Titles:
Negative electrode material and preparation method thereof, negative electrode pole piece and lithium ion battery
负极材料及其制备方法、负极极片以及锂离子电池
Abstracts:
The application relates to the battery field, and relates to a negative electrode material and a preparation method thereof, a negative electrode pole piece and a lithium ion battery. The composite precursor containing the silicon oxide particles and the cross-linked polymer is calcined in a protective atmosphere, the cross-linked polymer is carbonized and coated on the surface of the silicon oxide particles to form nanocomposite particles, and the silicon oxide is locked in In the molecular cavity formed by the cross-linked polymer. The geometric constraint of the molecular cavity prevents the formation of large particles of SiO, making SiO form smaller particles, and the cross-linked polymer is calcined and carbonized into a carbon layer coated on the surface of the small particles of SiO, which further prevents the formation of small particles. The agglomeration of SiO enables the particle size of the carbon-coated silicon oxide material to reach the nanometer level. Such nano-scale particles are used as a negative electrode material to reduce the volume expansion of SiO during charging and discharging, increase the diffusion rate of Li+, make the deintercalation reaction of Li+ proceed more fully, and improve the battery capacity cycle stability.
Provided is a secondary battery comprising a positive electrode, a negative electrode, and an electrolyte, the negative electrode including a carbon material, a first silicon-containing material, and a second silicon-containing material, wherein the first silicon-containing material contains a silicate phase and a first silicon phase dispersed in the silicate phase, and the second silicon-containing material contains a carbon phase and a second silicon phase dispersed in the carbon phase.
Titles:
NEGATIVE ELECTRODE FOR SECONDARY BATTERY, AND SECONDARY BATTERY INCLUDING SAME
이차전지용 음극 및 이를 포함하는 이차전지
Abstracts:
The present invention relates to a negative electrode for a secondary battery, and a secondary battery including same. The negative electrode comprises a composite material layer having a double-layer structure, but includes silicon oxide and carbon nanotubes in only one layer, such that it is possible to increase the capacity of a battery while preventing structural deterioration of the negative electrode due to changes in electrode volume during charging and discharging.
본 발명은 이차전지용 음극 및 이를 포함하는 이차전지에 관한 것으로, 이중층 구조의 합재층을 포함하되, 하나의 층에만 규소 산화물과 탄소나노튜브를 포함하도록 하여 충방전시 전극 부피변화에 따른 음극의 구조적 퇴화를 방지하면서 전지의 용량을 증가시킬 수 있는 효과가 있다.
Applicant:
LG ENERGY SOLUTION LTD [KR] (주식회사 엘지에너지솔루션)
Inventors:
SUNG KI WON [KR] (성기원)
LEE EUN JU [KR] (이은주)
KIM JU RI [KR] (김주리)
Other family members:
KR 20210123480 A,
Pub. Date: 2021-10-14,
EPO/ Google
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