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Negative electrode for secondary battery and secondary battery

A technology for secondary batteries and negative electrodes, applied in secondary battery manufacturing, battery electrodes, electrode carriers/current collectors, etc. High discharge capacity and the effect of suppressing expansion and contraction

Inactive Publication Date: 2013-09-18
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when the amount of occlusion of carrier ions increases, the volume change accompanying the occlusion and release of carrier ions during the charge-discharge cycle is large, and the adhesion between the current collector and silicon decreases, and the battery characteristics are affected by charge-discharge. the deterioration of
Furthermore, sometimes there is a serious problem that the silicon deteriorates and peels off or becomes micronized, so that the function as a battery cannot be maintained.
As a result, the amount of reaction between silicon and carrier ions decreases, which leads to a decrease in the charge and discharge capacity, and makes rapid charge and discharge of the secondary battery difficult.
[0012] In addition, the columnar structure of the active material described in Patent Document 1 is only placed on the rough surface of the current collector in close contact with the bottom, so the bonding strength between the current collector and the active material is extremely low.

Method used

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  • Negative electrode for secondary battery and secondary battery
  • Negative electrode for secondary battery and secondary battery
  • Negative electrode for secondary battery and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0056] In this embodiment, use Figure 1A to Figure 8C The structure and method of manufacturing the negative electrode for a secondary battery that exhibits little deterioration due to charge and discharge and has high charge and discharge cycle characteristics will be described.

[0057] The secondary battery is a secondary battery that uses an electrolytic solution and uses carrier ions for charge and discharge reactions. In particular, a secondary battery using lithium ions as carrier ions is called a lithium secondary battery. In addition, examples of carrier ions that can replace lithium ions include alkali metal ions such as sodium and potassium, alkaline earth metal ions such as calcium, strontium, and barium, beryllium ions, and magnesium ions.

[0058] (Structure of negative electrode)

[0059] Figure 1A It is a cross-sectional view schematically showing an enlarged surface portion of a negative electrode current collector. The negative electrode current collecto...

Embodiment approach 2

[0151] In this embodiment, the structure and manufacturing method of the secondary battery will be described.

[0152] First, the positive electrode and its manufacturing method will be described.

[0153] Figure 9A is a cross-sectional view of the positive electrode 300 . For the positive electrode 300 , a positive electrode active material layer 302 is formed on a positive electrode current collector 301 .

[0154] For the positive electrode current collector 301, a highly conductive material such as metals such as stainless steel, gold, platinum, zinc, iron, copper, aluminum, and titanium, and alloys thereof can be used. In addition, as the positive electrode current collector 301 , an aluminum alloy to which an element improving heat resistance such as silicon, titanium, neodymium, scandium, and molybdenum is added can be used. In addition, the positive electrode current collector 301 can also be formed using a metal element that reacts with silicon to form a silicide....

Embodiment approach 3

[0210] A secondary battery according to one aspect of the present invention can be used as a power source for various electric devices driven by electricity.

[0211] Specific examples of electrical equipment using the secondary battery according to one aspect of the present invention include display devices such as televisions and monitors, lighting devices, desktop or notebook personal computers, word processors, playback and storage on DVD (Digital Versatile Disc (Digital Versatile Disc) and other image reproduction devices for still images or moving images in recording media such as portable CD players, radios, tape recorders, headphone speakers, stereos, desk clocks, wall clocks, cordless telephone handsets, walkie-talkies Telephones, portable wireless devices, mobile phones, car phones, portable game consoles, toys, calculators, portable information terminals, electronic notebooks, electronic book readers, electronic translators, voice input devices, video cameras, digita...

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Abstract

A negative electrode for a secondary battery and a secondary battery using the negative electrode are provided. The negative electrode includes a current collector, an active material layer, and a high molecular material layer. The current collector includes a plurality of protrusion portions extending substantially perpendicularly and a base portion which includes the same material as the plurality of protrusion portions and is connected to the plurality of protrusion portions. The protrusion portions and the active material layer covering the protrusion portions form negative electrode protrusion portions. The base portion and the active material layer covering the base portion form a negative electrode base portion. Part of side surfaces of the negative electrode protrusion portions including basal portions thereof and a top surface of the negative electrode base portion are covered with the high molecular material layer.

Description

technical field [0001] The invention relates to a negative pole for a secondary battery and the secondary battery. Background technique [0002] In recent years, due to advances in environmental technology, development of power generation devices (for example, photovoltaic power generation) that imposes less burden on the environment than conventional power generation methods has been vigorously carried out. Furthermore, along with the development of power generation technology, the development of secondary batteries such as lithium secondary batteries, lithium ion capacitors, and air batteries is also being developed. [0003] Especially for secondary batteries, portable information terminals such as mobile phones, smartphones, and notebook PCs, electrical equipment such as portable music players, and digital cameras, or medical equipment, or hybrid electric vehicles (HEV), electric vehicles (EV) or With the development of the semiconductor industry such as next-generation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/70H01M4/04H01M10/04
CPCH01M4/134H01M4/1395H01M4/386H01M4/622H01M4/661H01M4/70Y02E60/10Y02P70/50
Inventor 小国哲平田岛亮太
Owner SEMICON ENERGY LAB CO LTD