WO2018159870A1 - Matériau actif d'électrode négative pour batterie secondaire et procédé de fabrication associé - Google Patents

Matériau actif d'électrode négative pour batterie secondaire et procédé de fabrication associé Download PDF

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Publication number
WO2018159870A1
WO2018159870A1 PCT/KR2017/002237 KR2017002237W WO2018159870A1 WO 2018159870 A1 WO2018159870 A1 WO 2018159870A1 KR 2017002237 W KR2017002237 W KR 2017002237W WO 2018159870 A1 WO2018159870 A1 WO 2018159870A1
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WO
WIPO (PCT)
Prior art keywords
active material
negative electrode
electrode active
silicon
peak
Prior art date
Application number
PCT/KR2017/002237
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English (en)
Korean (ko)
Inventor
홍순호
Original Assignee
엠케이전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엠케이전자 주식회사 filed Critical 엠케이전자 주식회사
Publication of WO2018159870A1 publication Critical patent/WO2018159870A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/02—Silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • 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
    • 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
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • 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

  • Graphite which is a negative electrode active material widely used in a conventional lithium secondary battery, has a layered structure and thus has very useful characteristics for insertion and desorption of lithium ions.
  • Graphite theoretically has a capacity of 372 mAh / g, but as the demand for high capacity lithium batteries increases recently, a new electrode that can replace graphite is required. Accordingly, active research for commercialization of electrode active materials forming an electrochemical alloy with lithium ions such as silicon (Si), tin (Sn), antimony (Sb), and aluminum (Al) as a high capacity negative electrode active material is actively conducted. It is becoming.
  • the first mechanical alloying process comprises a vertical attrition milling apparatus, a horizontal attrition milling apparatus, a ball milling apparatus, a planetary milling apparatus, a vibration milling ( or a mechanical alloying process using a vibrational milling device, a Spex milling device, or a high energy milling device.
  • the coating material layer is too thin (for example, if the content of carbon contained in the negative electrode active material is less than 5 at%) it may not be sufficient to function as the buffer or the electrical path described above, the coating material If the thickness of the layer is too thick (e.g., the content of carbon contained in the negative electrode active material is greater than 20 at%), the discharge capacity may be small because the content of the silicon single phase which can act as an active region in the negative electrode active material becomes too small. have.
  • a mixture of the powders and a milling ball may be introduced into a milling vessel, and the powders may be ground and alloyed in a short time by milling energy.
  • the mixture of powders can be ground into fine powders with finer size.
  • fine forging, cold pressure welding, and crushing between the fine powders pulverized by the impact of rotation and impact of the milling ball may occur repeatedly.
  • an increase in interfacial energy becomes a driving force in the process of mixing fine powders, thereby promoting solid phase diffusion of atoms and generating fine alloying.
  • a negative electrode active material powder in which silicon, iron, and the first additive element are alloyed can be formed.
  • FIG. 2 is a flow chart illustrating a process of manufacturing a negative electrode active material according to exemplary embodiments.
  • Comparative Example 2 Comparative Example 2
  • the initial capacity of Comparative Example 2 (CO2) was about 1974 mAhg / g, which was significantly higher than other experimental examples, but showed a capacity retention of 74.6%.
  • Comparative Example 1 (CO1) having a second peak the initial capacity is 1414 mAh / g, but lower than Comparative Example 1 (CO1) it can be seen that the capacity retention characteristics are more excellent. That is, it can be seen that when the tetragonal silicon-metal alloy phase is present, it exhibits excellent capacity retention characteristics.

Abstract

L'invention concerne un matériau actif d'électrode négative pour une seconde batterie capable de fournir des caractéristiques de charge et de décharge à capacité élevée et à haut rendement. Le matériau d'électrode négative comprend une poudre de matériau actif d'électrode négative et une couche de matériau de revêtement entourant une surface de la poudre de matériau actif d'électrode négative. La poudre de matériau actif d'électrode négative comprend : une phase unique de silicium ; et une phase d'alliage silicium-métal entourant la phase unique de silicium tout en formant une interface avec la phase unique de silicium. Le matériau actif d'électrode négative contient 60 à 90 % at de silicium, 3 à 20 % at de fer, 0 à 5 % at d'un premier élément additif et 5 à 20 % at de carbone, le premier élément additif étant au moins un élément choisi dans le groupe constitué par le bore (B), le magnésium (Mg), l'aluminium (Al), le manganèse (Mn), le cobalt (Co), le chrome (Cr), l'étain (Sn), le molybdène (Mo), le niobium (Nb), le phosphore (P), le titane (Ti), le nickel (Ni), le cuivre (Cu), le zirconium (Zr) et le zinc (Zn), et la couche de matériau de revêtement contient du carbone.
PCT/KR2017/002237 2017-02-28 2017-03-02 Matériau actif d'électrode négative pour batterie secondaire et procédé de fabrication associé WO2018159870A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2017-0026481 2017-02-28
KR20170026481 2017-02-28

Publications (1)

Publication Number Publication Date
WO2018159870A1 true WO2018159870A1 (fr) 2018-09-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2017/002237 WO2018159870A1 (fr) 2017-02-28 2017-03-02 Matériau actif d'électrode négative pour batterie secondaire et procédé de fabrication associé

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WO (1) WO2018159870A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005011699A (ja) * 2003-06-19 2005-01-13 Canon Inc リチウム二次電池
KR20100014993A (ko) * 2008-08-04 2010-02-12 금호석유화학 주식회사 리튬 이차전지용 실리콘계 음극 활물질 복합재
KR20150110171A (ko) * 2014-03-24 2015-10-02 주식회사 휴엔스 리튬이온 이차전지의 음극 활물질용 Ｓｉ－Ｃｏ 합금 분말의 제조방법
KR20160059740A (ko) * 2014-11-19 2016-05-27 엠케이전자 주식회사 이차 전지용 음극 활물질 및 그 제조 방법
KR20160076950A (ko) * 2014-12-23 2016-07-01 삼성에스디아이 주식회사 음극 활물질 및 이를 채용한 리튬 전지

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005011699A (ja) * 2003-06-19 2005-01-13 Canon Inc リチウム二次電池
KR20100014993A (ko) * 2008-08-04 2010-02-12 금호석유화학 주식회사 리튬 이차전지용 실리콘계 음극 활물질 복합재
KR20150110171A (ko) * 2014-03-24 2015-10-02 주식회사 휴엔스 리튬이온 이차전지의 음극 활물질용 Ｓｉ－Ｃｏ 합금 분말의 제조방법
KR20160059740A (ko) * 2014-11-19 2016-05-27 엠케이전자 주식회사 이차 전지용 음극 활물질 및 그 제조 방법
KR20160076950A (ko) * 2014-12-23 2016-07-01 삼성에스디아이 주식회사 음극 활물질 및 이를 채용한 리튬 전지

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