Production method of active material, and active material
AssigneeTDK Corporation
InventorAtsushi Sano
Life of this patent
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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.
Claims3
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.
Dependencies are inferred from the claim text.