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CN-122029618-A - Sulfide solid electrolyte, method for producing sulfide solid electrolyte, positive electrode for electric storage element, and electric storage element

CN122029618ACN 122029618 ACN122029618 ACN 122029618ACN-122029618-A

Abstract

One aspect of the present invention has a crystal structure, and contains at least one element a selected from the group consisting of lithium element, sodium element and potassium element, phosphorus element, at least one element M selected from the group consisting of aluminum element and boron element, nitrogen element, and at least one halogen element, wherein a molar ratio (a/P) of a content of the element a to a content of the phosphorus element is less than 3.74, and a molar ratio (N/P) of a content of the nitrogen element to a content of the phosphorus element is less than 0.33.

Inventors

  • Fukuba Akihiro
  • UMEDA Tomohito
  • Keyamoto mototsugu
  • INUI TAKAAKI
  • YOSHIKAWA DAISUKE

Assignees

  • 株式会社杰士汤浅国际

Dates

Publication Date
20260512
Application Date
20241017
Priority Date
20231017

Claims (9)

  1. 1. A sulfide solid electrolyte having a crystal structure and containing at least one element A selected from the group consisting of a lithium element, a sodium element and a potassium element, a phosphorus element, at least one element M selected from the group consisting of an aluminum element and a boron element, a nitrogen element, and at least one halogen element, The molar ratio of the content of the element A to the content of the phosphorus element, namely A/P, is less than 3.74, The molar ratio of the content of the nitrogen element to the content of the phosphorus element, i.e., N/P, is less than 0.33.
  2. 2. The sulfide solid electrolyte according to claim 1, wherein the element M contains an aluminum element.
  3. 3. The sulfide solid electrolyte according to claim 1 or 2, wherein the halogen element contains a bromine element or an iodine element.
  4. 4. The sulfide solid electrolyte according to claim 1 or 2, which is represented by the following formula (1), A a PM b S c N d X e Y f ···(1) In the above formula (1), A is at least one selected from the group consisting of Li, na and K, M is at least one selected from the group consisting of Al and B, X is at least one selected from the group consisting of F, cl, br and I, Y is at least one element other than A, P, S, M, N and X, a, B, c, d, e and F satisfy 2≤a <3.74, 0.01≤b≤1, 2≤c≤6, 0.01≤d <0.33, 0.01≤e≤1 and 0≤f≤1, respectively.
  5. 5. A method for producing a sulfide solid electrolyte, comprising the step of treating a composition, The composition contains at least one element A selected from the group consisting of lithium element, sodium element and potassium element, phosphorus element, at least one element M selected from the group consisting of aluminum element and boron element, nitrogen element, and at least one halogen element, wherein the molar ratio of the content of the element A to the content of the phosphorus element, namely A/P, is less than 3.74, and the molar ratio of the content of the nitrogen element to the content of the phosphorus element, namely N/P, is less than 0.33.
  6. 6. The method for producing a sulfide solid electrolyte according to claim 5, wherein, The composition comprises a compound represented by a α M β N, wherein a is the element a, M is the element M, and α and β are values giving a stoichiometric ratio according to the kind of the element M.
  7. 7. A sulfide solid electrolyte produced by the production method of a sulfide solid electrolyte according to claim 5 or 6.
  8. 8. A positive electrode for an electric storage element, comprising the sulfide solid electrolyte according to claim 1 or 2.
  9. 9. An electric storage element comprising the sulfide solid electrolyte according to claim 1 or 2.

Description

Sulfide solid electrolyte, method for producing sulfide solid electrolyte, positive electrode for electric storage element, and electric storage element Technical Field The present invention relates to a sulfide solid electrolyte, a method for producing sulfide solid electrolyte, a positive electrode for an electric storage element, and an electric storage element. Background Lithium ion secondary batteries are often used in electronic devices such as personal computers and communication terminals, automobiles, and the like because of their high energy density. The lithium ion secondary battery is generally configured to have a pair of electrodes electrically isolated from each other by a separator and a nonaqueous electrolyte interposed between the electrodes, and to perform charge and discharge by passing lithium ions between the electrodes. In addition, capacitors such as lithium ion capacitors have been widely used as storage elements other than lithium ion secondary batteries. In recent years, as a power storage element using a solid electrolyte such as a sulfide solid electrolyte instead of a nonaqueous electrolyte obtained by dissolving an electrolyte salt in a liquid such as an organic solvent, a nonaqueous electrolyte has been proposed. Patent document 1 describes a sulfide solid electrolyte having a crystal structure, which contains one or two or more kinds of 2-valent elements a, one or two or more kinds of halogen elements X, and nitrogen elements as constituent elements, wherein the 2-valent elements a and the halogen elements X are a combination of compounds a 0.5 X composed of these elements having a higher hydration energy than LiI. Prior art literature Patent literature Patent document 1 International publication No. 2020/045634 Disclosure of Invention Problems to be solved by the invention Patent document 1 describes that a hydration reaction having low reversibility can be suppressed by containing nitrogen element in a sulfide solid electrolyte. However, the inventors have found that the oxidation resistance may be lowered due to the nitrogen element contained in the sulfide solid electrolyte. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sulfide solid electrolyte having high oxidation resistance, a method for producing the sulfide solid electrolyte, and a positive electrode for a power storage element and a power storage element each using the sulfide solid electrolyte. Means for solving the problems The sulfide solid electrolyte according to one aspect of the present invention has a crystal structure, and contains at least one element a selected from the group consisting of a lithium element, a sodium element, and a potassium element, a phosphorus element, at least one element M selected from the group consisting of an aluminum element and a boron element, a nitrogen element, and at least one halogen element, wherein a molar ratio (a/P) of a content of the element a to a content of the phosphorus element is less than 3.74, and a molar ratio (N/P) of a content of the nitrogen element to a content of the phosphorus element is less than 0.33. The method for producing a sulfide solid electrolyte according to another aspect of the present invention includes a step of treating a composition containing at least one element a selected from the group consisting of a lithium element, a sodium element and a potassium element, a phosphorus element, at least one element M selected from the group consisting of an aluminum element and a boron element, a nitrogen element, and at least one halogen element, wherein a molar ratio (a/P) of a content of the element a to a content of the phosphorus element is less than 3.74, and a molar ratio (N/P) of a content of the nitrogen element to a content of the phosphorus element is less than 0.33. The sulfide solid electrolyte according to another aspect of the present invention is produced by the method for producing a sulfide solid electrolyte according to another aspect of the present invention. The positive electrode for a power storage element according to another aspect of the present invention contains the sulfide solid electrolyte according to one aspect of the present invention. The electric storage element according to another aspect of the present invention contains the sulfide solid electrolyte according to one aspect of the present invention. Effects of the invention According to any of the aspects of the present invention, it is possible to provide a sulfide solid electrolyte having high oxidation resistance, a method for producing such sulfide solid electrolyte, and a positive electrode for a power storage element and a power storage element each using such sulfide solid electrolyte. Drawings Fig. 1 is a schematic cross-sectional view of an all-solid-state battery as one embodiment of an electric storage element of the present invention. Fig. 2 is a schematic diagram sh