Metal negative electrode, method for fabricating the same and secondary battery including the same

Patent metadata

Field	Value
Publication number	US-2022320488-A1
Application number	US-202017753694-A
Country	US
Kind code	A1
Filing date	Sep 11, 2020
Priority date	Sep 12, 2019
Publication date	Oct 6, 2022
Grant date	—

Abstract

Provided is a metal negative electrode that has an excellent repeat resistance and is excellent in charge and discharge cycle characteristics even in a high charge and discharge rate, a method for fabricating the same, and a secondary battery using the metal negative electrode. The metal negative electrode is a metal negative electrode used for a secondary battery, which includes an active material portion, a current collector, and a non-electronically conductive reaction space divider. The active material portion forms metal during charging and forms an oxidation product of the metal during discharging. The metal is used as a negative-electrode active material. The current collector is electrically connected to the active material portion. The non-electronically conductive reaction space divider is integrally formed with or connected to the current collector and/or the active material portion. The reaction space divider has a plurality of electrolyte holder portions configured to hold a liquid electrolyte.

First claim

1 - 16 . (canceled)

17 . A metal negative electrode used for a secondary battery, comprising:
an active material portion that forms metal during charging and forms an oxidation product of the metal during discharging, the metal being used as a negative-electrode active material, a current collector electrically connected to the active material portion, and a non-electronically conductive reaction space divider integrally formed with the active material portion, wherein the reaction space divider is a plate-like member having a plurality of through-holes, one side of each through-hole being opened, and the opposite side of each through-hole being occluded by the active material portion, a space divided by an inner wall of each through-hole and a part of the active material portion that occludes the through-hole forms an electrolyte holder portion consisting of a space configured to hold a liquid electrolyte, and the active material portion is exposed within each through-hole.

18 . The metal negative electrode according to claim 17 ,
wherein the metal is selected from the group consisting of zinc, lithium, magnesium, sodium, potassium, calcium and any of alloys containing the metals as components.

19 . The metal negative electrode according to claim 17 ,
wherein each of the electrolyte holder portions has a circular cross-sectional shape.

20 . The metal negative electrode according to claim 17 ,
wherein each of the electrolyte holder portions has a polygonal cross-sectional shape.

21 . The metal negative electrode according to claim 17 ,
wherein the reaction space divider has a connection passage that connects the electrolyte holder portions to one another.

22 . The metal negative electrode according to claim 17 ,
wherein the reaction space divider has an opening passage that connects the electrolyte holder portion to a side surface of the reaction space divider, with surfaces on which through-holes are provided as upper and lower surfaces.

23 . The metal negative electrode according to claim 17 ,
wherein the reaction space divider consists of a plastics material.

24 . The metal negative electrode according to claim 17 ,
wherein at least one of the electrolyte holder portions has a different maximum span length from maximum span lengths of the other electrolyte holder portions.

25 . The metal negative electrode according to claim 17 ,
wherein the electrolyte holder portion has a maximum span length of less than 20 mm.

26 . The metal negative electrode according to claim 17 ,
wherein the electrolyte holder portion has a maximum span length of 5 mm or less.

27 . A method for fabricating the metal negative electrode according to claim 17 , comprising:
a step of directly connecting the reaction space divider onto the current collector, and a step of filling each through-hole with the active material portion to integrally form the reaction space divider and the active material portion, and electrically connecting the active material portion to the current collector.

28 . A method for fabricating the metal negative electrode according to claim 17 , comprising
a step of electrically connecting the current collector to the active material portion, and a step of integrally forming the active material portion and the reaction space divider to expose the active material portion within the through-hole.

29 . The method for fabricating the metal negative electrode according to claim 27 , comprising
an oxidation step of converting a part of or the whole of the metal of the metal negative electrode into the oxidation product of the metal.

30 . The method for fabricating the metal negative electrode according to claim 27 ,
wherein the metal is zinc, and the oxidation product of the metal is zinc oxide.

31 . A secondary battery comprising the metal negative electrode according to claim 17 .

32 . The secondary battery according to claim 31 , comprising a positive electrode and a liquid electrolyte,
wherein the side on which each through-hole is opened of the metal negative electrode is occluded by the positive electrode, and the electrolyte holder portion holds the liquid electrolyte between the positive electrode and the active material portion.

33 . The secondary battery according to claim 31 , being any one of a zinc-air secondary battery, a zinc-nickel secondary battery, a zinc-silver secondary battery, a lithium-air secondary battery, a lithium-sulfur secondary battery, a magnesium-air secondary battery, a sodium-sulfur secondary battery, a potassium secondary battery, a calcium secondary battery, and a multivalent-ion secondary battery.

Assignees

• The Doshisha
• Dowa Holdings Co Ltd

Inventors

• Morimitsu Masatsugu

Classifications

• H01M4/70

  characterised by shape or form · CPC title

• H01M4/46

  Alloys based on magnesium or aluminium · CPC title

• H01M12/06

  with one metallic and one gaseous electrode · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title