Template GNL-assisted synthesis of porous Li_1.2Mn_0.534Ni_0.133Co_0.133O₂: towards high performance cathodes for lithium ion batteries

Abstract

A high performance cathode of porous Li1.2Mn0.534Ni0.133Co0.133O2 for lithium ion batteries synthesized by a GNL-template.

Advanced Li-Rich Cathode Collaborated with Graphite/Silicon Anode for High Performance Li-Ion Batteries in Half and Full Cells

“…It is noteworthy that a reversible capacity of 267.3 mA h g −1 is recovered when the current rate reduced back to the initial rate of 0.1 C after 70 cycles at higher C rates, indicative of an excellent reversibility of the capacity and its suitability as a high rate cathode material for the GNL-modified LMNCO. Herein, the rate performance of the GNL-modified LMNCO is superior to that of the porous GNL-LMNCO and ordinary LMNCO in our previous publication (Ref 23),. which can be attributed to the excellent electronic conductivity of the graphene and CNTs adhered on the porous LMNCO particles and the very special architecture of the close cross-linking of the CNTs with the porous LMNCO particles.…”

“…5c, and the data of the porous GNL-LMNCO and ordinary LMNCO in our previous publication (Ref. 23) are both presented at the same time in Fig. 5c for comparison.…”

“…Typically, two evident oxidation peaks at 4.07 V and 4.60 V in the initial cycle can be obviously discerned, while only one obvious oxidation peak at about 4.0 V is discovered in the next two circles. As for the first cycle, the anodic peak located at 4.08 V can be ascribed to the reversible extraction of Li + ions from the LiMn 1/3 Ni 1/3 Co 1/3 O 2 region accompanied by the oxidation of Ni 2+ to Ni 4+ and Co 3+ to Co 4+ [43,44], while the other sharp peak at about 4.60 V, which gradually disappears in the next two cycles, is related to the activation reaction of Li 2 MnO 3 along with the removal of Li 2 O from the Li 2 MnO 3 regions [7,23]. What's more, the second peak at about 4.60 V is well acknowledged as the irreversible oxidation peak associated with the irreversible capacity lost of the electrode in the first charge process, which is accordant with the voltage plateaus analysis in the initial charge-discharge curves in Fig.…”

“…5a, and the profiles of the porous GNL-LMNCO and ordinary LMNCO of our previous publication (Ref. 23) are simultaneously shown in [39]. Most importantly, the synergistic effect between the porous LMNCO and GNL-modified layer can further improve its conductivity, which enables the fast migration of both lithium ions and electrons to reach the interior of each active particle and thus promotes the surface Li storage capacities, making full utilization of the materials and resulting in excellent electrochemical performance [40].…”

“…Graphene oxide[15] is adopted as nanocoating materials on the Li 1.2 Ni 0.13 Mn 0.54 Co 0.13 O 2 , which reveals a very high discharge capacity of 313 mAh g -1 at 12.5 mA g -1 .Li-rich layered cathode material of Li 1.2 Mn 0.534 Ni 0.133 Co 0.133 O 2 is explored in this paper. And in our previous study[23], porous Li 1.2 Mn 0.534 Ni 0.133 Co 0.133 O 2 (porous GNL-LMNCO) was synthesized by a template GNL-assisted co-precipitation method. GNL (graphene-based carbon nanotubes conductive liquid, 5.7% solid content, BTR Nano Tech Co.,Ltd.)…”