Atomically dispersed Ni induced by ultrahigh N-doped carbon enables stable sodium storage

Song, Keming; Liu, Jiefei; Dai, Hongliu; Zhao, Yong; Sun, Shuhui; Zhang, Jiyu; Qin, Changdong; Yan, Pengfei; Guo, Fengqi; Wang, Caiyun; Cao, Yong; Li, Shunfang; Chen, Weihua

doi:10.1016/j.chempr.2021.06.008

Cited by 81 publications

(54 citation statements)

References 52 publications

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“…The Coulombic efficiency (CE) values, defined as the ratio of the Na stripping capacity to the Na plating capacity, were applied to evaluate the reversibility of plated Na in the hosts. [ 29–31 ] As shown in Figure 4a and Figure S7 (Supporting Information), the Na║PRST‐CF and Na║homo‐CF samples showed considerably large variation of CE values with fluctuant voltage profiles, which should attribute to the repeated break‐down/build‐up of SEI and continuous Na consumption on the top surface of the homogenous hosts. The grad‐CF, however, depicted a stable CE value of 99.85% for at least 150 rounds with a smooth voltage profile ( Figure a; Figure S7c, Supporting Information), possibly because of the suppressed Na‐dendrite growth on its top surface during the charging/discharging process.…”

Section: Resultsmentioning

confidence: 99%

Regulating Sodium Deposition through Gradiently‐Graphitized Framework for Dendrite‐Free Na Metal Anode

Sun

Zhu

et al. 2022

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Na metal anode (NMA) is one of the most promising candidate materials for next‐generation low‐cost sodium metal batteries. However, the preferred deposition of Na metal at the anode/separator interface increases the risk of dendrite penetration of the separator, consequently, reduces safety and life of batteries with NMA. In this study, a Na deposition‐regulating strategy is shown by designing a gradiently graphitized 3D carbon fiber (CF) framework as host (grad‐CF), whereby Na is guided to deposit preferentially at the bottom of the anode, safely away from the separator. The obtained Na anode significantly reduces the probability of dendrite‐induced short circuits. The grad‐CF host enables NMA stable cycling at a high current density of 6 mA cm−2. When the Na@grad‐CF is applied as anode in full cells pared with Na3V2(PO4)3 (NVP) cathode, it exhibits a reversible capacity of 73 mA h g−1 after 500 cycles with a low decay rate of 0.13%.

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Section: Resultsmentioning

confidence: 99%

Regulating Sodium Deposition through Gradiently‐Graphitized Framework for Dendrite‐Free Na Metal Anode

Sun

Zhu

et al. 2022

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“…When the metastable phases are formed, the alloying reaction proceeds via complex combination of amorphization and recrystallization. 282 Since the study of the electrochemical performance of various alloy materials and alloying mechanisms has been exhaustively explained in the literature, 280,[283][284][285][286][287][288][289] we will focus our discussion on the most promising alloy materials in SIBs and PIBs. One of the advantages of alloy materials is delivering extremely high capacity due to their superior ability to accommodate multiple A atoms in the matrix structure compared to topotactic insertion materials 290 as shown in Fig.…”

Section: Reviewmentioning

confidence: 99%

Active material and interphase structures governing performance in sodium and potassium ion batteries

et al. 2022

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“…[51,52] It has also been reported that the SEI formation in the initial cycle could be suppressed by surface engineering. [53][54][55][56] For instance, FeNC/FeSC bonds on the carbon surface can enable a uniform 2D ultrathin SEI layer. [53] The CE obtained in the 2nd cycle was 99.4%, showing reversible sodium-ion intercalation without further SEI formation.…”

Section: Battery Performancementioning

confidence: 99%

A 3D‐Printed, Freestanding Carbon Lattice for Sodium Ion Batteries

Katsuyama

Kudo

Kobayashi

et al. 2022

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ephemeral forms of energy. In order to use the stored energy when needed and as fast as desired, batteries must exhibit high capacity and high power at an affordable cost. Researchers have made tremendous efforts to develop such technologies including silicon anodes for lithium-ion batteries (LIBs) with a gravimetric capacity an order of magnitude higher than graphite, [1][2][3] solid state electrolytes to improve the safety of batteries, [4] replacement of inorganic compounds by organic materials which requires less energy for mass production, [5][6][7][8][9] and substitution of lithium by other more abundant metals such as sodium, [10][11][12][13][14] potassium, [11] calcium, [15] magnesium, [16] aluminum, [17] and zinc. [17] Nevertheless, it still remains a challenging goal to simultaneously achieve high performance and low cost as they generally conflict with each other.One possible way to achieve this goal is to increase the mass loading of active materials in a single cell (Figure 1). [18][19][20][21][22][23][24][25] A single cell with 5 times thicker electrodes, instead of a stack of 5 cells, can reduce the amount of inactive components (separator, current collector, tabs, etc.) to one fifth, downsizing the overall cell size while saving as much as 26.1% of the cost per battery as shown in Table 1. [18] Based on the conventional film electrode fabrication process that uses a slurry containing the active materials as powders, increasing the amount of slurry per electrode is a simple concept. However, two problems arise: First, the kinetics of ion diffusion limits the maximum Increasing mass loadings of battery electrodes critically enhances the energy density of an overall battery by eliminating much of the inactive components, while compacting the battery size and lowering the costs of the ingredients. A hard carbon microlattice, digitally designed and fabricated by stereolithography 3D-printing and pyrolysis, offers enormous potential for high-mass-loading electrodes. In this work, sodium-ion batteries using hard carbon microlattices produced by an inexpensive 3D printer are demonstrated. Controlled periodic carbon microlattices are created with enhanced ion transport through microchannels. Carbon microlattices with a beam width of 32.8 µm reach a record-high areal capacity of 21.3 mAh cm −2 at a loading of 98 mg cm −2 without degrading performance, which is much higher than the conventional monolithic electrodes (≈5.2 mAh cm −2 at 92 mg cm −2 ). Furthermore, binder-free, pure-carbon elements of microlattices enable the tracking of structural changes in hard carbon that support the hypothesized intercalation of ions at plateau regions by temporal ex situ X-ray diffraction measurements. These results will advance the development of high-performance and low-cost anodes for sodium-ion batteries as well as help with understanding the mechanisms of ion intercalations in hard carbon, expanding the utilities of 3D-printed carbon architectures in both applications and fundamental studies.

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Atomically dispersed Ni induced by ultrahigh N-doped carbon enables stable sodium storage

Cited by 81 publications

References 52 publications

Regulating Sodium Deposition through Gradiently‐Graphitized Framework for Dendrite‐Free Na Metal Anode

Regulating Sodium Deposition through Gradiently‐Graphitized Framework for Dendrite‐Free Na Metal Anode

Active material and interphase structures governing performance in sodium and potassium ion batteries

A 3D‐Printed, Freestanding Carbon Lattice for Sodium Ion Batteries

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