Positive electrode active material for sulfide-based all-solid-state battery
AssigneeLG Energy Solution, Ltd.
InventorsDae Jin Lee, Ji Young Kim, Hoe Jin Hah, Lak Young Choi
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Abstract
A positive electrode active material and an all-solid-state battery comprising the same are provided. The positive electrode active material comprises a shell containing metal sulfide particles having a specific range of particle size adsorbed on a surface of a core containing a lithium metal oxide, and reduces cracks generated between the positive electrode active material and a solid electrolyte and reactivity therebetween and thereby providing improved mobility of lithium ions and high charge-discharge capacity.
Claims12
A positive electrode active material for an all-solid-state battery, the positive electrode active material including:
- a core containing a lithium metal oxide represented by the following Chemical Formula 1;
- and
- a shell adsorbed on a surface of the core and including metal sulfide particles having an average particle size of 0.1 nm to 40 nm:
- wherein;
- M1 is one or more elements selected from the group consisting of W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, and
- wherein 1.0≤x≤1.30, 0.1≤y<0.95, 0.01<z≤0.5, 0.01<w≤0.5, 0≤v≤0.2, and 1.5≤u≤4.5, respectively.
A method of preparing a positive electrode active material for an all-solid-state battery, the method including:
- preparing a mixture including a lithium metal oxide represented by the following Chemical Formula 1 and metal sulfide particles;
- and
- heat-treating the mixture;
- wherein the metal sulfide particles have an average particle size of 0.1 nm to 40 nm,
- wherein;
- M1 is one or more elements selected from the group consisting of W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, and
- wherein 1.0≤x≤1.30, 0.1≤y<0.95, 0.01<z≤0.5, 0.01<w≤0.5, 0≤v≤0.2, and 1.5≤u≤4.5, respectively.
Dependencies are inferred from the claim text.