Significance of the particle size distribution modulus for strain-hardening-ultra-high performance concrete (SH-UHPC) matrix design

2020 ◽  
Vol 234 ◽  
pp. 117423 ◽  
Author(s):  
Ketan Ragalwar ◽  
William F. Heard ◽  
Brett A. Williams ◽  
Ravi Ranade
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Strain Hardening ◽  
Size Distribution ◽  
High Performance ◽  
High Performance Concrete ◽  
Ultra High Performance Concrete ◽  
Matrix Design

Effects of Particle Size Distribution on Compacted Density of Lithium Iron Phosphate 18650 Battery

2018 ◽  
Vol 15 (4) ◽  
Author(s):  
Lei Chen ◽  
Zhenyu Chen ◽  
Shuaishuai Liu ◽  
Biaofeng Gao ◽  
Junwei Wang
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
High Performance ◽  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
Specific Discharge ◽  
Average Size ◽  
Discharge Capacities ◽  
Selection Of

The effects of particle size distribution on compacted density of as-prepared spherical lithium iron phosphate (LFP) LFP-1 and LFP-2 materials electrode for high-performance 18650 Li-ion batteries are investigated systemically, while the selection of two commercial materials LFP-3 and LFP-4 as a comparison. The morphology study and physical characterization results show that the LFP materials are composed of numerous particles with an average size of 300–500 nm, and have well-developed interconnected pore structure and a specific surface area of 13–15 m2/g. For CR2032 coin-type cell, the specific discharge capacities of the LFP-1 and LFP-2 are about 165 mAh/g at 0.2 C. For 18650 batteries, results indicate that the LFP-3 material has the highest compacted density of 2.52 g/cm3 at a concentrated particle size distribution such as D10 = 0.56 μm, D50 = 1.46 μm, and D90 = 6.53 μm. By mixing two different particle sizes of LFP-1 and LFP-2, the compaction density can be increased significantly from 1.90 g/cm3 to 2.25 g/cm3.

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