Non-aqueous electrolyte second battery

Abstract

The present invention provides a non-aqueous electrolyte second battery which uses a material having Si and O as component elements in a cathode active material, and can ensure good charge-discharge cycling performance and can suppress expansion. The above problem can be solved through the following non-aqueous electrolyte second battery. The non-aqueous electrolyte second battery has an anode having an anode mixture layer containing an anode active material and an adhesive at a single side or two sides of a current collector, wherein the anode mixture layer contains lithium-contained composite oxide to serve as the anode active material, and contains vinylidene fluoride-chlorotrifluoroethylene copolymer to serve as the adhesive, the lithium-contained composite oxide contains specific quantity of nickel to serve as a transition metal element, the non-aqueous electrolyte second battery has a cathode having a cathode mixture layer containing a cathode active material at a single side or two sides of the current collector, wherein the cathode mixture layer contains the material having Si and O as the component element (wherein, atomic ratio x of the O relative to the Si satisfies the formula of 0.5 <= x <= 1.5) and a graphite carbon material to serve as the cathode active material.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery which has good charge-discharge cycle characteristics and can suppress swelling. Background technique [0002] Nonaqueous electrolyte secondary batteries including lithium ion secondary batteries are widely used as power sources for various portable devices because of their high voltage and high capacity. In addition, in recent years, it has also been seen to expand to medium-sized and large-sized applications such as power tools such as electric tools, electric vehicles, and electric bicycles. [0003] In particular, batteries used in mobile phones, game machines, etc., which are being miniaturized and multifunctional, require higher capacity, and as a method for this, research and development of electrode active materials exhibiting high charge-discharge capacity are being conducted. Among them, silicon (Si), tin (Sn), and other materials that can absorb and release more li...

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Problems solved by technology

[0004] However, it is also known that due to the SiO x The volume expansion and shrinkage with the charge-discharge reaction is large, so there will be problems that the particles are crushed every battery charge-discharge cycle, the Si precipitated on the surface reacts with the non-aqueous electrolyte solvent, and the irreversible capacity increases, or due to This reaction generates gas inside the battery, and the battery can swells, etc.

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