Winding battery

Abstract

A wound-type accumulator which is simplified in the layout of lithium ion sources and shortened in time spent on injecting a nonprotonic organic solvent electrolytic solution and on predoping, so as to allow quick completion of assembly and obtain high productivity. The wound-type accumulator is provided with: a cylindrical wound electrode unit which has cathode and anode strips and is configured by winding from one end an electrode stack comprised of a stack of the cathode and anode with a separator disposed therebetween; and an electrolytic solution. In this wound-type accumulator, the cathode and / or anode is doped with lithium ions and / or anions by means of electrochemical contact of the cathode and / or anode with a lithium ion source. At the cathode, a cathode gap section is formed, and at least one lithium ion source is arranged at the cathode gap section or at a position opposing the cathode gap section at the anode, in a state not contacting the cathode.

Description

technical field [0001] The present invention relates to a wound storage battery having a wound electrode unit configured by stacking and winding a positive electrode and a negative electrode with a separator interposed therebetween. Background technique [0002] In recent years, negative electrodes made of carbon materials such as graphite and LiCoO 2 A battery with a positive electrode composed of a lithium metal oxide. This battery is a so-called rocking chair battery, and when the battery is charged after assembly, lithium ions are supplied from the lithium-containing metal oxide constituting the positive electrode to the negative electrode, and lithium ions are returned from the negative electrode to the positive electrode during discharge. Metal lithium is used and only lithium ions participate in charging and discharging, so it is called a lithium-ion secondary battery, which is different from a lithium battery using lithium metal. This lithium ion secondary battery ...

AI Technical Summary

Problems solved by technology

[0005] In such organic electrolytic capacitors, high performance is expected, but there are problems in that it takes an extremely long time to dope lithium ions in the negative electrode in advance, and it is necessary to uniformly support lithium ions on the entire negative electrode. Large, high-capacity batteries such as cylindrical batteries with electrodes wound around them or square batteries with stacked electrodes are difficult to put into practical use

[0009] However, in such a wound storage battery, lithium metal is provided only on either one of the outer peripheral surface and the inner peripheral surface of the electrode element. Therefore, there is a problem that it takes a long time to uniformly dope the entire negative electrode with lithium ions.

Moreover, when the lithium ion supply source is provided only on the outer peripheral surface of the electrode winding unit, although high voltage and high capacity are obtained, the amount of doped lithium ions increases, so it is necessary to use a lithium ion supply source with a large thickness. The following problems: the filling amount of the electrode is reduced, and it is difficult to obtain a sufficiently high energy density

Especially in the case of manufacturing a large wound lithium ion battery, since the number of windings is increased, the time required for the doping increases to, for example, about 30 days, and therefore, its productivity is significantly reduced.

[0017] In addition, in the wound storage battery described in Patent Document 3, since the lithium ion supply source is arranged on the inner peripheral surface and the outer peripheral surface after the electrode wound unit is assembled, the manufacturing process is complicated, and thus there is a problem that it cannot be obtained. high productivity problem

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