WO2019103573A1 - Électrode positive et batterie secondaire au lithium la comprenant - Google Patents

Électrode positive et batterie secondaire au lithium la comprenant Download PDF

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Publication number
WO2019103573A1
WO2019103573A1 PCT/KR2018/014722 KR2018014722W WO2019103573A1 WO 2019103573 A1 WO2019103573 A1 WO 2019103573A1 KR 2018014722 W KR2018014722 W KR 2018014722W WO 2019103573 A1 WO2019103573 A1 WO 2019103573A1
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Prior art keywords
layer
anode
lithium
positive electrode
secondary battery
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Application number
PCT/KR2018/014722
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English (en)
Korean (ko)
Inventor
송주용
김인철
김주리
김현민
Original Assignee
주식회사 엘지화학
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Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to US16/607,297 priority Critical patent/US11404689B2/en
Priority to CN201880019051.5A priority patent/CN110447128B/zh
Priority to EP18881270.5A priority patent/EP3598534B1/fr
Priority to JP2019548383A priority patent/JP7086407B2/ja
Priority claimed from KR1020180148008A external-priority patent/KR102434255B1/ko
Publication of WO2019103573A1 publication Critical patent/WO2019103573A1/fr

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Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

  • Anode and lithium secondary battery comprising same
  • the present invention relates to a positive electrode and a lithium secondary battery comprising the same.
  • the lithium ion secondary battery is applied to the cathode and the anode in which an electrode active material capable of reversible insertion and desorption of lyrium ions is applied to each of the cathodes and the anodes to realize movement of lithium ions through the electrolyte, .
  • Lithium ions which are released (battery discharged) after being inserted (battery charged) into the negative electrode and lithium ions which can not be recovered (discharged from the battery) after being desorbed (battery charged) from the positive electrode are inevitably generated inevitably. Capacity.
  • the cathode active material and the lyrium oxide-based compound are coated on the cathode current collector in a double manner to effectively cancel the irreversible capacity imbalance of the two electrodes and further increase the initial charging capacity of the anode. . 2019/103573 1 »(: 1 ⁇ ⁇ 2018/014722
  • the anode in one embodiment includes: a cathode current collector; a first layer positioned on the cathode current collector, the first layer including a cathode active material; And a second layer disposed on the first layer and including a lithium oxide-based compound represented by the following formula (1), and can be applied to a lithium secondary battery:
  • M is at least one kind of alkali metal element, and show is at least one kind of halogen element, and -0.005 ⁇ ? 0.005,0 ⁇ 0.01, 0.995 ⁇ 1 ? ⁇ 2.005,
  • the lithium secondary battery to which the anode of one embodiment is applied can effectively cancel the irreversible capacity imbalance of the two electrodes, increase the initial charging capacity of the anode, reduce the energy density loss during operation of the battery, and have excellent lifetime characteristics.
  • Fig. 1 is a graph for evaluating initial charging characteristics for each of the batteries of Examples and Comparative Examples. DETAILED DESCRIPTION OF THE INVENTION
  • a member when a member is " on " another member, it includes not only when the member is in contact with the other member, but also when there is another member between the two members.
  • " combination (s) thereof " included in the expression of the machine form means a mixture or combination of one or more elements selected from the group consisting of the constituents described in the expression of the form of a marker, Quot; means at least one selected from the group consisting of the above-mentioned elements.
  • " show and / or description " means " show or show " complete
  • a positive electrode collector a first layer positioned on the positive electrode collector, the first layer including a positive electrode active material, a conductive material, and a binder; And a second layer disposed on the first layer and including a lyrium oxide-based compound represented by the general formula ( 1 ).
  • M is at least one kind of alkali metal element and A is at least one kind of halogen element, -0.005 £ a £ 0.005,0 £ x ⁇ 0.01, 0.995 ⁇ b ⁇ 2.005, 0 ⁇ y ⁇ 0.005.
  • the positive electrode of one embodiment may be prepared by a process comprising the steps of: 1) providing the lithium-tin oxide compound represented by Formula 1 above to compensate for the irreversible additive capacity of the negative electrode; 2) adding the positive electrode active material and the lithium oxide- By coating the compound with a double layer, it is possible to solve the problem of blending them into a single layer.
  • the lithium oxide-based compound represented by the above formula (1) is a substance capable of offsetting the irreversible capacity imbalance between the two electrodes and increasing the initial efficiency of the anode.
  • the lyrium peroxide (Li 2 O 2 ) is capable of irreversibly releasing lithium ions and oxygen.
  • the reaction is an Oxygen Evolution Reaction (OER) in the following Reaction Scheme 1, and it is possible to irreversibly release 2 moles of lithium ions together with 1 mole of oxygen per 1 mole of the lithium peroxide (2O2).
  • OER Oxygen Evolution Reaction
  • lyrium peroxide Li 2 O 2
  • all the lyrium oxide compounds represented by the above formula (1) include excessive lime in comparison with a conventional cathode active material in a 1 molar amount of lime, It is a compound that can release an excessive amount of lithium.
  • lyrium oxide-based compound to the anode reduces the irreversible capacity of the anode upon initial charging and discharging of the battery, thereby eliminating the irreversible capacity imbalance between the anode and the cathode and increasing the initial efficiency of the anode .
  • the lithium oxide-based compound is not applied in a blended state with the cathode active material, but is applied independently of the cathode active material.
  • the cathode active material is coated by blending the lithium oxide-based compound with the cathode active material, the following problems may occur have.
  • Oxygen (0 2 , ) gas produced by the lithium oxide-based compound upon premature neutralization of the battery may cause voids in the coating layer (single layer). Due to the pores in the coating layer (single layer) thus generated, ii) the anode density after the initial charging of the battery as well as the energy density of the whole battery can be lowered.
  • one embodiment solves the problem of a coating layer (single layer) formed by blending the lyrium oxide-based compound with the cathode active material by double coating the cathode active material and the lyrium oxide-based compound on the cathode current collector As follows.
  • the reduction decomposition reaction of the lithium-tin oxide compound is performed on the surface of the second layer in contact with the electrolyte, so that i) without affecting the first layer (that is, (Ii) the loss of electrode density of the first layer and (iii) the decrease of the energy density of the whole battery may be absent or very small.
  • the lithium secondary battery to which the anode of one embodiment is applied can effectively cancel the irreversible capacity imbalance of the two electrodes, increase the initial charging capacity of the anode, reduce the energy density loss of the anode, and have excellent lifetime characteristics.
  • the lithium oxide compound contained in the second layer is not particularly limited as long as it is represented by Formula 1 and is capable of reacting as shown in Reaction Scheme 1 to release lyrium ion.
  • it may be the lyrium peroxide (L 2 O 2), lyrium oxide (L 2 O), or a mixture thereof, as shown in Scheme 1.
  • the second layer may include platinum (Pt) in addition to the lithium oxide-based compound.
  • the platinum (Pt) is preferably such that the lyrium oxide-
  • the first layer may serve as a reaction catalyst, thereby contributing to the improvement of the reaction efficiency of the Reaction Scheme 1.
  • the reaction efficiency of the Reaction Scheme 1 1 to 5% by weight based on 100% by weight of the total amount of the layer, and the function of the platinum catalyst can be effectively exhibited in this range, but the present invention is not limited thereto. 2019/103573 1 »(: 1 ⁇ ⁇ 2018/014722
  • the second layer may further comprise a material, such as a conductive material, a binder, or a mixture thereof, which is generally applied to the positive electrode material mixture layer in the art. Concrete materials of the conductive material and the binder will be described later.
  • the first layer may further comprise a material, such as a conductive material, a binder, or a mixture thereof, which is generally applied to the positive electrode material mixture layer in the art. Concrete materials of the conductive material and the binder will be described later. Conductive material
  • the kind of the conductive material is not particularly limited.
  • the conductive material is used to form an electron conduction network in the first layer.
  • Any conductive material may be used without causing any chemical change in the battery.
  • the conductive material include natural graphite, artificial graphite Metal powders such as graphite, carbon black, acetylene black, ketjen black, carbon fiber, copper, nickel, aluminum and silver, metal fibers and the like can be used.
  • one or more conductive materials such as polyphenylene derivatives Can be mixed and used.
  • the conductive material may be used in an amount of 0.1 to 10 wt%, for example, 0.5 to 10 wt%, or 5 to 10 wt%, based on the total amount (100 wt%) of each of the first layer and the second layer, When the range is satisfied, the conductivity of each of the first layer and the second layer can be improved, but is not limited thereto.
  • the kind of the cathode active material may also be a metal of cobalt, manganese, nickel or a combination thereof; And lithium; a material capable of reversibly intercalating and deintercalating lithium ions, which is capable of reversibly intercalating and deintercalating lithium ions.
  • cathode active material a compound represented by any one of the following formulas may be used. ⁇ (wherein, 0.90 ⁇ 3 ⁇ 4
  • a compound having a coating layer on the surface of the compound may be used, or a compound having a coating layer may be mixed with the compound.
  • the coating layer may contain, as a coating element compound, an oxide, a hydroxide, a coating 2019/103573 1 »(: 1 ⁇ ⁇ 2018/014722
  • the compound constituting these coating layers may be amorphous or crystalline.
  • God, 0 0, Mixtures may be used.
  • the coating layer forming step may be carried out by any of coating methods such as spray coating, dipping, and the like without adversely affecting the physical properties of the cathode active material by using these elements in the above compound. It will be understood by people engaged in the field, so detailed explanation will be omitted.
  • the total amount of the first layer (100 wt%) and the weight of the cathode active material may be 1 to 99%, 1 to 80 wt%, for example, 1 to 70 wt%, regardless of the kind of the cathode active material. In this range, the energy density by the cathode active material can be secured, but is not limited thereto. bookbinder
  • the binder serves to adhere the positive electrode active material particles to each other and to adhere the positive electrode active material to the current collector.
  • Typical examples thereof include polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, an ethylene polymer comprising the oxide, polyvinyl pyrrolidone, ethylene, polyvinyl polyurethane, polytetrafluoroethylene Butadiene rubber, styrene-butadiene rubber, acrylated styrene-butadiene rubber, epoxy resin, nylon, and the like can be used, but the present invention is not limited thereto.
  • the anode of this embodiment can be prepared generally using methods known in the art. For example, after a mixture containing the cathode active material, the conductive material, and / or the binder is applied on the cathode current collector and dried to form the first layer, the lithium oxide-based compound alone or in combination with The 2019/103573 1 »(: 1 ⁇ ⁇ 2018/014722
  • the mixture is applied to the first layer and then dried to form the second layer, whereby the anode of one embodiment can be obtained.
  • the cathode current collector generally has a thickness of 3-500.
  • a positive electrode current collector is not particularly limited as long as it has high conductivity without causing chemical changes in the battery.
  • Examples of the positive electrode current collector include stainless steel, aluminum, nickel, titanium, sintered carbon, aluminum or stainless steel A surface treated with carbon, nickel, titanium, silver or the like may be used.
  • the current collector may have fine irregularities on the surface thereof to increase the adhesive force of the cathode active material, and various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric are possible.
  • the conductive material is used for forming an electron conduction network in the first layer. Any conductive material may be used without causing any chemical change in the battery. Examples of the conductive material include natural graphite, artificial graphite, carbon black , Metal powders such as acetylene black, ketjen black, carbon fiber, copper, nickel, aluminum, and silver, metal fibers and the like can be used, and conductive materials such as polyphenylene derivatives can be used singly or in combination . Is usually added in an amount of 1 to 50% by weight, 1 to 30% by weight, for example, 1 to 20% by weight based on the total amount of the first layer components (100% by weight). On the other hand, the above-described resilient woven materials can be used as a conductive material and can be used together with the materials.
  • the binder is a component that assists in bonding between the positive electrode active material and the conductive material and bonding to the current collector, and is usually 1 to 50% by weight, 1 to 50% by weight based on the total amount of the first layer components (100% 30% by weight, for example, 1 to 20% by weight.
  • binders examples include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CM (its), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene , Polyethylene, polypropylene, ethylene-propylene-diene ter Sulfonated styrene, styrene butadiene rubber, fluorine rubber, various copolymers, and the like.
  • CM carboxymethylcellulose
  • a filler is further added to the mixture to form the first layer 2019/103573 1 »(: 1 ⁇ ⁇ 2018/014722
  • the filler is not particularly limited as long as it is a fibrous material which is used selectively as a component for suppressing the expansion of the anode and does not cause chemical change in the battery.
  • the filler include olefin polymers such as polyethylene and polypropylene; Fibrous materials such as fibers and carbon fibers are used. Lithium secondary battery
  • a lithium secondary battery comprising the above-described two countries.
  • the lithium secondary battery according to an embodiment of the present invention includes the above-described positive electrode, so that the initial irreversible capacity of the negative electrode is reduced, the initial efficiency of the positive electrode is increased, and the decrease in energy density during driving is suppressed.
  • the lithium secondary battery can be generally manufactured in accordance with matters known in the art.
  • the negative electrode includes a current collector and a negative electrode active material layer formed on the current collector, and the negative electrode active material layer may include a negative electrode active material.
  • the negative electrode active material examples include a carbon-based negative electrode active material, a larium metal, an alloy of larium metal, a composite of 3 ⁇ 4 (3 ⁇ 4 (0 ⁇ X ⁇ 2), and a composite of a wax alloy (which is an alkali metal, an alkali earth metal, element, transition metal, rare earth element or a combination thereof, Silvery not), 811, 3 ⁇ 40 2, 8 11 -0 complex, and it requires 11-11 (the II is an alkali metal, alkaline earth metal, a Group 13 to 16 element, A transition metal, a rare earth element, or a combination thereof, and is not limited to urethane).
  • the negative electrode collector may generally be made to have a thickness of 3 - 500.
  • Such an anode current collector is not particularly limited as long as it has conductivity without causing chemical changes in the battery, and examples thereof include copper, stainless steel, aluminum, nickel, titanium, sintered carbon, copper or stainless steel 2019/103573 1 »(: 1 ⁇ ⁇ 2018/014722
  • the lithium secondary battery of one embodiment may be a lithium ion battery, a lithium ion polymer battery, or a lithium polymer battery, depending on the type of the electrolyte and / or the type of the separator.
  • the lithium secondary battery of one embodiment is a lyrium ion battery to which a liquid electrolyte is applied
  • the liquid electrolyte may be impregnated into the separation membrane.
  • the separation membrane is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used. Pore size of the membrane is generally 0.01 - 10 and Thyssen 1, the thickness is generally 5 - 300 a.
  • Such separation membranes include, for example, olefinic polymers such as polypropylene, which are chemically resistant and hydrophobic; A sheet or nonwoven fabric made of glass fiber, polyethylene or the like is used.
  • a solid electrolyte such as a polymer is used as an electrolyte
  • the solid electrolyte may also serve as a separation membrane.
  • the liquid electrolyte may be a non-aqueous electrolyte containing a lithium salt.
  • the lithium salt-containing nonaqueous electrolyte is composed of a nonaqueous electrolyte and lithium, and as the nonaqueous electrolyte, a nonaqueous organic solvent, an organic solid electrolyte, an inorganic solid electrolyte and the like are used, but the present invention is not limited thereto.
  • non-aqueous organic solvent examples include methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylenecarbonate, dimethyl carbonate, diethyl carbonate, And the like.
  • organic solvent examples include lactones, 1,2-dimethoxyethane, tetrahydroxyfurfurane (6 11 ( 0, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, But are not limited to, acetonitrile, nitromethane, methyl formate, methyl acetate, triester phosphate, trimethoxymethane, dioxolane derivatives, sulfolane, methylsulfolane, 1,3-dimethyl-
  • a nonionic organic solvent such as a carbonate derivative, a carbonate derivative, a tetrahydrofuran derivative, ether, methyl pyrophosphate, or ethyl propionate may be used.
  • organic solid electrolyte examples include a polymer electrolyte such as a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, an agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, A polymer containing an ionic dissociation group, etc. may be used.
  • a polymer electrolyte such as a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, an agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, A polymer containing an ionic dissociation group, etc. may be used.
  • Examples of the inorganic solid electrolyte include Li 3 N, Lil, Li 5 NI 2 , Li 3 N-LiI-LiOH, LiSiO 4 , LiSiO 4 -LiI-LiOH, Li 2 SiS 3 , Li 4 SiO 4 , include Li 4 Si0 4 -LiI-Li0H, Li 3 P0 4 -Li 2 S-SiS 2 and Li nitrides, halides and sulfates may be used.
  • the lithium salt is a material that is readily soluble in the non-aqueous electrolyte, for example, LiCl, LiBr, Lil, LiC10 4, LiBF 4, LiBi 0 Cli 0, LiPF 6, L1CF 3 SO 3, LiCF 3 C0 2, LiAsF 6 , LiSbF 6 , LiAlCU, CH 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, chloroborane lithium, lower aliphatic carboxylate lithium, lithium tetraphenylborate, imide and the like can be used.
  • the lithium salt-containing non-aqueous electrolyte may further contain, for the purpose of improving charge / discharge characteristics, flame retardancy, etc., for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylenediamine, n-glyme, N, N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salt, pyrrole, 2-methoxyethanol, aluminum trichloride, etc.
  • a halogen-containing solvent such as carbon tetrachloride, ethylene trifluoride or the like may be further added in order to impart nonflammability, and a carbon dioxide gas may be further added to improve high-temperature storage characteristics, FEC (Fluoro-Ethylene Carbonate), PRS (Propene sultone), and the like.
  • LiPF 6, L1CIO 4, L1BF 4, LiN (S0 2 CF 3) A lithium salt of 2, and so on, highly dielectric solvent of EC or PC cyclic carbonate and a low viscosity theft bound DEC, DMC or EMC linear Carbonate is added to the mixed solvent to prepare a lithium salt-containing non-aqueous electrolyte.
  • the lithium secondary battery of the embodiment may be implemented as a battery module including a unit cell, a battery pack including the battery module, and a device including the battery pack as a power source.
  • Example 1 Preparation of positive electrode
  • Example 2 An organic solvent was added to the positive electrode mixture of Example 1 to form a slurry phase, which was then coated on an aluminum current collector and vacuum-dried in a 120 o C vacuum oven for 12 hours.
  • Example 2 Preparation of lyrium secondary battery
  • the anode then was added to the organic solvent (NMP) to the mixture to form a slurry, coated onto the whole copper collector to prepare a cathode for 12 hours and dried in vacuo in a vacuum oven at 120 C O.
  • NMP organic solvent
  • a separator made of PP / PE having a thickness of 9 pm and a porosity of 42 vol was inserted between the cathode and the anode of Example 1 into a battery container, and an electrolyte was injected. Then, 2032 full-cells were produced according to a conventional manufacturing method. To prepare a lithium secondary battery.
  • Comparative Example 1 was dried of the positive electrode after the addition of the organic solvent (NMP) to the mixture to form a slurry, the aluminum current collector is coated on a 12 hours in a vacuum oven at 120 O C vacuo. The As a result, Comparative Example 1 A positive electrode was obtained. Comparative Example 2: Preparation of lyrium secondary battery
  • a lithium secondary battery of Comparative Example 2 was fabricated by using the positive electrode of Comparative Example 1 instead of the positive electrode of Example 1 and the remainder being the same as that of Example 1.
  • Experimental Example 1 Evaluation of initial charging and discharging characteristics of a battery I
  • Discharge 0.01 C, CC, 2.5 V, cut-off Comparative Examples and Examples can commonly apply lithium peroxide (Li 202) to the anode to compensate the irreversible additive capacity of the cathode.
  • Li 202 lithium peroxide
  • the lyrium peroxide (Li 202) is a compound which is capable of irreversibly releasing 2 moles of lyrium ion together with 1 mole of oxygen per 1 mole of theoretically, according to the following Reaction Scheme 1.
  • the Lyrium peroxide (Nishi 2 0 2) was compared to the comparative example is applied to the positive electrode active material and mixing ( ⁇ ) state, the lithium peroxide (10 2 ) was coated on the positive electrode material mixture layer (i.e., the first layer).
  • the reduction decomposition reaction of the ritupperoxide (Ni 2 O 2 ) is performed on the surface of the lyrium peroxide (Ni 2 O 2 ) layer (that is, the second layer) Is terminated by the disappearance of the second layer without affecting the first layer (i.e., without forming voids within the first layer). Therefore, 11) the loss of the electrode density of the first layer and 111) the energy density of the whole battery may be free or very little.
  • the embodiment is capable of effectively canceling the irreversible capacity imbalance of the two electrodes, the initial charge capacity of the anode being high, the loss of the energy density of the anode being small, and excellent lifetime characteristics, as compared with the comparative example.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

La présente invention concerne une électrode positive ainsi qu'une batterie secondaire au lithium la comprenant. Spécifiquement, l'électrode positive a un matériau actif d'électrode positive et un composé à base d'oxyde de lithium doublement-revêtu sur un collecteur de courant d'électrode positive, et ainsi un déséquilibre de capacité irréversible entre deux électrodes peut être efficacement annulé, et la capacité de charge de 1er cycle de l'électrode positive peut encore être augmentée.
PCT/KR2018/014722 2017-11-27 2018-11-27 Électrode positive et batterie secondaire au lithium la comprenant WO2019103573A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US16/607,297 US11404689B2 (en) 2017-11-27 2018-11-27 Positive electrode and lithium secondary battery including the same
CN201880019051.5A CN110447128B (zh) 2017-11-27 2018-11-27 正极和包含该正极的锂二次电池
EP18881270.5A EP3598534B1 (fr) 2017-11-27 2018-11-27 Électrode positive et batterie secondaire au lithium la comprenant
JP2019548383A JP7086407B2 (ja) 2017-11-27 2018-11-27 正極およびこれを含むリチウム二次電池

Applications Claiming Priority (4)

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KR20170159734 2017-11-27
KR10-2017-0159734 2017-11-27
KR10-2018-0148008 2018-11-27
KR1020180148008A KR102434255B1 (ko) 2017-11-27 2018-11-27 양극 및 이를 포함하는 리튬 이차 전지

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112868117A (zh) * 2019-09-24 2021-05-28 株式会社Lg化学 用于锂可充电电池的阳极和包括该阳极的锂可充电电池
CN116565292A (zh) * 2023-07-06 2023-08-08 宁德新能源科技有限公司 一种电化学装置及电子装置

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