Cathode materials and lithium-ion secondary batteries

Abstract

To provide a positive electrode material capable of manufacturing a lithium ion secondary battery in which the initial decrease in battery capacity is suppressed and the decrease in battery capacity due to repeated charging and discharging is suppressed, as well as a lithium ion secondary battery manufactured using the positive electrode material.SOLUTION: A positive electrode material includes a positive electrode active material and two or more kinds of lithium alloys, each of which contains a metal element having an alloying potential with lithium of 0.5 V (vs. Li / Li+) or more.SELECTED DRAWING: None

Claims

1. It contains a positive electrode active material and two or more lithium alloys, The two or more lithium alloys mentioned above have an alloying potential of 0.5V (vs. Li / Li) with lithium. ＋ A positive electrode material having a specific composition and containing different metallic elements.

2. The positive electrode material according to claim 1, wherein the aforementioned metal element is selected from bismuth, tin, and antimony.

3. The positive electrode material according to claim 1, wherein the two or more lithium alloys include a combination of a lithium alloy containing bismuth and a lithium alloy containing antimony, a combination of a lithium alloy containing bismuth and a lithium alloy containing tin, or a combination of a lithium alloy containing tin and a lithium alloy containing antimony.

4. The positive electrode material according to claim 1, wherein at least a portion of the positive electrode active material and at least a portion of the lithium alloy form a composite.

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