WO2005093880A1 - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
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- WO2005093880A1 WO2005093880A1 PCT/JP2005/003723 JP2005003723W WO2005093880A1 WO 2005093880 A1 WO2005093880 A1 WO 2005093880A1 JP 2005003723 W JP2005003723 W JP 2005003723W WO 2005093880 A1 WO2005093880 A1 WO 2005093880A1
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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
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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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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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
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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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- 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
- H01M4/364—Composites as mixtures
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- H—ELECTRICITY
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- 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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
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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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M2010/4292—Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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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 secondary battery such as a lithium secondary battery.
- LiMO lithium transition metal complex acid represented by the chemical formula LiMO (M is a transition metal) using an alloy, metal lithium, or carbon material capable of occluding and releasing lithium ions as a negative electrode active material
- Non-aqueous electrolyte secondary batteries using oxides as the positive electrode active material are attracting attention as batteries having high energy density.
- lithium transition metal composite oxide lithium cobalt composite oxide (LiCoO)
- the charge end voltage is generally set to 4.1. -4. It is 2V.
- the positive electrode active material is not utilized at 50-60% of its theoretical capacity. Therefore, if the charge end voltage is further increased, the capacity (utilization rate) of the positive electrode can be improved, and the capacity and energy density can be increased.
- LiMO (M is a transition metal) Of lithium transition metal composite oxides
- Patent Document 1 Materials containing Mn and Ni have been studied as transfer metals, and material systems containing all three types of transition metal elements, Mn, Ni and Co, have also been actively studied (for example, see Patent Document 1). , Patent Document 2, Non-Patent Document 1, etc.).
- Patent Document 3 It has been reported (Patent Document 3).
- the present inventors have studied a battery using a lithium transition metal composite oxide containing Mn, Ni, and Co as a positive electrode active material. As a result, when the charging end voltage was increased, Deterioration of the structure of the positive electrode active material and decomposition of the electrolyte solution on the positive electrode surface are likely to occur, and the capacity reduction of the battery due to the charge / discharge cycle is more remarkable than in the case where the conventional 4.1-4.2 V was used as the end-of-charge voltage. I was helped to become.
- Patent Document 1 Japanese Patent No. 2561556
- Patent Document 2 Japanese Patent No. 3244314
- Patent Document 3 Japanese Patent Application Laid-Open No. 2002-42813
- Non-Patent Document 1 Journal of Power Sources 90 (2000) 176-181
- Non-patent document 2 Electrochemical and Solid-State Letters, 4 (12) A200- A203 (2001)
- Non-patent document 3 Proceedings of the 42nd Battery Symposium P.50-51
- An object of the present invention is to make it possible to increase the charge end voltage to 4.3 V or more without lowering the charge / discharge cycle characteristics and thermal stability, thereby increasing the charge / discharge capacity.
- An object of the present invention is to provide a non-aqueous electrolyte secondary battery.
- the present invention is a non-aqueous electrolyte secondary battery including a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, and a non-aqueous electrolyte.
- Lithium-transition metal complex oxide A in Ming is based on the fact that LiCoO contains Zr and Mg.
- the lithium transition metal composite oxide A exhibits good charge / discharge cycle characteristics even when the charge end voltage is increased.
- lithium transition metal composite oxide B shows high thermal stability.
- the charge end voltage can be increased to 4.3 V or more without lowering the charge / discharge cycle characteristics and thermal stability, thereby increasing the charge / discharge capacity.
- Zr is attached as a compound to the surface of the lithium transition metal composite oxide A. That is, it is preferable that Zr is contained in the lithium transition metal composite oxide A by attaching the compound of Zr to the surface of the lithium transition metal composite oxide A.
- the compound of Zr is preferably attached to the surface of the lithium transition metal composite oxide A in the form of particles. Since the Zr adheres to the surface of the lithium transition metal composite oxide A, it does not contribute to the stability of the crystal structure of the lithium transition metal composite oxide A. It is considered that the transfer of lithium ions and electrons on the surface of the metal composite oxide A is facilitated, and the oxidative decomposition of the electrolytic solution, which is a degradation reaction, can be suppressed.
- Mg is added, Mg is diffused into both the compound containing Zr and the lithium transition metal composite oxide A, and the compound containing Zr and the lithium transition metal composite oxide A are firmly bonded. It has been confirmed that it is sintered. Therefore, by the addition of Mg, the bonding state between the compound containing Zr and the lithium transition metal composite oxide A becomes stronger, and the effect of suppressing the decomposition of the electrolytic solution is improved. It is thought that it greatly improves.
- lithium-transition metal composite oxide A for example, a chemical formula: Li CoZr MgM O a ⁇ - ⁇ -y-z xyz 2
- M is at least one element selected from Al, Ti, and Sn, and a, x, y, and z are 0 ⁇ a ⁇ l. 1, x> 0, y> 0, z ⁇ 0 And 0 ⁇ x + y + z ⁇ 0.03.).
- M is particularly preferably A1.
- the lithium transition metal composite oxide B preferably contains Co as a transition metal, and more preferably, the amount of Mn is substantially equal to the amount of Ni.
- the Mn and Ni contents of the lithium transition metal composite oxide B are the most suitable for the properties of Mn, which has a small capacity but high thermal stability during charging, and Ni, which has a large capacity but low thermal stability during charging. Preferably, they are substantially equal for balancing.
- lithium transition metal composite oxide B for example, the chemical formula: Li Mn Ni Co O (wherein
- the proportion of the lithium transition metal composite oxide A in the positive electrode active material is preferably in the range of 51 to 90% by weight, and more preferably in the range of 70 to 80% by weight. Therefore, the proportion of the lithium transition metal composite oxide B is preferably in the range of 49 to 10% by weight, more preferably in the range of 30 to 20% by weight. By setting the content within such a range, both the charge / discharge cycle characteristics of the battery and the thermal stability can be obtained.
- the charge capacity ratio (the negative charge (Capacity Z positive electrode charge capacity) is preferably in the range of 1.0-1.2.
- the charge capacity ratio (negative electrode charge capacity Z positive electrode charge capacity) at the part where the positive and negative electrodes oppose each other, whether the end-of-charge voltage is designed to 4.3V or 4.4V It is preferably within the range of 1.0 to 1.2.
- the negative electrode active material in this case is an active material other than lithium metal. If the end-of-charge voltage is higher than 4.4V, decomposition of the electrolyte and collapse of the positive electrode may occur.
- the charge cutoff voltage is preferably 4.4 V or less because the suppression effect is not sufficient.
- the solvent of the non-aqueous electrolyte used in the present invention those which have been conventionally used as electrolyte solvents for lithium secondary batteries can be used.
- a mixed solvent of cyclic carbonate and chain carbonate is particularly preferably used.
- the cyclic carbonate include ethylene carbonate, propylene carbonate, butylene carbonate, and biylene carbonate.
- the chain carbonate include dimethinole carbonate, methylethyl carbonate, and getyl carbonate. Since the discharge characteristics of the battery are particularly improved by containing methyl ethyl carbonate as the chain force carbonate, it is preferable to include methyl ethyl carbonate.
- cyclic carbonate is liable to decompose at a high potential. Therefore, when a battery is charged at a high voltage of 4.3 V or higher, the content of the cyclic carbonate in the solvent is within the range of 10 to 50 vol%. It is preferable that ⁇ .
- ethylene carbonate EC
- ethylene carbonate propylene carbonate and Z or butylene carbonate are more likely to be oxidatively decomposed instead of ethylene carbonate in order to suppress decomposition at high potentials. You can use it. Also, the mixing ratio of cyclic carbonate such as ethylene carbonate may be reduced.
- a lithium salt generally used as a solute in a lithium secondary battery can be used.
- Such lithium salts include Li PF, LiBF, LiCF SO, LiN (CF SO), LiN (C F SO), LiN (CF SO) (C F S
- LiPF hexafluorophosphoric acid
- LiPF LiPF
- a conductive agent can be contained in the positive electrode.
- Charcoal as conductive agent When an elementary material is contained, the content of the carbon material is preferably 5% by weight or less based on the total of the positive electrode active material, the conductive agent, and the binder. This is because the electrolyte is easily decomposed on the surface of the carbon material, particularly when charged at a high end-of-charge voltage.
- LiCoO contains at least both Zr and Mg
- the end-of-charge voltage can be increased to 4.3 V or more without lowering the battery capacity, thereby increasing the charge / discharge capacity of the nonaqueous electrolyte secondary battery.
- FIG. 1 is a diagram showing a SEM backscattered electron image of LiCo Zr MgO (the scale in the diagram is
- Figure 2 is a diagram showing a TEM image of LiCo Zr Mg O (the square in the figure is 0.1 m
- FIG. 3 is a view showing an EDS measurement result at spot 1 in FIG. 2.
- FIG. 4 is a diagram showing an EDS measurement result at spot 2 in FIG. 2.
- the present invention will be described in more detail with reference to Examples.
- the present invention is not limited to the following Examples, and the gist thereof is not changed at all, but is appropriately changed as long as it is not changed. It can be implemented.
- Li CO, Co O, ZrO and MgO Li CO, Co O, ZrO and MgO, the molar ratio of Li: Co: Zr: Mg is 100: 99: 0.5: 0
- LiCo Zr After mixing in a mortar with an Ishikawa-type rai mortar so as to obtain a temperature of 850 ° C for 24 hours in an air atmosphere and then pulverizing, LiCo Zr with an average particle size of about 14 ⁇ m
- LiOH and the coprecipitated hydroxide represented by MnNiCo (OH) The mixture was mixed in an Ishikawa-type mortar with a molar ratio of 100: 100, heat-treated in an air atmosphere at 1000 ° C for 20 hours, and then pulverized to an average particle size of about 5 ⁇ m of LiMnNiCoO was obtained.
- LiCo Zr MgO and LiMnNiCoO obtained as described above are examples of LiCo Zr MgO and LiMnNiCoO obtained as described above.
- the mixture was mixed in an Ishikawa-type rai mortar so that the ratio by volume became 7: 3 to obtain a positive electrode active material.
- polyvinylidene fluoride as a binder is dissolved in N-methyl-2-pyrrolidone as a dispersion medium, and the positive electrode active material and carbon as a conductive agent are further dissolved in the active material and the conductive agent.
- the mixture was kneaded and kneaded so that the weight ratio of the binder was 90: 5: 5 to prepare a positive electrode slurry.
- the prepared slurry was applied on an aluminum foil as a current collector, dried, and then rolled using a rolling roller, and a current collector tab was attached to prepare a positive electrode.
- aqueous solution obtained by dissolving carboxymethylcellulose as a thickener in water artificial graphite as a negative electrode active material and styrene-butadiene rubber as a binder were added, and the weight ratio of the active material, the binder, and the thickener was used. Were mixed in a ratio of 95: 3: 2, and then kneaded to prepare a negative electrode slurry. The prepared slurry was applied onto a copper foil as a current collector, dried, and then rolled using a rolling roller, and a current collecting tab was attached to prepare a negative electrode.
- An electrolyte was prepared by dissolving LiPF in a solvent in which ethylene carbonate and getyl carbonate were mixed at a volume ratio of 3: 7 to a concentration of lmol / liter.
- the positive electrode and the negative electrode obtained in this manner are wound so as to face each other with a separator interposed therebetween to form a wound body.
- the wound body is laminated with an electrolytic solution together with an electrolyte.
- a nonaqueous electrolyte secondary battery A1 having a thickness of 3.6 mm, a width of 3.5 cm, and a length of 6.2 cm was obtained as a battery standard size.
- the amounts of the positive electrode active material and the negative electrode active material used are determined by the charge capacity ratio of the positive electrode and the negative electrode (the negative electrode charge capacity Z Capacity) is 1.15.
- the charge capacity ratio between the positive electrode and the negative electrode is The same applies to the following examples and comparative examples.
- the non-aqueous electrolyte secondary battery A1 was charged at a constant current of 650 mA until the voltage reached 4.45 V, and further charged at a constant voltage of 4.45 V until the current value reached 32 mA. After that, the battery was heated from room temperature to the set temperature at a rate of 5 ° C per minute and maintained at the set temperature for 2 hours to evaluate the thermal stability.
- the non-aqueous electrolyte secondary battery A1 was charged at a constant current of 650 mA until the voltage reached 4.4 V, and further charged at a constant voltage of 4.4 V until the current value reached 32 mA, and then 650 mA
- the battery was discharged at a constant current until the voltage reached the set voltage, thereby measuring the discharge capacity (mAh) of the battery. By repeating this charge and discharge, the charge and discharge cycle characteristics were evaluated.
- a secondary battery A2 was fabricated, and its thermal stability and charge / discharge cycle characteristics were evaluated.
- Li CO, Co O, ZrO, MgO, and Al O were converted to Li: Co: Zr: Mg:
- LiCo Zr Mg Al O and LiMn Ni Co O are mixed at a weight ratio of 7: 3.
- a non-aqueous electrolyte secondary battery A3 was prepared in the same manner as in Example 1 except that the mixing was performed so that the thermal stability and the charge / discharge cycle characteristics were evaluated.
- a degraded secondary battery A4 was fabricated, and its thermal stability and charge / discharge cycle characteristics were evaluated.
- a non-aqueous electrolyte secondary battery XI was produced in the same manner as in Example 1, and the thermal stability and the charge / discharge cycle characteristics were evaluated.
- a non-aqueous electrolyte secondary battery X2 was produced in the same manner as in Example 1, and the charge / discharge cycle characteristics were evaluated.
- Table 1 shows the evaluation results of the thermal stability of the nonaqueous electrolyte secondary batteries A1 to A4 of Examples 14 to 14 and the nonaqueous electrolyte secondary batteries XI of Comparative Example 1 manufactured as described above.
- Table 2 shows the evaluation results of the charge / discharge cycle characteristics of the nonaqueous electrolyte secondary batteries A1 to A4 of Examples 14 and 14 and the nonaqueous electrolyte secondary batteries X1 and X2 of Comparative Examples 1 and 2.
- the values in the boxes for the discharge capacity at the 100th cycle and the discharge capacity at the 300th cycle are the capacity retention ratios with respect to the initial discharge capacity.
- Example 2 A2 20% 3.IV 666.6
- lithium transition metal composite oxide A and lithium transition metal composite oxide B are mixed and used as the positive electrode active material when charged to It can be seen that the discharge cycle characteristics are improved. From this, it can be seen that by using a mixture of lithium transition metal composite oxide A and lithium transition metal composite oxide B, both high thermal stability and high cycle characteristics can be obtained.
- Examples 13 to 13 in which the lithium transition metal composite oxide B was mixed at a ratio of 20 to 30% by weight showed a particularly excellent capacity retention ratio after 300 cycles. . From this fact, by setting the mixing ratio of the lithium transition metal complex oxide A to 70 to 80% by weight and the mixing ratio of the lithium transition metal complex oxide B to 30 to 20% by weight, the cycle characteristics can be improved. It can be further enhanced.
- the reason for setting IV or higher is that when lithium transition metal composite oxide B is used, even if the final charge voltage is 4.2 V and the discharge cut voltage is lower than 2.9 V, deterioration due to cycling is large. (See Reference Experiment).
- LiCo Zr MgO used in Example 1 was observed with an electron microscope.
- FIG. 1 is an SEM backscattered electron image of LiCo Zr MgO used in Example 1.
- Fig. 2 is a TEM image of LiCo Zr MgO. As is clear from FIGS. 1 and 2,
- Small particles are attached to the surface of large particles.
- FIG. 3 shows the EDS measurement result at spot 1 in FIG. 2
- FIG. 4 shows the EDS measurement result at spot 2 in FIG.
- FIGS. 3 and 4 in the TEM image of FIG. 2, almost no Co was detected in the spot 1 and a large amount of Zr was detected.
- spot 2 no Zr was detected, and a large amount of Co was detected. From this, it can be seen that the adhered particles of spot 1 are Zr-containing compound particles, and that spot 2 is Zr-free LiCoO particles.
- Zr compound particles adhere to a part of the surface of the LiCoO particles.
- the surface of the LiCoO particles is exposed with most (80% or more) exposed.
- Mg is detected in both spot 1 and spot 2. Therefore, Mg diffuses into both Zr compound particles and LiCoO particles.
- Table 3 shows the charge / discharge cycle characteristics of the batteries B1 and B2 measured as described above.
- LiCo Zr Mg Al O and LiMn were used as the positive electrode active materials.
- LiCoO copper Zr and Mg and Sarako M (M) LiCoO copper Zr and Mg and Sarako M (M
- the charge-discharge cycle characteristics under the condition that the discharge cut voltage is reduced to 2.75V can be improved.
- a non-aqueous electrolyte secondary battery C1 was produced in exactly the same manner as in Example 1, and the discharge load characteristics were evaluated.
- a non-aqueous electrolyte secondary battery C2 was prepared in the same manner as in Example 1 except that an electrolytic solution prepared by dissolving 6 in a concentration of 1 mol Z liter was used, and the discharge load characteristics were evaluated. did.
- the non-aqueous electrolyte secondary battery C2 using methylethyl carbonate as the solvent for the electrolyte is the same as the non-aqueous electrolyte secondary battery C using getyl carbonate. It can be seen that discharge load characteristics are improved from 1. This is presumably because the use of methylethyl carbonate, which has a lower viscosity than getyl carbonate, as a solvent improves the permeability of the electrolyte to the electrodes and the ionic conductivity.
- a battery was fabricated as follows, and the cycle characteristics were evaluated at a final charge voltage of 4.2V.
- non-aqueous electrolyte secondary batteries Yl, # 2, and # 3 were produced in the same manner as in Example 1.
- the charge capacity ratio between the positive electrode and the negative electrode (the charge capacity of the negative electrode ⁇ the charge capacity of the positive electrode) when the amount of the positive electrode active material and the amount of the negative electrode active material are 4.2 V as the end-of-charge voltage is 1.15. I did it.
- the non-aqueous electrolyte secondary battery Y1 is charged at a constant current of 650 mA until the voltage reaches 4.2 V, and further charged at a constant voltage of 4.2 V until the current value reaches 32 mA, and then 650 mA
- the battery was discharged at a constant current of until the voltage reached 3. IV to measure the discharge capacity (mAh) of the battery. By repeating this charge / discharge, the charge / discharge cycle characteristics were evaluated.
- Table 5 shows the room temperature cycle characteristics of Y1-Y3 measured as described above. [Table 5]
- Lithium transition metal composite oxide B containing Mn and Ni and having a layered structure which is used as a positive electrode active material, has a lower initial charge / discharge efficiency than a graphite negative electrode. descend.
- the oxidation number of Mn is tetravalent (Mn 4+ ), and the oxidation state of Mn changes during charge and discharge. It is considered not to be done (Non-Patent Document 3, etc.).
- Mn 4+ tetravalent
- Mn 3+ undergoes a disproportionation reaction and Mn 4+ And Mn 2+ .
- Mn 2+ elutes from the positive electrode surface and precipitates on the negative electrode because it easily dissolves by forming a complex with the solvent constituting the electrolytic solution. It is speculated that the elution of the positive electrode surface force Mn disintegrates the crystal structure of the surface, and as a result, the resistance at the positive electrode electrolyte interface increases and the capacity deteriorates.
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/594,459 US7622223B2 (en) | 2004-03-29 | 2005-03-04 | Nonaqueous electrolyte secondary battery |
EP05719995A EP1734601B1 (en) | 2004-03-29 | 2005-03-04 | Nonaqueous electrolyte secondary battery |
US12/588,301 US7858237B2 (en) | 2004-03-29 | 2009-10-09 | Nonaqueous electrolyte secondary battery |
Applications Claiming Priority (4)
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JP2004-094475 | 2004-03-29 | ||
JP2004094475 | 2004-03-29 | ||
JP2004-320394 | 2004-11-04 | ||
JP2004320394A JP4660164B2 (ja) | 2004-03-29 | 2004-11-04 | 非水電解質二次電池 |
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US10/594,459 A-371-Of-International US7622223B2 (en) | 2004-03-29 | 2005-03-04 | Nonaqueous electrolyte secondary battery |
US12/588,301 Continuation US7858237B2 (en) | 2004-03-29 | 2009-10-09 | Nonaqueous electrolyte secondary battery |
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EP (1) | EP1734601B1 (ja) |
JP (1) | JP4660164B2 (ja) |
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1662600A1 (en) * | 2004-11-16 | 2006-05-31 | Sanyo Electric Co., Ltd. | Non-aqueous electrolyte secondary battery |
JP2006156230A (ja) * | 2004-11-30 | 2006-06-15 | Sanyo Electric Co Ltd | 非水電解質二次電池及びその充電方法 |
JP2006185793A (ja) * | 2004-12-28 | 2006-07-13 | Sanyo Electric Co Ltd | 非水電解質二次電池及びその充電方法 |
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Also Published As
Publication number | Publication date |
---|---|
US20070196736A1 (en) | 2007-08-23 |
EP1734601B1 (en) | 2013-02-20 |
US7622223B2 (en) | 2009-11-24 |
JP2005317499A (ja) | 2005-11-10 |
US7858237B2 (en) | 2010-12-28 |
KR20060132968A (ko) | 2006-12-22 |
JP4660164B2 (ja) | 2011-03-30 |
US20100112450A1 (en) | 2010-05-06 |
EP1734601A1 (en) | 2006-12-20 |
EP1734601A4 (en) | 2010-06-02 |
KR101045704B1 (ko) | 2011-06-30 |
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