Material of negative electrode for lithium secondary battery, negative electrode utilizing the material, lithium secondary battery utilizing the negative electrode, and process for producing the mater

A technology of lithium secondary battery and negative electrode material, applied in the direction of secondary battery, battery electrode, lithium storage battery, etc., can solve the problem of unrealistic, large amount of lithium metal, etc.

Active Publication Date: 2007-04-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if such a method is to be used to solve the above problems, a very large amount of lithium metal is required, so it is not practical

Method used

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  • Material of negative electrode for lithium secondary battery, negative electrode utilizing the material, lithium secondary battery utilizing the negative electrode, and process for producing the mater
  • Material of negative electrode for lithium secondary battery, negative electrode utilizing the material, lithium secondary battery utilizing the negative electrode, and process for producing the mater
  • Material of negative electrode for lithium secondary battery, negative electrode utilizing the material, lithium secondary battery utilizing the negative electrode, and process for producing the mater

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Embodiment approach 1

[0060] Hereinafter, the effects of the present invention will be described using specific examples. First, Embodiment 1 of the present invention using the prismatic battery shown in FIG. 3 will be described. First, the production of sample LE1 will be described.

[0061] The negative electrode material was synthesized as follows. The silicon powder was mixed with the titanium powder so that the molar ratio of the elements was 94.4:5.6. 1.2 kg of the mixed powder and 300 kg of stainless steel balls with a diameter of 1 inch were put into a vibratory ball mill device. Thereafter, the inside of the apparatus was replaced with argon gas, and pulverization treatment was performed for 60 hours at an amplitude of 8 mm and a vibration frequency of 1200 rpm. In this way, base material particles 1 composed of Si—Ti (phase B) and Si (phase A) were obtained. When the base material particle 1 was observed by TEM, it was confirmed that crystallites of 50 nm or less accounted for 80% or ...

Embodiment approach 2

[0083] In Embodiment 2 of the present invention, the structure of the coin type battery shown in FIG. 4 and the result of examination will be described. First, the manufacturing process of sample CE1 is demonstrated.

[0084] The negative electrode 7A was fabricated as follows. The negative electrode material obtained by the same method as sample LE4 of Embodiment 1, AB as a conductive agent, and PAA as a binder were mixed at a weight ratio of solid components of 82:20:10 to prepare an electrode mixture. This electrode mixture was shaped into pellets with a diameter of 4 mm and a thickness of 0.3 mm, and dried at 200° C. for 12 hours. In this way, negative electrode 7A was obtained. In order to maintain the slowly oxidized state of the base material particles 1, the above-mentioned negative electrode 7A was produced in an argon atmosphere.

[0085] Next, the manufacturing process of the positive electrode 5A will be described. Manganese dioxide and lithium hydroxide were ...

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Abstract

A material of negative electrode for lithium secondary battery, comprising base material particles having either an A-phase composed mainly of silicon or a mixed phase of the A-phase and a B-phase consisting of an intermetallic compound of transition metal element and silicon, wherein the A-phase and mixed phase are microcrystalline or amorphous, and wherein a carbon material adheres to part of the surface of the base material particles while the rest of the surface is coated with a film containing silicon oxide. The lithium secondary battery having this material of negative electrode for lithium secondary battery applied thereto excels in charge discharge cycle characteristics, being reduced in irreversible capacity, and has a capacity strikingly higher than that of the lithium secondary battery utilizing conventional carbon material in the negative electrode material.

Description

technical field [0001] The present invention relates to a negative electrode material for a lithium secondary battery, a manufacturing method thereof, a negative electrode using the negative electrode material, and a lithium secondary battery using the negative electrode. Background technique [0002] In recent years, lithium secondary batteries, which have been used as main power sources for mobile communication devices and portable electronic devices, have the characteristics of high electromotive force and high energy density. Currently, as an anode material that can replace lithium metal, a battery using a carbon material that can intercalate and deintercalate lithium ions has reached practical use. However, there is a limit to the amount of lithium ions that can be intercalated in carbon materials represented by graphite, and its theoretical capacity is 372 mAh / g, which is about 10% of the theoretical capacity of lithium metal. [0003] Therefore, in order to increase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/40H01M4/02C01B33/06H01M4/13H01M4/58H01M4/587H01M10/052H01M10/36
CPCC01G45/1228Y02E60/122H01M4/625H01M4/13H01M10/052C01P2006/40C01G45/1292H01M4/38C01G51/42H01M4/587H01M4/366C01G45/1221H01M4/386Y02E60/10Y10T29/49108
Inventor 山本辉明佐藤俊忠美藤靖彦
Owner PANASONIC CORP
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