Porous Supraparticles of LiFePO4 Nanoparticles for High Rate Li-Ion Batteries

다국어 초록 (Multilingual Abstract)

Porous supraparticles, or spherical aggregate of LiFePO4 (LFP) nanoparticles with carbon were prepared by spraying LFP nanoparticles and glucose and drying under hot carrier gas. Rod-like LFP (R-LFP) and plate-like LFP (P-LFP) nanoparticles are prepared by solvothermal process, which were then sprayed with glucose as a carbon source forming spherical particles of LFP nanoparticles and glucose. Through the heat treatment under nitrogen atmosphere, glucose was carbonized inside supraparticles. Due to the interstices between nanoparticles and micropores in carbon coating, the supraparticles showed fairly high specific surface area (R-LFP supraparticle = 35.0104 m2g-1, P-LFP supraparticle = 32.5406 m2g-1). Supraparticles-based cathode exhibited fairly high discharging capacity and extremely high c-rate performance; Discharging capacity of P-LFP was 137.56 mAhg-1 at high 10C (1430.80 mA/g) and 116.75 mAhg-1 at 50C (7154 mA/g), as well as R-LFP was 134.12 mAhg-1 at 10C and 108.52 mAhg-1 at 50C. In addition, those porous R-LFP/C supraparticles have higher packing density or tap density (1.07 g/cm3) than LFP/C nanoparticle (0.78 g/cm3), which is considered as important factor for commercialization.

목차 (Table of Contents)

• Table of Contents
• Table of Contents i
• List of Schemes ii
• List of Figures iii
• Abstract 1
• 1. Introduction 2
• 2. Experimental Section 6
• 2.1. Preparation of LiFePO4 Nanoparticle. 6
• 2.2. Spray-drying LiFePO4 Nanoparticles and Glucose. 6
• 2.3. Characterization. 6
• 2.4. Electrochemical Measurement. 7
• 3. Results and Discussions. 8
• 3.1. Solvothermal synthesis of rod-like LFP nanoparticles 8
• 3.2. Supraparticles of rod-like LFP nanoparticles and carbon by spray-drying 14
• 3.3. High-rate Li-ion secondary batteries 21
• 4. Conclusions 24
• Reference 25
• 초 록 27