Co3O4 nanospheres composed of highly interconnected nanoparticles for boosting Li-Ion storage

et al. 2022

ACS Appl. Nano Mater.

The cheap biomass-derived carbon-encapsulated strategy has recently attracted much attention in enhancing the properties of metal oxide-based anodes for lithium-ion batteries (LIBs). Herein, graphitic carbon (GC)-encapsulated Co 3 O 4 material with mesoporous hierarchical structure was prepared by immersion, carbonization, and air calcination with poplar branch as a biotemplate and carbon source. We also investigated the impact of different carbon contents on the nanostructure and electrochemical performance of composites. The microtube wall of Co 3 O 4 /GC 350 oxidized at 350 °C is assembled by cross-linking Co 3 O 4 nanoparticles and graphitic carbon, making Co 3 O 4 /GC 350 possess a large specific surface area of 70.4 m 2 g −1 and a concentrated mesopore size distribution of 3.75 nm. As an anode for LIBs, Co 3 O 4 /GC 350 exhibits better lithium storage performance than the product oxidized at 450 °C. At 1 A g −1 , it delivers a stable capacity of 665.7 mA h g −1 after long cycling 1200 times and even retains a capacity of 294.1 mA h g −1 at 5 A g −1 , indicating that Co 3 O 4 /GC 350 nanomaterial has good rate performance and longcycling stability. The excellent electrochemical performance is primarily ascribed to the unique mesoporous nanostructure, large specific surface area, encapsulated GC in Co 3 O 4 /GC 350 , and the synergism of pseudocapacitive behavior arising from oxygen vacancy defects and the mesoporous structure. Therefore, the simple, eco-friendly, and large-scale poplar branch-templated strategy in this work can offer a beneficial experience for synthesizing other transition-metal oxide anodes.

Section: Resultssupporting

confidence: 58%

Section: Resultsmentioning

confidence: 98%

Mesoporous Tubes Composed of Graphitic Carbon-Doped Co₃O₄ Nanoparticles for Lithium Storage

Wang

Teng

et al. 2022

ACS Appl. Nano Mater.

“…Due to the capacity of biomass-derived graphitic carbon being about 130 mA h g –1 at 1 A g –1 (Figure S2), the introduction of biomass-derived graphitic carbon can contribute to the capacity of Co 3 O 4 -based nanocomposites in LIBs . During the first cathodic scan, both Co 3 O 4 /C-1 and Co 3 O 4 /C-2 electrodes show a strong cathodic peak at 0.70 and 0.67 V, ascribed to the reduction of Co 3+ ions to Co 0 , decomposition of electrolyte, and formation of amorphous Li 2 O and SEI films. , At the first anodic scan, the CV curves of Co 3 O 4 /C-1 and Co 3 O 4 /C-2 electrodes display a wide oxidation peak at 2.06 and 2.10 V, which are assigned to the oxidation of Co 0 to Co 3+ ions and the formation of Co 3 O 4 , as well as the decomposition of Li 2 O . Therefore, they have the same redox reaction mechanism: Co 3 O 4 + 8Li + + 8e – ↔ 4Li 2 O + 3Co.…”

Section: Resultsmentioning

confidence: 99%

“…13,48 At the first anodic scan, the CV curves of Co 3 O 4 /C-1 and Co 3 O 4 /C-2 electrodes display a wide oxidation peak at 2.06 and 2.10 V, which are assigned to the oxidation of Co 0 to Co 3+ ions and the formation of Co 3 O 4 , as well as the decomposition of Li 2 O 34. Therefore, they have the same redox reaction mechanism: Co 3 O 4 + 8Li + + 8e − ↔ 4Li 2 O + 3Co.…”

mentioning

confidence: 99%

Biomass-Derived Graphitic Carbon/Co₃O₄ Nanocomposites with Pseudocapacitance for Lithium Storage

Deng

et al. 2021

ACS Appl. Nano Mater.

The reuse of waste biomass resources has recently become one of the most popular themes in the sustainable development of human society. To this end, waste scallion root was used as a biotemplate and carbon source to synthesize graphitic carbon-doped mesoporous Co3O4 nanocomposites (Co3O4/C) through a simple cobalt salt impregnation, carbonization, and low-temperature oxidation method. The effect of different carbon contents on the nanostructure and electrochemical performance is investigated. The hierarchical microtubes with a ribs-shaped inner wall in the product oxidized at 320 °C (Co3O4/C-2) are formed by the cross-linking of uniform small Co3O4 nanoparticles and 39.9% biomass-derived carbon. The Co3O4/C-2 nanocomposite has a large specific surface area of 360.2 m2·g–1, uniform mesopore size of 2.35 nm, and abundant oxygen vacancy defects. Such a unique nanostructure can exhibit a good pseudocapacitance behavior during the charge/discharge process, thereby effectively enhancing the lithium storage performance. The Co3O4/C-2 nanocomposite exhibits a high capacity and good rate capability. Even at 1.0 A g–1, it can still retain a capacity of 620 mA h g–1 after 1500 cycles. The superior capacity retention and long-cycling stability can be assigned to the synergistic effect of the unique nanostructure of the Co3O4/C-2 material (a uniform mesopore and large specific surface area), appropriate graphitic carbon doping, and pseudocapacitance contribution. Therefore, the reuse strategy of the waste scallion root biomass resource conforms to the concept of sustainable development and also provides a useful reference for the synthesis of other nanostructured anode materials with excellent performance.

Acta Metall. Sin. (Engl. Lett.)

“…Aimed at handling the above-mentioned problems, the construction of protective layer with carbonaceous component is accounted as an appealing approach, which can improve the electrochemical properties of anode materials [12][13][14]. Nevertheless, the presence of carbonaceous materials can not only suppress the capacity of Co 3 O 4 but also make the preparation process complex [15]. Hence, it is highly desirable to design Co 3 O 4 with suitable architectures to obtain high capacity and long-term cycling performance.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Preparation of Homogeneous Cobalt Oxide Nanomaterials as Stable Anodes for Superior Lithium Ion Batteries

Wang

2021

In this study, uniform Co 3 O 4 nanoparticles are prepared via a simple and facile hydrothermal synthesis without calcination treatment. When the Co 3 O 4 nanomaterials are investigated as anodes for lithium ion batteries, a good electrochemical property is achieved. Particularly, the reversible capacity of the as-synthesized Co 3 O 4 nanoparticle has a significant growth from 383 mAh g −1 of the initial cycle to 471 mAh g −1 of the 300th cycle at 2 A g −1 . Moreover, when it recovers to 50 mA g −1 after different current densities, a superior reversible capacity of 695 mAh g −1 can be reached. Such favorable electrochemical properties will make the as-obtained Co 3 O 4 have a good application prospect as anode material for lithium ion batteries.