Nonaqueous electrolyte secondary battery

Abstract

A nonaqueous electrolyte secondary battery comprises a cathode having a cathode active material capable of electrochemically doping / dedoping lithium, an anode having an anode active material capable of electrochemically doping / dedoping lithium and a nonaqueous electrolyte interposed between the cathode and the anode. The nonaqueous electrolyte includes at least one or more kinds of vinylene carbonate, methoxybenzene compounds or antioxidants. The nonaqueous electrolyte secondary battery has a good cyclic characteristic under any environment of low temperature, ambient temperature and high temperature.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte battery comprising a cathode, an anode and a nonaqueous electrolyte. In particular, the present invention relates to a nonaqueous electrolyte battery having excellent cycle characteristics under any environment of low temperature, room temperature and high temperature. Background technique [0002] Recently, various portable electronic devices such as camcorders with video tape recorders, portable phones, laptop computers, etc. have been developed and provided, while reducing their size and weight. Accordingly, studies and developments have been conducted to improve the energy density of portable power sources for these electronic devices, such as batteries, especially secondary batteries. Because the energy density of lithium-ion secondary batteries is greater than that of lead batteries and nickel-cadmium batteries. Lead batteries and nickel-cadmium batteries are traditional aqueous electroly...

AI Technical Summary

Problems solved by technology

In particular, since a rectangular battery case has lower strength than a cylindrical battery case, it is easily deformed due to an increase in the internal pressure of the battery

Therefore, in the case of using a rectangular battery housed in an electronic device, the battery may swell due to the decomposition of the electrolyte solution in the battery when the battery is exposed to high temperature, which will cause the battery to rupture or the electronic device to be damaged.

[0006] However, in an information terminal of a notebook-type personal computer in which a high-performance CPU is fixed, a rise in temperature due to heat generated by the CPU adversely affects the battery

Therefore, although the fan that releases heat is installed near the CPU, it cannot be said that this measure alone can completely prevent adverse effects

Also, since higher performance CPUs are expected in the future, it may have a worse impact on the battery

In a non-aqueous secondary battery using a lithium-manganese composite oxide, its performance is similar to that of a lithium-cobalt composite oxide or a lithium-nickel composite oxide at room temperature, however, the high-temperature cycle characteristics are not perfect because at high temperatures (45°C -60°C) does not yield sufficient battery characteristics from spinel lithium manganese oxide

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