Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ with Controllable Morphology and Size for High Performance Lithium-Ion Batteries

Abstract

The controllable morphology and size Li-rich Mn-based layered oxide LiNiCoMnO with micro/nano structure is successfully prepared through a simple coprecipitation route followed by subsequent annealing treatment process. By rationally regulating and controlling the volume ratio of ethylene glycol (EG) in hydroalcoholic solution, the morphology and size of the final products can be reasonably designed and tailored from rod-like to olive-like, and further evolved into shuttle-like with the assistance of surfactant. Further, the structures and electrochemical properties of the Li-rich layered oxide with various morphology and size are systematically investigated. The galvanostatic testing demonstrates that the electrochemical performances of lithium ion batteries (LIBs) are highly dependent on the morphology and size of LiNiCoMnO cathode materials. In particular, the olive-like morphology cathode material with suitable size exhibits much better electrochemical performances compared with the other two cathode materials in terms of initial reversible capacity (297.0 mAh g) and cycle performance (95.4% capacity retention after 100 cycles at 0.5 C), as well as rate capacity (142.8 mAh g at 10 C). The excellent electrochemical performances of the as-prepared materials could be related to the synergistic effect of well-regulated morphology and appropriate size as well as their micro/nano structure.

Engineering oxygen vacancies in hierarchically Li-rich layered oxide porous microspheres for high-rate lithium ion battery cathode

“…S3. The Brunauer-Emmett-Teller surface areas for LMNC and L@S are 6.2 and 7.2 m 2 g −1 , respectively, which are similar to the reported porous Li-rich cathodes [23]. Moreover, the pore distribution plots were analyzed via the Barret-Joyner-Halenda method.…”

Multi-stage constant-current charging protocol for a high-energy-density pouch cell based on a 622NCM/graphite system

“…The differential voltage (dQ/dV) curves can elucidate some of the locations and types of fade mechanisms in LICs. 24,25 The peaks on the dQ/dV curves originate from phase transitions, and the translation of the peak position represents the change in the cell internal resistance. 26 Fig.…”

“…4a and b, all the impedance spectra are composed of a single semicircle in the highfrequency region and an inclined line in the low-frequency region. [28][29][30] Generally, the semicircle is closely related to the charge transfer resistance (R ct ), which reects the electrode reaction kinetics, and the inclined line represents the Warburg impedance (Z w ), which is caused by the diffusion of lithium ions into the active material. 31 The intercept of the semicircle with the Z 0 -axis in the high-frequency region refers to unremunerative ohmic resistance (R s ), which includes the resistance of the electrolyte, Li metal anode and Al foil current collector.…”

A Layered Lithium‐Rich Li(Li0.2Ni0.15Mn0.55Co0.1)O2 Cathode Material: Surface Phase Modification and Enhanced Electrochemical Properties for Lithium‐Ion Batteries

“…Significantly, the spinel phase content for LNMC‐C is about 2.4 %, which is verified by the XRD Rietveld refinement. For both samples, the intensity ratio of I(003)/I(104) is larger than 1.2, which means a lower randomness of cations ,. To further examine the chemical composition of the synthesized materials, the ICP (inductively coupled plasma) analysis was performed.…”