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

Abstract

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.

Impact of Particle Size Distribution on Performance of Lithium‐Ion Batteries

“…On the positive electrode, there have been several works reported that different PSD influence the battery performance, impedance behavior and processing properties. [44][45][46] So far, most investigations on the impact of particle size and PSD were only conducted by simulation, probably due to difficulties in experimentally producing defined PSD at a certain mean particle size and resulting electrodes. Since these modelbased studies have clearly shown that the particle size and PSD on the negative electrode in LIB has a significant impact on LIB performance and aging behavior, we think it is of high importance for improving battery performance to conduct more systematic experimental investigations.…”

“…They found out that the cycle life is impacted by different PSD of red phosphorus, where the smaller particle fraction in the range of 2 μm to 10 μm improves the cycle life. On the positive electrode, there have been several works reported that different PSD influence the battery performance, impedance behavior and processing properties [44–46] …”

Lithium-ion battery multi-scale modeling coupled with simplified electrochemical model and kinetic Monte Carlo model

“…For the MP-SEM, particle size distribution is important. Therefore, the particle sizes of the model are set based on the results of the references: D 10, D 50, and D 90 are set to 0.42 μm, 0.74 μm, and 2.79 μm for cathode, 54 and 4.9 μm, 13.3 μm, and 28.8 μm for anode, 55 respectively. The simulation conditions were still set to 1C constant current discharge and charge to facilitate comparison with the results mentioned previously.…”

Material Optimization Engineering toward xLiFePO4·yLi3V2(PO4)3 Composites in Application-Oriented Li-Ion Batteries

“…They provide an opportunity for LIBs to achieve a higher power density with a considerable energy density. In practice, the compacted density is a critical parameter of battery design, and the volumetric energy density of the battery can be indicated directly by the compacted density of electrode pieces, which is determined by the size distribution of active material [ 23 , 24 ], the components of electrode pieces, and the imposed pressure from roller machine [ 25 ].…”