The effects of LiTi₂(PO₄)₃modification on the performance of spherical Li_1.5Ni_0.25Mn_0.75O_2+δcathode material

Abstract

Effect of LiTi2(PO4)3 coating on the electrochemical properties of spherical layered Li1.5Ni0.25Mn0.75O2+δ cathode material.

Li1.2Ni0.13Co0.13Mn0.54O2 with Controllable Morphology and Size for High Performance Lithium-Ion Batteries

“…Figure e presents the CV of the LNCM-O sample at a scan rate of 0.1 mV s –1 in a voltage range of 2–4.6 V. It can be apparently found that the peaks of CV curves are completely consistent with charge/discharge profiles. The anodic peak at ∼4.0 V is assigned primarily to the oxidation of Ni 2+ /Co 3+ to Ni 4+ /Co 4+ , meanwhile, the strong anodic peak around 4.6 V is principally associated with the extraction of Li + from Li 2 MnO 3 component accompanying with the extraction of oxygen and structural rearrangement. − Besides, the followed curves were overlapped well with each other, confirming that LNCM-O sample exhibits an eminent structural reversibility and good cycle performance.…”

Computational Screening of Cathode Coatings for Solid-State Batteries

“…Notably, after this round of screening, the polyanionic oxides (109) outnumber the non-polyanionic oxides (31) because of their higher pass rates (26.5% for polyanionic oxides versus 7.8% for non-polyanionic oxides). It is worth noting that several polyanionic oxide coatings that have been used in cells with liquid electrolyte have oxidation limits exceeding our threshold (e.g., LiCoPO 4 (4.19 eV), 57,58 LiNiPO 4 (4.22 eV), and 59 LiTi 2 (PO 4 ) 3 (4.59 eV) 60 ), explaining their reported good performance. The pass rate is 12.9% for oxyfluorides, which is in between the numbers for polyanionic oxides and non-polyanionic oxides.…”

“…Indeed, when charged to 4.6 V, LiTi 2 (PO 4 ) 3 coating enhanced the capacity retention and rate capacity of a Li 1.5 Ni 0.25 Mn 0.75 O 2+d cathode in a conventional Li-ion battery. 60 Challenges with the Current Coating Strategy Beyond the screening requirements used in this work, there are many other challenges associated with designing an optimal cathode composite. For example, the formation of electronically conductive interphase products at the coating/electrolyte interface would make the coating a mixed conductor and compromise its functionality.…”

Mitigating voltage and capacity fading of lithium-rich layered cathodes by lanthanum doping

“…It can provide much higher reversible capacity (250-300 mAh g -1 ) and operating voltage (>4.6 V vs. Li + /Li) than the traditional cathode materials such as LiCoO2, spinel LiMn2O4 and olivine LiFePO4, because of its particular crystal structure. In the recent years, the studies on the relationship between structure and electrochemical performance of LLO material have been widely reported [17][18][19][20][21][22][23][24][25]. However, the studies for the structure of LLO materials and effect of the structure on their electrochemical performance still remain controversial.…”