Sodium-ion batteries are especially attractive in the field of sustainable and cost-effective energy storage devices as promising alternatives to lithium-ion batteries. In this work, a lamellar carbon anode derived from biomass byproduct maize husks (LCMH) and a suitable NASICON structured Na3V2(PO4)3 cathode are utilized to assemble a full sodium-ion battery, which exhibits an extremely long cycle life of ∼1000 cycles and a high voltage of 4.1 V. More importantly, a stable reversible capacity of 239.6 mA h g(-1) for the LCMH anode is obtained, along with an ultra-long cycling performance of ∼5000 cycles and a high mass loading density of 8.31 mg cm(-2). Significantly, in-situ X-ray diffraction measurements are introduced to reveal the Na-storage mechanism and structure evolution upon battery cycling. This strategy provides a brand-new direction for building advanced electrode materials for full sodium-ion batteries.

Covalent organic framework (COF) as a kind of crystalline porous material possesses intriguing advantages, including low density, large surface area, permanent porosity, and excellent chemical stability. This novel material has shown great potential in the development of chromatographic stationary-phase materials. In this work, a room-temperature solvothermal method was utilized to yield a uniformly spherical COF-modified silica named Sil-COF. Then, the thiol-ene click chemistry was further used to modify thiolated β-cyclodextrin on the spherical Sil-COF composite for chiral separation called Sil-COF-CD. A series of characterization methods were performed to identify the successful construction of COF-modified stationary-phase materials. Then, three types of nonpolar substances realized baseline separation on the Sil-COF column. In addition, 2-phenylpropionic acid and 1-phenyl-1-propanol were selected as model enantiomers to identify the chiral recognition capability of the Sil-COF-CD column. Sil-COF and commercial β-CD columns were compared to further confirm the superiority of the prepared chiral column. In addition, both COF-modified columns possessed good repeatability. The results open a new avenue to apply spherical chiral COF for the preparation of the HPLC stationary phase.

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