Ultra‐High Capacity Lithium‐Ion Batteries with Hierarchical CoO Nanowire Clusters as Binder Free Electrodes

Abstract

Although transition metal oxide electrodes have large lithium storage capacity, they often suffer from low rate capability, poor cycling stability, and unclear additional capacity. In this paper, CoO nanowire clusters (NWCs) composed of ultra-small nanoparticles (≈10 nm) directly grown on copper current collector are fabricated and evaluated as an anode of binder-free lithium-ion batteries, which exhibits an ultra-high capacity and good rate capability. At a rate of 1 C (716 mA g −1 ), a reversible capacity as high as 1516.2 mA h g −1 is obtained, and even when the current density is increased to 5 C, a capacity of 1330.5 mA h g −1 could still be maintained. Importantly, the origins of the additional capacity are investigated in detail, with the results suggesting that pseudocapacitive charge and the higher-oxidation-state products are jointly responsible for the large additional capacity. In addition, nanoreactors for the CoO nanowires are fabricated by coating the CoO nanowires with amorphous silica shells. This hierarchical core-shell CoO@SiO 2 NWC electrode achieves an improved cycling stability without degrading the high capacity and good rate capability compared to the uncoated CoO NWCs electrode.

Nanogravel structured NiO/Ni foam as electrode for high-performance lithium-ion batteries

“…Subsequently, it is observed that the reversible discharge capacity gradually increased to 1026.20 mA h g −1 at 40th cycles with a coulombic efficiency of 100.25 %, which reveals excellent cyclability of electrode compared with those reported as 680 mA h g −1 after 50 cycles at 2 C rate [52], 865 mA h g −1 after 50 cycles at 1 C rate [53], and some others as reported in [54][55][56]. In addition, the as-prepared nanogravel structured NiO/Ni electrode exhibited better performances than other reported transition metal oxides electrodes, such as CuO [57], Cu 2 O [58], CoO [59,60], Co 3 O 4 [61], and Fe 2 O 3 [62,63]. It is found that the cycling performance of the nanogravel structured NiO/Ni electrode (capacity retention after 20 cycles to the initial cycle) is comparable to that of CuO electrode (−40 %) [57], Cu 2 O electrode (−52 %) [58], and Fe 2 O 3 electrode (−63 %) [62].…”

Microstructural design of hybrid CoO@NiO and graphene nano-architectures for flexible high performance supercapacitors

“…49 An intelligent strategy to enhance electrochemical performance of transition metal oxides is to tune their microstructure to achieve large specific surface area. annealing process can be expressed with the following equations: 50,51 (1)…”

Cobalt Oxide Porous Nanofibers Directly Grown on Conductive Substrate as a Binder/Additive-Free Lithium-Ion Battery Anode with High Capacity

“…Among various transition metal oxides, cobalt monoxide (CoO) has drawn great attention due to its high theoretical capacity of 716 mA h g −1 which is nearly twice than that of graphite anode [2, 6]. Nevertheless, this anode material suffers from large volumetric change during discharging/charging cycles, leading to pulverization and capacity fading of bulk electrode.…”