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Anode and battery

A negative electrode current collector and negative electrode technology, applied in the direction of secondary batteries, battery electrodes, lithium storage batteries, etc., can solve the problems of secondary battery discharge capacity decrease, secondary battery manufacturing yield decrease, secondary battery cycle characteristics degradation, etc. , to achieve the effect of improving cycle characteristics and manufacturing yield

Inactive Publication Date: 2008-12-10
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More specifically, when the surface area of ​​the negative electrode active material is too large, the electrolyte decomposes during charge and discharge, and lithium loses its activity, so that the discharge capacity of the secondary battery decreases when charge and discharge are repeated.
As a result, cycle characteristics, which are important characteristics of secondary batteries, deteriorate
On the other hand, when the surface area of ​​the negative electrode active material is too small, the space used during the expansion of the negative electrode active material (spatial margin) is insufficient, and thus the stress effect caused by the expansion causes wrinkles in the negative electrode current collector.
Therefore, the entire negative electrode is deformed to cause a short circuit, and the manufacturing yield of the secondary battery is reduced.

Method used

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  • Anode and battery
  • Anode and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0135] Manufactured by the following steps Figure 8 with Figure 9 The laminated film type secondary battery shown. At this time, the laminated film type secondary battery is a lithium ion secondary battery in which the capacity of the negative electrode 54 is expressed based on insertion and extraction of lithium.

[0136] First, the positive electrode 53 is formed. Mix lithium carbonate (Li 2 CO 3 ) and cobalt carbonate (CoCO 3 ), the mixture was calcined in air at 900°C for 5 hours to obtain a lithium cobalt composite oxide (LiCoO 2 ). Next, after mixing 91 parts by weight of lithium-cobalt composite oxide as the negative electrode active material, 6 parts by weight of graphite as the conductive agent and 3 parts by weight of polyvinylidene fluoride as the binder to form the positive electrode mixture, the positive electrode mixture was dispersed in N -Methyl-2-pyrrolidone, thereby forming a pasty positive electrode mixture slurry. Finally, the positive electrode m...

Embodiment 1-2～1-12

[0142] Form the secondary battery by the same steps as in Example 1-1, the difference is that the peak aperture is 100nm (Example 1-2), 120nm (Example 1-3), 150nm (Example 1-4), 200nm (Example 1-5), 300nm (Example 1-6), 400nm (Example 1-7), 500nm (Example 1-8), 600nm (Example 1-9), 800nm ​​(Example 1-9) 10), 1000nm (Examples 1-11) or 1200nm (Examples 1-12) instead of 80nm.

Embodiment 2-1～2-12

[0158] A secondary battery was formed through the same steps as in Examples 1-1 to 1-12, except that the negative electrode active material had a six-layer structure. In the case of forming the anode active material, silicon was continuously deposited for lamination while the anode current collector 54A moved back and forth relative to the evaporation source at a deposition rate of 100 nm / s.

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Abstract

A battery capable of improving cycle characteristics and a manufacturing yield is provided. An anode includes: an anode current collector; and an anode active material layer arranged on the anode current collector, in which the anode active material layer includes an anode active material including a plurality of pores, and the rate of change in the amount of mercury intruded into the plurality of pores is distributed so as to have a peak in a diameter range from 80 nm to 1200 nm both inclusive, the amount of mercury intruded being measured by mercury porosimetry.

Description

technical field [0001] The present invention relates to a negative electrode including a negative electrode current collector and a negative electrode active material layer arranged on the negative electrode current collector, and a battery including the negative electrode. Background technique [0002] In recent years, portable electronic devices such as camera-integrated VTRs (Video Tape Recorders), cellular phones or handheld computers have been widely used, and there is a strong need to reduce the size and weight of portable electronic devices and extend their lifespan. Thus, the development of batteries as power sources for portable electronic devices, particularly lightweight secondary batteries capable of achieving high energy density, has been promoted. Among them, secondary batteries (so-called lithium-ion secondary batteries) that utilize lithium insertion and extraction for charge-discharge reactions are highly promising because they can achieve larger Energy Den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/36H01M2/02H01M10/40H01M4/13H01M4/48H01M4/62H01M4/70H01M10/052H01M10/0566H01M10/0567H01M10/0568H01M10/0569H01M50/119H01M50/121H01M50/129H01M50/133
CPCH01M4/134H01M4/364H01M4/366H01M4/483H01M4/64H01M10/052H01M10/0568H01M10/0569H01M2004/021H01M4/386Y02E60/10H01M50/133H01M50/121H01M50/129H01M50/119H01M4/02
Inventor 广瀬贵一川瀬贤一小西池勇仓泽俊佑岩间正之松元浩一
Owner MURATA MFG CO LTD
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