# US 10,312,518 B2 · Anode and method of manufacturing the same, and secondary battery

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- Number: US 10,312,518 B2
- Document ID: US10312518B2
- Status: Granted
- Kind: B2
- Application number: 12/255,279
- Filed: 2008-10-21
- Published: 2009-04-30
- Granted: 2019-06-04
- Earliest claimed: 2007-10-26
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Hiroyuki Yamaguchi; Hideki Nakai; Masayuki Ihara; Tadahiko Kubota; Shigeru Fujita
- Inventors: Hiroyuki Yamaguchi; Hideki Nakai; Masayuki Ihara; Tadahiko Kubota; Shigeru Fujita
- Web page: https://patentgrep.com/patent/US10312518B2

## CPC

- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/139: Processes of manufacture
- H01M 10/052: Li-accumulators
- H01M 10/0567: characterised by the additives
- H01M 10/0568: characterised by the solutes
- H01M 10/0569: characterised by the solvents
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An anode and a secondary battery capable of improving the charge and discharge efficiency are provided. The anode includes an anode current collector, and an anode active material layer provided on the anode current collector. The anode active material layer has a plurality of anode active material particles containing at least one of a simple substance of silicon, a compound of silicon, a simple substance of tin and a compound of tin, and has a coat containing an oxo acid salt in at least part of the surface of the anode active material particles.

## Claims

### Claim 1

A secondary battery comprising:
a cathode;
an anode; and
an electrolytic solution,
wherein,
the anode comprises an anode current collector and an anode active material layer on the anode current collector,
the anode active material layer comprises anode active material particles layered on the current collector,
the anode active material particles comprise (1) particles with at least one of silicon or tin, (2) a coat coating at least a portion of the anode active material particles, the coat consisting of lithium metaborate,
the coat coats exposed outer surfaces of the anode active material particles such that the particles are coated with the coat down to roots thereof.

### Claim 2 (depends on 1)

The secondary battery according to claim 1, wherein the anode active material particles have a multilayer structure in the particles as would result from vapor deposition.

### Claim 3 (depends on 1)

The secondary battery according to claim 1, wherein the electrolytic solution includes a borate.

### Claim 4 (depends on 3)

The secondary battery according to claim 3, wherein a content of the borate in the electrolytic solution is in the range from 0.01 wt % to 5 wt %.

### Claim 5 (depends on 1)

The secondary battery according to claim 1, wherein the electrolytic solution includes at least one of 4-fluoro-1,3-dioxolane-2-one, 4,5-difluoro-1,3-dioxolane-2-one, fluoromethyl methyl carbonate, bis(fluoromethyl)carbonate, or difluoromethyl methyl carbonate.

### Claim 6 (depends on 1)

The secondary battery according to claim 1, wherein the electrolytic solution includes sultone.

### Claim 7 (depends on 1)

The secondary battery according to claim 1, wherein the cathode comprises a complex oxide containing lithium and nickel.

### Claim 8 (depends on 1)

The secondary battery according to claim 1, wherein the anode active material particles include silicon and oxygen or carbon.

### Claim 9 (depends on 1)

The secondary battery according to claim 1, wherein the anode active material particles include an alloy containing silicon and at least one selected from the group consisting of tin, nickel, copper, iron, cobalt, manganese, zinc, indium, silver, titanium, germanium, bismuth, antimony, and chromium.

### Claim 10 (depends on 1)

The secondary battery according to claim 1, wherein the anode active material layer includes a carbon material particle.

### Claim 11 (depends on 1)

The secondary battery of claim 1, wherein the anode further includes, metal material in the gaps, the metal material comprising a metal element that does not alloy with an anode reactant.

### Claim 12 (depends on 11)

The secondary battery of claim 11, wherein the metal element is selected from the group consisting of iron, cobalt, nickel, zinc, and copper.

### Claim 13 (depends on 11)

The secondary battery of claim 11, wherein: the metal material fills the gaps, and voids at upper surfaces of the anode active material particles coated with the first and second coats.

### Claim 14 (depends on 11)

The secondary battery of claim 11, wherein the metal material fills 20% or more of all space of the gaps.

### Claim 15 (depends on 11)

The secondary battery of claim 11, wherein the metal material fills 40% or more of all space of the gaps.

### Claim 16 (depends on 11)

The secondary battery of claim 11, wherein the metal material fills 80% or more of all space of the gaps.