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Anode for secondary battery, its manufacturing method and secondary battery

A secondary battery and manufacturing method technology, applied in the direction of electrode manufacturing, secondary batteries, battery electrodes, etc., can solve the problems of not being able to obtain sufficient charge-discharge cycle characteristics, difficulties, etc., and achieve the effect of excellent charge-discharge cycle performance

Active Publication Date: 2009-03-18
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, since the amount of lithium ions that can be used decreases, it is difficult to design the battery capacity to the maximum extent, and sufficient charge-discharge cycle characteristics cannot be obtained when the battery is actually used.

Method used

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  • Anode for secondary battery, its manufacturing method and secondary battery
  • Anode for secondary battery, its manufacturing method and secondary battery
  • Anode for secondary battery, its manufacturing method and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0153] In this embodiment, a negative electrode active material layer is formed on the negative electrode current collector by vacuum evaporation, and it is used as the negative electrode 1 to make the square lithium ion secondary battery 10 shown in FIG. 2 in the embodiment. , and measured its charge-discharge cycle characteristics. Below, it demonstrates concretely.

[0154] First, negative electrode 1 having amorphous silicon having different degrees of local order as a negative electrode active material layer was fabricated as follows.

[0155] When forming the negative electrode 1 , a vacuum vapor deposition device shown in FIG. 5 was used as an electrode forming device. A strip-shaped electrolytic copper foil having a thickness of 24 μm, a surface roughness Rz value of 2.5 μm, and roughening on both sides was used as the negative electrode current collector; a silicon single crystal was used as the vapor deposition material. The film forming speed was set at 50-100 nm / ...

Embodiment 4～9

[0186]In this example, the lithium ion secondary battery 10 was fabricated in the same manner as in Examples 1 to 3 except that the negative electrode active material layer was formed by the sputtering method.

[0187] When forming the negative electrode 1 , a facing target type DC sputtering device (not shown) was used as an electrode forming device. A strip-shaped electrolytic copper foil with a thickness of 24 μm, a surface roughness Rz value of 2.5 μm, and roughened on both sides was used as the negative electrode current collector, and a silicon single crystal was used as the vapor deposition material. The film formation rate was 0.5 nm / s, and a negative electrode active material layer with a thickness of 5 to 6 μm was formed. At this time, the DC power was 1kW, argon gas was used as the discharge gas, and negative electrode active material layers with various levels of local order were formed by adjusting film formation conditions such as negative electrode current colle...

Embodiment 10～16

[0201] In this example, as in examples 1 to 3, a negative electrode active material layer was formed by a vacuum evaporation method to fabricate a lithium ion secondary battery 10 . The difference from Examples 1 to 3 is that oxygen is directly introduced into the flow of the vapor deposition material of silicon from the vapor deposition source to the negative electrode current collector, and negative electrode active material layers having different oxygen contents are formed. The film forming speed is fixed at 50nm / s. The temperature of the negative electrode current collector and the flow rate of oxygen were as follows.

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Abstract

Provides is an anode for a secondary battery which is suitable for a lithium ion secondary battery and has a high capacity and is excellent in charge / discharge characteristics and generates little of an irreversible capacity. Silicon in an anode active substance layer provided in an anode current collector has an amorphous structure with a low degree of a local order. A Raman spectrum in the amorphous structure after an initial charge / discharge satisfies a relation of 0.25 <=LA / TO and / or a relation of 0.45 <=LO / TO wherein TO is a strength at a dispersing peak occurring near a shift position 480 cm<-1>; by dispersing due to traverse wave optical phonon, LA is a strength at a dispersing peak occurring near a shift position 300 <-1>; by dispersing due to longitudinal wave acoustic phonon and LO is a strength at a dispersing peak occurring near a shift position 400 <-1>; due to longitudinal wave optical phonon.

Description

technical field [0001] The present invention relates to a negative electrode for a secondary battery suitable for a lithium ion secondary battery or the like, and a method for producing the same, and more specifically, to a negative electrode for a secondary battery with less occurrence of irreversible capacity, a method for producing the same, and a secondary battery using the same . Background technique [0002] In recent years, mobile equipment has been increasing in performance and multi-function. Along with the increase in performance and multi-function, secondary batteries used as power sources in mobile equipment are also required to be smaller, lighter, and thinner, and higher capacity is required. change. [0003] Lithium-ion secondary batteries are examples of secondary batteries that can be obtained in response to this demand. The battery characteristics of lithium ion secondary batteries vary greatly depending on the electrode active material used and the like....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/04H01M10/40
CPCH01M4/70Y02E60/122H01M4/661H01M4/38H01M4/134Y02E60/10
Inventor 小西池勇川濑贤一
Owner MURATA MFG CO LTD
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