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.