Anode and secondary battery with anode material with pore group with low volumetric capacity

Patent metadata

Field	Value
Publication number	US-2016072126-A1
Application number	US-201514943258-A
Country	US
Kind code	A1
Filing date	Nov 17, 2015
Priority date	Jun 5, 2007
Publication date	Mar 10, 2016
Grant date	—

Abstract

A battery capable of improving cycle characteristics is provided. An anode includes: an anode current collector, and an anode active material layer arranged on the anode current collector, in which the anode active material layer includes an anode active material including silicon (Si), and including a pore group with a diameter ranging from 3 nm to 50 nm both inclusive, and the volumetric capacity per unit weight of silicon of the pore group with a diameter ranging from 3 nm to 50 nm both inclusive is 0.2 cm 3 /g or less, the volumetric capacity being measured by mercury porosimetry using a mercury porosimeter.

First claim

What is claimed is:

1 . A secondary battery comprising a cathode, an anode and an electrolytic solution, wherein:
the anode includes an anode current collector, and an anode active material layer on the anode current collector; the anode active material layer includes (a) silicon and (b) a pore group whose pores have diameters ranging from 3 nm to 50 nm; and a volumetric capacity of the pore group whose pores have diameters ranging from 3 nm to 50 nm in the anode active material layer per unit weight of silicon is 0.2 cm 3 /g or less as measured by mercury porosimetry using a mercury porosimeter.

2 . The secondary battery according to claim 1 , wherein the volumetric capacity of the pore group whose pores have diameters ranging from 3 nm to 50 nm in the anode active material layer per unit weight of silicon of the pore group is 0.05 cm 3 /g or less.

3 . The secondary battery according to claim 1 , wherein the volumetric capacity of the pore group whose pores have diameters ranging from 3 nm to 50 nm in the anode active material layer per unit weight of silicon of the pore group is 0 cm 3 /g.

4 . The secondary battery according to claim 1 , wherein:
the anode active material layer includes a pore group whose pores have diameters ranging from 3 nm to 20 nm; and the volumetric capacity of the pore group whose pores have diameters ranging from 3 nm to 20 nm in the anode active material layer per unit weight of silicon of the pore group is 0.2 cm 3 /g or less.

5 . The secondary battery according to claim 4 , wherein the volumetric capacity of the pore group whose pores have diameters ranging from 3 nm to 20 nm in the anode active material layer per unit weight of silicon of the pore group is 0.05 cm 3 /g or less.

6 . The secondary battery according to claim 4 , wherein the volumetric capacity of the pore group whose pores have diameters ranging from 3 nm to 20 nm in the anode active material layer per unit weight of silicon of the pore group e is 0 cm 3 /g.

7 . The secondary battery according to claim 1 , wherein the anode active material layer includes an oxide-containing film in at least some of the pores of the pore group.

8 . The secondary battery according to claim 7 , wherein the oxide-containing film includes at least one kind of oxide selected from the group consisting of an oxide of silicon, an oxide of germanium, and an oxide of tin.

9 . The secondary battery according to claim 7 , wherein the oxide-containing film is formed by a liquid-phase deposition method, a sol-gel method, a coating method or a dip coating method.

10 . The secondary battery according to claim 1 , wherein the anode active material layer includes in at least some of the pores of the pore group a metal material which is not alloyed with an electrode reactant.

11 . The secondary battery according to claim 10 , wherein the metal material includes at least one kind selected from the group consisting of iron, cobalt, nickel, zinc, and copper.

12 . The secondary battery according to claim 10 , wherein the metal material is formed by an electrolytic plating method or an electroless plating method.

13 . The secondary battery according to claim 1 , wherein the anode active material layer is in the form of a plurality of particles.

14 . The secondary battery according to claim 13 , wherein the anode active material layer particles have a multilayer configuration.

15 . The secondary battery according to claim 1 , wherein the anode active material layer is formed by a vapor-phase method.

16 . The secondary battery according to claim 1 , wherein the anode active material layer includes oxygen, and the oxygen content in the anode active material layer is within a range from 3 at % to 40 at %.

17 . The secondary battery according to claim 1 , wherein the anode active material layer includes at least one kind of metal element selected from the group consisting of iron, cobalt, nickel, chromium, titanium, and molybdenum.

18 . The secondary battery according to claim 1 , wherein the anode active material layer includes an oxygen-containing region extending in a thickness direction of the anode active material layer, and the oxygen content in the oxygen-containing region is higher than the oxygen content in a region other than the oxygen-containing region.

19 . The secondary battery according to claim 1 , wherein a ten-point height of a roughness profile Rz of the surface of the anode current collector is within a range from and including 1.5 μm to 6.5 μm.

20 . The secondary battery according to claim 1 , wherein the electrolytic solution includes a solvent including a sultone.

21 . The secondary battery according to claim 20 , wherein the sultone is 1,3-propene sultone.

22 . The secondary battery according to claim 1 , wherein the electrolytic solution includes a solvent including a cyclic carbonate including an unsaturated bond.

23 . The secondary battery according to claim 22 , wherein the cyclic carbonate including an unsaturated bond is vinylene carbonate or vinyl ethylene carbonate.

24 . The secondary battery according to claim 1 , wherein the electrolytic solution includes a solvent including a fluorinated carbonate.

25 . The secondary battery according to claim 24 , wherein the fluorinated carbonate is difluoroethylene carbonate.

26 . The secondary battery according to claim 1 , wherein the electrolytic solution includes an electrolyte salt including boron and fluorine.

27 . The secondary battery according to claim 26 , wherein the electrolyte salt is lithium tetrafluoroborate.

28 . The secondary battery according to claim 1 , wherein the cathode, the anode and the electrolytic solution are contained in a cylindrical or prismatic package member.

29 . The secondary battery according to claim 28 , wherein the package member includes iron or an iron alloy.

30 . The secondary battery according to claim 1 wherein the anode active material layer has a multilayer configuration.

31 . An anode comprising an anode current collector, and an anode active material layer on the anode current collector, wherein:
the anode active material layer includes (a) silicon and (b) a pore group whose pores have diameters ranging from 3 nm to 50 nm; and a volumetric capacity of the pore group whose pores have diameters ranging from 3 nm to 50 nm in the anode active material layer per unit weight of silicon is 0.2 cm 3 /g or less as measured by mercury porosimetry using a mercury porosimeter.

Assignees

• Sony Corp

Inventors

• Hirose Takakazu
• Kawase Kenichi
• Konishiike Isamu
• Kurasawa Shunsuke
• Iwama Masayuki
• Matsumoto Koichi

Classifications

• H01M50/133

  Thickness · CPC title

• H01M50/129

  with two or more layers of only organic material · CPC title

• H01M50/119

  Metals · CPC title

• H01M50/121

  Organic material · CPC title

• H01M2/0217

  Electricity · mapped topic