2023
DOI: 10.1002/adfm.202308392
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Rationally Designing Closed Pore Structure by Carbon Dots to Evoke Sodium Storage Sites of Hard Carbon in Low‐Potential Region

Yujie Huang,
Xue Zhong,
Xinyu Hu
et al.

Abstract: Hard carbon (HC) is widely regarded as the most promising anode material for sodium‐ion batteries (SIBs). For improving the sodium storage capacity of HC anode, current research primarily focuses on the high‐voltage slope region. Actually, increasing the storage capability in the low‐voltage plateau region is more important for enhancing the energy density of full cells. Therefore, in this study, HC anode with rich closed pore structure is designed and constructed with the help of carbon dots (CDs), and it is … Show more

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Cited by 29 publications
(6 citation statements)
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“…Moreover, the reversible specific capacity/plateau capacity of GHC x is significantly lower than that of ZGHC1500. Figure g and Table S4 provide a comparison on the reversible specific capacity/plateau capacity of ZGHC1500 anode with the recently reported hard carbon anodes for SIBs, ,,,,,, demonstrating its leading position.…”
Section: Resultsmentioning
confidence: 70%
“…Moreover, the reversible specific capacity/plateau capacity of GHC x is significantly lower than that of ZGHC1500. Figure g and Table S4 provide a comparison on the reversible specific capacity/plateau capacity of ZGHC1500 anode with the recently reported hard carbon anodes for SIBs, ,,,,,, demonstrating its leading position.…”
Section: Resultsmentioning
confidence: 70%
“…In addition, modifying the pore structure (e.g., porosity and pore size) is a potent strategy to promote sodiation kinetics since it can (1) tune the specific surface area (SSA), (2) elevate the intrinsic defect concentration that favors the adsorption behavior of Na + , and (3) serve as channels to facilitate Na + transfer . Furthermore, the plateau capacity of hard carbons can be effectively increased by a rational design of pore structure, such as closed-pore structure. For instance, ultramicropores prepared by the molten diffusion-carbonization method can offer extra Na + storage sites and serve as ionic sieves that accelerating fast diffusion of Na + during the sodiation/desodiation process . Besides, to maximize radical sites for Na + storage, a multistage pore structure (macropores and ultramicropores) was built and achieved excellent rate capability .…”
Section: Introductionmentioning
confidence: 99%
“…13 Actually, the main source of influence on the SIB capacity is the plateau capacity, and focusing solely on the sloping capacity tends to engender a reduction in the half-cell operating voltage. 14 The ability to store sodium within the plateau domain is fundamentally linked to the presence and characteristics of intricate nanoscopic pores, especially closed pores. 15 Under these circumstances, Yang et al employed ethanol as porogen to enhance the sodium-ion storage architecture within carbonaceous materials.…”
Section: Introductionmentioning
confidence: 99%
“…The leftward displacement of the G peak signifies that alterations in the microstructure of the closed pores do not notably impinge upon the intercalation of Na + within the graphite planes. 14 It also suggests that the sodium-ion filling of the pore and the insertion reaction existed at the same time. The "adsorption−intercalation−pore filling" mechanism in HC (Figure 5f) is demonstrated above, and it is noteworthy that the strategic inclusion of copious amounts of closed pores can indeed boost the participation of the filling mechanism without impairing the sodium-ion embedment within the carbon matrix, thereby elevating the proportion of plateau capacity.…”
mentioning
confidence: 99%