Nonaqueous Lithium Storage Element
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsNobuhiro Okada, Takeshi Kamijo, Shiro Mori, Takashi Yamasaki, Akiko Kaneko
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Abstract
Provided is a nonaqueous lithium storage element which is obtained by housing an electrode body and a nonaqueous electrolyte solution containing a lithium salt in an outer case, said electrode body being composed of a negative electrode that is composed of a negative electrode collector and a negative electrode active material layer laminated on one or both surfaces of the negative electrode collector, a positive electrode that is composed of a positive electrode collector and a positive electrode active material layer laminated on one or both surfaces of the positive electrode collector, and a separator.
Claims9
A nonaqueous lithium-type storage element comprising:
- a casing;
- an electrode body;
- and
- a nonaqueous electrolytic solution containing a lithium salt;
- wherein the electrode body and nonaqueous electrolytic solution are stored within the casing,
- the electrode body comprises:
- a negative electrode comprising a negative electrode collector, and a negative electrode active material layer laminated on one surface or both surfaces of the negative electrode collector;
- a positive electrode comprising a positive electrode collector, and a positive electrode active material layer laminated on one surface or both surfaces of the positive electrode collector;
- and
- a separator;
- the negative electrode active material layer contains a negative electrode active material,
- the negative electrode active material contains an activated carbon, and
- initial-time lithium charge/discharge characteristics of the negative electrode active material satisfy following 1) and 2):
- 1) a charging amount is 1100 mAh/g to 2000 mAh/g;
- and
- 2) a discharging amount is 100 mAh/g or higher at a negative electrode potential of 0 to 0.5 V.
A nonaqueous lithium-type storage element comprising:
- a casing;
- an electrode body;
- and
- a nonaqueous electrolytic solution containing a lithium salt;
- wherein the electrode body and nonaqueous electrolytic solution are stored within the casing,
- the electrode body comprises:
- a negative electrode comprising a negative electrode collector, and a negative electrode active material layer laminated on one surface or both surfaces of the negative electrode collector;
- a positive electrode comprising a positive electrode collector, and a positive electrode active material layer laminated on one surface or both surfaces of the positive electrode collector;
- and
- a separator;
- the negative electrode active material layer contains a negative electrode active material,
- the negative electrode active material contains a composite porous material in which a pitch coal is deposited on a surface of an activated carbon, and
- the negative electrode active material satisfies following i) and ii):
- i) a weight ratio of the pitch coal relative to the activated carbon is 10% to 60%, and a softening point of a pitch as a raw material of the pitch coal is 100° C. or lower;
- and
- ii) the negative electrode active material has a BET specific surface area of 350 m2/g to 1500 m2/g, and is doped with lithium ions in an amount of 1100 mAh/g to 2000 mAh/g.
Dependencies are inferred from the claim text.