Electrochemical device and electrode active material for electrochemical device
View Patent ↗An electrochemical device of the present invention comprises a positive electrode, a negative electrode and an electrolyte, wherein at least one of the positive electrode and the negative electrode includes a compound having a structure represented by the general formula (1): It is thereby possible to obtain a lightweight and high energy-density electrochemical device having an excellent cycle characteristic.
1. A secondary battery, comprising a positive electrode, a negative electrode and an electrolyte,
wherein at least one of said positive electrode and said negative electrode includes an electrode active material comprising a polymer compound having a structure represented by the general formula (1a):
where X is a sulfur atom or an oxygen atom; each of R 1 to R 4 is independently a linear or cyclic aliphatic group, a hydrogen atom, a hydroxyl group, a cyano group, an amino group, a nitro group or a nitroso group; each of R 5 and R 6 is independently a linear or cyclic aliphatic group, or a hydrogen atom; said aliphatic group includes at least one selected from the group consisting of an oxygen atom, a nitrogen atom, a sulfur atom, a silicon atom, a phosphorus atom, a boron atom, and a halogen atom, and
wherein any from the group consisting of R 3 , R 4 , R 5 or R 6 is further bonded to another molecule in a polymer chain.
2. The secondary battery in accordance with claim 1 , wherein said polymer compound contains more than one structure represented by the general formula (1a).
3. The secondary battery in accordance with claim 1 , wherein said polymer compound has a polyacetylene chain or a polymethacrylate chain as a main chain.
4. The secondary battery in accordance with claim 1 , wherein the number of carbon atoms in the aliphatic group is in the range of 1 to 6.
5. The secondary battery in accordance with claim 1 ,
wherein said electrolyte comprises a solvent, and an anion and a cation that diffuse in said solvent, and said polymer compound is capable of forming a coordinate bond with said cation through an oxidation-reduction reaction.
6. The secondary battery in accordance with claim 5 , wherein said cation is a lithium ion.
7. The secondary battery in accordance with claim 1 , wherein said positive electrode includes said polymer compound as a positive electrode active material, and said negative electrode includes a carbon material as a negative electrode active material.
8. The secondary battery in accordance with claim 1 , wherein said positive electrode includes said polymer compound as a positive electrode active material, and said negative electrode includes, as a negative electrode active material, at least one selected from the group consisting of a lithium metal, a lithium-containing composite nitride and a lithium-containing composite titanium oxide.
9. The secondary battery in accordance with claim 1 , wherein said negative electrode includes said polymer compound as a negative electrode active material, and said positive electrode includes a metal oxide material as a positive electrode material.
10. The secondary battery in accordance with claim 1 , wherein, when said polymer compound is used as an electrode active material, a conductive material is mixed into the electrode active material.
11. The secondary battery in accordance with claim 1 , wherein, when said positive electrode includes said polymer compound as a positive electrode active material, one of the following is used as the negative electrode material of said negative electrode: a carbon material, a lithium metal, a lithium-containing composite nitride, a lithium-containing composite titanium oxide, a composite material of tin and carbon, and a composite material of tin and another metal.
12. The secondary battery in accordance with claim 1 , wherein said polymer compound is a compound of general formula (9):
where n is not less than 1.
13. The secondary battery in accordance with claim 1 , wherein said polymer compound is a compound of general formula (10):
where n is not less than 1.
14. The secondary battery in accordance with claim 1 , wherein said polymer compound has the following general formula:
where n is not less than 1.
15. A secondary battery, comprising a positive electrode, a negative electrode and an electrolyte,
wherein at least one of said positive electrode and said negative electrode includes an electrode active material comprising a compound having a structure represented by the general formula (9):
where n=4 to 10.
16. A secondary battery, comprising a positive electrode, a negative electrode and an electrolyte,
wherein at least one of said positive electrode and said negative electrode includes an electrode active material comprising a compound having a structure represented by the general formula (10):
where n=4 to 10.