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Nonaqueous electrolyte secondary battery
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A secondary battery, electrolyte technology, applied in non-aqueous electrolyte storage battery, secondary battery, secondary battery repair/maintenance and other directions, can solve the problem of not teaching the change of anode coating amount and so on
Inactive Publication Date: 2016-08-03
RICOH KK
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Problems solved by technology
However, these studies do not teach the experimental results of changes in the coating amount of the anode and its effect
Method used
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Embodiment 1
[0198] The following graphite particles were prepared. The graphite particles are artificial graphite, and are spherical graphitized particles formed by calcining mesocarbon at 2,800° C. for graphitization.
[0199] Analysis of graphite particles was performed in the following manner.
[0200] (1) By means of a specific surface area measuring device (Gemini 2375, manufactured by Shimadzu Corporation), the BET specific surface area of graphite particles was measured. As for the adsorbent, nitrogen was used, and the adsorption temperature was set to 77K.
[0201] (2) With the help of a Raman spectrometer (laser Raman spectrometer NRS-3100, manufactured by JASCO Corporation), determine the 1,360cm in the Raman spectrum -1 The peak intensity at 1,580cm -1 The peak intensity ratio of the peak intensity at is I(1360) / I(1580).
[0202] The BET specific surface area of graphite particles is 10m 2 / g to 300m 2 / g, the peak intensity ratio (IB / IA) is 0.3 or greater—that is, th...
Embodiment 2
[0231] A battery was produced in the same manner as in Example 1, provided that the weight ratio of the cathode and anode was changed to a weight ratio (anode / cathode) of 0.4, where the cathode was 8.4 mg / cm 2 , the anode is 3.4mg / cm 2 , and measure the cycle characteristics up to the overcharged region. As a result, the discharge capacity is 24mAh / g, as Figure 4 shown in . In this case, the SOC can be set to 24mAh / g, and the overcharge area can be set to 24mAh / g or more.
[0232] Such as Figure 4 As shown by the bottom line of , the battery does not deteriorate for the first 21 cycles, but its charge capacity drops at the 22nd cycle.
Embodiment 3
[0234] A non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1, provided that the electrolyte changed to dissolve 1M LiBF 4 PC.
[0235] A voltage reaching the overcharge region was applied to the secondary battery, but the secondary battery did not deteriorate for the first 21 cycles.
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Abstract
A nonaqueous electrolyte secondary battery, which contains: an anode capable of accumulating or releasing metal lithium, or a lithium ion, or both; a cathode relative to the anode; and a nonaqueous electrolyte, in which a lithium salt is dissolved in a nonaqueous solvent, wherein, after repeating charge of the nonaqueous electrolyte secondary battery to an overcharge region and discharge for the charge 20 times, a charge capacity of the nonaqueous electrolyte secondary battery for 21st charge is a capacity equal to or greater than 100% SOC (State of Charge), where 100% SOC is an arbitrary capacity indicating that electric potential of the anode is reduced by 5% or greater based on a relative value, compared to electric potential thereof when SOC is 0%.
Description
technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery. Background technique [0002] Research and development on non-aqueous electrolyte secondary batteries having high energy density has been carried out as electric appliances reduce their weight and size in recent years. In addition, as the field of application thereof expands, improvement in battery performance of non-aqueous electrolyte secondary batteries is required. [0003] A nonaqueous electrolyte secondary battery is at least composed of a cathode, an anode, and a nonaqueous electrolyte (in which lithium salt is dissolved in a nonaqueous solvent). As for the anode, metals, metal compounds (including oxides and lithium alloys) or carbonaceous materials capable of accumulating and releasing metallic lithium or lithium ions are used. As for the carbonaceous material, for example, coke, artificial graphite, and natural graphite are proposed. In this nonaqueous electrolyt...
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