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

A secondary battery and negative electrode technology, which is applied in the direction of secondary batteries, battery electrodes, electrode carriers/collectors, etc., can solve the problem of short circuit between the positive electrode and the negative electrode, and achieve the improvement of mass capacity density, volume capacity density, mass capacity density and High volume capacity density, effect of increasing volume capacity density

Pending Publication Date: 2021-10-01
WASEDA UNIV +1
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  • Abstract
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  • Claims
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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

Method used

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

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Embodiment 13

[0113] The result of the cycle test of the test cell of embodiment 13 is as follows Figure 15 shown. The cycle test result of the test battery of comparative example 1 is as follows Figure 16 shown. The cycle test result of the test battery of comparative example 2 is as follows Figure 17 shown. Figures 15-17 In , the vertical axis represents voltage, and the horizontal axis represents time.

[0114] In the test battery of Example 13, by Figure 15 It can be confirmed that 94 cycles of operation can be performed. Since there are two electrodes, among them, the mass of Li foil monolithic (2.67mg / cm 2 ) and the mass of the two composite films that constitute the first electrode and the second electrode (in each composite film, the mass of Cu is 0.12mg / cm 2 , the mass of CNT is 0.28mg / cm 2 ) has a total mass of 3.47mg / cm 2 , and the design capacity of the electrode is 4mAh / cm 2 , so the mass basis capacity density of each monolithic electrode is 2305mAh / g. The test...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/38H01M4/42H01M4/46H01M4/62H01M4/66H01M4/80H01M10/052H01M10/054
CPCH01M4/46H01M10/052H01M10/054H01M4/38H01M4/134H01M4/42Y02E60/10H01M4/808H01M4/806H01M4/661H01M4/663
Inventor 野田优堀圭佑前智太郎桥爪裕太
Owner WASEDA UNIV
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