WO2014081240A1 - Électrolyte pour une batterie rechargeable au lithium, et batterie rechargeable au lithium qui comprend ce dernier - Google Patents

Électrolyte pour une batterie rechargeable au lithium, et batterie rechargeable au lithium qui comprend ce dernier Download PDF

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Publication number
WO2014081240A1
WO2014081240A1 PCT/KR2013/010685 KR2013010685W WO2014081240A1 WO 2014081240 A1 WO2014081240 A1 WO 2014081240A1 KR 2013010685 W KR2013010685 W KR 2013010685W WO 2014081240 A1 WO2014081240 A1 WO 2014081240A1
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WIPO (PCT)
Prior art keywords
carbonate
secondary battery
lithium
lithium secondary
electrolyte
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PCT/KR2013/010685
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English (en)
Korean (ko)
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윤유림
정종모
채종현
이철행
정근창
최영철
최영근
윤승재
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주식회사 엘지화학
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Priority to US14/425,377 priority Critical patent/US20150249269A1/en
Priority claimed from KR1020130142887A external-priority patent/KR20140066645A/ko
Publication of WO2014081240A1 publication Critical patent/WO2014081240A1/fr

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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
    • 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
    • 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
    • H01M10/0568—Liquid materials characterised by the solutes
    • 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
    • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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
    • H01M2300/0025—Organic electrolyte
    • H01M2300/0028—Organic electrolyte characterised by the solvent
    • H01M2300/0037—Mixture of solvents
    • 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 lithium secondary battery electrolyte and a lithium secondary battery comprising the same.
  • the lithium secondary battery used in the hybrid electric vehicle has a characteristic that can exhibit a large output in a short time, and must be used for more than 10 years under the harsh conditions in which charging and discharging by a large current is repeated in a short time, the conventional small lithium secondary battery Inevitably, better safety and output characteristics are required than batteries.
  • the conventional lithium secondary battery uses a layered structure of lithium cobalt composite oxide for the positive electrode and a graphite-based material for the negative electrode, but LiCoO 2 has good energy density and high temperature characteristics.
  • the output characteristics are poor, the high output temporarily required for oscillation and rapid acceleration, etc., is not suitable for hybrid electric vehicles (HEVs) requiring high power, and LiNiO 2 has a manufacturing method thereof. Due to the characteristics, it is difficult to apply to the actual mass production process at a reasonable cost, lithium manganese oxides such as LiMnO 2 , LiMn 2 O 4 has the disadvantage that the cycle characteristics are bad.
  • Lithium transition metal phosphate materials are classified into Naxicon-structured LixM 2 (PO 4 ) 3 and Olivine-structured LiMPO 4 , and have been studied as excellent materials at high temperature stability compared to LiCoO 2 . .
  • the anode active material has a very low discharge potential of about -3V with respect to the standard hydrogen electrode potential, and exhibits a very reversible charge and discharge behavior due to the uniaxial orientation of the graphite layer, thereby providing excellent electrode life characteristics (cycle Carbon-based active materials showing life) are mainly used.
  • the lithium secondary battery is prepared by placing a porous polymer separator between the negative electrode and the positive electrode, and put a non-aqueous electrolyte containing a lithium salt such as LiPF 6 .
  • a lithium salt such as LiPF 6
  • lithium ions of the positive electrode active material are released and inserted into the carbon layer of the negative electrode
  • lithium ions of the carbon layer are released and inserted into the positive electrode active material
  • the non-aqueous electrolyte is lithium ions between the negative electrode and the positive electrode.
  • Such lithium secondary batteries should basically be stable in the operating voltage range of the battery and have the ability to transfer ions at a sufficiently fast rate.
  • a carbonate solvent is used as the non-aqueous electrolyte, but the carbonate solvent has a problem that the viscosity increases, and thus the ion conductivity is decreased. Also, when some compounds are used as an electrolyte additive, some performance of the battery is improved, but rather Often, other performance was reduced.
  • the present invention aims to solve the problems of the prior art as described above and the technical problems that have been requested from the past.
  • LiFSI lithium bis (fluorosulfonyl) imide
  • LiFSI lithium bis (fluorosulfonyl) imide
  • LiPF 6 lithium hexa
  • the present invention provides a lithium secondary battery electrolyte containing a lithium salt and a non-aqueous solvent, wherein the lithium salt is LiFSI (lithium bis (fluorosulfonyl) imide), or LiFSI (lithium bis (fluorosulfonyl) ) Imide) and LiPF 6 (lithium hexafluoro phosphate),
  • the non-aqueous solvent provides an electrolyte solution for a secondary battery, characterized in that it comprises an ether solvent.
  • the carbonate solvent has a problem that the viscosity is large, the ion conductivity is small.
  • LiFSI lithium bis (fluorosulfonyl) imide
  • the sulfonyl imide group can lower the interfacial resistance lithium secondary battery comprising the same
  • the output characteristics can be improved at low temperatures as well as at room temperature.
  • LiFSI lithium bis (fluorosulfonyl) imide
  • Such LiFSI may be used alone as a lithium salt of an electrolyte for a lithium secondary battery, but when used with LiPF 6 , the effect may be maximized.
  • the content of LiFSI may be 10% by weight or more and less than 100% by weight based on the total weight of the lithium salt, and in detail, 50% by weight or more and less than 100% by weight.
  • the content of the LiFSI is too small, the output characteristic effect due to the decrease in resistance is not expected, which is not preferable.
  • the molar concentration of the LiFSI may be 0.1 to 2 M in the electrolyte, and specifically 0.3 to 1.5 M.
  • the output characteristic effect due to the decrease in resistance cannot be obtained.
  • the viscosity of the electrolyte solution may be increased when the molar concentration of LiFSI is too high.
  • the molar concentration of LiPF 6 may be 0.01 to 1 M in the electrolyte.
  • the ether solvent may be at least one selected from tetrahydrofuran, 2-methyltetrahydrofuran, dimethyl ether, dimethoxyethane and dibutyl ether, and in detail, may be dimethyl ether or dimethoxyethane.
  • the electrolyte solution may further include a carbonate solvent.
  • the ether solvent and the carbonate solvent may be 10:90 to 90:10 based on the total volume ratio of the electrolyte, and in detail, 20:80 to 80:10.
  • the content of the carbonate solvent is too high, the ion conductivity of the electrolyte may be deteriorated due to the carbonate solvent having a high viscosity. If the content of the carbonate solvent is too small, the lithium salt may not be dissolved in the electrolyte, resulting in low ion dissociation. It can be undesirable.
  • the carbonate solvent may be, for example, a cyclic carbonate
  • the cyclic carbonate may be ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2 At least one selected from the group consisting of -pentylene carbonate, and 2,3-pentylene carbonate.
  • the carbonate-based solvent may further include a linear carbonate
  • the linear carbonate is dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), ethyl methyl carbonate (EMC), methyl propyl
  • DMC dimethyl carbonate
  • DEC diethyl carbonate
  • DPC dipropyl carbonate
  • EMC ethyl methyl carbonate
  • MPC ethyl methyl carbonate
  • methyl propyl It includes at least one selected from the group consisting of carbonate (MPC) and ethyl propyl carbonate (EPC), in which case the cyclic carbonate and linear carbonate has a mixing ratio of 1: 4 to 4: 1 ratio based on the carbonate solvent volume ratio Can be.
  • the present invention provides a lithium secondary battery that is configured to include the electrolyte solution for lithium secondary batteries.
  • the lithium secondary battery (i) a positive electrode containing a lithium metal phosphate of the formula (1) as a positive electrode active material;
  • M is at least one member selected from the group consisting of metals of Groups 2 to 12;
  • X is at least one selected from F, S and N, and -0.5 ⁇ a ⁇ + 0.5, and 0 ⁇ b ⁇ 0.1.
  • the lithium metal phosphate may be lithium iron phosphate having an olivine crystal structure of Formula 2 below.
  • M ' is at least one selected from Al, Mg, Ni, Co, Mn, Ti, Ga, Cu, V, Nb, Zr, Ce, In, Zn and Y
  • X is selected from F, S and N At least one selected, -0.5 ⁇ a ⁇ + 0.5, 0 ⁇ x ⁇ 0.5, and 0 ⁇ b ⁇ 0.1.
  • the conductivity may be lowered, the lithium iron phosphate may not be able to maintain the olivine structure, and the rate characteristics may deteriorate or the capacity may be lowered.
  • the lithium iron phosphate of the olivine crystal structure may include LiFePO 4 , Li (Fe, Mn) PO 4 , Li (Fe, Co) PO 4 , Li (Fe, Ni) PO 4 , and the like. In more detail, it can be LiFePO 4 .
  • the lithium secondary battery of the present invention is yet to address the internal increased resistance problems that may result from the low electronic conductivity of the LiFePO 4 by applying the LiFePO 4 and applying an amorphous carbon as an anode active material to cathode active material, superior high-temperature stability and output Can exhibit characteristics.
  • the predetermined electrolyte solution according to the present invention when applied together, it can exhibit excellent room temperature and low temperature output characteristics as compared with the case of using a carbonaceous solvent.
  • the lithium metal phosphate may be composed of secondary particles in which primary particles and / or primary particles are physically aggregated.
  • the average particle diameter of the primary particles is 1 nanometer to 300 nanometers
  • the average particle diameter of the secondary particles may be 1 micrometer to 40 micrometers
  • the average particle diameter of the primary particles is 10 nanometers to 100 nanometers
  • the average particle diameter of the secondary particles may be 2 micrometers to 30 micrometers, and more specifically, the average particle diameter of the secondary particles may be 3 micrometers to 15 micrometers.
  • the average particle diameter of the primary particles is too large, the desired ion conductivity improvement cannot be exhibited. If too small, the battery manufacturing process is not easy. If the average particle diameter of the secondary particles is too large, the bulk density decreases. When too small, process efficiency cannot be exhibited and it is not preferable.
  • the specific surface area (BET) of these secondary particles can be 3 to 40 m 2 / g.
  • the lithium iron phosphate of the olivine crystal structure may be coated with, for example, conductive carbon in order to increase electronic conductivity, and in this case, the content of the conductive carbon may be 0.1 wt% to 10 wt% based on the total weight of the positive electrode active material. It may be, in detail may be 0.5% to 5% by weight.
  • the amount of the conductive carbon is too large, the amount of lithium metal phosphate is relatively decreased, so that the overall battery characteristics are reduced.
  • the amount is too small, the electron conductivity improvement effect cannot be exhibited, which is not preferable.
  • the conductive carbon may be applied to the surface of each of the primary particles and the secondary particles, for example, coating the surface of the primary particles to a thickness of 0.1 nanometer to 100 nanometers, and the surface of the secondary particles to 1 nanometer to It can be coated to a thickness of 300 nanometers.
  • the thickness of the carbon coating layer may be about 0.1 nanometers to 2.0 nanometers.
  • the amorphous carbon is a carbon-based compound except crystalline graphite, and may be, for example, hard carbon and / or soft carbon.
  • crystalline graphite When crystalline graphite is used, electrolyte decomposition may occur, which is not preferable.
  • the amorphous carbon may be prepared by a heat treatment at a temperature of 1800 degrees Celsius or less, for example, hard carbon is prepared by thermal decomposition of a phenol resin or furan resin, and soft carbon is coke, needle coke or pitch (Pitch) ) Can be prepared by carbonizing.
  • the lithium secondary battery includes a cathode prepared by applying the mixture of the cathode active material, the conductive material and the binder as described above on a cathode current collector, followed by drying and pressing, and a cathode manufactured using the same method, in which case, In some cases, a filler may be further added to the mixture.
  • the positive electrode current collector is generally made in a thickness of 3 micrometers to 500 micrometers. Such a positive electrode current collector is not particularly limited as long as it has high conductivity without causing chemical change in the battery. For example, stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel Surface-treated with carbon, nickel, titanium, silver, and the like may be used.
  • the current collector may form fine irregularities on its surface to increase the adhesion of the positive electrode active material, and may be in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.
  • the conductive material is typically added in an amount of 1% by weight to 50% by weight based on the total weight of the mixture including the positive electrode active material.
  • a conductive material is not particularly limited as long as it has conductivity without causing chemical change in the battery, and examples thereof include graphite such as natural graphite and artificial graphite; Carbon blacks such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder and nickel powder; Conductive whiskeys such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.
  • the binder is a component that assists in bonding the active material and the conductive material to the current collector, and is generally added in an amount of 1% by weight to 50% by weight based on the total weight of the mixture including the positive electrode active material.
  • binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.
  • the filler is optionally used as a component for inhibiting expansion of the positive electrode, and is not particularly limited as long as it is a fibrous material without causing chemical change in the battery.
  • the filler include olefinic polymers such as polyethylene and polypropylene; Fibrous materials, such as glass fiber and carbon fiber, are used.
  • the negative electrode current collector is generally made in a thickness of 3 micrometers to 500 micrometers.
  • a negative electrode current collector is not particularly limited as long as it has conductivity without causing chemical change in the battery.
  • the surface of copper, stainless steel, aluminum, nickel, titanium, calcined carbon, copper or stainless steel Surface-treated with carbon, nickel, titanium, silver, and the like, aluminum-cadmium alloy, and the like can be used.
  • fine concavities and convexities may be formed on the surface to enhance the bonding strength of the negative electrode active material, and may be used in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.
  • the lithium secondary battery may have a structure in which a lithium salt-containing electrolyte is impregnated into an electrode assembly having a separator interposed between a positive electrode and a negative electrode.
  • the separator is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used.
  • the pore diameter of the separator is generally 0.01 micrometer to 10 micrometers, and the thickness is generally 5 micrometers to 300 micrometers.
  • a separator for example, olefin polymers such as chemical resistance and hydrophobic polypropylene; Sheets or non-woven fabrics made of glass fibers or polyethylene are used.
  • a solid electrolyte such as a polymer
  • the solid electrolyte may also serve as a separator.
  • the lithium salt-containing electrolyte is composed of the non-aqueous organic solvent electrolyte and the lithium salt described above, and may additionally include an organic solid electrolyte, an inorganic solid electrolyte, and the like, but are not limited thereto.
  • organic solid electrolyte examples include polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphate ester polymers, polyedgetion lysine, polyester sulfides, polyvinyl alcohols, polyvinylidene fluorides, Polymerizers containing ionic dissociating groups and the like can be used.
  • Examples of the inorganic solid electrolyte include Li 3 N, LiI, Li 5 NI 2 , Li 3 N-LiI-LiOH, LiSiO 4 , LiSiO 4 -LiI-LiOH, Li 2 SiS 3 , Li 4 SiO 4 , Nitrides, halides, sulfates and the like of Li, such as Li 4 SiO 4 -LiI-LiOH, Li 3 PO 4 -Li 2 S-SiS 2 , and the like, may be used.
  • pyridine triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexaphosphate triamide, nitro Benzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyrroles, 2-methoxy ethanol, aluminum trichloride and the like may be added. .
  • a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further included, and carbon dioxide gas may be further included to improve high temperature storage characteristics, and FEC (Fluoro-Ethylene) may be further included. Carbonate), PRS (Propene sultone) may be further included.
  • the present invention provides a battery module comprising the lithium secondary battery as a unit cell and a battery pack including the battery module.
  • the battery pack may be used as a power source for devices requiring high temperature stability, long cycle characteristics, high rate characteristics, and the like.
  • Examples of the device may be an electric vehicle including an electric vehicle, a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), etc., but the secondary battery according to the present invention Since shows excellent room temperature and low temperature output characteristics, it can be preferably used in a hybrid electric vehicle in detail.
  • HEV hybrid electric vehicle
  • PHEV plug-in hybrid electric vehicle
  • 1 is a graph showing the XRD spectrum of the anode to which the amorphous carbon of the present invention is applied;
  • FIG. 6 is a graph showing room temperature resistance of lithium secondary batteries in Experimental Example 5.
  • LiFePO 4 86% by weight of LiFePO 4 , 8% by weight of Super-P (conductive agent) and 6% by weight of PVdF (binder) were added to NMP as a cathode active material to prepare a cathode mixture slurry. It was coated on one surface of aluminum foil, dried and pressed to prepare a positive electrode.
  • Super-P conductive agent
  • PVdF binder
  • a negative electrode mixture slurry was prepared by adding 93.5 wt% of soft carbon, 2 wt% of Super-P (conductive agent), 3 wt% of SBR (binder), and 1.5 wt% of thickener as a negative electrode active material to H 2 O as a solvent, and a copper foil. Coating, drying, and pressing on one side of the negative electrode was prepared.
  • LiPF 6 and 0.9 M of LiPF 6 were mixed with lithium salt in a mixed solvent of ethylene carbonate and dimethoxyethane in a volume ratio of 8 based on the volume ratio.
  • a lithium secondary battery was prepared by adding a lithium non-aqueous electrolyte solution containing M LiFSI.
  • a lithium secondary battery was manufactured in the same manner as in Example 1, except that only 1 M LiFSI was used as the lithium salt in Example 1.
  • a lithium secondary battery was manufactured in the same manner as in Example 1, except that 0.5 M LiPF 6 and 0.5 M LiFSI were used as lithium salts in Example 1.
  • a lithium secondary battery was manufactured in the same manner as in Example 1, except that 1 M LiPF 6 was used as a lithium salt.
  • Each cell obtained the resistance of each SOC through HPPC (Hybrid Pulse Power Characterization) test and compared the output at SOC 50%.
  • HPPC Hybrid Pulse Power Characterization
  • the battery of Example 1 according to the present invention has a higher room temperature output characteristics than the battery of Comparative Example 1.
  • Example 1 The lithium secondary batteries prepared in Example 1 and Comparative Example 1 were shown in FIG. 3 by measuring AC impedance by EIS (Electrochemical Impedance Spectroscopy) at a low temperature of 30 degrees Celsius.
  • EIS Electrochemical Impedance Spectroscopy
  • Each cell was cooled to 30 degrees Celsius at room temperature set to 50% SOC, and then measured by comparing the AC impedance.
  • the battery of Example 1 according to the present invention has higher low temperature resistance characteristics than the battery of Comparative Example 1.
  • Each cell was cooled to 30 degrees Celsius at room temperature, set to SOC 50%, and then discharged for 10 seconds at a constant voltage (120 mA) to compare the outputs.
  • Example 1 According to Figure 4, it can be seen that the battery of Example 1 according to the present invention has a higher low-temperature output characteristics than the battery of Comparative Example 1.
  • FIG. 1 Each cell was stored at 60 degrees Celsius storage chamber for 1 week at room temperature, adjusted to SOC 50%, followed by room temperature HPPC TEST.
  • Figure 5 shows storage capacity and resistance increase rate by room temperature HPPC TEST after 10 weeks of storage. Indicated.
  • the battery of Example 1 according to the present invention has a higher temperature durability than the battery of Comparative Example 1.
  • the resistance is measured at room temperature of the lithium secondary batteries prepared in Examples 1 to 3 and shown in FIG. 6.
  • the secondary battery according to the present invention can increase the ionic conductivity by using an electrolyte solution for a secondary battery comprising a lithium salt containing LiFSI and a non-aqueous solvent containing an ether solvent, and thus, excellent room temperature and low temperature. Output characteristics and improved high temperature life characteristics.
  • the battery internal resistance can be reduced, further improving the life characteristics and output characteristics, it can be suitably used for hybrid electric vehicles.

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Abstract

La présente invention se rapporte à : un électrolyte qui contient un sel de lithium et un solvant non aqueux pour une batterie rechargeable au lithium, le sel de lithium contenant le bis(fluorosulfonyl)imide de lithium (LiFSI), ou le bis(fluorosulfonyl)imide de lithium (LiFSI) et l'hexafluorophosphate de lithium (LiPF6), et le solvant non aqueux contenant un solvant à base d'éther ; et une batterie rechargeable au lithium qui comprend cet électrolyte.
PCT/KR2013/010685 2012-11-23 2013-11-22 Électrolyte pour une batterie rechargeable au lithium, et batterie rechargeable au lithium qui comprend ce dernier WO2014081240A1 (fr)

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US14/425,377 US20150249269A1 (en) 2012-11-23 2013-11-22 Electrolyte for lithium secondary batteries and lithium secondary battery including the same

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KR20120133863 2012-11-23
KR10-2012-0133863 2012-11-23
KR10-2013-0142887 2013-11-22
KR1020130142887A KR20140066645A (ko) 2012-11-23 2013-11-22 리튬 이차전지용 전해액 및 이를 포함하는 리튬 이차전지

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109155431A (zh) * 2016-11-03 2019-01-04 株式会社Lg化学 锂离子二次电池
CN115732758A (zh) * 2022-11-30 2023-03-03 九江天赐高新材料有限公司 一种适用于磷酸铁锂电池的电解液、锂二次电池
WO2023146163A1 (fr) * 2022-01-26 2023-08-03 주식회사 엘지에너지솔루션 Solution électrolytique pour batterie secondaire au lithium, et batterie secondaire au lithium la comprenant

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