Solid-state battery, halide solid electrolyte and electric device

Abstract

Provided are a solid-state battery, a halide solid electrolyte and an electric device. The solid-state battery comprises a positive electrode sheet, wherein the positive electrode sheet comprises a positive electrode active material layer, and the positive electrode active material layer comprises a positive electrode active material and a halide solid electrolyte; the positive electrode active material comprises a high-voltage material, and the maximum charging cut-off voltage of the high-voltage material is greater than or equal to 4.3 V; and the halide solid electrolyte comprises one or more compounds satisfying the chemical formula Li3-2a-bAaBbCcDdEeOnCl6-m-2nFm, where A comprises one or more of Ta, Nb and V, B comprises one or two of Zr and Hf, C, D and E each independently comprise a trivalent metal element, 0<a≤0.6, 0<b≤0.6, 0<c<0.3, 0<d<0.3, 0<e<0.3, c=d=e, 0≤n≤0.5, and the value of m enables the algebraic sum of the valences of the compounds to be 0.

Claims

1. A solid-state battery, comprising a positive electrode sheet, the positive electrode sheet includes a positive electrode active material layer, and the positive electrode active material layer contains a positive electrode active material and a halide solid electrolyte; The positive electrode active material includes a high-voltage material, and the highest charge cut-off voltage of the high-voltage material is greater than or equal to 4.3V; The halide solid electrolyte includes one or more of compounds satisfying the chemical formula Li 3-2a-b A a B b C c D d E e O n Cl 6-m-2n F m wherein, A includes one or more of Ta, Nb and V, B includes one or two of Zr and Hf, C, D, E each independently includes a trivalent metal element, 0 < a ≤ 0.6, 0 < b ≤ 0.6, 0 < c < 0.3, 0 < d < 0.3, 0 < e < 0.3, c = d = e, 0 ≤ n ≤ 0.5, and the value of m makes the algebraic sum of the valences of the compound zero.

2. The solid-state battery of claim 1, wherein, Meet one or more of the following conditions: (1) The highest charge cut-off voltage of the high-voltage material is 4.3V to 4.8V; (2) C, D, E each independently includes one or more of Sc, Y, La, Ce, Nd, Pm, Sm, Ho, Er, Yb, Al and In.

3. The solid-state battery of claim 1 or 2, wherein, 0<n≤0.5。 4. The solid-state battery according to any one of claims 1 to 3, wherein 0.1≤n≤0.5。 5. The solid-state battery according to any one of claims 1 to 4, wherein, The halide solid electrolyte includes one or more of a compound satisfying a chemical formula Li 3-2a-b A a Zr b In c D d E e O n Cl 6-m-2n F m ​ Among them, A is one or two of Ta or Nb, D, E each independently is one or more of Y, Er, Yb and Ho, 0.3 ≤ a ≤ 0.6, 0.2 ≤ b ≤ 0.6, 0 < c < 0.3, 0 < d < 0.3, 0 < e < 0.3, c = d = e, 0.25 ≤ n ≤ 0.5, and the value of m makes the algebraic sum of the valences of the compound zero.

6. The solid-state battery according to any one of claims 1 to 5, wherein, The positive electrode active material includes one or more of lithium nickel cobalt manganese oxide and lithium-rich manganese-based oxide, the lithium nickel cobalt manganese oxide satisfying the chemical formula LiNi x Co y Mn 1-x-y O2, 0.8 < x < 1, 0 < y < 0.1; the lithium-rich manganese-based oxide satisfying the chemical formula x'Li2MnO3·(1-x')LiMO2, M including a transition metal element, 0 < x' < 1.

7. The solid-state battery according to claim 6, wherein, Meet one or more of the following conditions: (1)0.83≤x≤0.98； (2)0.35≤x’≤0.75。 8. The solid-state battery according to claim 6 or 7, wherein, LiNi 0.83 Co 0.07 Mn 0.08 O2, LiNi 0.90 Co 0.05 Mn 0.05 O2, LiNi 0.94 Co 0.03 Mn 0.03 O2 and LiNi 0.96 Co 0.02 Mn 0.02 O2.

9. The solid-state battery according to any one of claims 6 to 8, wherein, The lithium-rich manganese-based oxide includes one or more of 0.45Li2MnO3·0.55LiNiO2, 0.55Li2MnO3·0.45LiNiO2, 0.55Li2MnO3·0.45LiCoO2 and 0.35Li2MnO3·0.75LiMnO2.

10. The solid-state battery according to any one of claims 1 to 9, wherein, The average particle size of the halide solid electrolyte is 0.3μm to 10μm.

11. The solid-state battery according to any one of claims 1 to 10, wherein, The average particle size of the halide solid electrolyte is 0.3μm to 2μm.

12. The solid-state battery according to any one of claims 1 to 11, wherein, The mass ratio of the positive electrode active material to the halide solid electrolyte is (60 - 80):(37 - 17).

13. The solid-state battery according to any one of claims 1 to 12, wherein, The positive electrode active material layer further contains a conductive agent, and the mass ratio of the conductive agent to the positive electrode active material is 3:(60 - 80).

14. The solid-state battery according to any one of claims 1 to 13, wherein, The solid-state battery further includes a solid electrolyte layer, and the solid electrolyte layer contains a sulfide solid electrolyte.

15. The solid-state battery according to any one of claims 1 to 14, wherein, The solid-state battery is a all-solid-state battery.

16. A halide solid electrolyte comprising one or more of the compounds satisfying the chemical formula Li 3-2a-b A a B b C c D d E e O n Cl 6-m-2n F m . in, A includes one or more of Ta, Nb and V, B includes one or two of Zr and Hf, C, D, E each independently is a trivalent metal element, 0 < a ≤ 0.6, 0 < b ≤ 0.6, 0 < c < 0.3, 0 < d < 0.3, 0 < e < 0.3, c = d = e, 0 ≤ n ≤ 0.5, and the value of m makes the algebraic sum of the valences of the compound zero.

17. The halide solid electrolyte according to claim 16, wherein, The halide solid electrolyte is the halide solid electrolyte in the solid-state battery according to any one of claims ​

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