MXene interlayer anchored Fe3O4 nanocrystals for ultrafast Li-ion batteries

Chen

et al. 2022

Small

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et al. [13] found that the platform capacity of ball-milled carbon materials dropped sharply, which is consistent with graphite structural collapse in LIBs. Sun et al. [14,15] also proved the existence of an insertion reaction through in situ XRD experiments. Although a lot of studies have proven this model, some experimental phenomena still cannot be explained. Recently, Atsuo Yamada et al. [16] have explored in detail the sodium storage process of hard carbon by combining ex situ small and wide-angle X-ray scattering (SAXS/WAXS) techniques. The results show that the platform capacity is attributed to both insertion and nanopore filling mechanisms. Azusa Kamiyama et al. [17] synthesized a hard carbon material with abundant nanopores through the MgO template technology and an ultrahigh reversible capacity of 478 mAh g −1 was obtained. All these results indicate the principle of adsorption-embedded nanopore filling of hard carbon.Although many experiments and discussions have been conducted on the mechanism of hard carbon materials, the rate performance is still unsatisfactory. However, the previous results show that the co-intercalation of Na + and ether solvents have excellent rate performance with a graphite anode. Both Jache et al. [18] and Kim et al. [19] found that the capacity of the Na[solv] + (solvent solvated Na + ) embedded between graphite layers almost has no decay at different current densities. Sung Chul Jung et al. [20] used the DFT theoretical calculation method to reveal that the ternary Na-diglyme-GIC has a strong interlayer coupling strength. In addition, since Na + has a weaker interaction with diglyme, the diffusion rate of Na + -diglyme complex is 5 orders of magnitude faster than that of Li + -diglyme complex. Mustafa Goktas et al. [21] revealed that the introduction of the co-intercalation process makes this system an example of none SEI, which leads to rapid ion diffusion behavior.In this work, hard carbon fibers with self-supporting properties were prepared to eliminate the influences of binders and conductive agents. A solvent co-intercalation mechanism was introduced into the hard carbon sodium storage mechanism for the first time. In situ XRD and ex situ TEM XPS characterizations were performed to prove it. Introducing the co-intercalation of solvents enabled the hard carbon materials to exhibit 245 mAh g −1 at a current density of up to 5 A g −1 , which can maintain 72% of the one at 50 mA g −1 . The full battery assembled with Na 3 V 2 (PO 4 ) 3 had a high energy density of 157 Wh kg −1 at 3800 W kg −1 (relative to the electrode). It is worth noting that plateau capacity has hardly any decay at high current densities.As the most successful anode material for sodium-ion batteries, hard carbon has attracted extensive attention from researchers. However, its storage mechanism is still controversial. In this paper, a solvent co-intercalation mechanism into hard carbon is proposed and is proved by in situ XRD and ex situ TEM XPS results successfully. Thanks to the co-intercalation of sol...

Section: Resultsmentioning

confidence: 99%

“…Figure 5. a) In situ XRD data of HCF-1000; b) In situ XRD data of HCF-1500; c) Rate performance graph of the full battery; d) Power density of NVP/ HCF compared with other works[23][24][25][26][27][28][29][30][31][32][33][34][35][36] ; e) Cycle performance graph of the full battery.…”

mentioning

confidence: 99%

Introducing the Solvent Co‐Intercalation Mechanism for Hard Carbon with Ultrafast Sodium Storage

Chen

et al. 2022

Small

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“…Therefore, the development of power storage component with excellent specific power and energy density is imminent. 6,7 As a result, researchers begin to exploit new electrode with excellent specific capacity and high-speed transmission of lithium ions. 8 Transition metal oxides (TMO) is widely used in Li-ion storage because of its higher theoretical lithium storage capacity.…”

Section: Introductionmentioning

confidence: 99%

MnO₂/MXene–Ti₃C₂T_x flexible foam for use in lithium ion storage

et al. 2021

“…The range between 0.5 and 1 implies that the reversible capacity is controlled by two processes. 37 The slopes of the oxidation peak and the reduction peak are 0.897 and 0.876, respectively, indicating that there are two contributions to the overall electrochemical process. With the different scan rates, the ratio from the Faraday pseudocapacitance contribution gradually increased.…”

Section: Electrochemical Properties Of Lithium-ion Batteriesmentioning

confidence: 99%

Carbon-coated Fe₃O₄ nanoparticles in situ grown on 3D cross-linked carbon nanosheets as anodic materials for high capacity lithium and sodium-ion batteries

Xie

et al. 2022

New J. Chem.