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Lithium primary battery and method for producing the same

A battery and lithium alloy technology, applied in the field of lithium primary batteries, can solve problems such as separation

Active Publication Date: 2009-07-15
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if a film or layer is formed for the surface modification of the negative electrode, they are separated at the time of discharge
Therefore, basically no attempt has been made to apply the surface modification technology in lithium secondary battery anodes to primary batteries

Method used

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  • Lithium primary battery and method for producing the same
  • Lithium primary battery and method for producing the same
  • Lithium primary battery and method for producing the same

Examples

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Effect test

preparation example Construction

[0096] An example of the production method of the negative electrode of the coin cell is given in detail. In an argon glove box, dry carbon black was sprayed on a lithium metal sheet and the sheet was heated to approximately 200°C with a hot plate. At this time, carbon black is impregnated with molten lithium to form a composite of carbon black and lithium. Alternatively, carbon black can be sandwiched between a pair of lithium metal sheets and heated to about 200°C. Heating is preferably performed under a reduced pressure of 100 Pa or less to accelerate the impregnation of carbon black with molten lithium. In addition, a molten mixture was prepared by heating lithium flakes and carbon black powder, and stirring them in an inert atmosphere to accelerate homogeneous mixing.

[0097] Then, the composite of lithium and carbon black was pressed into a sheet using a small roller press installed in an inert atmosphere, and the thickness of the sheet was made uniform. When the thi...

Embodiment 1A

[0123] (i) Preparation of positive electrode

[0124]For the positive electrode active material, petroleum coke was fluorinated and used as fluorinated graphite. Fluorinated graphite, acetylene black (conductive material) and styrene-butadiene rubber (SBR) (binder) were mixed at a solid content weight ratio of 100:15:6, and a mixed solution of water and ethanol was used as a dispersion medium Knead them well. After the resulting mixture was dried at 100° C., the mixture was compression-molded into a disc shape by using a predetermined mold and a hydraulic press, thereby obtaining a positive electrode.

[0125] (ii) Preparation of negative electrode

[0126] Lithium metal was used as the negative electrode active material, and acetylene black (AB) prepared by Denki Kagaku KogyoKabushiki Kaisha was used as the amorphous carbon material. The average particle size of the primary particles of acetylene black is 0.04 μm, and the BET specific surface area is 60m 2 / g. The acetyl...

Embodiment 2A

[0133] A negative electrode was prepared in the same manner as in Example 1A, except that the negative electrode preparation atmosphere was changed to an airtight container with a vacuum degree of 100 Pa or less. Prepare 10 coin cells.

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Abstract

Disclosed is a lithium primary battery comprising a positive electrode, a negative electrode, an organic electrolyte solution and a separator interposed between the positive electrode and the negative electrode. The negative electrode contains a negative electrode active material, and the negative electrode active material is composed of at least one substance selected from the group consisting of lithium metal and lithium alloys. At least the surface layer of the negative electrode is composed of a composite material of an amorphous carbon material and the negative electrode active material, and the surface layer is arranged opposite to the positive electrode via the separator. Such a lithium primary battery is highly reliable and excellent in large current discharge characteristics at low temperatures and storage stability at high temperatures.

Description

technical field [0001] The present invention relates to a lithium primary battery comprising a negative electrode comprising at least one selected from lithium metal and lithium alloy as a negative electrode active material and particularly relates to large current discharge performance at low temperature and storage characteristics at high temperature Lithium primary batteries excellent in at least one aspect. Background technique [0002] Since a lithium primary battery using lithium metal or its alloy as an anode active material has high voltage and high energy density compared with a conventional aqueous solution type battery, size reduction and weight reduction are easily achieved. Therefore, lithium primary batteries are used for many purposes such as a main power source for small electronic devices and as a backup power source. [0003] For positive electrode active materials of lithium primary batteries, metal oxides such as manganese dioxide and graphite fluoride a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/06H01M6/16H01M4/62
Inventor 森垣健一山中晋人见徹藤井慎二池畠敏彦
Owner PANASONIC CORP
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