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US 2003/0190530 A1Published application
Lithium Secondary Battery
AssigneeNone recorded
InventorsLi Yang, Toshihiro Yoshida, Hiroshi Nemoto, Michio Takahashi
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AssigneeNone recorded
InventorsLi Yang, Toshihiro Yoshida, Hiroshi Nemoto, Michio Takahashi
Estimating the term…
A lithium secondary battery includes: an electrode body having a positive electrode, a negative electrode, and a separator, the positive electrode and the negative electrode being wound or laminated by means of the separator; and a nonaqueous electrolyte solution containing a lithium compound as a electrolyte. At least one of the positive electrode, the negative electrode, the separator, the nonaqueous electrolyte solution contains at least one of: (a) an organic and/or inorganic inhibitor, which functions as a Cu-corrosion inhibitor or a Cu-trapping agent, (b) a compound having an organic base and an inorganic acid which are unitarily combined in a molecule, (c) a cyclic compound containing a N—O radical in a molecular structure, (d) a cyclic compound which becomes a Mn2+ supplier in the nonaqueous electrolyte solution, (e) a compound containing an atom showing Lewis acidity and an atom showing Lewis basisity in one molecule, (f) a three-dimensional siloxane compound, and (g) a nonionic surfactant; or the nonaqueous electrolyte solution contains: (h) a water-extracting agent, or (i) a hydrofluoric acid-extracting agent. This lithium secondary battery exhibits an excellent effect that self-discharge property, cycle characteristics, long period stability and reliability can be planned.
A lithium secondary battery comprising:
Dependencies are inferred from the claim text.
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Current conducting connections for cells or batteries: methods or arrangements for affording protection against corrosion; Selection of materials…
Electrodes composed of, or comprising, active material: electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators;…
Electrodes composed of, or comprising, active material: selection of inactive substances as ingredients for active masses, e.g. binders, fillers
Accumulators with non-aqueous electrolyte: li-accumulators
Term end not estimated
The present invention relates to a lithium secondary battery superior in self-discharge property, cycle characteristics, long period stability and reliability.
In recent years, lithium secondary batteries are widely used as chargeable-dischargeable secondary batteries having a small size and a large energy density to serve as a power source for electronic equipment such as portable communication equipment and a notebook-sized personal computer In addition, while requests for resource saving and energy saving are raised with international protection of the earth environment for a background, the lithium secondary battery is expected as a motor driving battery for an electric vehicle or a hybrid electric vehicle in the automobile business world, and as an effective measure for using electric power due to preservation of night electric power in the electric power business world. Thus, it is of urgent necessity to put a lithium secondary battery having a large capacity suitable for these uses to practical use.
It is general in a lithium secondary battery that a lithium transition metal compound oxide is used as a positive active material and carbon material such as hard carbon or graphite is used as a negative active material. In addition, since a lithium secondary battery using such materials has a high reaction potential of about 4.1V, an aqueous electrolyte solution cannot be employed as an aqueous electrolyte solution like conventional secondary batteries. Therefore, a nonaqueous electrolyte solution prepared by dissolving a lithium compound in an organic solvent is employed.
FIG. 1 is a perspective view showing a structure of a wound-type electrode body.
FIG. 2 is a perspective view showing a structure of a lamination-type electrode body.
FIG. 3 is a graph showing results of a cycle test of Examples 1-3 and Comparative Example 1.
Embodiments of the present invention are hereinbelow described. However, the present invention is by no means limited to these embodiments.
In a lithium secondary battery of the present invention, in at least one of the positive electrode, the negative electrode, the separator, the nonaqueous electrolyte solution is contained at least one of:
(a) an organic and/or inorganic inhibitor, which functions as a Cu-corrosion inhibitor or a Cu-trapping agent,