Performance Improvement of Lithium Manganese Phosphate by Controllable Morphology Tailoring with Acid-Engaged Nano Engineering

Abstract

Olivine-type lithium manganese phosphate (LiMnPO4) has been considered as a promising cathode for next-generation Li-ion batteries. Preparation of high-performance LiMnPO4 still remains a great challenge because of its intrinsically low Li-ion/electronic conductivity. In this work, significant performance enhancement of LiMnPO4 has been realized by a controllable acid-engaged morphology tailoring from large spindles into small plates. We find that acidity plays a critical role in altering the morphology of the LiMnPO4 crystals. We also find that size decrease and plate-like morphology are beneficial for the performance improvement of LiMnPO4. Among the plate-like samples, the one with the smallest size shows the best electrochemical performance. After carbon coating, it can deliver high discharge capacities of 104.0 mAh g(-1) at 10 C and 85.0 mAh g(-1) at 20 C. After 200 cycles at 1 C, it can still maintain a high discharge capacity of 106.4 mAh g(-1), showing attractive applications in high-power and high-energy Li-ion batteries.

Deep Eutectic Solvent Synthesis of LiMnPO4/C Nanorods as a Cathode Material for Lithium Ion Batteries

“…The values of the cell volume ( V ) and the lengths ( a , b and c ) of both samples are close to those in previous studies [65,66]. The values of the lattice parameters of LMP are close to those of LMP/C, indicating that the annealing process has little influence on the lattice parameters.…”

Developing a Diamine-Assisted Polymerization Method To Synthesize Nano-LiMnPO4 with N-Doped Carbon from Polyamides for High-Performance Li-Ion Batteries

“…Meanwhile, stoichiometric LiMnPO 4 (denoted as SLMP) is synthesized with enhanced LiOH concentration. It is known that the pure nonstoichiometric LiMnPO 4 is very rare because the reaction with excess LiOH will precipitate Li 3 PO 4, and the reaction with low LiOH generally has impurities, like Mn 2 P 2 O 7 and MnHPO 4 . − Therefore, LiMnPO 4 was analyzed by synchrotron X-ray to ensure the quantification reliable, as shown in Figure . Both XRD patterns do not reveal Li 3 PO 4 at 10.26°.…”

Revisiting Olivine Phosphate and Blend Cathodes in Lithium Ion Batteries for Electric Vehicles

“…However, lithium ion diffusion kinetics and electronic conductivity in LiMnPO 4 is even worse than LiFePO 4 and hard to prepare the pure phase with high performance [19,20]. Morphology control and particle size reduction are effective solutions to improve the sluggish kinetics property referencing from LiFePO 4 development [21]. A facile polyol synthesis approach is developed to prepare well-crystallized LiMnPO 4 with ~30 nm thick nanoplates (as shown in Figure 2) [22].…”