Pre-doping iodine to restrain formation of low-active graphitic-N in hard carbon for significantly boosting sodium storage performance

Yin

Asia-Pacific J Chem Eng

et al. 2022

Tin anode has great potential for sodium-ion batteries owing to its high theoretical capacity, but its tremendous volume expansion during the sodium (de)alloying processes leads to the structural degradation and cycling instability. Herein, we report a new design strategy by using low-cost enzymatic hydrolysis lignin-derived hard carbon as an ideal support for Sn particles dispersion. Sn can be uniformly anchored on the robust carbon substrate, to efficiently relieve Sn volume expansion upon cycling. In addition, conductive hard carbon support can facilitate electrons to transfer and further enhance Na + storage capacity and accelerate facile Na + diffusion in the Sn/C hybrid anodes. The resultant Sn/C hybrids as anodes deliver high-rate performance as well as distinguished cycling stability in view of high reversible capacity of 374 mAh g À1 at 20 mA g À1 and capacity retention of 91% at 1000 mA g À1 after 1000 cycles, benefiting from high electrical conductivity, highly dispersed Sn particles and suitable pore structure. This work is expected to provide fresh insight into cost-effective Sn-based anodes for sodium ion batteries.

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

High‐performance Sn‐based anode with robust lignin‐derived hard carbon support for sodium‐ion batteries

Yin

Asia-Pacific J Chem Eng

et al. 2022

“…Hence, carbon‐based materials show a rapid capacity decay under high‐rate circumstances. In most previous studies, a sharp capacity decay can be generally observed when the current density exceeds 1 A g −1 12–17 . Besides, the narrow operating voltage window of carbon‐based materials hazards the potential for their practical applications 18 …”

Section: Introductionmentioning

confidence: 94%

“…It is instructive to compare the rate performance of the optimized Mn-NTO@C with a series of previously reported anode materials applied to SIBs, including O3-Na 2/3 Ni 1/3 Ti 2/3 O 2 , 27 NFPP/rGO, 28 Na 2 Ti 6 O 13 @C, 29 Ti 3 CNT x , 30 Ti 3 C 2 T x-HF, 31 NMMT, 32 NDIC 14 , PSC-NTP@C, 33 and I Pre -HC N 12 (Figure 5H). Not only does Mn-NTO@C show an improved capacity at relatively low current densities compared to other anode materials, but it also delivers a favorable rate performance with the current density exceeding 10 A g −1 .…”

Section: Electrochemical Performancementioning

confidence: 99%

“…In most previous studies, a sharp capacity decay can be generally observed when the current density exceeds 1 A g −1 . [12][13][14][15][16][17] Besides, the narrow operating voltage window of carbon-based materials hazards the potential for their practical applications. 18 Titanium-based anode materials, including TiO 2 and the corresponding salts such as sodium titanates (NTOs), have received broad attention because of their appropriate Ti 4+ /Ti 3+ redox potential (0.7 V vs. Na + /Na) and extended cycle capability.…”

Section: Introductionmentioning

confidence: 99%

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Sodium titanate nanowires for Na⁺‐based hybrid energy storage with high power density

Zuo

Liu

Jiang

et al. 2022

SusMat

It is crucial to enhance the rate capability of the titanium-based materials for fulfilling their promising potential as the anode materials of sodium-ion batteries (SIBs). Herein, Mn-doped sodium titanate (Mn-NTO) nanowires with homogeneously distributed ultrathin carbon nanosheets (Mn-NTO@C) are synthesized by a one-step salt-template-assisted method, showing much-enhanced power density. The as-prepared Mn-NTO@C demonstrates the realization of hybrid energy storage, which reconciles the diffusion-controlled behavior with the pseudocapacitive-controlled behavior. It has been revealed that the Mn heteroatoms can raise the proportion of Na 2 Ti 3 O 7 phase with the expanded crystal lattice, facilitating the diffusion-controlled insertion/extraction process of sodium ions. Meanwhile, the hybrid morphology of Mn-NTO nanowires and carbon nanosheets provides a promoted structure stability. As a result, the assembled Na||Mn-NTO@C half-cells work well at an extreme current density of 24 A g −1 for 10 000 cycles with a capacity retention of 95.2%. Moreover, the Mn-NTO@C||Na 3 V 2 (PO 4 ) 3 (NVP) full cells exhibit an attenuation of only 0.0015% per cycle at 20 A g −1 for over 10 000 cycles, and the energy density and power density of the full cells reach an ultrahigh level of 262 Wh kg −1 and 16.3 kW kg −1 , respectively.

Na₂O Inorganic Solid Electrolyte Interface Mediated Through Electrode Structure Engineering Enabling Outstanding Sodium‐Storage Performance for Transition‐Metal Selenide Anodes

Jiang,

Chen,

Liu

et al. 2024

Adv Funct Materials

Transition‐metal selenides hold great promise as advanced anode candidates for fast‐charging sodium‐ion batteries. However, an unstable solid electrolyte interphase (SEI) caused by their enormous volume expansion and strong catalytic action results in the continuous degradation of their sodium‐storage performance with cycling. Herein, a novel structure with carbon nanotubes bridging the adjacent layers of Mxene is constructed for host material, which can enrich the transport paths of electrons and ions within the electrode triggering a two‐electron reaction during the electrolyte decomposition, thereby tailoring an ultrathin and robust SEI rich in Na2O inorganic component. Thus the prepared anode demonstrates the improved initial Coulombic efficiency (87%) and cycling lifespan (442.9 mAh g−1 at 5 A g−1 after 1470 cycles). Meanwhile, it delivers a high‐rate capacity of 394.3 mAh g−1 at up to 20 A g−1, and accomplishes capacity retention above 90% as the current density transitions from 10 to 20 A g−1. Even when the current density increases to 5 A g−1 for 1470 cycles, the capacity retention is still higher than 90%. This study illustrates the feasibility of tailoring SEI components through electrode structure engineering and opens a new avenue to the controllable modulation of electrode‐electrolyte interfacial chemistry.