초록 ▼

1. 리튬이차전지용 신규 양극/전해질 및 신규 전지시스템 기초·원천기술 개발
⦁고용량/고출력 양극소재: 5V급 금속산화물 합성
: 기존 Li-, Mn-rich NMC 소재의 문제점을 개선한 신규 표면물질이 형성된 신규 고용량/고출력/고율 양극소재 NSL-LLMO 개발. 1C대비 2C 용량을 약 90%로 향상 (110 mAh/g @ 30C, 300 cycle).

⦁장수명/고안전 양극소재: 5V급 인산염계 활물질 개발
: MetastrengiteⅠFePO4·2H2O로 합성된 LiFePO4(M-LFP)의 ta

1. 리튬이차전지용 신규 양극/전해질 및 신규 전지시스템 기초·원천기술 개발
⦁고용량/고출력 양극소재: 5V급 금속산화물 합성
: 기존 Li-, Mn-rich NMC 소재의 문제점을 개선한 신규 표면물질이 형성된 신규 고용량/고출력/고율 양극소재 NSL-LLMO 개발. 1C대비 2C 용량을 약 90%로 향상 (110 mAh/g @ 30C, 300 cycle).

⦁장수명/고안전 양극소재: 5V급 인산염계 활물질 개발
: MetastrengiteⅠFePO4·2H2O로 합성된 LiFePO4(M-LFP)의 tap density 및 에너지밀도를 향상시켜 수명 특성 개선(5,000회, 용량 80% 유지).

⦁ Time-resolved XRD+GC 방법에 의한 신소재 합성 기반기술 개발
: 전구체와 리튬염의 반응과 합성 온도에 따른 구조 변화를 관찰함.
: 원료에 따른 온도 상승 중 발생하는 혼합물 간 반응 경로를 실시간으로 관찰 가능함.

(출처 : 요약서 3p)

Abstract ▼

Ⅳ. Result and discussion
◯ High capacity / high voltage cathode material

◯ Synthesis of metal oxide cathode materials and improvement of performance characteristics
- Establishing Sol - gel synthesis method, optimize the transition metal composition of large - capacity Li -, Mn - rich

Ⅳ. Result and discussion
◯ High capacity / high voltage cathode material

◯ Synthesis of metal oxide cathode materials and improvement of performance characteristics
- Establishing Sol - gel synthesis method, optimize the transition metal composition of large - capacity Li -, Mn - rich NMC metal oxide, achieve the discharge capacity (4.8 V, 285 mAh / g)

◯ Synthesis of new metal oxide cathode materials
- NSL-LLMO development of new high-capacity / high-output / high-rate Cathode material with new surface material that improves the problems of existing Li- and Mn-rich NMC materials Improved 1C ratio 2C capacity to about 90% (110 mAh / g @ 30 C, 300 cycles)

◯ Establishment of basic and core technology of new material base through advanced analysis method
- In the initial synthesis state, bulk and surface crystal structure and atomic arrangement of new material particles are compared and analyzed through STEM and EDS mapping high-degree analysis.

- Electronic states and oxidation from the surface are known through numerical EELS analysis and suggesting the possibility that a highly conductive material of lithium ion has been produced

- The XAFS analysis of the accelerator base of the irradiated light accelerates the oxidation of each transition metal during charging and discharging and understands the main cause of the change of the number and the structural change

- Indirectly determining the material's thermal stability characteristics through TR-XRD measurements

- Detailed resistance analysis and degradation mechanism analysis of LiNixMnyCozO2

◯ Long life / high safe cathode material
◯ Synthesis and Improvement of Performance Characteristics of Phosphate-Based Oxide Electrode Material
- Improved tap density and energy density of LiFePO4 (M-LFP) synthesized with MetastrengiteⅠ(FePO4 · 2H2O) and improved lifetime characteristics (5,000 times, maintaining 80% capacity)

-In order to improve the conductivity of existing LFP, the structure of active material was improved by forming carbon nanotubes, chemical bonding, MnO2 and nanocomposite (CM-LFP)

-Development of new cathode materials using supercritical synthesis and improvement of high-rate characteristics by carbon coating

-Synthesis of a single phase Li3V2 (PO4) 3 / graphene nanocomposite material (190 mAh / g, high discharge capacity: 165 mAh / g @ 5C, lifetime) using sequential adsorption and spray drying Characteristics: 85% @ 1C, 100 cycles)

-Li3V2 (PO4) 3 / N-doping graphene nanocomposite

- Development and optimization of the Li2Co1-xFexPO4F sample using a sol-gel synthesis method to improve the lifetime characteristics

◯ Establishment of basic and core technology of new battery system through development of electrolyte and binder
- To develop a new water-based binder and electrolytic additive to achieve the long-life purpose.

◯ Establishment of basic and core technology of new material base through advanced analysis method
- Characterization of powders and electrochemical behavior of samples

- Analysis of the lattice structure of the electrode material, analysis of the lattice constants during HRPD / Rietveld refinement, and research on the state of structural order / disordered state.

◯ Time-resolved XRD + GC method to develop synthetic base materials for new materials

○ Added in situ X-ray diffraction (XRD) gas atmosphere adjustment function, added gas analysis function, developed new material synthesis base technology

- Reaction and degradation mechanism analysis using high-precision, real-time analysis technology

- It is designed and constructed to analyze the released gas ((N2, CH4, H2, O2, CO, CO2, etc.) as well as confirming the structural change that occurs during thermal decomposition of the cathode material.

- Observation of reaction of precursor and lithium salt and structural change by synthesis temperature.

- Real-time observation of the reaction path between the mixtures generated during the temperature rise by the raw materials

(출처 : SUMMARY 9p)

목차 Contents

• 표지 ... 1
• 제 출 문 ... 2
• 보고서 요약서 ... 3
• 요 약 문 ... 4
• S U M M A R Y ... 8
• C O N T E N T S ... 12
• 목차 ... 13
• 제 1 장 연구 배경 및 목표 ... 14
• 1. 연구개발대상 기술의 경제적·산업적 중요성 및 연구개발의 필요성 ... 14
• 2. 연구개발 목표 ... 16
• 제 2 장 국·내외 관련 동향 ... 19
• 1. 세계적 수준 ... 19
• 2. 국내 수준 ... 19
• 3. 국내·외 연구현황 ... 19
• 제 3 장 연구 결과 및 목표 달성도 ... 20
• 1. Li-, Mn-rich 계열 NCM 화합물 합성 및 성능특성 향상 ... 20
• 2. 고정밀, 고도 분석법을 이용한 전극 표면 열화 mechanism 규명 ... 39
• 3. LiFePO4 양극활물질 합성 및 이의 성능특성 향상 ... 42
• 4. LiMnPO4의 전이금속 치환 및 coating으로 인한 열화 및 전기화학적 특성 향상 ... 51
• 5. 불화계 양극활물질 합성 및 이의 성능특성 향상 ... 55
• 6. 고용량, 고전압 특성의 Li3V2(PO4)3/nano탄소 복합소재 개발 ... 76
• 7. 고용량 유황 양극소재 개발 ... 93
• 8. 고용량, 고출력 특성의 리튬이온전지 음극소재 개발 ... 95
• 9. 전극 표면층 SEI형성 및 전극수명에 관한 연구 ... 110
• 10. 전기화학적 기법에 의한 재료 내 불순물의 선택적 제거방법 제안 ... 114
• 11. Time-resolved XRD + GC 방법에 의한 신소재 합성 기반기술 개발: gas 분위기 조절 기능 추가 ... 115
• 제 4 장 목표달성도 및 관련분야에의 기여도 ... 130
• 1. 연구개발목표의 달성도 ... 130
• 2. 평가의 착안점에 따른 목표달성도에 대한 자체평가 ... 133
• 3. 연구 성과 ... 134
• 제 5 장 연구개발결과의 활용계획 ... 146
• 끝페이지 ... 149