US 12,148,929 B2
Binder solution having lithium ion conductivity for all-solid-state battery and electrode slurry comprising same
Sang Mo Kim, Hwaseong-si (KR); Jae Min Lim, Suwon-si (KR); Sang Heon Lee, Yongin-si (KR); Tae Young Kwon, Daegu (KR); Hoon Seok, Suwon-si (KR); Yoon Seok Jung, Seoul (KR); Kyu Tae Kim, Bucheon-si (KR); and Dae Yang Oh, Hwaseong-si (KR)
Assigned to HYUNDAI MOTOR COMPANY, Seoul (KR); KIA MOTORS CORPORATION, Seoul (KR); and INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY, Seoul (KR)
Filed by HYUNDAI MOTOR COMPANY, Seoul (KR); KIA MOTORS CORPORATION, Seoul (KR); and INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY, Seoul (KR)
Filed on Nov. 9, 2020, as Appl. No. 17/092,927.
Claims priority of application No. 10-2019-0174626 (KR), filed on Dec. 26, 2019.
Prior Publication US 2021/0202949 A1, Jul. 1, 2021
Int. Cl. H01M 4/62 (2006.01); H01M 10/0562 (2010.01)
CPC H01M 4/622 (2013.01) [H01M 10/0562 (2013.01)] 8 Claims
 
1. A binder solution for an all-solid-state battery, comprising:
a first binder having a lithium ion conductivity;
a second binder having a lithium ion conductivity higher than the lithium ion conductivity of the first binder;
a lithium salt; and
an organic solvent that dissolves the lithium salt,
wherein the first binder comprises nitrile-butadiene rubber (NBR),
wherein the second binder is selected from the group consisting of poly(propylene carbonate) (PPC), poly(vinyl acetate) (PVA), poly(1,4-butylene adipate) (PBA) and combinations thereof,
wherein the lithium ion conductivity (σ1) of the first binder is 10−6 S/cm to 10−7 S/cm,
wherein the lithium ion conductivity (σ2) of the second binder is 4×10−4 S/cm to 10−5 S/cm,
wherein a weight ratio (m2/m1) of the second binder and the first binder is 3 or less but greater than 0,
wherein the lithium salt is selected from the group consisting of lithium hexafluorophosphate (LiPF6), lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium bis(pentafluoroethanesulfonyl)imide (LiBETI), and combinations thereof,
wherein the second binder is miscible with the first binder, the lithium salt, and the organic solvent,
wherein the binder solution comprises:
10 wt % or less but exceeding 0 wt % of the first binder and the second binder;
0.5 wt % to 3 wt % of the lithium salt; and
a remainder of the organic solvent,
wherein the organic solvent is the remainder of the binder solution, whereby the wt % of the first binder and second binder, wt % of the lithium salt, and wt % of the organic solvent sum to 100 wt %.