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EP-4738509-A1 - ALL-SOLID-STATE BATTERY AND APPLICATION THEREOF

EP4738509A1EP 4738509 A1EP4738509 A1EP 4738509A1EP-4738509-A1

Abstract

An all-solid-state battery (10) and an application thereof are provided. The all-solid-state battery (10) includes at least: a first solid electrolyte layer (131) disposed on a side of a positive electrode (11) of the all-solid-state battery (10), with an ionic conductivity of 1×10 -4 ~1×10 -2 S/cm; a second solid electrolyte layer (132) disposed on a side of a negative electrode (12) of the all-solid-state battery (10), with an ionic conductivity of 1×10 -3 ~2×10 -2 S/cm; and a third solid electrolyte layer (133) disposed between the first solid electrolyte layer (131) and the second solid electrolyte layer (132), with an ionic conductivity of 1×10 -3 ~2×10 -2 S/cm. The disclosure may improve resistance of a solid electrolyte membrane to lithium dendrite penetration in the all-solid-state battery, improve the ionic conductivity, electrochemical reduction stability, and compatibility between the solid electrolyte membrane and the positive and negative electrodes, thereby improving cycle life and safety of a battery.

Inventors

  • YU, LE
  • WU, MING

Assignees

  • AESC Japan Ltd.

Dates

Publication Date
20260506
Application Date
20250922

Claims (11)

  1. An all-solid-state battery (10), comprising at least: a first solid electrolyte layer (131) disposed on a side of a positive electrode (11) of the all-solid-state battery (10), wherein an ionic conductivity of the first solid electrolyte layer (131) is 1×10 -4 S/cm~1×10 -2 S/cm; a second solid electrolyte layer (132) disposed on a side of a negative electrode (12) of the all-solid-state battery (10), wherein an ionic conductivity of the second solid electrolyte layer (132) is 1×10 -3 S/cm~2×10 -2 S/cm; and a third solid electrolyte layer (133) disposed between the first solid electrolyte layer (131) and the second solid electrolyte layer (132), wherein an ionic conductivity of the third solid electrolyte layer (133) is 1×10 -3 S/cm~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, and a chemical formula of the first electrolyte is Li 2+n Zr 1-n M n Cl 6-x-y Br x I y , wherein 0≤n≤0.6, 0≤x≤6, 0≤y≤6, x+y≤6, and M is selected from at least one of V, Cr, Mn, Fe, Co, or Ni.
  3. The all-solid-state battery (10) according to claim 2, wherein M is Fe, and a value range of n is 0.01≤n≤0.5.
  4. The all-solid-state battery (10) according to claim 1, wherein the second solid electrolyte layer (132) comprises a second electrolyte, and a chemical formula of the second electrolyte is Li a P 1-b T b S c O d X e , wherein 5<a<6, 0<b<1, 1.5<c<5, 0<d<2.5, 4<c+d<5, 1<e<2, T is selected from at least one of Al, Ga, In, Ti, Sc, As, Sb, Bi, V, or Nb, and X is selected from at least one of Cl, Br, or I.
  5. The all-solid-state battery (10) according to claim 4, wherein T is selected from at least one of Sb, In, or Bi, X is Cl, and a value range of b is 0<b≤0.1.
  6. The all-solid-state battery (10) according to claim 1, wherein the second solid electrolyte layer (132) comprises a second electrolyte, and a chemical formula of the second electrolyte is Li f P 1-g E g S w O g Q z , wherein 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.
  7. The all-solid-state battery (10) according to claim 6, wherein E is Mg, Q is Cl, and a value range of g is 0.01≤g≤0.1.
  8. The all-solid-state battery (10) according to any one of claims 4 to 7, wherein the third solid electrolyte layer (133) comprises the second electrolyte and a third electrolyte, and a chemical formula of the third electrolyte is Li 10 Ge 1-i G i P 2 S 12 , wherein, 0≤i < 1, and G is selected from at least one of Si or Sn.
  9. The all-solid-state battery (10) according to claim 8, wherein in the third solid electrolyte layer (133), a content of the second electrolyte is 1 wt% to 95 wt%, and a content of the third electrolyte is 5 wt% to 99 wt%.
  10. The all-solid-state battery (10) according to claim 1, wherein a thickness of the first solid electrolyte layer (131) is 1 µm to 100 µm, a thickness of the second solid electrolyte layer (132) is 1 µm to 150 µm, and a thickness of the third solid electrolyte layer (133) is 1 µm to 100 µm.
  11. An electronic device, comprising the all-solid-state battery (10) according to any one of claims 1 to 10.

Description

BACKGROUND Technical Field The disclosure relates to a technical field of a battery, and more particularly, to an all-solid-state battery and an application thereof. Description of Related Art With rapid development of industries such as new energy vehicles and wearable devices, a demand for a lithium-ion battery with high energy density, long cycle life, and high safety is increasing. An all-solid-state battery has attracted widespread attention due to advantages thereof such as excellent ion conductivity, mechanical strength, and thermal stability. However, in an actual application of the all-solid-state battery, a solid electrolyte membrane may not meet characteristics such as high ionic conductivity, resistance to lithium dendrite penetration, high voltage resistance, and reduction resistance at the same time, thereby seriously restricting the development and application of the all-solid-state battery. SUMMARY The disclosure provides an all-solid-state battery and an application thereof. Through the all-solid-state battery and the application thereof provided in the disclosure, the resistance of the solid electrolyte membrane to lithium dendrite penetration in the all-solid-state battery may be improved, and an ionic conductivity, electrochemical reduction stability, and compatibility between the solid electrolyte membrane and the positive and negative electrodes may be improved, thereby improving cycle life and safety of a battery. In order to solve the above technical issues, the disclosure provides an all-solid-state battery, including at least: a first solid electrolyte layer disposed on a side of a positive electrode of the all-solid-state battery, in which an ionic conductivity of the first solid electrolyte layer is 1×10-4S/cm~1×10-2S/cm;a second solid electrolyte layer disposed on a side of a negative electrode of the all-solid-state battery, in which an ionic conductivity of the second solid electrolyte layer is 1×10-3S/cm~2×10-2S/cm; anda third solid electrolyte layer disposed between the first solid electrolyte layer and the second solid electrolyte layer, in which an ionic conductivity of the third solid electrolyte layer is 1×10-3S/cm~2×10-2S/cm. In an embodiment of the disclosure, the first solid electrolyte layer includes a first electrolyte, and a chemical formula of the first electrolyte is Li2+nZf1-nMnCl6-x-yBrxIy, where 0≤n≤0.6, 0≤x≤6, 0≤y≤6, x+y≤6, and M is selected from at least one of V, Cr, Mn, Fe, Co, or Ni. In an embodiment of the disclosure, M is Fe, and a value range of n is 0.01≤n≤0.5. In an embodiment of the disclosure, the second solid electrolyte layer includes a second electrolyte, and a chemical formula of the second electrolyte is LiaP1-bTbScOdXe, where 5<a<6, 0<b<1, 1.5<c<5, 0<d<2.5, 4<c+d<5, 1<e<2, T is selected from at least one of Al, Ga, In, Ti, Sc, As, Sb, Bi, V, or Nb, and X is selected from at least one of Cl, Br, or I. In an embodiment of the disclosure, T is selected from at least one of Sb, In, or Bi, X is Cl, and a value range of b is 0<b≤0.1. In an embodiment of the disclosure, the second solid electrolyte layer includes a second electrolyte, and a chemical formula of the second electrolyte is LifP1-gEgSwOgQz, where 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 an embodiment of the disclosure, E is Mg, Q is Cl, and a value range of g is 0.01≤g≤0.1. In an embodiment of the disclosure, the third solid electrolyte layer includes the second electrolyte and a third electrolyte, and a chemical formula of the third electrolyte is Li10Ge1-iGiP2S12, where, 0≤i < 1, and G is selected from at least one of Si or Sn. In an embodiment of the disclosure, in the third solid electrolyte layer, a content of the second electrolyte is 1 wt% to 95 wt%, and a content of the third electrolyte is 5 wt% to 99 wt%. In an embodiment of the disclosure, a thickness of the first solid electrolyte layer is 1 µm to 100 µm, a thickness of the second solid electrolyte layer is 1 µm to 150 µm, and a thickness of the third solid electrolyte layer is 1 µm to 100 µm. The disclosure further provides an electronic device, including the all-solid-state battery. Based on the above, the disclosure provides the all-solid-state battery and the application thereof. By improving the solid electrolyte membrane in the all-solid-state battery, the compatibility between the solid electrolyte membrane and the positive and negative electrodes may be improved, and an electrochemical window of the solid electrolyte membrane may be widened, thereby improving stability of the all-solid-state battery. It may improve the resistance of the solid electrolyte membrane to lithium dendrite penetration, avoid the short circuit of the battery, and ensure that the all-solid-state battery may still operate stably and safely at the high rate, thereby improving the safety and cycle life of the battery. It may