Cathode active material for solid lithium secondary battery, and method for manufacturing cathode active material for solid lithium secondary battery
AssigneeSumitomo Chemical Company, Limited
InventorsTakuya KADOWAKI, Ryo KURIKI
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Abstract
A cathode active material for solid lithium secondary battery is provided, containing a lithium metal composite oxide having a layered crystal structure, and a coating material which coats at least a part of the lithium metal composite oxide, in which the coating material contains an element A, the element A is one or more elements selected from the group consisting of Nb, Ta, Ti, Al, B, P, W, Zr, La, and Ge, and (1) and (2) are satisfied.
Claims18
A cathode active material for solid lithium secondary battery, comprising:
- a lithium metal composite oxide having a layered crystal structure;
- and
- a coating material which coats at least a part of the lithium metal composite oxide,
- wherein the coating material contains an element A,
- the element A is one or more elements selected from the group consisting of Nb, Ta, Ti, Al, B, P, W, Zr, La, and Ge, and
- the following (1) and (2) are satisfied,
- (1) a surface presence rate of the coating material is 70% or more, and
- (2) 0.10<(Va0.9/SN)×(Vd0.5−Va0.5)/Va0.9<2.80,
- [SN is a BET specific surface area (unit:
- m2/g) of the cathode active material for solid lithium secondary battery, which is obtained by a measurement using a nitrogen adsorption method,
- Va0.5 is a water vapor adsorption amount (unit:
- cm3 (STP)/g) of the cathode active material for solid lithium secondary battery in a case where, in an adsorption isotherm obtained by a measurement using a water vapor adsorption method, a relative pressure p/po with a saturated vapor pressure p0 is 0.5,
- Va0.9 is a water vapor adsorption amount (unit:
- cm3 (STP)/g) of the cathode active material for solid lithium secondary battery in a case where, in the adsorption isotherm obtained by the measurement using the water vapor adsorption method, the relative pressure p/po is 0.9, and
- Vd0.5 is a water vapor adsorption amount (unit:
- cm3 (STP)/g) of the cathode active material for solid lithium secondary battery in a case where, in a desorption isotherm obtained by a measurement using a water vapor adsorption method, the relative pressure p/po is 0.5].
A method for manufacturing a cathode active material for solid lithium secondary battery, the method comprising:
- a coating step of coating at least a part of a surface of a lithium metal composite oxide using a coating device,
- wherein the coating device used in the coating step includes a treatment section in which the lithium metal composite oxide is flowable, and further includes a two-fluid nozzle which jets, toward the lithium metal composite oxide, a two-fluid jet containing a liquid coating raw material containing an element A and a carrier gas,
- the element A is one or more elements selected from the group consisting of Nb, Ta, Ti, Al, B, P, W, Zr, La, and Ge,
- the lithium metal composite oxide satisfies the following (A), and
- Qg, which is a flow rate (unit:
- g/min) of the carrier gas, and Ql, which is a flow rate (unit:
- g/min) of the coating raw material, satisfy the following (B),
- 0.1
- <
- Vl
- 0.9
- /
- L
- N
- <
- 6.8
- ,
- (
- A
- )
- (LN is a BET specific surface area (unit:
- m2/g) of the lithium metal composite oxide, which is measured by a nitrogen adsorption method, and
- Vl0.9 is a water vapor adsorption amount (unit:
- cm3 (STP)/g) of the lithium metal composite oxide in a case where, in an adsorption isotherm of a water vapor adsorption method, a relative pressure p/po with a saturated vapor pressure p0 is 0.9), and
- 0.6
- <
- Q
- g
- /
- Q
- l
- ≤
- 25.
- .
- (
- B
- )
Dependencies are inferred from the claim text.