표제지

목차

요약 9

Abstract 10

제1장 서론 12

제2장 이론적 배경 15

2.1. 리튬이온전지(Lithium Ion Battery) 15

2.2. High-Ni계 양극 소재 18

2.3. 양이온 혼합(Cation mixing) 22

제3장 실험방법 24

3.1. 양극 소재 합성 24

3.1.1. Mixing 공정 24

3.1.2. Calcination 조건 25

3.2. Annealing 26

3.2.1. Ar flow Annealing 26

3.2.2. O₂ flow Annealing 26

3.3. 전기화학 특성 평가 27

3.4. Analysis 28

제4장 결과 및 고찰 31

4.1. Calcination condition 31

4.2. Annealing 42

제5장 결론 58

제6장 참고문헌 60

Table. 1. An amount of LiOH/Li₂CO₃ according to post annealing of LiNi0.925Co0.05Mn0.025O2 cathode active materials[이미지참조] 57

Fig. 2.1. Schematic representation of the lithium ion battery 17

Fig. 2.2. Layered structure of cathode active material 20

Fig. 2.3. Compositional phase diagrams of high-Ni NCM 21

Fig. 3.1. Schematic representation of pH measurement 30

Fig. 4.1. SEM images of synthesized high-Ni NCM precursors with various ratio (a) NCM(8/1/1) (b) NCM(85.9/6.5/7.7)... 33

Fig. 4.2. SEM images of growth process of high-Ni NCM precursors with (a) 24h (b) 48h (c) 72h (d) 96h (e) 120h (f) 144h 34

Fig. 4.3. Discharge capacities of LiNi0.859Co0.063Mn0.077O2 with various Li/M ratio (a) 1.0 (b) 1.03 (c) 1.06 (d) 1.09[이미지참조] 36

Fig. 4.4. SEM images of synthesized high-Ni NCM cathode active materials with various ratio (a) LiNi0.8Co0.1Mn0.1O2...[이미지참조] 39

Fig. 4.5. Discharge capacities and calcination temperatures of high-Ni NCM cathode active materials with various Ni ratio 80%~92.5% 41

Fig. 4.6. XRD patterns of LiNi0.925Co0.05Mn0.025O2 cathode active materials with post annealing (a) Reference (b) Ar 300℃...[이미지참조] 43

Fig. 4.7. SEM images of LiNi0.925Co0.05Mn0.025O2 cathode active materials with post annealing (a) Reference (b) Ar 300℃...[이미지참조] 45

Fig. 4.8. Charge-discharge behaviors of LiNi0.925Co0.05Mn0.025O2 cathode active materials with post annealing (a) Reference...[이미지참조] 47

Fig. 4.9. cycle-performances of LiNi0.925Co0.05Mn0.025O2 cathode active materials with post annealing (a) Reference (b) Ar 300℃...[이미지참조] 49

Fig. 4.10. pH measurement of LiNi0.925Co0.05Mn0.025O2 cathode active materials with post annealing (a) Reference (b) Ar 300℃...[이미지참조] 52

Fig. 4.11. ICP analysis of LiNi0.925Co0.05Mn0.025O2 cathode active materials with post annealing (a) Reference (b) Ar 300℃...[이미지참조] 54

Fig. 4.12. Titration of LiNi0.925Co0.05Mn0.025O2 cathode active materials with post annealing (a) Reference (b) Ar 300℃...[이미지참조] 56