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Non-aqueous solvent, non-aqueous electrolyte compositions, and non-aqueous electrolyte secondary battery

A non-aqueous solvent and composition technology, which is applied in the field of lithium ion non-aqueous electrolyte secondary batteries, can solve the problems of deterioration of battery performance and reduction of discharge capacity retention ratio.

Inactive Publication Date: 2007-09-12
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Thus, there are problems such as a great deterioration in battery performance and a decrease in the discharge capacity retention ratio when charging and discharging are repeated

Method used

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  • Non-aqueous solvent, non-aqueous electrolyte compositions, and non-aqueous electrolyte secondary battery
  • Non-aqueous solvent, non-aqueous electrolyte compositions, and non-aqueous electrolyte secondary battery
  • Non-aqueous solvent, non-aqueous electrolyte compositions, and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] First, 94 parts by weight of lithium cobalt composite oxide (LiCoO 2 ), 3 parts by weight of graphite as a conductive material and 3 parts by weight of polyvinylidene fluoride (PVdF) as a binder are mixed uniformly and N-methylpyrrolidone is added to obtain a cathode mixture coating solution.

[0099] Subsequently, both surfaces of the aluminum foil with a thickness of 20 μm were uniformly coated with the obtained cathode mixture coating solution, and the cathode mixture coating solution was dried to obtain 40 mg / cm per surface. 2 The cathode mixture layer. The cathode mixture layer was cut into a shape having a width of 50 mm and a length of 300 mm, thereby forming a cathode. Further connect the cathode terminal.

[0100] Subsequently, 97 parts by weight of graphite as an anode active material and 3 parts by weight of PVdF as a binder were uniformly mixed and N-methylpyrrolidone was added, thereby obtaining an anode mixture coating solution. After that, both surfaces of a ...

Embodiment 2 to 31

[0106] Repeat the operation similar to Example 1, except that the mixing ratio of ethylene carbonate, propylene carbonate and diethyl carbonate and the addition amount of vinylene carbonate are limited in the ratio shown in Table 1, thereby obtaining Examples 2 to 31 laminated battery. The change in discharge capacity was measured in a similar way as described above, and the results obtained are shown in Table 1.

[0107] From Table 1, it can be seen that the use of a non-aqueous electrolyte composition containing ethylene carbonate, propylene carbonate, and diethyl carbonate in a predetermined range ratio and a non-aqueous electrolyte composition using a predetermined range of vinylene carbonate is used in comparison with each group therein. The discharge / charge capacity retention ratio after 100 cycles is improved compared with the comparative example in which the content of the components is not within the predetermined range.

Embodiment 32-41

[0109] Repeat the operation similar to Example 1, except that the mixing ratio of ethylene carbonate, propylene carbonate and diethyl carbonate and the addition amount of vinyl ethylene carbonate (VEC) are defined in the ratio shown in Table 1, so as to obtain The laminated batteries of Examples 32-41. The change in discharge capacity was measured in a similar manner as described above, and the results obtained are shown in Table 1.

[0110] It can be seen from Table 1 that by using a non-aqueous solvent containing ethylene carbonate, propylene carbonate, and diethyl carbonate in a predetermined ratio range, and using a non-aqueous electrolysis method to add vinyl ethylene carbonate in a predetermined range Compared with the comparative example in which the content of each component is not within the predetermined range of the liquid composition, the charge / discharge capacity retention ratio after the completion of 100 cycles is improved.

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PUM

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Abstract

A non-aqueous solvent is provided that includes ethylene carbonate in a range from 5% or more to less than 60%, propylene carbonate of 40% or less, and diethyl carbonate of 40% or more, as mass ratios. The non-aqueous electrolyte compositions are formed by further adding an electrolytic salt and, if necessary, unsaturated cyclic carbonic ester and a high molecular compound into the non-aqueous solvent. A non-aqueous electrolyte secondary battery is formed by using the non-aqueous electrolyte compositions.

Description

[0001] Cross-references to related applications [0002] The present invention includes the subject matter related to the Japanese Patent Application JP2006-026115 filed with the Japan Patent Office on February 2, 2006, the entire content of which is incorporated herein by reference. Technical field [0003] The present invention relates to a non-aqueous solvent, an electrolyte composition using the non-aqueous solvent, and a non-aqueous electrolyte secondary battery. More specifically, the present invention relates to a non-aqueous solvent containing ethylene carbonate, propylene carbonate, and diethyl carbonate, a non-aqueous electrolyte composition containing the non-aqueous solvent and an electrolytic salt, and a combination using the non-aqueous electrolyte Lithium-ion non-aqueous electrolyte secondary battery. Background technique [0004] In recent years, many portable electronic devices such as camera-integrated VTR (Video Tape Recorder), digital cameras, portable phones, ...

Claims

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Application Information

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IPC IPC(8): H01M10/40C08L29/04C08L33/08C08L27/16H01M2/02H01M10/05H01M10/052H01M10/0565H01M10/0567H01M10/0569
CPCY02E60/12Y02E60/122H01M10/0567H01M10/0569H01M10/0587Y02E60/10A41D25/003A44B6/00
Inventor 竹田幸史
Owner SONY CORP
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