초록

본 과제에서는 Sn, Si등의 고용량 리튬이차전지용 음극재와 그래핀을 복합화하여 고성능 음극재를 제조하는 것을 그 목표로 함. 리튬저장에 영향을 미치는 요소를 파악하기 위해 Sn, Si와 그래핀을 다양한 구조로 제조하였으며 형태에 따른 리튬이온저장 거동을 분석. 이를 통해 최종적으로 샌드위치형 Si@C-graphene 구조를 가진 최적소재를 개발하였으며 해당 소재는 400회 충방전 이후 93%의 용량 유지율을 보이는 등 세계적 수준의 성능을 구현함.
(출처 : 보고서 요약서 3P)

Abstract ▼

Ⅱ. Purpose of research

- Development of high capacity graphene-based composite anode material for large scale Li rechargeable batteries
Target materials : Si, Sn/graphene composites in the form of particle, fiber, tube, core-shell
Discharge capacity : > 1000 mAh/g
Initial coulombic e

Ⅱ. Purpose of research

- Development of high capacity graphene-based composite anode material for large scale Li rechargeable batteries
Target materials : Si, Sn/graphene composites in the form of particle, fiber, tube, core-shell
Discharge capacity : > 1000 mAh/g
Initial coulombic efficiency : 80%
Rate capability : C(2C)/C(0.2C) > 75%

Ⅲ. Research contents and range

- Development of Hummer's method for large-scale synthesis of graphene Large-scale synthesis of graphene using Hummer's method

- Development of synthetic method for particle-type Si, Sn/graphene composite materials Synthesis of particle-type Si, Sn/graphene composite materials using precipitation method Clarification of electrochemical properties and charge/discharge mechanism for the optimized particle-type Si, Sn/graphene composite materials

- Development of synthetic method for fiber-type Si, Sn/graphene composite materials Synthesis of fiber-type Si, Sn/graphene composite materials using electrospinning method Clarification of electrochemical properties and charge/discharge mechanism for the optimized fiber-type Si, Sn/graphene composite materials

- Development of synthetic method for tube or core/shell-type Si, Sn/graphene composite materials Synthesis of tube or core/shell-type Si, Sn/graphene composite materials using electrospinning method with double inlet Clarification of electrochemical properties and charge/discharge mechanism for the optimized tube or core/shell-type Si, Sn/graphene composite materials

- Full-cell test for the optimized Si, Sn/graphene composite materials

Ⅴ. 연구개발성과의 활용계획

- It has been couple of years from the fist report that silicon has high Li ion storage capacity, however, there were very limited reports to adopt silicon as anode material for real batteries. Herein, we reported Si@C-graphene composite that able to improve existing problems like volume expansion or low initial coulombic efficiency.

- Our utilization plan from academic point is like below. Herein, our research on make an structure with graphene and Si, Sn can be helpful to expand its range to other alloy-based high capacity materials. We will conduct further research on other materials like Sb which have relatively higher possibility for real battery anode.

- Our Si@C-graphene composite has been published and discussed about commercialization with some company. If the commercialization is proceeding, we will transfer the technology with further research.
(출처 : SUMMARY 6P)

목차 Contents

• 표지 ... 1제 출 문 ... 2보고서 요약서 ... 3요 약 문 ... 4SUMMARY ... 6CONTENTS ... 8목차 ... 9제1장 연구개발과제의 개요 ... 10 제1절 연구개발대상의 중요성 및 연구개발의 필요성 ... 10제2장 국내외 기술개발 현황 ... 12 제1절 세계적 수준 ... 12 제2절 국내수준 ... 12 제3절 국내외 연구현황 ... 13제3장 연구개발수행 내용 및 결과 ... 14 제1절 연구개발 수행내용 ... 14 제2절 연구개발내용 ... 14 제3절 정량적 연구성과 ... 34제4장 목표달성도 및 관련분야에의 기여도 ... 51 제1절 목표달성도 ... 51 제2절 관련분야에의 기여도 ... 51제5장 연구개발성과의 활용계획 ... 52제6장 연구개발과정에서 수집한 해외과학기술정보 ... 53제7장 연구시설ㆍ장비 현황 ... 54제8장 참고문헌 ... 55끝페이지 ... 56