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소개 및 활동/사업
대한화학회 창립 75주년
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09월 20일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제126회 대한화학회 학술발표회 및 총회
Characteristics and Electrochemical Performance of Silicon/Carbon nanofibers/Graphene Composite films as Anode Material for Binder-Free Lithium ion Secondary Batteries
2020년 9월 3일 16시 53분 52초
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10월 21일(수) 17:00~17:30
, Jin-Yeong Choi
, Chang-Seop Lee
Analytical chemistry, Keimyung University, Korea
Department of Chemistry, Keimyung University, Korea
We report the interfacial study of a Silicon/Carbon nanofiber/Graphene Composite material as a potentially high performance anode for rechargeable lithium ion batteries. Carbon Nanofibers (CNFs) were grown using an iron-copper catalysts by the Chemical Vapor Deposition method. Silicon nanoparticles (SiNPs)/Carbon nanofibers (CNFs)/reduced Graphene oxide (rGO) composite films were prepared by simple physical filtration and an environmentally friendly thermal reduction treatment. The films were used as a high performance anode material for self-supporting, binder-free lithium ion batteries. The Silicon nanoparticles were uniformly coated with thermally reduced Graphene oxide (rGO), carbon nanofibers are wound round the surface of the graphene-coated silicon nanoparticles. Reducing graphene oxide has the effect of improving electron conductivity and accommodating volume change during repeated charge/discharge processes. Carbon nanofibers can help maintain structural stability and prevent detachment of silicon nanoparticles from the electrodes. When the produced Si:CNFs/rGO=1:1 composite films was used as an anode of a lithium ion batteries, the initial specific capacity was measured to be 1,894.54 mAh/g at a current density of 0.1 A•g
. After 100 cycles, the reversible specific capacity can be remained at 964.68 mAh/g, the coulombic efficiency can be reached to 93.8% at the same current density. In addition, the SiNPs/CNFs/rGO composite films electrode exhibited a better high specific capacity and cycle stability than an SiNPs/rGO composite films electrode (the reversible specific capacity is 277.28 mAh/g after 100 cycles), the Si:CNFs/rGO=3:2 electrodes (the reversible specific capacity is 545.9 mAh/g after 100 cycles) and the Si:CNFs/rGO=2:3 electrode (the reversible specific capacity is 462.9 mAh/g after 100 cycles). The SiNPs/CNFs/rGO composite films can effectively accommodate and buffer changes of silicon volume, form a stable Solid Electrolyte Interface (SEI), improve the conductivity of the electrode and provide a fast and efficient channel for electron conduction and ion transport. This technology shows a great promise for the application of anode materials in the field of lithium ion batteries.
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