# US 9,039,939 B2 · Production method of active material, and active material

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- Number: US 9,039,939 B2
- Document ID: US9039939B2
- Status: Granted
- Kind: B2
- Application number: 12/052,207
- Filed: 2008-03-20
- Published: 2008-10-02
- Granted: 2015-05-26
- Earliest claimed: 2007-03-29
- Assignees: TDK Corporation
- Applicants: Atsushi Sano
- Inventors: Atsushi Sano
- Web page: https://patentgrep.com/patent/US9039939B2

## CPC

- H01M 4/38: of elements or alloys
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/139: Processes of manufacture
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/387: {Tin or alloys based on tin}
- H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)}
- H01M 4/663: {containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- 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

A production method of an active material, and the active material are provided to realize an active material containing metal-containing particles and being capable of achieving satisfactory cycle performance and rate performance. The active material is produced by a method of polymerizing a mixture of a metal ion, a hydroxy acid, and a polyol to obtain a polymer, and a step of carbonizing the polymer. The active material used is one having a carbonaceous porous material, and metal particles and/or metal oxide particles supported in pores of the carbonaceous porous material, and particle diameter of the metal-containing particles are in the range of 10 to 300 nm.

## Claims

### Claim 1

An electrode for a lithium ion secondary battery comprising:
a collector; and
an active material layer formed on the collector, the active material layer comprising a binder and active material particles,
wherein:
the active material particles comprise:
a carbonaceous porous material having a specific surface area in a range of 50 to 500 m2/g; and
an aggregate of metal-containing particles supported in a pore of the carbonaceous porous material,
the metal-containing particles have a primary diameter in a range of 10 to 300 nm,
the metal-containing particles contain at least one metal selected from the group consisting of Sn, Ge, Sb, Ga, In, La, and Ce,
a pore diameter of the carbonaceous porous material is 0.1 to 5 μm, and
the aggregate of the metal-containing particle has a secondary diameter in a range of 100 to 5000 nm.

### Claim 2 (depends on 1)

An electrochemical device comprising the electrode of claim 1.

### Claim 3 (depends on 1)

The electrode according to claim 1, wherein the active material layer further comprises an electrolyte solution containing a lithium salt.