Abstract:
PURPOSE: A solid electrolyte for a lithium secondary battery is provided to obtain LiBON solid electrolyte in a powdered form instead of a thin film form and to improve the stability of a battery. CONSTITUTION: A method for manufacturing a solid electrolyte for a lithium secondary battery comprises the steps of: mixing a boron precursor, a lithium precursor, and ammonia solution in an inert gas atmosphere, wherein the boron precursor is selected from the group consisting of B(OH)3, B2O3 and LiBO2 and the lithium precursor is selected from the group consisting of LiOH, LiNO3 and Li2O; and performing ammothermal reaction of the mixture at 70~200 °C to prepare a solid electrolyte of chemical formula 1.
Abstract:
본 발명은 리튬 분말과 실리카(SiO 2 ) 분말을 제공하는 단계; 상기 리튬 분말과 실리카 (SiO 2 ) 분말을 볼밀을 통하여 실리카의 산소가 리튬 분말로 전달되는 산소 교환반응 (single displacement)이 이루어져 나노 실리콘 (Si) 분말을 형성하는 단계; 상기 나노 실리콘 분말을 리튬산화물로부터 분리, 정제하는 단계;를 포함하는 리튬이차전지 음극 활물질용 나노 실리콘 분말의 제조방법의 제조방법 및 이에 의해 제조되는 나노 실리콘 분말을 제공한다. 본 발명에 의해 얻어지는 나노실리콘 분말은 매우 저가인 실리카를 이용하여 실리콘으로 합성함으로써 경제적인 장점이 있으며 또한 다양한 종류의 실리카를 반응물로 사용함으로써, 제조된 나노 실리콘 분말의 입자크기, 표면적, 기공 정도, 나노구조 등 의 물리화학적 특성을 조절 가능한 장점이 있어 이차전지용 음극에 사용되는 적합한 재료를 제공할 수 있다.
Abstract:
The present invention relates to a nanosilicon based compound-graphene-carbon fiber composite which is obtained by producing nanosilicon based compound powder by oxygen exchange reaction (single displacement) of transferring oxygen of silica to lithium through making lithium powder react with silica powder, and producing graphene and carbon fibers; a production method thereof; and a lithium secondary battery including a negative electrode active material which contains the nanosilicon based compound-graphene-carbon fiber composite.
Abstract:
PURPOSE: A manufacturing method of a negative electrode active material is provided to manufacture a negative electrode active material which can minimize the volume change during charging and discharging, and can improve battery lifetime by a cost-effective method. CONSTITUTION: A manufacturing method of a negative electrode active material comprises: a step of mixing lithium metal powder and silicon oxide powder(SiOx, where 1
Abstract:
PURPOSE: A secondary battery is provided to prevent capacity reduction and to improve charging and discharging performance and lifetime by using a negative electrode active material with a siloxane layer formed on the surface of a silicon-based particle, and electrolyte which comprises a silane-based compound together. CONSTITUTION: A secondary battery comprises a negative electrode which comprises: a negative electrode active material containing a silicon-based particle and a siloxane layer which is formed on the surface of the particle; a positive electrode; an electrolyte which comprises a first silane-based compound; and a separator. The silicon-based particle is selected from Si, Si-M alloy, SiOx, Si-carbon, Si-M-carbon, and SiOx-carbon. In Si-M alloy, M is one or more metals selected from Ni, Cu and Fe. In SiOx, 0.3ΔxΔ1.5. In Si-M-carbon, M is one or more metals, M is one or more metal selected from Ni, Cu and Fe. In SiOx-carbon, 0.3ΔxΔ1.5. [Reference numerals] (AA) Self-formation; (BB) Surface layer formation