WO2022131873A1 - 리튬이온 이차전지용 금속계-탄소계 복합 음극재, 이의 제조방법 및 이를 포함하는 이차전지 - Google Patents
리튬이온 이차전지용 금속계-탄소계 복합 음극재, 이의 제조방법 및 이를 포함하는 이차전지 Download PDFInfo
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- WO2022131873A1 WO2022131873A1 PCT/KR2021/019339 KR2021019339W WO2022131873A1 WO 2022131873 A1 WO2022131873 A1 WO 2022131873A1 KR 2021019339 W KR2021019339 W KR 2021019339W WO 2022131873 A1 WO2022131873 A1 WO 2022131873A1
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- Prior art keywords
- secondary battery
- metal
- lithium secondary
- nanoparticles
- active material
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- 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
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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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 an anode active material, a method for manufacturing the same, and a secondary battery including the same. Specifically, the present invention relates to a metal-based carbon-based composite negative electrode active material, a method for manufacturing the same, and a secondary battery including the same.
- Lithium-ion batteries are currently the most widely used secondary battery system in portable electronic communication devices, electric vehicles, and energy storage devices. Compared to commercial water-based secondary batteries (Ni-Cd, Ni-MH, etc.), these lithium-ion batteries have advantages such as high energy density, operating voltage, and relatively small self-discharge rate, and thus are attracting attention. However, in consideration of more efficient use time in portable devices, improvement of energy characteristics in electric vehicles, and the like, improvement in electrochemical characteristics still remains as technical problems to be solved. For this reason, a lot of research and development in the four major raw materials such as anode, cathode, electrolyte, and separator is still in progress.
- a metal-based composite negative electrode material that improves reversibility by compositing a metal-based (eg, silicon) that can electrochemically react with lithium and a conductive material (eg, graphite or carbon) (metal is included in the composite, carbon template)
- a metal-based eg, silicon
- a conductive material eg, graphite or carbon
- a conductive additive is additionally included in the composition of an existing metal-based composite negative electrode active material including metal particles, an amorphous carbon-based material, and a conductive material, thereby providing high efficiency and long lifespan. and to improve low expansion properties.
- Another object of the present invention is to provide a method for manufacturing the same and a secondary battery including the same.
- a carbon-based matrix comprising metal-based material nanoparticles supported in the carbon-based matrix, further comprising a conductive material and a conductive additive in the composite, wherein the conductive material is flaky graphite, and the conductive additive is carbon nanotubes,
- the content of the carbon nanotubes is 0.2 to 2.3 wt%, based on the metal-based nanoparticles in the composite, to provide an anode active material for a lithium secondary battery.
- the metal-based material nanoparticles may be derived from one selected from the group consisting of silicon, tin, and aluminum.
- the metal-based material nanoparticles may be pulverized metal-based material nanoparticles.
- the pulverized metal-based material nanoparticles may be needle-shaped, having a particle size D50 of 30 to 200 nm, and an aspect ratio greater than 1.5 by weight of 90 wt% or more of the total weight of the pulverized metallic material nanoparticles.
- the particle size D50 of the conductive material may be 3 to 12 ⁇ m.
- Another aspect of the present invention comprises the steps of pulverizing a metallic material into metallic material nanoparticles through a pulverizing process; obtaining spheroidized particles by spheronizing the pulverized metal-based material nanoparticles, the conductive material, and the conductive additive together; obtaining a composite by complexing the spherical particles with an amorphous carbon-based precursor material; and carbonizing the composite, wherein the conductive material is flaky graphite, the conductive additive is carbon nanotubes, and the content of the carbon nanotubes is 0.2 to 2.3 wt% compared to the metal-based material nanoparticles in the composite
- Provided is a method of manufacturing a negative active material for phosphorus and lithium secondary batteries.
- Obtaining a composite may be a step of mixing and binding the spherical particles and the amorphous carbon-based precursor material by a dry method or a wet method.
- the amorphous carbon-based precursor material may include one selected from the group consisting of coal-based pitch, petroleum-based pitch, and combinations thereof.
- the amorphous carbon-based precursor material may have a fixed carbon content of 50 to 85 wt%, and a softening point of less than 300°C.
- the metal-based material may be one selected from the group consisting of silicon, tin, and aluminum.
- the metal-based material nanoparticles may be pulverized metal-based material nanoparticles.
- the pulverized metal-based material nanoparticles may be needle-shaped, having a particle size D50 of 30 to 200 nm, and an aspect ratio greater than 1.5 by weight of 90 wt% or more of the total weight of the pulverized metallic material nanoparticles.
- the particle size D50 of the conductive material may be 3 to 12 ⁇ m.
- Carbonizing the composite may be a step of carbonizing at a temperature of 800 to 1000 °C for 0.5 to 2 hours.
- the negative electrode may include the negative active material for a lithium secondary battery of any one of claims 1 to 5.
- the present invention provides initial efficiency, longer life, and expansion control compared to a single conductive material by additionally including carbon nanotubes, which are conductive materials, when manufacturing a metal-carbon-based composite including metal particles, amorphous carbon-based materials and conductive materials. can solve the problem
- 1 is a diagram illustrating the configuration of a metal-based composite.
- first, second and third etc. are used to describe, but are not limited to, various parts, components, regions, layers and/or sections. These terms are used only to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, a first part, component, region, layer or section described below may be referred to as a second part, component, region, layer or section without departing from the scope of the present invention.
- % means weight %, and 1 ppm is 0.0001 weight %.
- a method for manufacturing an anode active material for a lithium secondary battery comprising: pulverizing a metallic material into metallic material nanoparticles through a pulverizing process; obtaining spheroidized particles by spheronizing the pulverized metal-based material nanoparticles, the conductive material, and the conductive additive together; obtaining a composite by complexing the spherical particles with an amorphous carbon-based precursor material; and carbonizing the composite, wherein the conductive material may be flaky graphite, and the conductive additive may be carbon nanotubes.
- the step of pulverizing the metallic material into metallic material nanoparticles is a step of obtaining nano-sized metallic material particles in a top-down method of milling large metallic material particles.
- the step of milling large metallic material particles to obtain metallic material nanoparticles may be performed in a wet process, and in this process, pulverized metallic material nanoparticles are caused by moisture and heat in the wet grinding solution. Oxidation may be made on the surface in an amount of 1 to 10% by weight.
- the metal-based material may be electrochemically reacted with lithium.
- the step of obtaining spherical particles may be carried out in such a way that the pulverized metal-based material nanoparticles, the conductive material, and the conductive additive are uniformly dry mixed and dispersed together, followed by a wet spray drying process.
- Obtaining a composite may be a step of obtaining a metal-based composite by mixing the spherical particles together with an amorphous carbon-based precursor material and densely complexing the spherical particles by applying a shearing force.
- Obtaining the composite may be carried out by a dry method or a wet method. Specifically selected from the group consisting of a planetary mixer, a 3D-mixer, a V-mixer, a mechano-fusion, a hybridizer, a Nobilta, a homo mixer, a Henschel mixer, an in-line mixer, and a spray dryer. It can be mixed and compounded by more than one method.
- the metal-based material nanoparticles can maintain electrical contact with other materials. That is, the amorphous carbon-based raw material may control the expansion of the metal-based material nanoparticles.
- Carbonizing the composite is a step of carbonizing the composite in an inert atmosphere for 0.5 to 2 hours at a temperature of 800 to 1000 °C.
- the reason for carrying out the heat treatment under the above conditions is to prevent oxidation of the metal-based material nanoparticles and to remove the volatile components (VM, Volatile Matter) of the amorphous carbon-based precursor material to convert to a higher quality amorphous carbon-based material and
- the fixed carbon of the amorphous carbon-based material is densely immersed and generated into the particles composed of the metallic material nanoparticles and the conductive material.
- the fixed carbon of an amorphous carbon-based material from which volatile matter (VM) is removed forms a matrix that supports the inside and outside of the spherical particles and serves to maintain contact (conductivity) can do.
- Carbonizing the composite may further include the step of molding the composite before.
- the method may further include a step of obtaining a molded article obtained by press-molding the composite. That is, the step of carbonizing the composite may be a step of carbonizing the molded article press-molded of the composite.
- carbonizing the composite may further include the step of pulverizing and classifying the carbonized compact thereafter.
- it may be a step of pulverizing and classifying the carbonized molded article to have a D50 of 9 to 15 ⁇ m.
- a linear contact (1-dimension) function may be provided. Silicon in a lithium secondary battery exhibits expansion and contraction behavior while repeatedly charging and discharging electrochemically.
- the amorphous carbon-based precursor material may include one selected from the group consisting of coal-based pitch, petroleum-based pitch, and combinations thereof. When an amorphous carbon-based precursor material is used, it may serve as a matrix of a metal-based composite to enhance structural stability after carbonization through heat treatment.
- the amorphous carbon-based precursor material may have a fixed carbon content of 50 to 85 wt%, and a softening point of less than 300°C. Specifically, the fixed carbon may be 65 to 80% by weight, and the softening point may be 100 to 270 °C.
- small molecules such as VM are volatilized and removed in the carbonization step, and after carbonization, the fixed carbon becomes carbon with 95% or more.
- This amorphous carbon-based matrix can prevent the structure of the metal-carbon composite of the anode active material from collapsing even when the charge/discharge cycle of the lithium secondary battery is repeated.
- the fixed carbon value of the amorphous carbon-based matrix increases, Si having low self-conductivity and a conductive path may be generated to induce an increase in capacity and efficiency.
- the internal pores of the negative active material of the present embodiment may be reduced. Accordingly, side reactions with the electrolyte can also be reduced, thereby contributing to an increase in the initial efficiency of the battery.
- the metal-based material may be one selected from the group consisting of silicon, tin, and aluminum. Preferably, it may be silicone. As mentioned above, the metal-based material nanoparticles can be obtained by obtaining nano-sized metal-based material particles in a top-down method of milling a large metal-based material.
- the metal-based material nanoparticles may be pulverized metal-based material nanoparticles.
- the metal-based material nanoparticles may have a particle size D50 of 30 to 200 nm.
- D50 based on the long side may be 30 to 200 nm, specifically 85 to 130 nm, and further, the aspect ratio of the pulverized metallic material nanoparticles is pulverized 90% by weight or more may be greater than 1.5 based on the total weight of the type metal-based material nanoparticles. That is, the pulverized metal-based material nanoparticles may be needle-shaped.
- the particle size D50 of the metal-based nanoparticles exceeds 200 nm, it may cause deterioration of lifespan due to volume expansion during the charging and discharging process of the lithium secondary battery.
- flaky graphite as a conductive material, it is possible to provide a surface contact function for maintaining the conductivity of the cluster in which nanoparticles in the composite are gathered, thereby improving electrochemical reversibility and conductivity inside the negative active material.
- the particle size D50 of the conductive material may be 3 to 12 ⁇ m. Specifically, it may be 6 to 11 ⁇ m. When the particle size D50 is less than 3 ⁇ m, there may be inferiority in conductivity and expansion, and when it exceeds 12 ⁇ m, it is difficult to mix in the composite.
- An anode active material is an anode active material for a lithium secondary battery, comprising: a carbon-based matrix; in, metal-based material nanoparticles; conductive material; and a carbonized metal-based composite including a conductive additive, wherein the conductive additive is a carbon nanotube, and the content of the carbon nanotube may be 0.2 to 2.3 wt% based on the metal-based material nanoparticles in the composite.
- the negative active material may be a negative active material prepared by the above-described manufacturing method.
- the carbonized metal-based composite may be one in which metal-based material nanoparticles, a conductive material, and a conductive additive are uniformly dispersed in a carbon-based matrix.
- the carbon-based matrix included in the carbonized metal-based composite may be derived from an amorphous carbon-based precursor material in the manufacturing method. Specifically, the carbon-based matrix may be carbonized of an amorphous carbon-based precursor material.
- metal-based material nanoparticles, conductive material, and conductive additive constituting the negative active material are the same as those in the above-described manufacturing method, and thus will be omitted herein.
- metal-based material nanoparticles, conductive additives, and conductive materials do not change in material properties such as a mixing ratio, size, and aspect ratio even if they undergo a carbonization step.
- the obtained negative active material may be usefully used for the negative electrode of a lithium secondary battery. That is, the lithium secondary battery according to an embodiment includes a negative electrode including the above-described negative active material together with a positive electrode and an electrolyte.
- a lithium secondary battery may include an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode. Such an electrode assembly is wound or folded and accommodated in a case to constitute a lithium secondary battery.
- the case may have a cylindrical shape, a square shape, a thin film shape, or the like, and may be appropriately deformed according to the type of device to be applied.
- the negative electrode may be prepared by mixing a negative electrode active material, a binder, and optionally a conductive material to prepare a composition for forming the negative electrode active material layer, and then applying it to the negative electrode current collector.
- the negative electrode current collector may be, for example, a copper foil, a nickel foil, a stainless steel foil, a titanium foil, a nickel foam, a copper foam, a polymer substrate coated with a conductive metal, or a combination thereof.
- binder examples include polyvinyl alcohol, carboxymethyl cellulose/styrene-butadiene rubber, hydroxypropylene cellulose, diacetylene cellulose, polyvinyl chloride, polyvinylpyrrolidone, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene or Polypropylene or the like may be used, but is not limited thereto.
- the binder may be mixed in an amount of 1 wt% to 30 wt% based on the total amount of the composition for forming the negative electrode active material layer.
- the conductive material is not particularly limited as long as it has conductivity without causing a chemical change in the battery, and specifically, graphite such as natural graphite and artificial graphite; carbon black, such as 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, aluminum, 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 may be used.
- the conductive material may be mixed in an amount of 0.1 wt% to 30 wt% based on the total amount of the composition for forming the negative electrode active material layer.
- the positive electrode may be prepared by mixing a positive electrode active material, a binder, and optionally a conductive material to prepare a composition for forming a positive electrode active material layer, and then applying the composition to a positive electrode current collector.
- the binder and the conductive material are used in the same manner as in the case of the above-described negative electrode.
- the positive electrode current collector may be, for example, stainless steel, aluminum, nickel, titanium, calcined carbon, or one in which the surface of aluminum or stainless steel is surface-treated with carbon, nickel, titanium, silver, or the like.
- a compound capable of reversible intercalation and deintercalation of lithium (a lithiated intercalation compound) may be used.
- the positive active material may use at least one of a complex oxide of a metal of cobalt, manganese, nickel, or a combination thereof and lithium, and a specific example thereof may be a compound represented by any one of the following formulas.
- Li a A 1-b R b D 2 (wherein 0.90 ⁇ a ⁇ 1.8 and 0 ⁇ b ⁇ 0.5);
- Li a E 1-b R b O 2-c D c (wherein 0.90 ⁇ a ⁇ 1.8, 0 ⁇ b ⁇ 0.5, and 0 ⁇ c ⁇ 0.05);
- LiE 2-b R b O 4-c D c (wherein 0 ⁇ b ⁇ 0.5 and 0 ⁇ c ⁇ 0.05);
- Li a Ni 1-bc Co b R c D ⁇ (wherein 0.90 ⁇ a ⁇ 1.8, 0 ⁇ b ⁇ 0.5, 0 ⁇ c ⁇ 0.05 and 0 ⁇ ⁇ ⁇ 2);
- A is Ni, Co, Mn, or a combination thereof;
- R is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof;
- D is O, F, S, P or a combination thereof;
- E is Co, Mn, or a combination thereof;
- Z is F, S, P or a combination thereof;
- G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V or a combination thereof;
- Q is Ti, Mo, Mn, or a combination thereof;
- T is Cr, V, Fe, Sc, Y or a combination thereof;
- J is V, Cr, Mn, Co, Ni, Cu, or a combination thereof.
- a non-aqueous electrolyte or a known solid electrolyte may be used, and a lithium salt dissolved therein may be used.
- the lithium salt is, for example, LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiClO 4 , LiCF 3 SO 3 , Li(CF 3 SO 2 ) 2 N, LiC 4 F 9 SO 3 , LiSbF 6 , LiAlO 4 , LiAlCl 4 , LiCl, and at least one selected from the group consisting of LiI may be used.
- Examples of the solvent for the non-aqueous electrolyte include cyclic carbonates such as ethylene carbonate, propylene carbonate, butylene carbonate, and vinylene carbonate; chain carbonates such as dimethyl carbonate, methyl ethyl carbonate, and diethyl carbonate; esters such as methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, and ⁇ -butyrolactone; ethers such as 1,2-dimethoxyethane, 1,2-diethoxyethane, tetrahydrofuran, 1,2-dioxane, and 2-methyltetrahydrofuran; nitriles such as acetonitrile; Amides such as dimethylformamide may be used, but the present invention is not limited thereto. These can be used individually or in combination of two or more. In particular, a mixed solvent of a cyclic carbonate and a chain carbonate can be preferably used
- the gel polymer electrolyte which impregnated electrolyte solution in polymer electrolytes, such as polyethylene oxide and polyacrylonitrile, and inorganic solid electrolytes, such as LiI and Li3N, are possible.
- the separator may include an olefin-based polymer such as chemical-resistant and hydrophobic polypropylene; A sheet or nonwoven fabric made of glass fiber, polyethylene, etc. may be used.
- an olefin-based polymer such as chemical-resistant and hydrophobic polypropylene
- a sheet or nonwoven fabric made of glass fiber, polyethylene, etc. may be used.
- the solid electrolyte such as a polymer
- the solid electrolyte may also serve as a separator.
- Pitch was used as a carbon-based matrix
- pulverized silicon nanoparticles were used as metal-based nanoparticles
- flaky graphite was used as a conductive material.
- the pitch used had a fixed carbon of 70 to 80 wt%, and a softening point of 240 to 260°C.
- the pulverized silicon nanoparticles used had a D50 of 100 to 125 nm, and had an aspect ratio of more than 1.5 by weight of 90% by weight of the total weight.
- the scaled graphite used had a D50 of 7 to 9 ⁇ m.
- the negative active material, binder (SBR-CMC) and conductive material (Super P) of (1) were prepared so that the weight ratio of negative electrode active material: binder: conductive material was 75: 24: 1, added to distilled water, and uniformly mixed to make a slurry was prepared.
- the above slurry After uniformly coating the above slurry on a copper (Cu) current collector, it was compressed in a roll press and dried to prepare a negative electrode. Specifically, the loading amount was 5 mg/cm 2 , and the electrode density was 1.2 to 1.3 g/cc.
- Lithium metal (Li-metal) is used as the counter electrode, and 1 mol of LiPF6 is dissolved in a mixed solvent in which the volume ratio of ethylene carbonate (EC, ethylene carbonate): dimethyl carbonate (DMC, dimethyl carbonate) is 3:7 as the electrolyte. A dissolved solution was used.
- EC ethylene carbonate
- DMC dimethyl carbonate
- a CR 2032 half coin cell was manufactured according to a conventional manufacturing method using the negative electrode, lithium metal, and electrolyte.
- the negative active material prepared with the composition shown in Table 1 below was applied to each of the half-cells and tested.
- the initial efficiency was measured by driving the battery under the conditions of 0.1C, 0.005V, 0.05C cut-off charging and 0.1C, 1.5V cut-off discharge, and it is shown in Table 1 below.
- the long-term lifespan was measured through 50 charge/discharge under 0.5C (0.005V, 0.05C cut-off charge)/0.5C (1.5V cut-off discharge) conditions, and the results are shown. 1 is described.
- Expansion rate (%) (((thickness of electrode after 50th cycle - thickness of Cu collector) - (thickness of fresh electrode - thickness of current collector of Cu)) / (thickness of fresh electrode - thickness of current collector of Cu) ) * 100 (%)
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Abstract
Description
예 | 도전성 첨가제 | 복합체 내 분쇄형 실리콘 나노입자 대비 탄소 나노 튜브 함량 | 복합체 BET |
전기화학평가 | |||
m2/g | 용량 | 초기효율 | 50th 수명 | 50th 팽창률 | |||
중량% | 1400mAh/g 이상 | 85%이상 | 70%이상 | 55%이하 | |||
실시예 1 | 탄소 나노 튜브 | 0.50 | 4.06 | 1440.0 | 89.2 | 87.8 | 43.2 |
실시예 2 | 탄소 나노 튜브 | 1.00 | 4.32 | 1425.0 | 88.7 | 83.5 | 48.3 |
실시예 3 | 탄소 나노 튜브 | 1.50 | 4.61 | 1413.0 | 87.6 | 77.2 | 49.8 |
실시예 4 | 탄소 나노 튜브 | 2.00 | 4.86 | 1412.0 | 86.2 | 71.8 | 52.1 |
비교예 1 | 탄소 나노 튜브 | 2.50 | 5.85 | 1370.0 | 83.9 | 49.3 | 78.2 |
비교예 2 | 탄소 나노 튜브 | 0.00 | 6.21 | 1385.0 | 84.2 | 57.9 | 69.4 |
Claims (15)
- 탄소계 매트릭스; 및 상기 탄소계 매트릭스 내 담지된 금속계 물질 나노입자를 포함하는 복합체이고,상기 복합체 내 도전성 물질 및 도전성 첨가제를 더 포함하고,상기 도전성 물질은 인편상 흑연이고,상기 도전성 첨가제는 탄소 나노 튜브이고,상기 탄소 나노 튜브의 함량은, 복합체 내 금속계 물질 나노입자 대비 0.2 내지 2.3 중량%인, 리튬 이차전지용 음극 활물질.
- 제1항에 있어서,상기 금속계 물질 나노입자는 실리콘, 주석 및 알루미늄으로 이루어진 군에서 선택된 하나에서 유래된 것인, 리튬 이차전지용 음극 활물질.
- 제1항에 있어서,상기 금속계 물질 나노입자는 분쇄형 금속계 물질 나노입자인, 리튬 이차전지용 음극 활물질.
- 제3항에 있어서,상기 분쇄형 금속계 물질 나노입자는, 입도 D50이 30 내지 200 nm이고, 분쇄형 금속계 물질 나노입자 전체 중량의 90 중량% 이상의 종횡비가 1.5 초과인 침상형인, 리튬 이차전지용 음극 활물질.
- 제항에 있어서,상기 도전성 물질의 입도 D50은 3 내지 12㎛인, 리튬 이차전지용 음극 활물질.
- 분쇄 공정을 통해 금속계 물질을 금속계 물질 나노입자로 분쇄하는 단계;상기 분쇄된 금속계 물질 나노입자, 도전성 물질, 도전성 첨가제를 함께 구형화하여 구형화된 입자를 수득하는 단계;상기 구형화된 입자를 비정질 탄소계 전구체 물질과 복합화하여 복합체를 수득하는 단계; 및상기 복합체를 탄화시키는 단계;를 포함하고,상기 도전성 물질은 인편상 흑연이고,상기 도전성 첨가제는 탄소 나노 튜브이고,상기 탄소 나노 튜브의 함량은, 복합체 내 금속계 물질 나노입자 대비 0.2 내지 2.3 중량% 인, 리튬 이차전지용 음극 활물질의 제조방법.
- 제6항에 있어서,복합체를 수득하는 단계;는상기 구형화된 입자와 비정질 탄소계 전구체 물질을 건식 방법 또는 습식 방법으로 혼합하고 결착시키는 단계인, 리튬 이차전지용 음극 활물질의 제조방법.
- 제6항에 있어서,상기 비정질 탄소계 전구체 물질은 석탄계 피치, 석유계 피치 및 이들의 조합으로 이루어진 군에서 선택된 하나를 포함하는, 리튬 이차전지용 음극 활물질의 제조방법.
- 제6항에 있어서,상기 비정질 탄소계 전구체 물질은 고정탄소가 50 내지 85 중량%이고, 연화점이 300℃ 미만인, 리튬 이차전지용 음극 활물질의 제조방법.
- 제6항에 있어서,상기 금속계 물질은 실리콘, 주석 및 알루미늄으로 이루어진 군에서 선택된 하나인, 리튬 이차전지용 음극 활물질의 제조방법.
- 제6항에 있어서,상기 금속계 물질 나노입자는 분쇄형 금속계 물질 나노입자인, 리튬 이차전지용 음극 활물질의 제조방법.
- 제11항에 있어서,상기 분쇄형 금속계 물질 나노입자는, 입도 D50이 30 내지 200 nm이고, 분쇄형 금속계 물질 나노입자 전체 중량의 90 중량% 이상의 종횡비가 1.5 초과인 침상형인, 리튬 이차전지용 음극 활물질의 제조방법.
- 제6항에 있어서,상기 도전성 물질의 입도 D50은 3 내지 12㎛인, 리튬 이차전지용 음극 활물질의 제조방법.
- 제6항에 있어서,상기 복합체를 탄화시키는 단계;는800 내지 1000 ℃의 온도에서 0.5 내지 2 시간 동안 탄화시키는 단계인, 리튬 이차전지용 음극 활물질의 제조방법.
- 양극;음극; 및전해질을 포함하고,상기 음극은 제1항 내지 제5항 중 어느 하나의 항의 리튬 이차전지용 음극 활물질을 포함하는, 리튬 이차전지.
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US18/268,085 US20240038991A1 (en) | 2020-12-18 | 2021-12-17 | Metal-carbon composite anode material for lithium secondary battery, method for manufacturing same, and lithium secondary battery comprising same |
JP2023537404A JP2024500147A (ja) | 2020-12-18 | 2021-12-17 | リチウムイオン二次電池用金属系-炭素系複合負極材、その製造方法およびこれを含む二次電池 |
EP21907177.6A EP4266406A1 (en) | 2020-12-18 | 2021-12-17 | Metal-carbon composite anode material for lithium secondary battery, method for manufacturing same, and lithium secondary battery comprising same |
CN202180085738.0A CN116724423A (zh) | 2020-12-18 | 2021-12-17 | 锂二次电池用金属基-碳基复合负极活性物质、其制备方法、以及包含其的二次电池 |
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KR20160002281A (ko) * | 2014-06-30 | 2016-01-07 | 주식회사 지엘비이 | 전도성 물질에 분산된 나노실리콘과 탄소의 복합체로 구성된 리튬이온 이차전지용 음극활물질 및 그 제조방법 |
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US10629895B2 (en) * | 2014-02-06 | 2020-04-21 | Wacker Chemie Ag | Si/G/C-composites for lithium-ion-batteries |
US20200354222A1 (en) * | 2019-05-08 | 2020-11-12 | Eocell Limited | Silicon Carbon Nanocomposite (SCN) Material, Fabrication Process Therefor, and Use Thereof in an Anode Electrode of a Lithium Ion Battery |
KR102194750B1 (ko) * | 2020-01-21 | 2020-12-23 | 주식회사 그랩실 | 다층 구조의 음극 활물질, 이의 제조방법 및 이를 포함하는 리튬 이차전지 |
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- 2021-12-17 WO PCT/KR2021/019339 patent/WO2022131873A1/ko active Application Filing
- 2021-12-17 EP EP21907177.6A patent/EP4266406A1/en active Pending
- 2021-12-17 CN CN202180085738.0A patent/CN116724423A/zh active Pending
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JP6263823B2 (ja) * | 2012-11-30 | 2018-01-24 | エルジー・ケム・リミテッド | 負極スラリー、負極スラリーの製造方法及び二次電池 |
KR20140085822A (ko) * | 2012-12-27 | 2014-07-08 | 주식회사 포스코 | 리튬 이차 전지용 음극 활물질, 이의 제조 방법, 그리고 이를 포함하는 음극 및 리튬 이차 전지 |
US10629895B2 (en) * | 2014-02-06 | 2020-04-21 | Wacker Chemie Ag | Si/G/C-composites for lithium-ion-batteries |
KR20160002281A (ko) * | 2014-06-30 | 2016-01-07 | 주식회사 지엘비이 | 전도성 물질에 분산된 나노실리콘과 탄소의 복합체로 구성된 리튬이온 이차전지용 음극활물질 및 그 제조방법 |
US20200354222A1 (en) * | 2019-05-08 | 2020-11-12 | Eocell Limited | Silicon Carbon Nanocomposite (SCN) Material, Fabrication Process Therefor, and Use Thereof in an Anode Electrode of a Lithium Ion Battery |
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KR20220088221A (ko) | 2022-06-27 |
US20240038991A1 (en) | 2024-02-01 |
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