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Non-aqueous electrolyte rechargeable battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte storage batteries, secondary batteries, secondary battery manufacturing and other directions, can solve the problem of sacrificing the high capacity characteristics of SiO

Active Publication Date: 2006-11-22
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, if the discharge potential is limited as in Patent Document 1, since the average discharge potential of SiO relative to the Li electrode is 0.4V to 0.5V, only about half of the intrinsic capacity of SiO can be utilized, thus sacrificing the inherent high capacity characteristics of SiO

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] In this example, negative electrodes and cylindrical batteries were produced in the following manner, and their cycle life and discharge capacity were evaluated.

[0061] (1) Production of negative electrodes

[0062] Negative pole (i)

[0063] A graphite crucible and an electron gun in which Si metal (purity 99.999%, Furuuchi Chemical Corporation, ingot) were placed were placed in a vapor deposition apparatus. An electrolytic copper foil (20 μm thick, available from Furukawa Circuit Foil Co., Ltd.) used as a current collector sheet was fed from a roll to a vapor deposition apparatus at a constant speed (5 cm / min) so that Si deposited on the copper foil surface. The deposition conditions were set at an accelerating voltage of -8 kV and a current of 150 mA. The vacuum degree in the device is set to 3×10 when performing the following vapor deposition -5 Torr, unless otherwise specified.

[0064] After completion of deposition on one side of the current collector sheet,...

Embodiment 2

[0112] In this example, the acid content of the non-aqueous electrolyte was investigated. Using the negative electrode of Battery 9, a cylindrical lithium ion secondary battery was produced in the same manner as in Example 1. More specifically, Batteries 20 to 25 were produced by changing the drying conditions of the negative electrode (ii) (vacuum drying at 190° C. for 12 hours) as shown in Table 2. Table 2 presents the measured electrolyte acid content and battery characteristics.

[0113]

negative pole

drying conditions

Electrolyte

acid content

(ppm)

discharge capacity

(mAh)

storage period

negative potential

(V, relative to

Li / Li + )

recovery rate

(%)

after 100 cycles

Capacity retention

(%)

battery 20

Negative pole (ii)

Dew point is -60°C or

lower dry

Atmosp...

Embodiment 3

[0118] In this example, the influence of impurities contained in the negative electrode was investigated. The preparation method of the negative electrode active material used in the present embodiment is the same as that in the negative electrode (ii), except that the balls used in the mechanical manufacturing alloy are made of S45C steel (Fe-0.45%C steel) instead of stainless steel, Increase the operating time to 80 hours, 100 hours or 150 hours. The obtained alloy has a wide particle size distribution of 0.5 μm to 80 μm. These were sieved with a sieve (10 μm or less) to obtain an alloy material having a maximum particle size of 8 μm and an average particle size of 5 μm. The alloy powders thus obtained are referred to as alloy "b", alloy "c" and alloy "d".

[0119] The impurities of these alloys "b"~"d" were measured by ICP spectrometer, and it was found that transition metal elements other than Fe were lower than the lower limit of measurement. The Fe content is 680p...

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Abstract

The invention discloses a non-aqueous electrolyte secondary battery, which comprises: a positive pole, a negative pole and a non-aqueous electrolyte. The negative electrode includes a negative electrode active material containing at least Si. The nonaqueous electrolyte includes lithium hexafluorophosphate as a main supporting electrolyte, and has an acid content of not less than 50 ppm and not more than 200 ppm. The negative electrode has a potential of not lower than 0.6V and not higher than 1.5V with respect to the Li electrode at the end-of-discharge voltage of the battery. The battery can avoid the reduction of storage characteristics caused by the dissolution reaction of Si on the negative electrode and the precipitation reaction of dissolved Si during charging.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery, and particularly to a nonaqueous electrolyte secondary battery including a preferred negative electrode and a nonaqueous electrolyte. Background technique [0002] Lithium metal can achieve high voltage and high energy density, and the use of lithium metal as the negative electrode of nonaqueous electrolyte secondary batteries has been extensively researched and developed. This development has led to the commercialization of lithium-ion batteries using graphite materials in the negative electrode, which can reversibly absorb and desorb lithium, and have excellent cycle life and safety. [0003] However, the effective capacity of the battery using the negative electrode based on graphite material is about 350mAh / g, which is very close to the theoretical capacity (372mAh / g) of graphite material. Therefore, as long as graphite material is used in the nega...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/134H01M4/36H01M4/38H01M4/485H01M10/04H01M10/052H01M10/0567H01M10/0568
CPCY02E60/10Y02P70/50
Inventor 佐藤俊忠美藤靖彦宇贺治正弥
Owner PANASONIC CORP
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