Secondary battery negative electrode, secondary battery, and manufacturing method of secondary battery negative electrode

Abstract

A secondary battery negative electrode which suppresses the occurrence of dendrites and which has high mass capacity density and volume capacity density, a secondary battery, and a manufacturing method of the secondary battery negative electrode are provided. This secondary battery negative electrode 13 is characterized by being provided with: a second three-dimensional current collector 18 formed from a self-supporting sponge-like structure of second carbon nanotubes 17; a negative electrode active substance 19 as a metal active substance contained inside of the second three-dimensional current collector 18; and multiple seed particles 20 which are contained inside of the second three-dimensional current collector 18 and which are configured from a substance different from that of the negative electrode active substance 19, wherein the negative electrode does not contain foil of the metal active substance. The secondary battery 10 is characterized by being provided with the secondary battery negative electrode 13, and a secondary battery positive electrode 12 in which the thickness reversibly changes with charging / discharging, with the thickness decreasing during charging and increasing during discharging.

Description

technical field [0001] The invention relates to a negative pole for a secondary battery, a secondary battery and a method for manufacturing the negative pole for the secondary battery. Background technique [0002] Metal anodes using metal active materials such as metal Li (Li) have attracted attention as anodes for high-energy-density secondary batteries due to their high theoretical capacity and low anode potential. However, in a secondary battery using a metal negative electrode, metal dendrites (Dendrite) grow on the surface of the metal negative electrode due to the dissolution / precipitation of the metal accompanying charge and discharge, and the grown dendrites penetrate the separator and come into contact with the positive electrode. Positive and negative short circuits. Therefore, metal negative electrodes that suppress the formation of dendrites have been proposed (for example, Non-Patent Document 1). [0003] Non-Patent Document 1 describes a metal negative elect...

AI Technical Summary

Problems solved by technology

However, in a secondary battery using a metal negative electrode, metal dendrites (Dendrite) grow on the surface of the metal negative electrode due to the dissolution / precipitation of the metal accompanying charge and discharge, and the grown dendrites penetrate the separator and come into contact with the positive electrode. Positive and negative short circuit problem

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