Lithium secondary battery and method for producing same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHiroyuki Yamaguchi
Life of this patent
Estimating the term…
Abstract
This invention provides a lithium secondary battery capable of bringing about greater cycle characteristics, being in a 4.2 V or higher class. The lithium secondary battery provided by this invention is a 4.2 V or higher class lithium secondary battery using a lithium transition metal composite oxide as a positive electrode active material. The lithium secondary battery comprises a negative electrode at or around which a silicon-containing cyclic compound and/or a reaction product thereof are present. The silicon-containing cyclic compound comprises at least one silicon atom in its ring and has a vinyl group.
Claims11
A method for producing a 4.2 V or higher class lithium secondary battery, the method comprising:
- obtaining a positive electrode and a negative electrode, the positive electrode comprising a lithium transition metal composite oxide as a positive electrode active material;
- obtaining a non-aqueous electrolyte comprising a silicon-containing cyclic compound;
- and
- supplying the non-aqueous electrolyte obtained to an electrode body comprising the positive electrode and the negative electrode,
- wherein the silicon-containing cyclic compound comprises at least one silicon atom in its ring and has at least one vinyl group, and
- the silicon-containing cyclic compound is a vinyl group-containing cyclic siloxane represented by a formula (1):
- wherein R1 and R2 are either the same or different with each being an organic group having 1 to 12 carbon atoms, at least either R1 or R2 includes a vinyl group, and n is an integer between 3 and 10.
A 4.2 V or higher class lithium secondary battery comprising:
- a positive electrode comprising a lithium transition metal composite oxide as a positive electrode active material;
- a negative electrode;
- and
- a non-aqueous electrolyte including a silicon-containing cyclic compound, wherein the silicone-containing cyclic compound comprises at least one silicon atom in its ring and has at least one vinyl group, and
- the silicon-containing cyclic compound is a vinyl group-containing cyclic siloxane represented by a formula (1):
- wherein R1 and R2 are either the same or different with each being an organic group having 1 to 12 carbon atoms, at least either R1 or R2 includes a vinyl group, and n is an integer between 3 and 10.
Dependencies are inferred from the claim text.