Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Patent
1997-09-29
1999-12-21
Nuzzolillo, Maria
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
429221, 429224, 429225, H01M 448
Patent
active
060046953
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a novel nonaqueous secondary battery having a high discharge potential, a high capacity, satisfactory cycle characteristics, satisfactory storage stability, and excellent safety.
BACKGROUND OF THE INVENTION
With the recent spread of portable personal computers and mobile phones, the demand for secondary batteries having a higher capacity has been increasing. To meet the demand, extensive development of lithium secondary batteries having a high capacity is proceeding.
Metallic lithium and lithium alloys capable of realizing a high capacity have been used typically as a negative electrode material from the start of the development of lithium secondary batteries. Because these lithium materials form a dendrite that causes a danger of ignition or a burst, calcined carbonaceous materials capable of intercalating and desintercalating lithium have been put to practical use. However, carbonaceous materials have a disadvantage of a small discharge capacity.
JP-A-6-275268 (the term "JP-A" as used herein means an "unexamined published Japanese patent application") and JP-A-6-338325 describe the use of SnO and the use of a composite oxide comprising tin and other elements, respectively as a negative electrode material. Some of the negative electrode materials disclosed in these publications have a high capacity but insufficient cycle characteristics. In addition, the high capacity tends to give rise to such accidents as a sudden increase in battery temperature or a spout of the contents due to abnormalities such as a short circuit. That is, safety is not ensured sufficiently.
Accordingly, an object of the present invention is to provide a nonaqueous secondary battery having a high discharge potential, a high capacity, satisfactory cycle characteristics, and excellent safety.
DISCLOSURE OF THE INVENTION
The object of the invention is accomplished by a nonaqueous secondary battery comprising a positive electrode material, a negative electrode material, a nonaqueous electrolyte containing a lithium salt, and a separator, which is characterized in that the negative electrode material consists mainly of an amorphous oxide containing at least one functional element selected from Sn, Mn, Fe, Pb, and Ge, which embraces the following embodiments: material, a negative electrode material, a nonaqueous electrolyte containing a lithium salt, and a separator, which is characterized in that the negative electrode material consists mainly of an amorphous oxide containing at least one functional element selected from Sn, Mn, Fe, Pb, and Ge. negative electrode material consists mainly of an amorphous oxide containing Sn and Ge. characterized in that the negative electrode material consists mainly of an amorphous oxide containing at least one functional element selected from Sn, Mn, Fe, Pb, and Ge and at least one amorphous body-forming element (i.e., glass-forming element) selected from Al, B, P, elements of the groups 1, 2 and 3 of the Periodic Table, and halogen elements. characterized in that the negative electrode material consists mainly of an amorphous oxide containing at least one functional element selected from Sn, Mn, Fe, Pb, and Ge and at least one amorphous body-forming element having a standard electrode potential (25.degree. C.) of -3.05 to -2.30 E.sup.0 /V in an aqueous solution which is selected from the elements of groups 1, 2 and 3 of the Periodic Table and halogen elements. is characterized in that the negative electrode material consists mainly of an amorphous oxide containing at least one functional element selected from Sn, Mn, Fe, Pb, and Ge and at least one amorphous body-forming element selected from Mg, Al, B, P, and F. characterized in that the negative electrode material consists mainly of an amorphous oxide containing at least one functional element selected from divalent Sn, divalent Mn, trivalent Mn, divalent Fe, divalent Pb, and divalent Ge and at least one amorphous solid-forming element selected from Mg, Al, B, P, and F. characterized in that the
REFERENCES:
patent: 5618640 (1997-04-01), Idota et al.
patent: 5766791 (1998-06-01), Takahashi et al.
Goda Kensuke
Maekawa Yukio
Mishima Masayuki
Miyaki Yukio
Fuji Photo Film Co. , Ltd.
Martin Angela J.
Nuzzolillo Maria
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