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Anode and secondary battery

A negative electrode current collector and negative electrode technology, applied in the direction of secondary batteries, batteries, lithium storage batteries, etc., can solve the problems of easy passivation of lithium, easy decomposition of electrolyte, and reduction of cycle characteristics, an important characteristic of secondary batteries, to achieve improved Cyclic characteristics, good effect of the effect

Active Publication Date: 2014-04-16
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the negative electrode active material is highly active, so the electrolyte is easily decomposed during charge and discharge, and lithium is easily passivated.
Therefore, while the secondary battery obtains a higher capacity, the important characteristic of the secondary battery—the cycle characteristic is easy to decrease.

Method used

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  • Anode and secondary battery
  • Anode and secondary battery
  • Anode and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0142] Prepared by the following steps Figure 9 and 10 A secondary battery of the laminated film type shown in . 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 in terms of intercalation and deintercalation of lithium.

[0143] First, the positive electrode 53 is formed. 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 a positive electrode active material, 6 parts by weight of graphite as a conductive agent, and 3 parts by weight of polyvinylidene fluoride as a binder to form a positive electrode mixture, the positive electrode The mixture is dispersed in N-methyl-2-pyrrolidone to form a paste-like positive electrode mixture slurry. Finally, the positive electrode mixtu...

Embodiment 1-2 to 1-14

[0149] Form the secondary battery by the same steps as in Example 1-1, the difference is that the volume of the group of small pores per unit weight of silicon is not 0.2 cm 3 / g, but 0.1cm 3 / g (Example 1-2), 0.09cm 3 / g (embodiment 1-3), 0.08cm 3 / g (Example 1-4), 0.07cm 3 / g (embodiment 1-5), 0.06cm 3 / g (embodiment 1-6), 0.05cm 3 / g (Example 1-7), 0.04cm 3 / g (Example 1-8), 0.03cm 3 / g (Example 1-9), 0.02cm 3 / g (Example 1-10), 0.01cm 3 / g (embodiment 1-11), 0.005cm 3 / g (Example 1-12), 0.001cm 3 / g (Example 1-13), or 0cm 3 / g (Example 1-14).

Embodiment 2-1 to 2-9

[0164] Form the secondary battery by the same steps as in Examples 1-1, 1-2, 1-4, 1-7 and 1-10 to 1-14, the difference is that when the negative electrode current collector 54A is relative to the evaporation source While moving back and forth, silicon is deposited six times to perform lamination, so that the negative electrode active material has a six-layer structure. At this time, the deposition rate was 100 nm / s.

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Abstract

A secondary battery is provided to improve the cycleability. An anode comprises an anode collector and an anode active material layer formed in the anode collector. The anode active material layer comprises an anode active material which contains silicon (Si) and has a pore group with a diameter ranging from 3 nm to 50 nm both inclusive, and the volumetric capacity per unit weight of silicon of the pore group with a diameter ranging from 3 nm to 50 nm both inclusive is 0.2 cm3 / g or less, the volumetric capacity being measured by mercury porosimetry using a mercury porosimeter.

Description

[0001] This application is a divisional application of the invention patent application with the application number 200810109884.9 and the invention title: "Negative electrode and secondary battery" submitted to the State Intellectual Property Office of China on June 5, 2008. [0002] Related Application Cross Reference [0003] The present invention contains subject matter of the following Japanese Patent Applications, namely JP2007-149253 and JP2008-015253 filed in Japan Patent Office on Jun. 5, 2007 and Jan. 25, 2008, the entire contents of which are incorporated herein by reference. technical field [0004] 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 secondary battery including the negative electrode. Background technique [0005] In recent years, portable electronic devices such as camera-integrated VTRs (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/38H01M10/05B82Y99/00H01M2/02H01M4/13H01M4/134H01M4/139H01M4/1395H01M4/36H01M4/48H01M4/70H01M10/052H01M10/0525H01M10/0566H01M10/0568H01M10/0569
CPCY02E60/12Y02E60/122H01M4/134H01M4/386H01M10/0525Y02E60/10H01M4/0404H01M4/045H01M4/049H01M2004/021H01M2220/30
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