WO2004066419A1 - リチウム二次電池用負極とその製造方法およびそれを用いたリチウム二次電池 - Google Patents
リチウム二次電池用負極とその製造方法およびそれを用いたリチウム二次電池 Download PDFInfo
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- WO2004066419A1 WO2004066419A1 PCT/JP2004/000463 JP2004000463W WO2004066419A1 WO 2004066419 A1 WO2004066419 A1 WO 2004066419A1 JP 2004000463 W JP2004000463 W JP 2004000463W WO 2004066419 A1 WO2004066419 A1 WO 2004066419A1
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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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
- H01M10/052—Li-accumulators
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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
- H01M10/052—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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- Negative electrode for lithium secondary battery method for producing the same, and
- the present invention relates to a negative electrode for a lithium secondary battery, and more particularly, to a high capacity,
- the present invention also relates to an inexpensive negative electrode for a lithium secondary battery having excellent cycle characteristics.
- Lithium secondary batteries are widely used as power sources for these portable electronic devices because of their high energy density, light weight, small size, and excellent charge / discharge cycle characteristics. With the increase, further capacity increase and cycle characteristics improvement technology are required.
- lithium secondary battery As a positive electrode active material, L i C o 0 2, L i N i 0 2, lithium-containing composite oxide such as L i M n 2 0 4 is used, as an anode active material, lithium A carbon material that can produce a high power rate for the printer and a high power rate for the printer is used.
- a carbon material that can produce a high power rate for the printer and a high power rate for the printer is used.
- carbon materials are not amorphous but tend to be highly crystalline in order to obtain higher energy density and higher voltage.
- natural graphite has the highest crystallinity and discharge capacity, and the mesoforce obtained by graphitization at around 300 ° C.
- Some artificial graphite such as Bon Microbeads (MCMB) has high crystallinity and large discharge capacity. However, these had the problem that the capacity was significantly reduced due to charge / discharge cycles.
- VGCF vapor-grown carbon fiber
- carbon black vapor-grown carbon fiber
- cycle characteristics see, for example, Japanese Patent Application Laid-Open No. 11-18818 (pages 2 to 4, Table 1), Japanese Patent Application Laid-Open No. H10-1498333 (Pages 2 to 6, Tables 1 to 3), Japanese Patent Application Laid-Open No. 111-1 No. 76442 (pages 2 to 7, FIGS. 2 to 7) and Japanese Patent Application Laid-Open No. 2000-61011 (pages 2 to 5, Table 1).
- these dissimilar carbons generally have a lower discharge capacity than the graphite negative electrode active material, and lower the high energy density, which is an advantage of the graphite negative electrode active material.
- vapor-grown carbon fiber causes high costs.
- the present invention has been made in view of the above circumstances, and provides a lithium secondary battery having a high capacity and excellent cycle characteristics by improving a negative electrode active material made of a carbon material.
- the present inventors have conducted intensive studies, and as a result, have developed a current collector that uses a combination of two types of graphite having a specific shape, particle size, and properties as a negative electrode active material made of a carbon material, and to which a binder is added.
- the inventors of the present invention have found that a high-capacity negative electrode for a lithium secondary battery having high capacity and excellent cycle characteristics can be obtained by coating, drying, and press-forming the same, and completed the present invention.
- the present invention relates to a negative electrode for a lithium secondary battery including a negative electrode active material and a binder, wherein the negative electrode active material includes graphite A and graphite B, and the primary particles of the graphite A have a spherical or elliptical shape.
- the average particle size of the primary particles of the graphite A is 10 or more and 30 or less, and the crystallite size and tap density in the c-axis direction of the graphite A are less than 100 nm and 1 respectively. .
- 0 g is the Roh cm 3 or more, wherein a is flat shape of the primary particles of the graphite B, said average particle size of the primary particles of the graphite B is at 1 0 / xm less than 1 m, the graphite B Provided is a negative electrode for a lithium secondary battery having a crystallite size in the c-axis direction of 100 nm or more.
- the shape of the primary particles is spherical or elliptical, Prepare graphite A with an average particle size of 10 m or more and 30 m or less, a crystallite size in the c-axis direction and a tap density of less than 100 nm, and 1.O gZcm 3 or more, respectively.
- Step B Prepare graphite B in which the shape of the primary particles is flat, the average particle size of the primary particles is 1 to 10 / im, and the crystallite size in the c-axis direction is 100 nm or more.
- Preparing the coating by mixing the graphite A and the graphite B in the presence of a binder and a solvent; applying the coating on a current collector, drying and applying pressure molding And a method for producing a negative electrode for a lithium secondary battery, the method including a step of performing a treatment.
- the present invention provides a lithium secondary battery including a positive electrode, the negative electrode for a lithium secondary battery, and a non-aqueous electrolyte.
- FIG. 1 is an enlarged external view of the graphite A used in Example 1 by a scanning electron microscope (SEM).
- FIG. 2 is an enlarged external view of the graphite B used in Example 1 by SEM.
- FIG. 3 is a partial longitudinal sectional view schematically showing the lithium secondary battery of Example 1.
- FIG. 4 is a top view schematically illustrating the lithium secondary battery of Example 1.
- FIG. 5 is a characteristic diagram showing cycle characteristics at 20 ° C. of the lithium secondary batteries of Examples 1, 2, and 6 and Comparative Examples 1 and 2.
- FIG. 6 is a characteristic diagram showing a capacity retention ratio at 20 ° C. as a cycle characteristic at 0 ° C. of each of the lithium secondary batteries of Examples 1 and 2 and Comparative Examples 1 and 2. Embodiment of the Invention Hereinafter, embodiments of the present invention will be described.
- a spherical or elliptical graphite A having an average primary particle diameter of 10 to 30 m is used as the graphite A.
- the particles are less likely to be oriented during pressing (during press molding) than general flaky graphite, resulting in high-rate discharge characteristics and low-temperature characteristics.
- This is advantageous because the specific surface area is reduced and the reactivity with the organic electrolyte is reduced, so that the cycle characteristics are improved.
- the primary particles of graphite A need not have a perfect spherical or elliptical shape, but may have a substantially spherical or almost elliptical shape, and may have irregularities on the surface as used in Example 1 described later. (See Fig. 1).
- Graphite A may contain both spherical primary particles and elliptical primary particles.
- the reason why the average particle size of the primary particles is 10 or more and 30 or less is that if the average particle size is less than 10 m, the reactivity with the organic electrolyte increases and the cycle characteristics deteriorate, and the average particle size exceeds 30 m. This is because the dispersion stability of the negative electrode paint is lowered and the productivity is lowered, or the surface of the negative electrode becomes uneven, thereby damaging the separator and causing an internal short circuit.
- the graphite A needs to have a crystallite size of less than 100 nm in the c-axis direction, and preferably 60 to 90 nm. With such a crystallite size, the reaction with the organic electrolyte is suppressed, and the cycle characteristics are improved.
- the size of the crystallite in the c-axis direction of graphite A was measured using the X-ray diffractometer "RAD-RC” manufactured by Rigaku Denki Co., Ltd. using the Gakushin method from the (002) diffraction line. It means the calculated value.
- graphite A needs to have a tap density of 1.0 g / cm 3 or more, and preferably 1.1 to 1.3 gZcm 3 . like this With a tap density, a decrease in the coating film density is suppressed, and good results can be obtained for increasing the energy density.
- the tap density of the graphite A based on the Japanese Industrial Standards (JISK 146 9)
- the sample 1 0 0 cm 3 was placed in a 1 5 0 cm 3 of the graduated cylinder one measures the sample weight, the measuring cylinder 5
- non-graphitic carbon has higher strength than graphite, is less likely to be deformed by pressing, and can maintain the above advantages even after electrode processing.
- non-graphitic carbon prevents direct contact between graphite and the organic electrolyte, thereby suppressing the reaction between the graphite surface and the non-aqueous electrolyte, and has the effect of further improving the cycle characteristics.
- the R value of the Raman spectrum when excited by an Ar laser at a wavelength of 5145 A [R I 1350 ZI 1580 ] (1135. is about 135 cm- 1 )
- Raman intensity (Raman intensity around 1580 cm- 1 of I 1580 ) is preferably 0.4 or more, more preferably 0.5 to 3.0.
- the coating with non-graphitic carbon is insufficient, so that the shape is easily deformed by pressing, and the reaction between the graphite surface and the organic electrolyte is not suppressed, thereby improving the cycle characteristics. It is difficult to get good results.
- the R value is the peak intensity I i 5 s around 158 cm ⁇ 1 in Raman spectrum measurement using one Ar laser beam with a wavelength of 5145 A. And the peak intensity at 135 0 cm- 1 near I 135 . And the intensity ratio
- Graphite A preferably has an axial ratio of primary particles (a value obtained by dividing the maximum diameter of the primary particles by the minimum diameter) of 1.2 or more, and more preferably 3 or less.
- the axis ratio is preferably 1.2 or more because this improves the contact between graphite particles and suppresses an increase in contact resistance due to charge / discharge cycles.
- the axis ratio is more preferably 1.5 or more. If the axial ratio exceeds 3, the graphite particles are easily broken at the time of preparing the negative electrode paint, and the cycle characteristics may be deteriorated due to the reaction between the surface of the newly generated graphite particles and the organic electrolyte, which is avoided. Therefore, the axial ratio is preferably 3 or less, more preferably 2.5 or less.
- the content of graphite A is preferably 10% by weight or more and 90% by weight or less, more preferably 20% by weight or less, based on the total weight of graphite A and graphite B described below. % To 80% by weight.
- the content is less than 10% by weight, the effect of improving the cycle characteristics by mixing becomes small, and when the content exceeds 90% by weight, the production margin of paint preparation conditions and pressure molding processing conditions becomes narrow, and the production cost increases. There is a possibility that.
- the graphite B is required to be flat graphite particles having an average primary particle size of 1 m or more and 10 m or less, and the primary particles are dispersed so that their orientation planes are dispersed. It is preferable that they are aggregated or combined to form secondary particles having an average particle size of 10 m or more and 30 m or less.
- graphite B freely changes its shape between the primary particles of graphite A.
- a good conductive path can be formed, the contact area with graphite A having a large particle size increases, and the contact resistance with graphite A decreases. For this reason, the initial large current characteristics are improved, which greatly contributes to the improvement of the active material utilization rate and the cycle characteristics.
- the average particle size of the primary particles of graphite B is set to 1 m or more, preferably 2 m or more, and more preferably 4 m or more, since the electrode capacity of the battery becomes small.
- the average particle size of the primary particles of graphite B is increased, it is difficult to increase the density of the negative electrode, and it is difficult to increase the capacity. The length is reduced, and the effect of improving the cycle characteristics is reduced.
- the graphite B needs to have a crystallite size of 100 nm or more in the c-axis direction, and preferably has a crystallite size of 105 to 150 nm. With such a crystallite size, it operates as a negative electrode active material having a high capacity, so that a high capacity electrode can be obtained.
- the size of the crystallite in the c-axis direction of graphite B was measured using the X-ray diffractometer “RAD-RC” manufactured by Rigaku Denki Co., Ltd. It means the value calculated using this.
- Graphite B preferably has an axial ratio of primary particles (a value obtained by dividing the maximum diameter of the plate surface by the plate thickness) of 1.5 or more, and more preferably 5 or less.
- the reason why the ratio is preferably 1.5 or more is that the contact between graphite particles is improved similarly to the case of graphite A, and the increase in contact resistance due to cycling is suppressed.
- the reason why it is preferably 5 or less is to prevent deterioration of cycle characteristics due to collapse of graphite particles at the time of preparing a negative electrode paint.
- At least one of the above-mentioned graphite A and graphite B is preferably natural graphite, and more preferably both are natural graphite.
- Natural graphite is inexpensive and has a high capacity, which makes it an electrode with high cost performance.
- the spherical or elliptical graphite A having the specific particle size and properties described above and the flat A suitable amount of graphite B is mixed with the mixture and mixed in the presence of an appropriate solvent such as a binder and water to prepare a paint, which is applied to an appropriate current collector such as a copper foil and dried. After that, pressing (pressing treatment) with a roller or the like is performed to produce a negative electrode for a lithium secondary battery.
- a mixture of an aqueous resin (a resin having a property of dissolving or dispersing in water) and a rubber-based resin is preferable as the binder used for manufacturing the negative electrode.
- the water-based resin contributes to the dispersion of graphite, and the rubber-based resin has an effect of preventing peeling of the coating film from the current collector due to expansion and contraction of the electrode during charge / discharge cycles.
- aqueous resin examples include cellulose resins such as polyvinylpyrrolidone, polyepichlorohydrin, polyvinylpyridine, polyvinyl alcohol, carboxymethylcellulose, and hydroxypropylcellulose; and polyether-based resins such as polyethylene oxide and polyethylene glycol.
- the rubber-based resin examples include latex, butyl rubber, fluoro rubber, styrene-butadiene rubber, ethylene-propylene-gen copolymer, polybutadiene, ethylene-propylene-gen copolymer (EPDM), and the like. The combination of carboxymethylcellulose with styrene butadiene rubber is the most common.
- graphite A has a high strength and therefore is not easily deformed by pressing, and graphite B changes its shape freely during pressing to form a graphite A between the primary particles.
- Negative Gokunurimaku density 1. 4 gZcm 3 or more preferably after pressing, 1. 5 gZcm 3 or more is more preferable.
- 1. S gZcm 3 or less are preferred, 1. 8 gZcm 3 or less is more preferable.
- a negative electrode of the lithium-containing and the negative electrode such as L i C O_ ⁇ 2, L i N i 0 2 , L i M n 2 0 4 as the positive electrode active material and a positive electrode using a composite oxide, housed in a battery case via a separator evening such microporous polyethylene film, L i PF 6 in a non-polar solvent such as E Ji alkylene carbonate and methyl E chill carbonate thereto
- a lithium secondary battery having various shapes such as a cylindrical shape, a square shape, a flat shape, and a coin shape can be obtained.
- the amount of vinylene carbonate added is preferably 0.5% by weight or more, more preferably 1% by weight or more, even more preferably 2% by weight or more, based on the weight of the nonaqueous electrolyte. If the content is too large, the storage characteristics tend to deteriorate. Therefore, the content is preferably 6% by weight or less, more preferably 5% by weight or less, and even more preferably 4% by weight or less.
- the negative electrode active material composed of the carbon material spherical or elliptic graphite A having a specific particle size and properties and flat graphite B having the same specific particle size and properties are also used.
- spherical or elliptic graphite A having a specific particle size and properties and flat graphite B having the same specific particle size and properties are also used.
- the crystallite size in the c-axis direction is 88.5 nm, (0 2 )
- the surface spacing d Q. 2 0. 3 3 5 7 nm, average particle size 1 7 im of primary particles by SEM, R value 1.6 7 0 of the Raman spectrum, the tap density of 1. 1 9 gZ cm 3, specific surface area 3 12 m 2 / g, and graphite A1 whose surface was coated with 3 to 4% by weight of non-graphitic carbon formed by baking pitch was used.
- Fig. 1 shows the appearance of this graphite A1 by SEM.
- graphite A1 contained at least substantially elliptical primary particles.
- Fig. 2 shows the appearance of graphite B by SEM. As shown in FIG. 2, the graphite B had flat primary particles aggregated to form secondary particles. A mixture of 30% by weight of graphite A1 and 70% by weight of graphite B was used as a negative electrode active material.
- Negative electrode active material 98% by weight of a mixture of these two types of graphite, 1% by weight of carboxymethylcellulose (CMC), 1% by weight of styrene butadiene rubber (SBR), and water as a binder was prepared.
- This negative electrode paint was applied to both surfaces of a copper foil (thickness: 10 ⁇ ) as a negative electrode current collector, and then water as a solvent was dried and pressed with a roller. Coating density was 1. 5 0 gZc m 3. After that, cutting was performed and the lead body was welded to produce a strip-shaped negative electrode.
- the L i C o 0 2 9 0 wt% as a positive electrode active material and force one carbon black 5 wt% as a conductive agent, a polyvinylidene fluoride 5 wt% as a binding agent, as a solvent N- Methyl-2-pyrrolidone (NMP) was mixed to prepare a positive electrode paint.
- NMP N- Methyl-2-pyrrolidone
- This positive electrode paint is applied to an aluminum foil (thickness: 15) as a positive electrode current collector. After coating on both sides of m), the solvent, NMP, was dried and pressed with a roller. Then, it was cut and the lead body was welded to produce a strip-shaped positive electrode. Next, the strip-shaped positive electrode and the strip-shaped negative electrode were swirled through a microporous polyethylene film having a thickness of 20 iim as a separator. An electrode wound body is formed by winding it into a battery case, and this is used as a battery case inside an aluminum bottomed cylindrical outer can with a width of 34.0 mm, a thickness of 4.0 mm, and a height of 50.0 mm. Filled. The positive electrode was welded to a positive electrode terminal via a positive electrode current collecting tab, and the negative electrode was welded to a negative electrode terminal via a negative electrode current collecting tab.
- liquid non-aqueous electrolyte 1 to 6 is added to a mixed solvent obtained by mixing ethylene force carbonate (EC) and methyl ethyl carbonate (MEC) at a volume ratio of 1: 2. 1. was dissolved in a proportion of 2 moles Z dm 3, were prepared those 3. added 0 by weight percent is Ranibi two alkylene carbonate (VC) with respect to the nonaqueous electrolyte by weight.
- EC ethylene force carbonate
- MEC methyl ethyl carbonate
- VC Ranibi two alkylene carbonate
- FIG. 3 and 4 show this prismatic lithium secondary battery.
- FIG. 3 is a partial longitudinal sectional view of the battery, and
- FIG. 4 is a top view.
- 1 is the positive electrode
- 2 is the negative electrode
- 3 is the separator
- 4 is the battery case
- 5 is the insulator
- 6 is the wound electrode
- 7 is the positive lead
- 8 is the negative lead
- Reference numeral 9 denotes a cover plate
- 10 denotes an insulating packing
- 11 denotes a terminal
- 12 denotes an insulator
- 13 denotes a lead plate.
- a prismatic lithium secondary battery was produced in the same manner as in Example 1 except that a mixture of graphite A1 at 70% by weight and graphite B at a ratio of 30% by weight was used as a negative electrode active material.
- the density of the negative electrode coating film was 1.50 g / cm 3 .
- a prismatic lithium secondary battery was produced in the same manner as in Example 1, except that a mixture of graphite A1 at 50% by weight and graphite B at a ratio of 50% by weight was used as the negative electrode active material.
- the density of the negative electrode coating film was 1.51 gZcm 3 .
- a prismatic lithium secondary battery was fabricated in the same manner as in Example 1, except that a mixture of graphite A1 at 90% by weight and graphite B at 10% by weight was used as a negative electrode active material.
- the density of the negative electrode coating film was 1.52 g / cm 3 .
- a prismatic lithium secondary battery was produced in the same manner as in Example 1, except that a mixture of graphite A1 at 10% by weight and graphite B at 90% by weight was used as a negative electrode active material.
- the density of the negative electrode coating film was 1.48 gZcm 3 .
- a prismatic lithium secondary battery was fabricated in the same manner as in Example 1, except that only graphite B was used as the negative electrode active material.
- the density of the negative electrode coating film was 1.50 gZcm 3 .
- a prismatic lithium secondary battery was produced in the same manner as in Example 1, except that only graphite A1 was used as the negative electrode active material.
- the density of the negative electrode coating film was 1.50 g / cm 3 .
- a prismatic lithium secondary battery was produced in the same manner as in Example 1, except that a mixture of 30% by weight of graphite A2 and 70% by weight of graphite B was used as a negative electrode active material. .
- the density of the negative electrode coating film was 1.50 g / cm 3 .
- a prismatic lithium secondary battery was fabricated in the same manner as in Example 6, except that only graphite A2 was used as the negative electrode active material.
- the density of the negative electrode coating film was 1.51 g / cm 3 .
- the lithium secondary batteries of Examples 1 to 5 using the negative electrode in which graphite A1 and graphite B were mixed were the lithium secondary batteries of Comparative Example 2 using only graphite A1.
- the battery dropped below the 50% discharge capacity of one cycle at 30 cycles, and the test was stopped.On the other hand, the battery maintained more than 85% of one cycle discharge capacity even after 400 cycles. It can be seen that the cycle characteristics have been dramatically improved. Also, it can be seen that the same or better cycle characteristics are obtained as compared with the lithium secondary battery of Comparative Example 1 using only graphite B.
- Example 6 It is also clear from the comparison between Example 6 and Example 1 that the discharge capacity in the first cycle is increased by coating with non-graphitic carbon.
- the lithium secondary batteries of Examples 1 and 2 using the negative electrode in which graphite A1 and graphite B were mixed are the lithium secondary batteries of Comparative Example 1 using only graphite B.
- the cycle characteristics at 0 ° C have been dramatically improved compared to that of the lithium secondary battery of Comparative Example 2 using only graphite A1, indicating that the same cycle characteristics were obtained. Understand.
- the reason why the above-mentioned excellent effects are exerted by the present invention is that the graphite B used is deformed at the time of pressing, so that the conductivity between the graphite A, the graphite A and the graphite B, and the conductivity between the active material and the copper foil are reduced. It is presumed that the improvement was based on the fact that the reaction between the graphite surface and the non-aqueous electrolyte was suppressed by the coating of non-graphitic carbon.
- the lithium secondary battery of the present invention is a high-capacity, low-cost battery with excellent cycle characteristics, and a high-capacity high-capacity battery that can be repeatedly charged and discharged, such as portable electronic devices such as mobile phones and notebook computers. It can be used as a secondary battery.
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Abstract
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/539,719 US20060073387A1 (en) | 2003-01-22 | 2004-01-21 | Negative electrode for lithium secondary battery, method for producing same, and lithium secondary battery using same |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP2003013117 | 2003-01-22 | ||
JP2003-013117 | 2003-01-22 | ||
JP2003-191909 | 2003-07-04 | ||
JP2003191909 | 2003-07-04 | ||
JP2004-002649 | 2004-01-08 | ||
JP2004002649A JP2005044775A (ja) | 2003-01-22 | 2004-01-08 | リチウム二次電池用負極とその製造方法およびそれを用いたリチウム二次電池 |
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PCT/JP2004/000463 WO2004066419A1 (ja) | 2003-01-22 | 2004-01-21 | リチウム二次電池用負極とその製造方法およびそれを用いたリチウム二次電池 |
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US (1) | US20060073387A1 (ja) |
JP (1) | JP2005044775A (ja) |
KR (2) | KR20050094451A (ja) |
WO (1) | WO2004066419A1 (ja) |
Cited By (1)
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Also Published As
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KR20070040853A (ko) | 2007-04-17 |
KR20050094451A (ko) | 2005-09-27 |
US20060073387A1 (en) | 2006-04-06 |
JP2005044775A (ja) | 2005-02-17 |
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