Chemical presodiation of alloy anodes with improved initial coulombic efficiencies for the advanced sodium-ion batteries

Li, Feifei; Yu, Xiang; Tang, Kai; Peng, Xinyi; Zhao, Qiangqiang; Li, Bang

doi:10.1007/s10800-022-01754-2

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…Owing to the nature of strong electronegativity, BP and NP can easily take electrons from sodium to form Na-arene complex, thus they are widely used as solutes in chemically presodiated solutions. [20,22,25,26] However, the lower reduction potential of BP compared with NP results in a more violent presodiation, making it more difficult to control the degree of presodiation. [20,25,29] Therefore, we chose NP as a milder solute for the preparation of presodiation solution.…”

Section: Screening Of Solventsmentioning

confidence: 99%

“…Subsequently, Qian et al [22] increased the ICE of HC to 100% within 60 s by employing sodium biphenyl/dimethoxyethane (Na-BP/DME) presodiation agent. Furthermore, the analogous approaches had been applied to the presodiation of reduced graphene oxide, [25] antimony, [21] tin, [26] and phosphorus anodes, [19,26] which has achieved significant effects in the improvement of ICE and energy density. Nevertheless, when a Na-deficient (e.g., P-2 type) cathode is coupled with HC anode, a large excess amount of active Na required.…”

Section: Introductionmentioning

confidence: 99%

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Full‐Cell Presodiation Strategy to Enable High‐Performance Na‐Ion Batteries

Wang,

Chen,

Qiu

et al. 2023

Advanced Energy Materials

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As promising alternatives to lithium‐ion batteries, sodium‐ion batteries suffer from low coulombic efficiency, which stems from Na‐deficiency and unstable interfaces for both cathode and anode materials. Exhibiting a favorable solvation structure, Na‐naphthalene/tetrahydropyran (Na‐NP/THP) is screened and selected as a full‐cell presodiation solution for hard carbon (HC) anodes and a P‐2 type Na0.67Fe0.1Al0.1Mn0.8O2 (NFAM) cathode, which are both Na‐deficient. Through a wealth of characterizations, it is revealed that the proposed presodiation agent not only boosts the initial coulombic efficiency of both HC and NFAM electrodes effectively, but also facilitates robust solid–electrolyte interphase (SEI) and cathode–electrolyte interphase (CEI) on both electrodes. Consequently, the long‐term cycling and rate performance are greatly improved thanks to the stabilized structures of electrode materials. Furthermore, a proof‐of‐concept NFAM||HC pouch cell based on this presodiation strategy is assembled, showing a high reversible capacity and superior cycling performance. By offering a remedy to a full cell system subjected to severe Na‐deficiency, this work conceptually demonstrates a feasible strategy to fully tap the potential of high‐energy‐density materials in sodium‐ion batteries.

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