ALL-SOLID-STATE LITHIUM BATTERY

• US 20120028128A1
• Filed: 03/18/2010
• Published: 02/02/2012
• Est. Priority Date: 03/18/2009
• Status: Abandoned Application

• Current Assignee: Santoku Corporation (Proterial Ltd.)
• Original Assignee: Santoku Corporation (Proterial Ltd.)
• Inventors: Murota, Tadatoshi, Fujiwara, Tetsu, Seino, Yoshikatsu
• Application Number:
  US13/257,219
• Publication Number:
  US 20120028128A1
• Time in Patent Office: Days
• US Class Current: 429/304
• CPC Class Codes: C01G 45/1228 of the type [MnO2]n- , e.g. LiMnO2, Li[MxMn1-x]O2
• CPC Class Codes: C01G 45/1242 of the type [Mn2O4]-, e.g. LiMn2O4, Li[MxMn2-x]O4
• CPC Class Codes: C01G 51/42 containing alkali metals, e.g. LiCoO2
• CPC Class Codes: C01G 51/50 of the type [MnO2]n- , e.g. Li(CoxMn1-x)O2, Li(MyCoxMn1-x-y)O2
• CPC Class Codes: C01G 53/42 containing alkali metals, e.g. LiNiO2
• CPC Class Codes: C01G 53/50 of the type [MnO2]n- , e.g. Li(NixMn1-x)O2, Li(MyNixMn1-x-y)O2
• CPC Class Codes: C01G 53/54 of the type [Mn2O4]-, e.g. Li(NixMn2-x)O4, Li(MyNixMn2-x-y)O4
• CPC Class Codes: C01P 2002/52 containing elements as dopants
• CPC Class Codes: C01P 2002/54 one element only
• CPC Class Codes: C01P 2004/51 Particles with a specific particle size distribution
• CPC Class Codes: C01P 2004/61 Micrometer sized, i.e. from 1-100 micrometer
• CPC Class Codes: C01P 2006/11 Powder tap density
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C01P 2006/40 Electric properties
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries

Abstract

There is provided an all-solid lithium battery having excellent output characteristics. The battery has a cathode, an electrolyte layer, and an anode. The cathode contains a cathode active material represented by formula (1) and a sulfide solid electrolyte, and the electrolyte layer contains a sulfide solid electrolyte:

Li_aNi_bCo_cMn_dM_eO_f+σ  (1)

(1.01≦a≦1.05; f: 2 or 4; σ: not less than −0.2 and not more than 0.2; M: Mg, Ca, Y, rare earth elements, etc.; provided that when f=2, 0≦b≦1, 0≦c≦1, 0≦d≦1, 0≦e≦0.5, and b+c+d+e=1; when f=4, 0≦b≦2, 0≦c≦2, 0≦d≦2, 0≦e≦1, and b+c+d+e=2).

Claims

1. An all-solid lithium battery comprising a cathode, an electrolyte layer, and an anode,

said cathode comprising a cathode active material represented by the formula (1) and a sulfide solid electrolyte, and said electrolyte layer comprising a sulfide solid electrolyte:

Li_aNi_bCo_cMn_dM_eO_f+σ

 

 

(1)

wherein a is 1.01≦

a≦

1.05;

f is 2 or 4;

a is not less than −

0.2 and not more than 0.2;

M stands for one or more elements selected from Mg, Ca, Y, rare earth elements, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Fe, Cu, Ag, Zn, B, Al, Ga, C, Si, Sn, N, P, S, F, and Cl;

provided that when f is 2, b is 0≦

b≦

1, c is 0≦

c≦

1, d is 0≦

d≦

1, e is 0≦

e≦

0.5, and b+c+d+e=1;

when f is 4, b is 0≦

b≦

2, c is 0≦

c≦

2, d is 0≦

d≦

2, e is 0≦

e≦

1, and b+c+d+e=2.

2. The all-solid lithium battery according to claim 1, wherein said cathode active material is Li_aCoO_2+σ

, Li_aNi<sub>0.8±

0.1</sub>Co<sub>0.15±

0.1</sub>Al<sub>0.05±

0.05</sub>O_2+σ

, Li_aNi<sub>0.8±

0.1</sub>Co<sub>0.2±

0.1</sub>O_2+σ

, Li_aNiO_2+σ

, Li_aMn₂O_4+σ

, Li_aMn<sub>0.5±

0.1</sub>Ni<sub>0.5±

0.1</sub>O_2+σ

, Li_aMn<sub>1.5±

0.1</sub>Ni<sub>0.5±

0.1</sub>O_4+σ

, Li_aMn<sub>0.33±

0.1</sub>Ni<sub>0.33±

0.1</sub>Co<sub>0.33±

0.1</sub>O_2+σ

, or Li_aNi<sub>0.33±

0.1</sub>Co<sub>0.33±

0.1</sub>Mn<sub>0.33±

0.1</sub>Mg<sub>0.05±

0.05</sub>O_2+σ

.

3. The all-solid lithium battery according to claim 1 or 2 claim 1, wherein a is 1.01≦

a≦

1.04.

4. The all-solid lithium battery according to claim 1, wherein a tap density of said cathode active material represented by the formula (1) is not lower than 2.0 g/cm³.

5. The all-solid lithium battery according to claim 1, wherein said cathode active material represented by the formula (1) has been surface-modified with a lithium ion conductive oxide.

6. The all-solid lithium battery according to claim 1, wherein said cathode active material represented by the formula (1) has a particle size of not smaller than 1 μ

m and not larger than 10 μ

m, and a specific surface area of not less than 0.20 m²/g and not more than 0.8 m²/g, and said sulfide solid electrolyte has a particle size of not smaller than 0.01 μ

m and not larger than 50 μ

m.

7. The all-solid lithium battery according to claim 1, wherein said cathode active material represented by the formula (1) has a particle size of not smaller than 4.2 μ

m and not larger than 7.0 μ

m, and a specific surface area of not less than 0.35 m²/g and not more than 0.7 m²/g.

8. The all-solid lithium battery according to claim 1, wherein said cathode active material represented by the formula (1) wherein b=0 comprises secondary particles consisting of a plurality of primary particles, and/or single crystal grains, and wherein A represented by formula (2) is not less than 1 and not more than 10:

A=(m+p)/(m+s) 

 

(2)

wherein m denotes the number of single crystal grains, s denotes the number of secondary particles, and p denotes the number of primary particles constituting the secondary particles.