WO2002001665A1 - Electrolyte non aqueux et cellule secondaire de celui-ci - Google Patents
Electrolyte non aqueux et cellule secondaire de celui-ci Download PDFInfo
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- WO2002001665A1 WO2002001665A1 PCT/JP2001/004924 JP0104924W WO0201665A1 WO 2002001665 A1 WO2002001665 A1 WO 2002001665A1 JP 0104924 W JP0104924 W JP 0104924W WO 0201665 A1 WO0201665 A1 WO 0201665A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0569—Liquid materials characterised by the solvents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
- H01M6/16—Cells with non-aqueous electrolyte with organic electrolyte
- H01M6/162—Cells with non-aqueous electrolyte with organic electrolyte characterised by the electrolyte
- H01M6/168—Cells with non-aqueous electrolyte with organic electrolyte characterised by the electrolyte by additives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a non-aqueous electrolyte which provides a non-aqueous electrolyte secondary battery which is excellent in cycle characteristics, capacity retention rate and storage characteristics and has a reduced amount of gas generated during high-temperature storage, and a secondary battery using the same.
- a non-aqueous electrolyte which provides a non-aqueous electrolyte secondary battery which is excellent in cycle characteristics, capacity retention rate and storage characteristics and has a reduced amount of gas generated during high-temperature storage, and a secondary battery using the same.
- non-aqueous electrolyte secondary batteries such as lithium ion secondary batteries and lithium polymer primary batteries, have high voltage, high energy density, and can be made thinner. Is being done.
- various lithium-containing composite oxides capable of inserting and extracting lithium by charge and discharge are generally used as an active material.
- the negative electrodes of nonaqueous electrolyte secondary batteries include those containing metallic lithium as an active material and those containing metallic compounds or carbon materials capable of inserting and extracting lithium by charging and discharging. .
- carbon materials are often used for negative electrodes.
- an SEI (Solid Electrolyte Interface) film is formed on the surface of a negative electrode using a carbon material by the reaction between the electrolyte and the negative electrode, and the film maintains the chemical stability of the negative electrode.
- the film is apt to crack, and the anode reacts with the non-aqueous solvent in the electrolyte at the crack to generate gas.
- a bag-shaped exterior material consisting of a laminated sheet with metal foil disposed between resin films is used. Often used. In this case, even when a small amount of gas is generated, there is a problem that the battery thickness increases, the liquid leaks, and the charge / discharge characteristics deteriorate due to the increase in the battery internal pressure.
- the binder contained in the positive electrode and the negative electrode swells with the electrolytic solution during the charge / discharge cycle and storage of the battery, so that the impedance of each electrode increases and the battery capacity gradually decreases. Disclosure of the invention
- the present invention provides a non-aqueous electrolyte which provides a non-aqueous electrolyte secondary battery which is excellent in cycle characteristics, capacity retention rate and storage characteristics, and has a reduced amount of gas generated during high-temperature storage.
- the purpose of the present invention is to provide a non-aqueous electrolyte secondary battery.
- the present invention relates to a non-aqueous electrolyte comprising a non-aqueous solvent and a solute dissolved in the non-aqueous solvent, and comprising pyrene carbonate and 1,3-propane sultone as additives.
- the non-aqueous electrolytic solution contains 0.1 to 5.0 parts by weight of propylene carbonate and 0.1 to 6.5 parts by weight of 1,3-propane per 100 parts by weight of the non-aqueous solvent. Contains sultone Is preferred.
- the non-aqueous electrolyte further comprises at least one selected from the group consisting of vinylene carbonate, diphenyl disulfide, di-p-tolyl disulfide, and bis (4-methoxyphenyl) disulfide. It is preferable to include as.
- the present invention also comprises a non-aqueous solvent and a solute dissolved in the non-aqueous solvent, wherein the non-aqueous solvent has 0.1 to 5.0 parts by weight of propylene force per 100 parts by weight of propylene glycol. 1 to 6.5 parts by weight of 1,3_propane sultone as an additive, and 0.1 to 5.0 parts by weight of pinylene carbonate or 100 parts by weight of the nonaqueous solvent.
- the present invention also includes a non-aqueous solvent and a solute dissolved in the non-aqueous solvent, wherein 0.1 to 5.0 parts by weight of propylene carbonate and 0.1 part by weight per 100 parts by weight of the non-aqueous solvent. 0.1 to 6.5 parts by weight of 1,3-propane sultone as an additive, and 0.1 to 5.0 parts by weight of vinylene carbonate per 100 parts by weight of the non-aqueous solvent, and a total amount of 0 to 6.5 parts by weight. :!
- diphenyldisulfide di-p-tolyldisulfide and bis (4-methoxyphenyl) disulfide each containing at least one selected from the group consisting of Regarding water electrolyte.
- it is selected from the group consisting of propylene carbonate, 1,3-propane sultone, vinylene carbonate, diphenyl disulfide, di-p-tolyl disulfide and bis (4-methoxyphenyl) disulfide.
- the total amount of at least one kind is preferably 0.4 to 17.1 parts by weight per 100 parts by weight of the nonaqueous solvent.
- the present invention also provides a non-aqueous solvent and a solute dissolved in the non-aqueous solvent.
- a non-aqueous electrolyte containing at least one selected from the group consisting of vinylene carbonate, diphenyl disulfide, di-P-tolyl disulfide and bis (4-methoxyphenyl) disulfide as additives.
- the non-aqueous electrolyte is composed of 0.1 to 5.0 parts by weight of vinylene carbonate and 0.1 to 0.6 parts by weight of diphene per 100 parts by weight of the non-aqueous solvent. It preferably contains at least one member selected from the group consisting of rudisulfide, g-p-tolyl disulfide and bis (4-methoxyphenyl) disulfide.
- the non-aqueous solvent used in the present invention preferably comprises 10 to 70% by weight of a cyclic carbonate and 30 to 90% by weight of a chain carbonate.
- the cyclic carbonate is preferably made of at least one selected from the group consisting of ethylene carbonate, propylene carbonate and butylene carbonate.
- the chain carbonate is at least one selected from the group consisting of dimethyl carbonate, getyl carbonate and ethyl methyl carbonate.
- 1,3-propane sultone, vinylene carbonate, diphenyl disulfide, di-p-tolyl disulfide and bis (.4-methoxyphenyl) disulfide are all used as additives. Can be Therefore, these additives are not included in the non-aqueous solvent.
- propylene carbonate may be treated as an additive or as a non-aqueous solvent. When 10% by weight or more of the non-aqueous solvent in the non-aqueous electrolyte is composed of propylene carbonate, propylene carbonate is not treated as an additive.
- propylene carbonate is treated as a non-aqueous solvent and 1,3-propane sultone, vinylene carbonate, diphenyl disulphide, di-p-tolyl disulphide and bis (4 -Methoxyphenyl) Only disulfide is used as an additive. That is, propylene carbonate exerts its effect as an additive only when propylene carbonate is not the main component of the non-aqueous solvent.
- the present invention further relates to a secondary battery comprising a positive electrode containing a lithium-containing composite metal oxide, a negative electrode containing graphite, and any one of the above non-aqueous electrolytes.
- At least one of the positive electrode and the negative electrode preferably contains a fluorine resin as a binder.
- the fluororesin is preferably at least one selected from the group consisting of polyvinylidene fluoride, a copolymer of vinylidene fluoride and hexafluoropropylene, and polytetrafluoroethylene. .
- the graphite is natural graphite or artificial graphite, and it is preferable that the lattice distance (d 2) between lattice planes (002) is 3.350 to 3.400 angstroms.
- FIG. 1 is a front view showing the internal structures of the batteries manufactured in the examples of the present invention and the comparative examples by broken lines.
- FIG. 2 is a vertical cross-sectional view of the batteries manufactured in Examples of the present invention and Comparative Examples. BEST MODE FOR CARRYING OUT THE INVENTION
- the non-aqueous solvent used in the present invention preferably contains a cyclic carbonate and a chain carbonate as main components.
- the non-aqueous solvent preferably comprises 10 to 70% by weight of a cyclic carbonate and 30 to 90% by weight of a chain force.
- Preferred examples of the cyclic carbonate include ethylene carbonate, carbonate, propylene carbonate, and butylene carbonate. These may be used alone or in combination of two or more.
- propylene carbonate is treated as a cyclic carbonate of a non-aqueous solvent only when 10% by weight or more of the non-aqueous solvent in the non-aqueous electrolyte is made up of propylene-carbonate. .
- chain force carbonate for example, dimethyl carbonate, diethyl carbonate and ethyl methyl carbonate are preferable. These may be used alone or in combination of two or more.
- L i PF 6 by itself or other not preferable be used in combination with a solute.
- the non-aqueous electrolyte solution of the present invention is prepared by dissolving the solute in the non-aqueous solvent at a concentration of, for example, 0.5 to 1.5 mol / L, and then dissolving the additive. be able to.
- the materials other than the non-aqueous electrolyte constituting the non-aqueous electrolyte secondary battery of the present invention are not particularly limited. Conventionally used materials can be used.
- As the positive electrode material for example, a lithium-containing composite metal oxide that can release and occlude lithium ions by charging and discharging can be used.
- the lithium-containing composite metal oxide for example, L i X C o'0 2, L i xN i ⁇ 2, L i x Mn ⁇ 2 , L i xC o y N i i- y O 2 , L i X C o y Mi- y O z3 ⁇ 4
- L i xN i i-yMyO L i] 1 2 Rei_4 Oyobi i X M n 2 - y M y ⁇ 4 can be used. These may be used alone or in combination of two or more.
- the X value is a value before the start of charging / discharging, and increases / decreases due to charging / discharging.
- transition metal chalcogenides lithium compounds of vanadium oxides, and lithium compounds of niobium oxides can also be used.
- the average particle size of the positive electrode material is not particularly limited, but is preferably 1 to 30 / xm.
- the negative electrode material for example, a carbon material capable of inserting and extracting lithium ions by charging and discharging can be used.
- graphite having a graphite type crystal structure is preferable.
- spacing of lattice planes (0 0 2) (d .. 2) is
- a fluororesin is preferable.
- polyvinylidene fluoride a copolymer of vinylidene fluoride and hexafluoropropylene, and polytetrafluoroethylene. These may be used alone or in combination of two or more.
- propylene carbonate and 1,3-propane sultone added to the non-aqueous electrolyte contribute to the formation of a stable SEI film on the carbon material surface of the negative electrode.
- This film cracks even when the battery is stored at high temperature. There is no stable film.
- the negative electrode contains an active and highly crystalline carbon material such as natural graphite or artificial graphite, the carbon material is covered with this film, thereby suppressing the decomposition of the nonaqueous solvent during high-temperature storage. Gas generation can be suppressed.
- this film does not prevent the normal reaction of charging and discharging the battery.
- vinylene carbonate, diphenyl disulfide, di-p-tolyl disulfide and bis (4-methoxyphenyl) disulfide added to the non-aqueous electrolytic solution are used to form a stable SEI on the carbon material surface of the negative electrode. It contributes to film formation. This film is kept stable even when the battery is repeatedly charged and discharged. Moreover, this film does not prevent the normal reaction of charging and discharging the battery. By the action of this film, gas generation due to the electrochemical reduction of the non-aqueous solvent is suppressed.
- diphenyl disulfide, di-p-tolyl disulfide and bis (4-methoxyphenyl) disulfide form an SEI film containing a non-aqueous solvent and a carbon material, and the polarity of the binder of the negative electrode is reduced.
- swelling of the binder due to non-aqueous solvent is suppressed. Therefore, it is considered that the adhesion between the electrode material particles is maintained, the increase in the impedance of the electrode is suppressed, and the cycle characteristics are further improved.
- a microporous thin film having high ion permeability, predetermined mechanical strength, and insulating properties is used as the separator interposed between the positive electrode and the negative electrode.
- a thin film for example, a sheet, woven fabric or nonwoven fabric made of polyolefin glass fiber such as polypropylene or polyethylene having organic solvent resistance and hydrophobicity can be used.
- Port that absorbs and holds nonaqueous electrolyte A film made of a limer material is used.
- a polymer material that absorbs and retains the nonaqueous electrolyte may be included in at least one of the positive electrode mixture and the negative electrode mixture. Then, a membrane made of a polymer material holding the nonaqueous electrolyte is interposed between the positive electrode and the negative electrode, and these are integrated to obtain an electrode group of a lithium polymer battery.
- the polymer material that absorbs and retains the nonaqueous electrolyte for example, a copolymer of pinylidene fluoride and hexafluoropropylene is preferable.
- the pore size of the separator is preferably a size that does not allow the active material, the binder, and the conductive agent detached from the positive electrode plate and the negative electrode plate to pass therethrough, and is, for example, 0.01 to 1 lm.
- the thickness of the separation is generally 10 to 300 mm.
- the porosity is determined according to the ion permeability and the type and thickness of the material, and is generally 30 to 80%.
- the present invention is applicable to non-aqueous electrolyte secondary batteries such as coin type, button type, sheet type, cylindrical type, flat type, and rectangular type. Further, the present invention can be applied to, for example, a large-sized battery used for an electric vehicle.
- the nonaqueous electrolyte secondary battery of the present invention can be used, for example, in portable information terminals, portable electronic devices, motorcycles, electric vehicles, and hybrid vehicles, but is not limited thereto.
- the present invention will be described specifically based on examples.
- FIG. 1 is a front view of a lithium polymer secondary battery produced in each of the examples and comparative examples of the present invention.
- FIG. 2 is a cross-sectional view of the lithium polymer primary battery.
- FIGS. 1 and 2 A method for manufacturing a positive electrode plate and a negative electrode plate constituting the lithium polymer secondary battery and a method for manufacturing a battery will be described.
- a paste was prepared by mixing 4 parts by weight of the coalesced and 40 parts by weight of N-methyl-2-piperidone. This paste was applied to a lath-processed aluminum foil positive electrode current collector 1a, dried and rolled to form a positive electrode mixture layer 1b, whereby positive electrode plate 1 was obtained.
- the negative electrode plate 2 was inserted between the two obtained positive electrode plates 1 via a separator 3 made of a copolymer of vinylidene fluoride and hexafluoropropylene.
- the obtained laminate was pressurized while being heated to 80 ° C. and integrated to obtain electrode plates 4.
- lead mounting portions 1c and 2c were formed on the positive electrode current collector 1a and the negative electrode current collector 2a, respectively.
- a positive electrode lead 5 made of aluminum foil was welded to the lead mounting portion 1c, and a negative electrode lead 6 made of copper foil was welded to the lead mounting portion 2c.
- the electrode plate group 4 was accommodated in the bag-shaped exterior material 7. At that time, The lead 5 and the negative electrode lead 6 were pulled out of the exterior material 7. The leading ends of the leads were used as positive and negative input / output terminals 5a and 6a, respectively.
- Resin films 8 and 9 for securing electrical insulation and airtightness between the positive electrode lead 5 and the negative electrode lead 6 and the external material were arranged in the openings of the external material.
- the exterior member 7 is made of a laminate sheet including an aluminum foil, a polypropylene film disposed inside the aluminum foil, and a polyethylene terephthalate film and a nylon film disposed outside.
- the packaging material 7 was produced by cutting the laminate sheet into a band shape, folding the lamination into two pieces with the polypropylene film side inside, and welding the edges 7 of the two sides by heating in advance.
- Example 1 The preparation method of each non-aqueous electrolyte used in the lithium polymer secondary batteries produced in each of the examples and comparative examples is shown below.
- Example 1 The preparation method of each non-aqueous electrolyte used in the lithium polymer secondary batteries produced in each of the examples and comparative examples is shown below.
- EC ethylene carbonate
- EMC ethyl methyl carbonate
- DEC getylcarbonate
- PC propylene carbonate
- PS 1,3-propane sultone
- Example 2 In the same solvent mixture 1 0 0 parts by weight as in Example 1, 6. Add PS of 0 parts by weight, the non-aqueous electrolytic solution was further dissolved 1.3 of 5 m 0 I / L of L i PF 6 as a solute I got Example 2
- VC vinylene force
- DPDS diphenyldisulfide
- Example 4 To 100 parts by weight of the same mixed solvent as in Example 1, 0.5 parts by weight of VC and 0.1 parts by weight of di-p-tolyl disulfide (hereinafter, referred to as DTDS) were added, and as a solute, 1. 3 5MO 1 ZL dissolved L i PF 6 in to obtain a non-aqueous electrolyte solution.
- DTDS di-p-tolyl disulfide
- Example 5 To 100 parts by weight of the same mixed solvent as in Example 1, 0.5 parts by weight of VC and 0.1 parts by weight of bis (4-methoxyphenyl) disulphide (hereinafter referred to as BMP DS) were added. as 1.3 5 mo 1 Bruno dissolved L i PF 6 solute to give a non-aqueous electrolyte solution.
- BMP DS bis (4-methoxyphenyl) disulphide
- Example 6 1 0 0 parts by the same solvent mixture as in Example 1, 3. Add D PD S of VC and 0.4 parts by weight of 0 parts by weight, more L i PF of 1. 3 5mo l / L as a solute 6 was dissolved to obtain a non-aqueous electrolyte.
- Example 6
- Example 7 In the same solvent mixture 1 0 0 parts by weight as in Example 1, was added D TD S of VC and 0.4 parts by weight of 3.0 parts by weight, further L i PF 6 in 1. 3 5mo l ZL as a solute The non-aqueous electrolyte was obtained by dissolving.
- Example 7 In the same solvent mixture 1 0 0 parts by weight as in Example 1, was added D TD S of VC and 0.4 parts by weight of 3.0 parts by weight, further L i PF 6 in 1. 3 5mo l ZL as a solute The non-aqueous electrolyte was obtained by dissolving.
- Example 7 Example 7
- Example 8 In the same solvent mixture 1 0 0 parts by weight as in Example 1, was added to BMP DS of VC and 0.4 parts by weight of 3.0 parts by weight, further L i PF 6 in 1. 3 5 mo l ZL as a solute The non-aqueous electrolyte was obtained by dissolving.
- Example 8 In the same solvent mixture 1 0 0 parts by weight as in Example 1, was added to BMP DS of VC and 0.4 parts by weight of 3.0 parts by weight, further L i PF 6 in 1. 3 5 mo l ZL as a solute The non-aqueous electrolyte was obtained by dissolving.
- Example 8 Example 8
- Example 9 To 100 parts by weight of the same mixed solvent as in Example 1, 0.5 parts by weight of VC, 0.1 parts by weight of DPDS, and 0.1 parts by weight of BMP DS were added, and 1.3 parts as a solute were further added. Dissolve 5 mol ZL of Li PF 6 and use non-aqueous electrolyte I got Example 9
- Example 1.1 The D TD S of DPDS and 0.1 part by weight of 0.1 part by weight was added to obtain a non-aqueous electrolyte solution by dissolving a L i PF 6 in 1. 3 5mo l / L as a solute in further.
- Example 1.1 The D TD S of DPDS and 0.1 part by weight of 0.1 part by weight was added to obtain a non-aqueous electrolyte solution by dissolving a L i PF 6 in 1. 3 5mo l / L as a solute in further.
- Example 1.1 The D TD S of DPDS and 0.1 part by weight of 0.1 part by weight was added to obtain a non-aqueous electrolyte solution by dissolving a L i PF 6 in 1. 3 5mo l / L as a solute in further.
- Example 16 In the same solvent mixture 1 0 0 parts by weight as in Example 1, was added DPDS of 0.5 parts by weight, and further dissolving the L i PF 6 in 1. 3 5 mo 1 / L as a solute A non-aqueous electrolyte was obtained.
- Example 16 In the same solvent mixture 1 0 0 parts by weight as in Example 1, was added DPDS of 0.5 parts by weight, and further dissolving the L i PF 6 in 1. 3 5 mo 1 / L as a solute A non-aqueous electrolyte was obtained.
- Example 16 Example 16
- a non-aqueous electrolyte was obtained by adding 4.0 parts by weight of PS and 0.2 parts by weight of DPDS, and further dissolving 1.35 mo 1 L of Li PF 6 as a solute. 1 8
- Li i PF 6 was dissolved to obtain a non-aqueous electrolyte.
- Example 2.3 Li i PF 6 was dissolved to obtain a non-aqueous electrolyte.
- Example 2 7 100 parts by weight of the same mixed solvent as in Example 1, 2.0 parts by weight of PC, 4-0 parts by weight of PS, 0.8 parts by weight of VC, 0.2 parts by weight of DPDS and 0 parts by weight . the D TD S 2 parts by weight was added to obtain a non-aqueous electrolyte solution was further dissolved L i PF 6 in 1. 3 5 mo 1 / L as a solute.
- Example 2 7 100 parts by weight of the same mixed solvent as in Example 1, 2.0 parts by weight of PC, 4-0 parts by weight of PS, 0.8 parts by weight of VC, 0.2 parts by weight of DPDS and 0 parts by weight .
- the D TD S 2 parts by weight was added to obtain a non-aqueous electrolyte solution was further dissolved L i PF 6 in 1. 3 5 mo 1 / L as a solute.
- Example 2 7 100 parts by weight of the same mixed solvent as in Example 1, 2.0 parts by weight of PC, 4-0 parts by weight of PS, 0.8 parts
- Example 2 In 100 parts by weight of the same mixed solvent as in Example 1, 2.0 parts by weight of PC, 4.0 parts by weight of PS, 0.8 parts by weight of VC, 0.2 parts by weight of DPDS and 0.2 part by weight of was added BMP DS of parts, to obtain a non-aqueous electrolyte solution was further dissolved L i PF 6 in 1. 3 5 mo 1 ZL as a solute.
- Example 2 8 In 100 parts by weight of the same mixed solvent as in Example 1, 2.0 parts by weight of PC, 4.0 parts by weight of PS, 0.8 parts by weight of VC, 0.2 parts by weight of DPDS and 0.2 part by weight of was added BMP DS of parts, to obtain a non-aqueous electrolyte solution was further dissolved L i PF 6 in 1. 3 5 mo 1 ZL as a solute.
- Example 2 In 100 parts by weight of the same mixed solvent as in Example 1, 2.0 parts by weight of PC, 4.0 parts by weight of PS, 0.8 parts by weight of VC, 0.2 parts by weight of DTD S and 0.2 part by weight of DTD S. was added BMP DS of 2 parts by weight, to obtain a non-aqueous electrolyte solution was further dissolved L i PF 6 in 1. 3 5 mo 1 / L as a solute.
- Example 2 9 To 100 parts by weight of the same mixed solvent as in Example 1, 2.0 parts by weight of PC, 4.0 parts by weight of PS, 0.2 parts by weight of DPDS, and 0.2 parts by weight of
- Example 30 DTD S and 0.2 parts by weight of BMP DS were added, and 1.35 mo 1 ZL of Li PF 6 was dissolved as a solute to obtain a non-aqueous electrolyte.
- Example 30 DTD S and 0.2 parts by weight of BMP DS were added, and 1.35 mo 1 ZL of Li PF 6 was dissolved as a solute to obtain a non-aqueous electrolyte.
- Example 1 100 parts by weight of the same mixed solvent as in Example 1, 2.0 parts by weight of PC, 4.0 parts by weight of PS, 0.8 parts by weight of VC, 0.2 parts by weight of DPD S, It was added D TD S and 0.2 parts by weight of BMP DS of 2 parts by weight, dissolving the L i PF 6 in 1. 3 5 mo 1 ZL as a solute to be al to obtain a non-aqueous electrolyte solution.
- Each lithium polymer secondary battery produced using the non-aqueous electrolyte of Examples 1 to 30 and Comparative Examples 1 to 5 was subjected to a high-temperature storage test.
- BMPDS stands for propylene carbonate, 1,3-propanesultone, vinylene carbonate, diphenyldisulphide, di-p-tolyldisulphide and bis (4-methoxyphenyl) disulphide, respectively.
- Additive amount (parts by weight) Increase in battery thickness (mm)
- Example 1 2. 0 4.0 0 0.241
- Example 2 0.5 0. 1 0. 0 0. 0 1.26 91.1
- Example 3 0.5. 0. 0 0. 1 0. 0 1.22 90.7
- Example 4 0.5. 0 0. 0 0. 1 1.25 91.2
- Example 5 3. 0 0. 4 0. 0 0. 0 1.21 91.3
- Example 6 3. 0 0. 0 0. 4 0. 0 1 20 90.3
- Example 7 3.0 0. 0 0. 0 0. 4 1.19 91.0
- Example 8 0.5 0. 1 0. 0 0. 1 1.18 89. 9
- Example 9 0.5 0. 0 0. 1 0. 1 1.24 90.8
- Example 10 0. '5 0. 1 0. 1 0. 0 1.25 90.3
- Example 12 3.0.0.2 0.
- Example 215 the thickness of the battery increased. This suggests gas generation due to decomposition of additives during high-temperature storage.
- the amount of gas generated by the decomposition of additives is small, there is a problem that the thickness of the battery increases when the strength of the battery case is high, such as in a cylindrical lithium secondary battery. Absent. Therefore, only an excellent synergistic effect can be obtained by using VC in combination with at least one selected from the group consisting of DPDS, DTDS and BMPDS.
- the batteries of Examples 16 to 30 had an increase in thickness of 0.20 to 0.26 mm, and gas generation during high-temperature storage was sufficiently suppressed. You can see that it is. Further, the batteries of Examples 16 to 30 had a capacity retention ratio of 88 to 95% after 100 cycles, and had excellent cycle characteristics.
- VC, DPDS, DTDS and BMPDS have the effect of improving the cycle characteristics, but are considered to decompose and generate gas when stored at high temperatures.
- gas generation can be suppressed, so that both effects of suppressing gas generation and improving cycle characteristics can be obtained.
- PC Particularly excellent effect is obtained when at least one selected from the group consisting of DPS, DTDS and BMPDS is used.
- Japanese Patent Application Laid-Open No. Hei 10-247517 states that by adding DPDS to an electrolytic solution, the safety of a battery during overcharge is improved.
- DPDS was added to the electrolyte at a high concentration of about 3%.
- gas generation at high temperatures is remarkable, and the problem of gas generation cannot be solved.
- the addition of a small amount of 0.1 to 0.6% by weight of DPDS to the non-aqueous solvent suppresses gas generation at high temperature, and This is important for improving the cycle characteristics.
- Japanese Patent Application Laid-Open No. 2000-149996 describes that the addition of DTDS to an electrolytic solution improves the cycle characteristics and storage characteristics of a battery. However, simply adding DTDS to the electrolytic solution does not solve the problem of battery storage characteristics. As in the present invention,
- DTDS in combination with VC, or PC and PS, in order to suppress gas generation at high temperatures and to improve cycle characteristics.
- Japanese Patent Application Laid-Open No. 11-167266 discloses an example of a battery containing PC, a chain carbonate, and VC.
- the use of a small amount of VC, 0.1 to 5.0% by weight based on the nonaqueous solvent, in combination with PC and PS suppresses gas generation at high temperatures and reduces the cycle. It is important for improving the characteristics.
- the amount of the additive to be added to the non-aqueous solvent was examined.
- a non-aqueous electrolyte was obtained in the same manner as in Example 16 except that the amount of PC per 100 parts by weight of the mixed solvent was 0.1 part by weight and the amount of PS was 0.1 part by weight. 3 2
- a non-aqueous electrolyte was obtained in the same manner as in Example 16 except that the amount of PC per 100 parts by weight of the mixed solvent was changed to 5.0 parts by weight, and the amount of PS was changed to 6.5 parts by weight. 3 3
- a non-aqueous electrolyte was obtained in the same manner as in Example 16 except that the amount of VC per 100 parts by weight of the mixed solvent was changed to 0.1 part by weight.
- a non-aqueous electrolyte was obtained in the same manner as in Example 16, except that the amount of VC per 100 parts by weight of the mixed solvent was changed to 0 parts by weight.
- a non-aqueous electrolyte was obtained in the same manner as in Example 20, except that the amount of VC per 100 parts by weight of the mixed solvent was changed to 50 parts by weight.
- a non-aqueous electrolyte was obtained in the same manner as in Example 20, except that the amount of DPDS per 100 parts by weight of the mixed solvent was changed to 01 parts by weight.
- a non-aqueous electrolyte was obtained in the same manner as in Example 20, except that the amount of DPDS per 100 parts by weight of the mixed solvent was 0.6 parts by weight.
- Example 21 A non-aqueous electrolyte was obtained in the same manner as in Example 21 except that the amount of DTDS per 100 parts by weight of the mixed solvent was changed to 01 parts by weight.
- Example 40 A non-aqueous electrolyte was obtained in the same manner as in Example 21 except that the amount of DTDS per 100 parts by weight of the mixed solvent was 0.6 parts by weight.
- Example 4 1 A non-aqueous electrolyte was obtained in the same manner as in Example 21 except that the amount of DTDS per 100 parts by weight of the mixed solvent was 0.6 parts by weight.
- a non-aqueous electrolyte was obtained in the same manner as in Example 22 except that the amount of BMPDS per 100 parts by weight of the mixed solvent was 0: parts.
- Example 42
- a non-aqueous electrolyte was obtained in the same manner as in Example 22, except that the amount of BMPD.S per 100 parts by weight of the mixed solvent was 0.6 parts by weight.
- a non-aqueous electrolytic solution was obtained in the same manner as in Example 20 except that the amounts of PC, PS, VC and DPDS per 100 parts by weight of the mixed solvent were each 0.1 parts by weight.
- a non-aqueous electrolyte was obtained in the same manner as in Example 21 except that the amounts of PC, PS, VC and DTDS per 100 parts by weight of the mixed solvent were each 0.1 parts by weight.
- PC, PS, VC and DTD S per 100 parts by weight of the mixed solvent were 5.0 parts by weight, 6.5 parts by weight, 5.0 parts by weight and 0.6 parts by weight, respectively.
- a non-aqueous electrolyte was obtained in the same manner as in Example 21.
- Example 4 8 A non-aqueous electrolyte was obtained in the same manner as in Example 22 except that the amount of BMPDS was changed to 0.1 part by weight.
- Example 4 8 A non-aqueous electrolyte was obtained in the same manner as in Example 22 except that the amount of BMPDS was changed to 0.1 part by weight.
- a non-ice electrolytic solution was obtained in the same manner as in Example 22 except that the amount of BMPDS was changed to 5.0 parts by weight, 6.5 parts by weight, 5.0 parts by weight, and 0.6 parts by weight, respectively. .
- High temperature storage tests were performed on the lithium polymer secondary batteries prepared using the non-aqueous electrolytes of Examples 31 to 48 in the same manner as in Examples 1 to 30 and Comparative Examples 1 to 3.
- a charge / discharge cycle test was performed in the same manner as in Examples 2 to 15 and Comparative Examples 1, 4, and 5. The results are shown in Table 4. Table 4
- the amount of PS is 0.1 to 6.5 parts by weight per 100 parts by weight of the nonaqueous solvent, both the thickness and the capacity retention of the battery are good. This indicates that the amount of PS is preferably 0.1 to 6.5 parts by weight per 100 parts by weight of the nonaqueous solvent.
- the amounts of D. PDS, DTDS, and BMP DS are 0.1 to 0.6 parts by weight, respectively, per 100 parts by weight of the nonaqueous solvent, the battery thickness and capacity retention rate are , Both are good. From this, it is preferable that the amounts of DPDS, DTDS and BMPDS are each 0.1 to 0.6 parts by weight. I understand that it is good.
- the total amount of these additives is 0.4 to 17.1% by weight, the thickness and capacity retention of the battery are all good. Therefore, when at least one selected from the group consisting of PC, PS and VC, and DPDS, DTD S and BMPD S is added, the total amount is preferably 0.4 to 17.1 parts by weight. I understand.
- composition contains at least one selected from the group consisting of DPS, DTDS, and BMPDS.
- Examples 1 to 48 described above do not limit combinations of additives in the present invention.
- the present invention includes all combinations of additives.
- Examples 1 to 48 relate to a lithium polymer-secondary battery including a stacked electrode group, but the present invention is not limited to this.
- the non-aqueous electrolyte which is excellent in the cycle characteristic, the capacity retention rate, and the storage characteristic, and provides the non-aqueous electrolyte secondary battery which reduced the gas generation amount at the time of high temperature storage, and the secondary battery using the same Can be provided.
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60138812T DE60138812D1 (de) | 2000-06-26 | 2001-06-11 | Nichtwässriger elektrolyt und nichtwässrige elektrolyt-sekundärzelle |
EP01938597A EP1304758B1 (en) | 2000-06-26 | 2001-06-11 | Non-aqueous electrolyte and non-aqueous electrolyte secondary cell |
KR1020027017641A KR100546919B1 (ko) | 2000-06-26 | 2001-06-11 | 비수전해액 및 비수전해액 이차전지 |
US10/311,811 US7132199B2 (en) | 2000-06-26 | 2001-06-11 | Non-aqueous electrolyte and non-aqueous electrolyte secondary battery |
Applications Claiming Priority (4)
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JP2000-191795 | 2000-06-26 | ||
JP2000191795 | 2000-06-26 | ||
JP2000-352185 | 2000-11-20 | ||
JP2000352185A JP4762411B2 (ja) | 2000-06-26 | 2000-11-20 | 二次電池用非水電解液およびこれを用いた非水電解液二次電池 |
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WO2002001665A1 true WO2002001665A1 (fr) | 2002-01-03 |
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PCT/JP2001/004924 WO2002001665A1 (fr) | 2000-06-26 | 2001-06-11 | Electrolyte non aqueux et cellule secondaire de celui-ci |
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US (1) | US7132199B2 (ja) |
EP (1) | EP1304758B1 (ja) |
JP (1) | JP4762411B2 (ja) |
KR (1) | KR100546919B1 (ja) |
CN (2) | CN1202586C (ja) |
DE (1) | DE60138812D1 (ja) |
TW (1) | TW506156B (ja) |
WO (1) | WO2002001665A1 (ja) |
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Also Published As
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EP1304758A4 (en) | 2006-03-29 |
JP2002083632A (ja) | 2002-03-22 |
US7132199B2 (en) | 2006-11-07 |
CN1439179A (zh) | 2003-08-27 |
JP4762411B2 (ja) | 2011-08-31 |
KR20030019457A (ko) | 2003-03-06 |
US20040091786A1 (en) | 2004-05-13 |
EP1304758A1 (en) | 2003-04-23 |
TW506156B (en) | 2002-10-11 |
CN1202586C (zh) | 2005-05-18 |
DE60138812D1 (de) | 2009-07-09 |
KR100546919B1 (ko) | 2006-01-26 |
CN1591961A (zh) | 2005-03-09 |
EP1304758B1 (en) | 2009-05-27 |
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