Research Papers

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 450006, Henan, China
e-mail: chenlei904@126.com

Zhenyu Chen

School of Materials and Chemical Engineering,
Henan University of Engineering,
Zhengzhou 450006, Henan, China

Shuaishuai Liu

Center of Analysis and Testing,
Henan University of Engineering,
Zhengzhou 451191, Henan, China

Biaofeng Gao

School of Resource and Environment,
Henan University of Engineering,
Zhengzhou 451191, Henan, China

Junwei Wang

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

1Corresponding authors.

Manuscript received March 13, 2018; final manuscript received July 2, 2018; published online August 20, 2018. Assoc. Editor: Partha P. Mukherjee.

J. Electrochem. En. Conv. Stor. 15(4), 041011 (Aug 20, 2018) (5 pages) Paper No: JEECS-18-1025; doi: 10.1115/1.4040825 History: Received March 13, 2018; Revised July 02, 2018

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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Fig. 1

X-ray diffraction (XRD) patterns of LiFePO4 materials

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Fig. 2

Scanning electron microscopy images of LiFePO4 materials: (a) LFP-1, (b) LFP-2, (c) LFP-3, and (d) LFP-4

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Fig. 3

Particle size distribution curves of LiFePO4 materials

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Fig. 4

Charge-discharge voltage profiles of LFP-1 for CR2032 coin-type cell at different rates

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Fig. 5

Cycling properties of LiFePO4 materials at 1 C for CR2032 coin-type cell



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