Towards high-energy-density lithium-ion batteries: Strategies for developing high-capacity lithium-rich cathode materials

Restraining Oxygen Release and Suppressing Structure Distortion in Single‐Crystal Li‐Rich Layered Cathode Materials

“…To satisfy the high standards of next‐generation Li‐ion batteries, the development of high‐energy‐density cathode materials has been the top priority. [ 1 ] Li‐rich cathode materials generally can achieve the high output capacity of beyond 250 mAh g −1 by coupling with anionic redox activities, which greatly breaks through the capacity limitation of traditional cathode materials based on cationic redox reactions. [ 2 ] However, the Li‐rich oxides always suffer from the serious oxygen release, which induces the irreversible capacity and low columbic efficiency during the initial cycles, further hindering their practical applications.…”

Intelligent phase-transition MnO2 single-crystal shell enabling a high-capacity Li-rich layered cathode in Li-ion batteries

“…The in situ XRD (Bruker D8 Advance ECO, 10 min À1 , 15-72 ) was performed at 2.5-4.8 V and 0.1C. The in situ XRD cell used a halfcell in 2.3 (1). The in situ XRD device consisted of a Cu-made base and a cover with a sealed Be ring allowing penetration of the Xrays through and an electrode plate soaked in electrolyte.…”

“…The increased demand for electric vehicles (EVs) has necessitated improvements in high energy density in Li-ion batteries (LIBs). 1,2 The cathode material is the key variable for increasing the energy density of LIBs. 3,4 However, high-nickel ternary cathode materials have pronounced capacity fading, especially at high voltages, leading to a limited cycle life.…”

Enhancing cycle life of nickel-rich LiNi0.9Co0.05Mn0.05O2 via a highly fluorinated electrolyte additive - pentafluoropyridine

“…It has been well established that the electrolyte with appropriate additive could generate a unique and protective cathode electrolyte interphase (CEI) film on the surface of cathode particles during initial formation process, thus improving the cycling performance of the cell. [9,10,[17][18][19] Of note, research attention has been paid to N-containing heterocyclic molecules as functional electrolyte additives, due to its unique property and positive effect in CEI layer formation. For instance, Liao et al utilized a 1-(2-cyanoethyl) pyrrole (CEP) to construct a protecting CEI film on LiNi0.8Co0.1Mn0.1O2, significantly boosting its cycling performance.…”