首页|Enhanced electrochemical properties of potassium-doped lithium-rich oxide@carbon as cathode material for lithium-ion batteries
Enhanced electrochemical properties of potassium-doped lithium-rich oxide@carbon as cathode material for lithium-ion batteries
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NSTL
Elsevier
Lithium-rich layered oxides are believed to be the most competitive cathode materials for next -generation lithium-ion batteries (LIBs) due to their high specific capacity, but the poor cycle stability and voltage attenuation severely limit their commercial applications. In this paper, a simple method com-bining surface treatment via pyrolysis of polyvinyl alcohol (PVA) and potassium ions (K') doping, is designed to improve the above defects of the cobalt-free Lithium-rich material Li1.2Mn0.6Ni0.2O2 (LMR). The insoluble surface byproduct Li2CO3 and amorphous carbon nanolayer derived from the pyrolysis pro-cess of PVA alleviate the corrosion of acidic species with a favorable conductivity, while a large radius of K' can enlarge the space of the lithium (Li) layer to facilitate the diffusion of Li', suppress voltage polar-ization, and synchronously restrain the transformation from a layered structure to a spinel-like structure. After modification, the LMR material exhibits a great initial discharge capacity of 266.0 mAh g = 1 at 0.1C, a remarkable rate capability of 159.1 mAh g = 1 at 5C and an extremely high capacity retention of 98.5% over 200 cycles at 0.5C with a small voltage drop. (c) 2021 Elsevier Inc. All rights reserved.
Li1206Ni02O2Carbon nanolayerLiCo2Lattice spacingCycle and rate performanceLOW-COSTLICOMPOSITECAPACITYINTERCALATIONPERFORMANCEELECTRODESSTABILITYAL2O3
NSTL
Elsevier
