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EP-4738510-A1 - ALL-SOLID-STATE BATTERY AND APPLICATION THEREOF

EP4738510A1EP 4738510 A1EP4738510 A1EP 4738510A1EP-4738510-A1

Abstract

Provided are an all-solid-state battery (10) and application thereof, and the all-solid-state battery (10) at least includes: at least two first solid electrolyte layers (131), respectively disposed on a positive electrode (11) side and a negative electrode (12) side of the all-solid-state battery (10), an ionic conductivity of a first solid electrolyte layer (131) is 1×10 -3 S/cm to 1×10 -2 S/cm; and a second solid electrolyte layer (132), disposed between the two first solid electrolyte layers (131), an ionic conductivity of the second solid electrolyte layer (132) is 1×10 -3 S/cm to 2×10 -2 S/cm. Through the all-solid-state battery and application thereof provided by the disclosure, the lithium dendrite penetration resistance performance of the solid electrolyte membrane in the all-solid-state battery may be improved, the interfacial stability between the solid electrolyte membrane and the negative electrode may be improved, thereby enhancing the cycle performance and safety of the battery.

Inventors

  • YU, LE
  • WU, MING

Assignees

  • AESC Japan Ltd.

Dates

Publication Date
20260506
Application Date
20250926

Claims (10)

  1. An all-solid-state battery (10), comprising: at least two first solid electrolyte layers (131) respectively disposed on a positive electrode (11) side and a negative electrode (12) side of the all-solid-state battery (10), wherein an ionic conductivity of a first solid electrolyte layer (131) is 1×10 -3 S/cm to 1×10 -2 S/cm; and a second solid electrolyte layer (132) disposed between the two first solid electrolyte layers (131), wherein an ionic conductivity of the second solid electrolyte layer (132) is 1×10 -3 S/cm to 2×10 -2 S/cm.
  2. The all-solid-state battery (10) according to claim 1, wherein the first solid electrolyte layer (131) comprises a first electrolyte, wherein a chemical formula of the first electrolyte is Li a P 1-b M b S c O d X e , 5<a<6, 0<b<1, 1.5<c<5, 0<d<2.5, 4<c+d<5, 1<e<2, M is selected from at least one of Al, Ga, In, Ti, Sc, As, Sb, Bi, As, V, or Nb, and X is selected from at least one of Cl, Br, or I.
  3. The all-solid-state battery (10) according to claim 2, wherein M is selected from at least one of Sb, In, or Bi, X is Cl, and a range of b is 0<b<0.1.
  4. The all-solid-state battery (10) according to claim 1, wherein the first solid electrolyte layer (131) comprises a first electrolyte, a chemical formula of the first electrolyte is Li f P 1-g E g S w O g Q z , 5<f<10, 0<g<1, 3<w<6, 4<w+g<6, 0<z<2, E is selected from at least one of Mg, Ca, Sr, Ba, Zn, Cr, Sn, or Pb, and Q is selected from at least one of Cl, Br, or I.
  5. The all-solid-state battery (10) according to claim 4, wherein E is Mg, Q is Cl, and a range of g is 0.01≤g≤0.1.
  6. The all-solid-state battery (10) according to any one of claims 2 to 5, wherein the second solid electrolyte layer (132) comprises the first electrolyte and a second electrolyte, a chemical formula of the second electrolyte is Li 10 Ge 1-i G i P 2 S 12 , 0≤i<1, and G is selected from at least one of Si or Sn.
  7. The all-solid-state battery (10) according to claim 6, wherein in the second solid electrolyte layer (132), a content of the first electrolyte is 1wt% to 95wt%, and a content of the second electrolyte is 5wt% to 99wt%.
  8. The all-solid-state battery (10) according to claim 1, wherein a thickness of the first solid electrolyte layer (131) is 1µm to 120µm.
  9. The all-solid-state battery (10) according to claim 1, wherein a thickness of the second solid electrolyte layer (132) is 1µm to 100µm.
  10. An electronic device, comprising the all-solid-state battery (10) according to any one of claims 1 to 9.

Description

BACKGROUND Technical Field The disclosure relates to the field of battery technology, particularly relates to an all-solid-state battery and application thereof. Related Art All-solid-state batteries have received widespread attention due to the adoption of solid electrolyte membranes with high energy density, good safety, and strong durability. In solid electrolyte membranes, sulfide solid electrolytes have been widely applied due to the significant room temperature ionic conductivity and processability thereof. However, in practical applications, sulfide solid electrolytes have problems such as poor lithium dendrite penetration resistance performance and poor interfacial stability with lithium metal negative electrodes, which significantly restrict the development of all-solid-state batteries. SUMMARY The disclosure provides an all-solid-state battery and application thereof, through the all-solid-state battery and application thereof provided by the disclosure, the lithium dendrite penetration resistance performance of the solid electrolyte membrane in the all-solid-state battery may be improved, the interfacial stability between the solid electrolyte membrane and the negative electrode may be improved, thereby enhancing the cycle performance and safety of the battery. To solve the above technical problems, the disclosure provides an all-solid-state battery, at least including: at least two first solid electrolyte layers are provided, respectively disposed on a positive electrode side and a negative electrode side of the all-solid-state battery, in which an ionic conductivity of a first solid electrolyte layer is 1×10-3S/cm to 1×10-2S/cm, anda second solid electrolyte layer is provided, disposed between the two first solid electrolyte layers, in which an ionic conductivity of the second solid electrolyte layer is 1×10-3S/cm to 2×10-2S/cm. In one example of the disclosure, the first solid electrolyte layer includes a first electrolyte, in which a chemical formula of the first electrolyte is LiaP1-bMbScOdXe, 5<a<6, 0<b<1, 1.5<c<5, 0<d<2.5, 4<c+d<5, 1<e<2, M is selected from at least one of Al, Ga, In, Ti, Sc, As, Sb, Bi, As, V, or Nb, and X is selected from at least one of Cl, Br, or I. In one example of the disclosure, M is selected from at least one of Sb, In, or Bi, X is Cl, and a range of b is 0<b<0.1. In one example of the disclosure, the first solid electrolyte layer includes a first electrolyte, a chemical formula of the first electrolyte is LifP1-gEgSwOgQz, 5<f<10, 0<g<1, 3<w<6, 4<w+g<6, 0<z<2, E is selected from at least one of Mg, Ca, Sr, Ba, Zn, Cr, Sn, or Pb, and Q is selected from at least one of Cl, Br, or I. In one example of the disclosure, E is Mg, Q is Cl, and a range of g is 0.01<g<0.1. In one example of the disclosure, the second solid electrolyte layer includes the first electrolyte and a second electrolyte, a chemical formula of the second electrolyte is Li10Ge1-iGiP2S12, 0≤i<1, and G is selected from at least one of Si or Sn. In one example of the disclosure, in the second solid electrolyte layer, a content of the first electrolyte is 1wt% to 95wt%, and a content of the second electrolyte is 5wt% to 99wt%. In one example of the disclosure, a thickness of the first solid electrolyte layer is 1µm to 120µm. In one example of the disclosure, a thickness of the second solid electrolyte layer is 1µm to 100µm. The disclosure further provides an electronic device, which includes the all-solid-state battery. In summary, the disclosure provides an all-solid-state battery and application thereof, through improving the solid electrolyte membrane in the all-solid-state battery, the interfacial stability between the solid electrolyte membrane and the negative electrode may be improved, thereby reducing interfacial impedance and improving charge transfer efficiency. The lithium dendrite penetration resistance performance of the solid electrolyte membrane may be improved, avoiding battery short circuit and ensuring that the battery can operate stably and safely under high rate. The ionic conductivity of the solid electrolyte membrane may be improved, thereby improving the working efficiency of the battery. Moreover, the cycle performance of the battery may be improved and the service life of the battery may be extended. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions of the examples of the disclosure, the drawings required for describing the examples will be briefly introduced below. Certainly, the drawings described below are merely some examples of the disclosure. For persons of ordinary skill in the art, other drawings may also be obtained according to these drawings without creative work. FIG.1 is a structural diagram of an all-solid-state battery in one example of the disclosure. FIG.2 is a process schematic diagram of preparing a first solid electrolyte layer and a second solid electrolyte layer in one example of the disclosure.FIG.3 is a scanning