Influence of integrated microstructure on the performance of LiNi_0.8Co_0.15Al_0.05O₂ as a cathodic material for lithium ion batteries

Abstract

An integrated network of LiNi0.8Co0.15Al0.05O2 spheres may accumulate the stress generated during cycling to maintain the stability of the microstructure.

Synthesis and electrochemical performance of ropelike LiNi0.8Co0.15Al0.05O2 fiber with nano-building blocks

“…The coulombic efficiency of the first cycle was relatively low, suggesting a large irreversible capacity loss. The large irreversible capacity is ascribed to the slow lithium-ion diffusion rate in the layered structure, and the 'lost capacity' could be completely recovered by discharge to low voltage at relatively slow current density [16,17]. Figure 3(b) shows the cycling performance and coulombic efficiency of the NCA fibers at 0.5 and 1 C. After 100 cycles, the electrode delivered the reversible capacity of 147 and 120 mAh g −1 at 0.5 and 1 C, respectively.…”

“…Various unique NCA structures, such as concentration gradient [8], hierarchical hollow microsphere [9], flower-like structures [10], and microrod structures(i.e., nanofibers, nanowires, nanorods, and nanotubes), had received considerable attention due to their unique physical and electrochemical properties [11,12]. Hence, a unique ropelike NCA fiber was successfully synthesized in this study via electrospinning and heat-treatment.…”

Spray-Drying of Electrode Materials for Lithium- and Sodium-Ion Batteries

“…An advantage of spray-drying is that the ball-milled suspension can often be used directly as feedstock for spray-drying if the liquid medium is suitable (see [143,216,275,283] for a few examples). Another possibility is to use commercial nanopowders to prepare the suspension.…”

“…In a study of Chen et al on LiNi 0.8 Co 0.15 Al 0.05 O 2 [143], a suspension of a ball-milled precursor was dried either by spray-drying (SD-NCA sample) or by common drying (CD-NCA sample). The mixing by ball milling is the same in the two samples so that the much better electrode performance of the SD-NCA sample (e.g., a capacity retention of 75% after 500 cycles at 2 C, against only 12% for the CD-NCA sample) can be attributed to a more favorable microstructure induced by spray-drying.…”

“…Co. Shanghai, China)Yang et al [177]220-1.5 L/hAtomization pressure 0.5 MPa-Yue et al [182]---- H. Shaping of AMO 2 as spheres Chen et al [143]22090Compressed air pressure 0.2 MPa-…”