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Impact of Li2O/metal mole ratio on lithium-ion battery anode performance
Full text linkIn this study the electrochemical impact of Li2O/metal mole ratio on the cycle life of lithium-ion
battery anode materials is demonstrated. For this purpose, nanostructured layered LiNi1/3Mn1/3Co1/3O2
(LiNMC) and spinel LiMn1.5Ni0.5O4 (LiMNO) materials, traditionally known as cathode materials, are
evaluated as anode materials and compared against their lithium-free versions NMC (Ni:Mn:Co=1:1:1)
and MNO (Mn:Ni=3:1). The Li2O/metal ratio in fully lithiated states are 2.0 for lithium containing
(LiNMC and LiMNO) and 1.3 for lithium-free (NMC and MNO) samples. Battery tests show that
capacity fading of lithium containing samples is 3 to 4 times larger than lithium-free samples. The
differences in the electronic conductivities and voltages profiles of lithium containing and lithium-free
anode materials are suggested to be the origin of such electrochemical disparity
Hybrid MnO/Ni Li-ion Battery Anode Material with Enhanced Capacity Retention
Full text linkIntimately mixed MnO/Ni hybrid materials are synthesized using a two-step process; Pechini process
followed by a high temperature reduction step. As-prepared materials were characterized by X-ray
diffraction, transmission electron microscopy and electrochemical tests. (MnO)1-x/(Ni)x hybrid
materials with x=0, 0.2 and 0.5 mole ratios are electrochemically evaluated as anode materials for
lithium-ion batteries. The battery tests conclusively show that the coulombic efficiency, capacity
utilization factor, percentage capacity retention and high rate performance values of control MnO
material are enhanced with the presence of nearby metallic Ni nanoparticles. Oxide/metal hybrid
material could be a cheaper alternative to commonly known oxide/graphene system
Improved lithium-ion battery anode performance via multiple element approach
Full text linkIn this work, single (Co3O4), binary (Co3O4/ZnO) and ternary (Co3O4/ZnO/NiO) nanomaterials were successfully synthesized by Pechini method followed by a calcination step. Electrochemical lithium storage capabilities of the anode materials were studied. The results showed that the best capacity retention and lowest voltage hysteresis was achieved with ternary material. The ternary material showed a first cycle charge capacity of 649 mAh/g at 70 mA/g and maintained 83% of this capacity after 39 cycles. The results demonstrated the positive impact of multiple element strategy on the cycle life of anode materials.Q200041416620001
Dealloying technique in the synthesis of lithium-ion battery anode materials
No full textIn the last decade, dealloying has become a popular and effective strategy to fabricate nanoporous metals used in electrochemical applications such as electrocatalysis and energy storage. This review article summarizes the recent literature on dealloyed non-noble metals and oxides evaluated as lithium-ion battery anode materials. The importance of dealloying parameters to achieve desired pore and ligament sizes is emphasized. A future research roadmap is also provided.Q400038012060000