Excellent electrochemical performance of LiFe_0.4Mn_0.6PO₄microspheres produced using a double carbon coating process

Abstract

Composite LiFe 0.4 Mn 0.6 PO 4 /C microspheres are considered advanced cathode materials for electric vehicles and other high-energy density applications due to their advantages of high energy density and excellent cycling stability. LiFe 0.4 Mn 0.6 PO 4 /C microspheres have been produced using a double carbon coating process employing traditional industrial techniques (ball milling, spray-drying and annealing). The obtained LiFe 0.4 Mn 0.6 PO 4 microspheres exhibit a high discharge capacity of around 166 mA h g À1 at 0.1 C and excellent rate capabilities of 132, 103, and 72 mA h g À1 at 5, 10, and 20 C, respectively. A reversible capacity of about 152 mA h g À1 after 500 cycles at a current density of 1 C indicates an outstanding cycling stability. The excellent electrochemical performance is attributed to the micrometer-sized spheres of double carbon-coated LiFe 0.4 Mn 0.6 PO 4 nanoparticles with improved electric conductivity and higher Li ion diffusion coefficients, ensuring full redox reactions of all nanoparticles. The results show that the advanced high-energy density cathode materials can be produced using existing industry techniques.

Preparation of Enhanced‐Performance LiMn0.6Fe0.4PO4/C Cathode Material for Lithium‐Ion Batteries by using a Divalent Transition‐Metal Phosphate as an Intermediate

“…Chen et al. produced LiMn 0.6 Fe 0.4 PO 4 /C microspheres using oxalates and a spray‐drying method, which showed a reversible capacity of about 152 mAh g −1 after 500 cycles at 1 C, indicative of outstanding cycle stability . Sun et al.…”

“…[22] Chen et al produced LiMn 0.6 Fe 0.4 PO 4 /C microspheres using oxalates and as pray-drying method, which showed ar eversible capacity of about 152 mAh g À1 after 500 cycles at 1C, indicative of outstanding cycle stability. [23] Sun et al synthesized LiMn 0.5 Fe 0.5 PO 4 /C microsized spheres using coprecipitated phosphate as precursor,w hich retained 85 %o ft heir capacity at 55 8C. [24] Herein, we report af acile way to synthesize at wo-component LiMn 0.6 Fe 0.4 PO 4 /C composite, denoted LMFP/C.…”

Ionic Liquid Assisted Electrospinning of Porous LiFe0.4Mn0.6PO4/CNFs as Free‐Standing Cathodes with a Pseudocapacitive Contribution for High‐Performance Lithium‐Ion Batteries

“…In this work we chose LiFe 0.4 Mn 0.6 PO 4 (LFMP) as a model material to demonstrate the IL‐assisted electrospinning strategy that is capable of improving the electrochemical performance by facilitating efficient electron and ion transport. As a member of phosphate‐based polyanion cathode family, LFMP inherits the advantages of high voltage platform from LiMnPO 4 (LMP) and high stability from LiFePO 4 (LFP), but still suffers from the intrinsically poor electronic and ionic conductivity . The porous LFMP/CNF free‐standing cathode with N‐doped carbon coating was successfully achieved by IL‐assisted electrospinning method.…”

Characterization of microinjection molding process for milligram polymer microparts

“…Based on Screw Velocity. Proper determination of switchover from velocity control in the filling stage to pressure control in the holding stage can reduce defects from overpacking and underpacking, such as flash, sticking to mold, breakage due to higher residual stress, sink marks, and underweight [26]. Switchover time, 10 ms, is much shorter than the filling time for CIM and is usually ignored.…”