-PAA powder, which may be used as binder for forming electrodes. Advantageously, resulting electrodes are uniform and mechanically stable when used with metalloid anode material particles which exhibit high expansion and contraction when used in fast charging lithium ion batteries.

公开(公告)号：US20180261819A1

公开(公告)日：2018-09-13

申请号：US15978202

申请日：2018-05-14

Applicant: StoreDot Ltd.

Inventor： Ekaterina GOTLIB VAINSHTEIN ,  Daniel ARONOV

IPC: H01M2/16 ,  H01M10/04 ,  H01M4/04 ,  H01M10/0585 ,  H01M10/0525 ,  H01M2/02

CPC classification number: H01M2/1673 ,  H01M2/0275 ,  H01M2/168 ,  H01M2/1686 ,  H01M4/0402 ,  H01M4/0404 ,  H01M4/0435 ,  H01M10/0404 ,  H01M10/0436 ,  H01M10/0468 ,  H01M10/0525 ,  H01M10/0585

Abstract: Methods, stacks and electrochemical cells are provided, in which the cell separator is surface-treated prior to attachment to the electrode(s) to form binding sites on the cell separator and enhance binding thereof to the electrode(s), e.g., electrostatically. The cell separator(s) may be attached to the electrode(s) by cold press lamination, wherein the created binding sites are configured to stabilize the cold press lamination electrostatically—forming flexible and durable electrode stacks. Electrode slurry may be deposited on a sacrificial film and then attached to current collector films, avoiding unwanted interactions between materials and in particular solvents involved in the respective slurries. Dried electrode slurry layers may be pressed or calendared against each other to yield thinner, smother and more controllably porous electrodes, as well as higher throughput. The produced stacks may be used in electrochemical cells and in any other type of energy storage device.

公开(公告)号：US20180175355A1

公开(公告)日：2018-06-21

申请号：US15846246

申请日：2017-12-19

Applicant: STOREDOT LTD.

Inventor： Ekaterina GOTLIB VAINSHTEIN ,  Daniel ARONOV

IPC: H01M2/16 ,  H01M10/0525 ,  H01M10/04 ,  H01M2/02 ,  H01M10/0585 ,  H01M4/04

CPC classification number: H01M2/1673 ,  H01M2/0275 ,  H01M4/0402 ,  H01M4/0435 ,  H01M10/0404 ,  H01M10/0468 ,  H01M10/0525 ,  H01M10/0585

Abstract: Methods, stacks and electrochemical cells are provided, in which the cell separator is surface-treated prior to attachment to the electrode(s) to form binding sites on the cell separator and enhance binding thereof to the electrode(s), e.g., electrostatically. The cell separator(s) may be attached to the electrode(s) by cold press lamination, wherein the created binding sites are configured to stabilize the cold press lamination electrostatically—forming flexible and durable electrode stacks. Electrode slurry may be deposited on a sacrificial film and then attached to current collector films, avoiding unwanted interactions between materials and in particular solvents involved in the respective slurries. Dried electrode slurry layers may be pressed or calendared against each other to yield thinner, smother and more controllably porous electrodes, as well as higher throughput. The produced stacks may be used in electrochemical cells and in any other type of energy storage device.