US 12,294,074 B2
Anode slurry
Hideki Hagiwara, Nagoya (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Mar. 31, 2022, as Appl. No. 17/710,057.
Claims priority of application No. 2021-067544 (JP), filed on Apr. 13, 2021.
Prior Publication US 2022/0328801 A1, Oct. 13, 2022
Int. Cl. H01M 4/04 (2006.01); H01M 4/38 (2006.01)
CPC H01M 4/0416 (2013.01) [H01M 4/386 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An anode slurry for an all solid state battery, the anode slurry comprising:
a Si-based anode active material, a first dispersion medium, and a second dispersion medium; and
the anode slurry satisfying:
(i) when a hydrogen bond term σH of Hansen solubility parameter of the Si-based anode active material, the first dispersion medium, and the second dispersion medium are respectively regarded as σHSi, σH1 and σH2, and
when ΔσH1=σHSi−σH1, and ΔσH2=σHSi−σH2, the ratio ΔσH2/ΔσH1, which is a ratio of ΔσH2 with respect to ΔσH1 is 0.96 or less;
(ii) when T1 designates a boiling point of the first dispersion medium, and T2 designates a boiling point of the second dispersion medium, T2−T1≥−3° C.;
(iii) when W1 designates a weight of the first dispersion medium, and W2 designates a weight of the second dispersion medium, 0.1≤W2/(W1+W2)≤0.25; and
(iv) the first dispersion medium is mesitylene, diisobutyl ketone (DIBK), or butyl butyrate, wherein:
when the first dispersion medium is mesitylene, the second dispersion medium comprises at least one of tetralin, DIBK, methyl benzoate, dimethyl acetoamide, or benzyl alcohol:
when the first dispersion medium is DIBK, the second dispersion medium comprises at least one of butyl butyrate, methyl benzoate, dimethyl acetoamide, or benzyl alcohol; and
when the first dispersion medium is butyl butyrate, the second dispersion medium comprises at least one of dimethyl acetoamide or benzyl alcohol.