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research-article

Effects of particle size distribution on compacted density of lithium iron phosphate 18650 battery

[+] Author and Article Information
Lei Chen

School of Materials and Chemical Engineering, Henan University of Engineering, Zhengzhou, Henan 450006, China
chenlei904@126.com

Zhenyu Chen

School of Materials and Chemical Engineering, Henan University of Engineering, Zhengzhou, Henan 450006, China
czy-0509@163.com

Shuaishuai Liu

Center of Analysis and Testing, Henan University of Engineering, Zhengzhou, Henan 451191, China
ssliu@haue.edu.cn

Biaofeng Gao

School of Resource and Environment, Henan University of Engineering, Zhengzhou, Henan 451191, China
saron2@163.com

Junwei Wang

College of Chemistry and Chemical Engineering, Anqing Normal University, Anqing, Anhui 246011, China
wangjunweilotus@163.com

1Corresponding author.

ASME doi:10.1115/1.4040825 History: Received March 13, 2018; Revised July 02, 2018

Abstract

The effects of particle size distribution on compacted density of as-prepared spherical lithium iron phosphate 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 0.2C. 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,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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