Method for manufacturing electrochemical element electrode, electrochemical element electrode, and electrochemical element

Abstract

Provided is a method for easily and surely removing a protrusion from the surface of an active material layer formed during a vacuum process upon production of an electrochemical element electrode. The method for manufacturing an electrochemical element electrode includes: a first step which uses a vacuum process to form on a collector, an active material layer which can occlude and emit lithium; a second step which makes the active material layer to occlude the lithium; and a third step which removes the protrusion from the surface of the active material layer which has occluded the lithium.

Description

technical field [0001] The present invention relates to a method for producing an electrode for an electrochemical element that can be used in a lithium secondary battery and an electrochemical capacitor, an electrode for an electrochemical element, and an electrochemical element. Background technique [0002] In recent years, portable devices have been miniaturized and multifunctional, and accordingly, batteries that serve as power sources for portable devices are eagerly desired to have higher capacities. The theoretical capacity of carbon mainly used as the negative electrode active material is 372mAh / g. Silicon with a theoretical capacity of 4200mAh / g is expected to be seen as an active material capable of achieving higher capacity than carbon. Therefore, electrode materials mainly composed of silicon and structures of electrode materials mainly composed of silicon have been studied. [0003] One of them is an active material layer formed as a film mainly composed of s...

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Problems solved by technology

The bumping of the vapor deposition material is considered to be caused by impurities in the vapor deposition material put into the crucible and uneven temperature in the crucible. Although bumping can be reduced, it is difficult to eliminate

In particular, it is difficult to eliminate bumping when film formation is performed for a long time while replenishing the evaporating material

[0007] If a battery is manufactured using electrodes with protrusions, if the protrusions on the electrode surface are thicker than the separator (thickness: about 20 μm), the protrusions may penetrate the separator and cause an internal short circuit between the positive and negative electrodes.

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