Abstract ▼

Purpose & contents
Instead of using commercialized LiCoO₂, which is costly and relatively unsafe, olivine structure LiMnPO₄ as attracted much attention as a potential cathode material because of the operation voltage of 4.1 V, its extremely high structural stability, and hig

Purpose & contents
Instead of using commercialized LiCoO₂, which is costly and relatively unsafe, olivine structure LiMnPO₄ as attracted much attention as a potential cathode material because of the operation voltage of 4.1 V, its extremely high structural stability, and high theoretical capacity (~170mAh g^-1. In order to utilize LiMnPO₄ as a future electrode material for HEV/PHEV application, this project focuses on improving ionic/electronic conduction of this material.
Result
Our research team studied the origin of poor ionic/electronic conduction of LiMnPO₄ using first-principle calculation. Using first-principle calculation, the electron distribution of ground state which is not observed at an experiment can be calculated at first-principle calculation and then, we can predict the several properties of LiMnPO₄. By using the calculated propertie, we can find the optimal conditions such as doping some transition metals and nano-structure for improving the movement of polaron in LiMnPO₄ related to the conductivity of LiMnPO₄. And these conditions are applied to synthesizing the improved LiMnPO₄ for acquisition of the technique of making highly efficient Li rechargeable batteries.
Expected Contribution
LiMnPO₄ is safer and cheaper than commercialized LiCoO₂. and considered to be the best candidate among all olivine cathode materials due to Mn²⁺/Mn³⁺ redox potential of ~4.1V vs. Li⁺/Li. Therefore, Because this problem of the poor conductivity of LiMnPO₄ is solved by our study, this battery system can be not only applied to new generation HEV/PHEV energy storage system, but also replace the existing small portable energy storage system.

목차 Contents

• 일반연구자지원사업 최종보고서 ... 1
• 목 차 ... 3
• Ⅰ. 연구 계획 요약문 ... 4
• 1. 국문 요약문 ... 4
• Ⅱ. 연구 결과 요약문 ... 5
• 1. 한글요약문 ... 5
• 2. SUMMARY ... 6
• Ⅲ. 연구 내용 및 결과 ... 7
• 1. 연구개발과제의 개요 ... 7
• 2. 국내외 기술개발 현황 ... 10
• 3. 연구수행 내용 및 결과 ... 11
• 4. 목표 달성도 및 관련 분야에의 기여도 ... 40
• 5. 연구결과의 활용계획 ... 41
• 6. 연구과정에서 수집한 해외과학기술정보 ... 41
• 7. 주관연구책임자(공동연구원) 대표적 연구 실적 ... 41
• 8. 참고 문헌 ... 42
• 9. 연구 성과 ... 42
• 10. 기타사항 ... 45