Lithium secondary battery
AssigneeDai-Ichi Kogyo Seiyaku Co., Ltd.
InventorsTetsuya Higashizaki, Toshinori Sugimoto, Yuji Hoshihara, Eriko Ishiko
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Abstract
A lithium ion secondary battery capable of charging in 15 minutes or less has a cathode with a composite layer on a surface of a collector having an active material and a conducting agent, an anode with an active material, an insulator between the cathode and anode, and an electrolyte with lithium ions. The cathode active material is represented by LixMPO4, where M is a metal atom and 0<x<2 and the conducting agent contains particles between 3 μm and 12 μm in size and in an amount of 1% or more by weight.
Claims3
A lithium ion secondary battery comprising a cathode comprising a cathode composite layer on a surface of a cathode collector comprising a cathode active material and a conducting agent;
- an anode comprising an anode active material;
- a separator insulating between the positive and anodes;
- and an electrolyte comprising lithium ions,
- wherein the cathode active material is represented by the following formula (I);
- the conducting agent contains particles having an average particle size of 3 μm or more and 12 μm or less in an amount of 1% by weight or more;
- a thickness of the cathode composite layer formed on the cathode collector is 50 μm or less per one surface;
- an electrode density of the anode is 1.55 g/cm3 or more;
- and an A/C ratio of a lithium capacity A that the anode can insert/desorb to a lithium capacity C that the cathode can insert/desorb is adjusted to 1.8≦A/C≦2.2:
- LixMPO4 (I)
- wherein M is a metal atom containing at least one kind of metal atoms selected from the group consisting of Co, Ni, Fe, Mn, Cu, Mg, Zn, Ti, Al, Si, B and Mo, and 0<x<2.
Dependencies are inferred from the claim text.