Optimizing the particle-size distribution and tap density of LiFePO4/C composites containing excess lithium
- 19 Downloads
LiFePO4 is a promising cathode material for lithium-ion batteries, but its inferior tap density leads to low-volumetric energy density of Li-ion batteries. This work reports that lithium amount can tune the particle-size distribution and tap density of the Li1 + xFePO4/C (x = 0–0.16) composites prepared via a wet chemistry method followed by carbon thermal reduction reaction. Excess lithium effectively prevents the agglomeration of primary particles, tunes the particle-size distribution, and thus improves the tap density of Li1 + xFePO4/C composite. The charge transfer resistance of the Li1 + xFePO4/C composite decreases with the increase of lithium amount. The Li1 + xFePO4/C composite with x = 0.12 exhibits a high tap density of 1.55 g cm−3 and a discharge capacity of 156 mAh g−1 at 0.1 C. Therefore, the tap density and electrochemical performance of LiFePO4/C composite could be conveniently tuned by lithium amount, indicating a facile and promising technique for LiFePO4/C composite preparation.
KeywordsLi-ion batteries Cathodes Materials preparations
This study was funded by the Natural Science Foundation of Hubei Province of China (grant number 2017CFB688).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 9.Zheng ZM, Tang XC, Wang Y, Jin Y, Meng J, Liu WM, Wang T (2015) Solvothermal synthesis and electrochemical performance of flowerlike LiFePO4 hierarchically microstructures. Chinese J Inorg Chem 31:731–738Google Scholar
- 11.Wu YN, Zhou L, Xu GQ et al (2017) Synthesis and electrochemical properties of cake-like LiFePO4/C with high tap density. Chinese J Inorg Chem 33:1423–1428Google Scholar