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Alloy for negative electrode of lithium secondary battery

A lithium secondary battery and alloy technology, applied in secondary batteries, lithium batteries, battery electrodes, etc., can solve the problems of increasing internal resistance and achieve the effects of large charge and discharge capacity and good charge and discharge cycle characteristics

Inactive Publication Date: 2008-07-30
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These nubs isolate electrical contact between non-carbon materials, thereby increasing internal resistance

Method used

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  • Alloy for negative electrode of lithium secondary battery
  • Alloy for negative electrode of lithium secondary battery
  • Alloy for negative electrode of lithium secondary battery

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[0129] Into a crucible comprising a double-layer structure of carbon and alumina, 210 g of tin metal (2N {99% purity}), 455 g of silicon metal (4N {99.99% purity}) and 35 g of electrolytic copper were added, followed by It was heated at 1400° C. in the presence of argon in a frequency induction furnace to prepare a melt. With the equipment for the strip casting method comprising the units shown in FIGS. with cast alloy. A cooling roll made of copper was rotated at a peripheral speed of 1.0 m / sec, the thickness of the strip cast alloy was 300 μm, and the cooling rate from the melt temperature to 600° C. was 3000° C. / sec.

[0130] The resulting strip cast alloy was ground into a powder in an alumina mortar for analysis by X-ray diffraction. Diffraction peaks corresponding to Sn metal and Si metal were identified, respectively. A close-up cross section of the alloy with a scanning electron microscope (S-530 produced by Hitachi High-Technologies Co.) showed two phases, a phase ...

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Abstract

At least two metallic materials containing element such as silicon and tin, which has ability of insertion and desertion of lithium element, and optionally another metallic material containing element such as copper are molten to prepare a melt. The melt is rapidly cooled by strip-cast method at a cooling rate of more than 2x103 ° C. / sec and no more than 104 ° C. / sec to be cast. Further, the cast is milled and classified into alloy powder having an average particle size of 0.1 mum to 50 mum. The alloy powder and conductive agent are laminated with binder onto a collector to obtain a negative electrode for a secondary battery. The negative electrode is employed to obtain a lithium secondary battery having high electric charge and discharge capacity, and good property of charge and discharge cycle.

Description

technical field [0001] The present invention relates to an alloy for a negative electrode of a lithium secondary battery, a method for producing a lithium-insertable alloy, and a lithium secondary battery using the same, the lithium secondary battery having a large charge-discharge capacity and good charge-discharge cycle characteristics. Background technique [0002] Lithium secondary batteries are widely used as high-energy-density batteries for mobile electronic devices and the like. In order to prolong the operating time of mobile electronic devices, the development of energy-saving electronic components has been going on, but the development of multi-functions is faster than the development of energy saving, which increases the power consumption, making it difficult to extend the operating time. [0003] In order to simultaneously meet the requirements of long operation time and multi-function of mobile electronic devices, secondary batteries require high electrical cap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/02H01M10/40H01M4/134H01M4/1395
CPCY02E60/122B22F2009/041H01M10/052H01M4/02B22F2998/10C22C32/0084H01M4/134B22F2009/048H01M2004/021H01M4/405H01M4/38H01M4/386H01M4/387Y02E60/10H01M2004/027
Inventor 中岛健一朗武内正隆
Owner SHOWA DENKO KK
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