23:T4c5,Graphite and lithium metal are two classic anode materials and their composite has shown promising performance for rechargeable batteries. However, it is generally accepted that Li metal wets graphite poorly, causing its spreading and infiltration difficult. Here we show that graphite can either appear superlithiophilic or lithiophobic, depending on the local redox potential. By comparing the wetting performance of highly ordered pyrolytic graphite, porous carbon paper (PCP), lithiated PCP and graphite powder, we demonstrate that the surface contaminants that pin the contact-line motion and cause contact-angle hysteresis have their own electrochemical-stability windows. The surface contaminants can be either removed or reinforced in a time-dependent manner, depending on whether the reducing agents (C₆→LiC₆) or the oxidizing agents (air, moisture) dominate in the ambient environment, leading to bifurcating dynamics of either superfast or superslow wetting. Our findings enable new fabrication technology for Li-graphite composite with a controllable Li-metal/graphite ratio and present great promise for the mass production of Li-based anodes for use in high-energy-density batteries.24:T544,Abstract Sodium metal batteries (SMBs) are promising for large scale energy storage due to the remarkable capacity of sodium metal anode (SMA) and the natural abundance of Na‐containing resources. However, multiple challenges exist with regards to the usage of SMBs, including dendritic Na growth, poor cyclability of SMA, and severe safety hazards stemming from the employment of the highly flammable liquid electrolytes. Herein, by introducing two functional fluorinated solvents, 1,1,2,2‐tetra‐fluoroethyl 2,2,3,3‐tetrafluoropropyl ether (HFE) and fluoroethylene carbonate (FEC) into trimethyl phosphate (TMP)‐based electrolyte, a SMA‐compatible flame‐retardant electrolyte is enabled, in which Na/Na symmetrical cells can cycle for 800 h at 1.0 mA cm −2 or 3.0 mAh cm −2 . Specifically, the non‐solvating HFE plays a critical role in increasing the local electrolyte concentration and reducing the unfavorable decomposition of TMP molecules. By introducing FEC as the co‐solvent simultaneously, its preferential defluorination induces a fluoride‐rich solid‐electrolyte interphase that prevents Na metal surface against the continuous parasitic reactions. More importantly, the designed electrolyte is endowed with an intrinsic non‐flammability, which manifests a prerequisite for the real‐life application of SMBs.25:T4ae,Sodium-ion batteries (SIBs) are more feasible for grid-scale applications than their lithium-ion counterparts when abundant sodium resources with an even geographic distribution are taken into consideration. However, developing an anode presents a major challenge since the standard graphite anode shows a limited Na-ion storage capacity. Here we report a CuCl₂/chitosan monolith derived CuP₂/C composite where CuP₂ nanoparticles are uniformly embedded in the carbon matrix. The strong chemical bonding between electron rich groups in chitosan and the heavy metal ion (Cu²⁺) plays a key role for the synthesis of the homogeneous monolithic composite, and chitosan derived carbon prevents Cu and CuP₂ particles from aggregation upon the following thermal reduction and phosphorization. Benefiting from the synergistic effect of small particle size and conductive carbon matrix, the CuP₂/C composite, as an anode for SIBs, delivers a high reversible capacity of 630 mAh/g at a current density of 100 mA/g and a capacity retention ratio of 91% after 200 cycles, while bare CuP₂ shows a rapid capacity decay within 50 cycles.26:T47c,Abstract Lithium metal anodes may allow the energy density limit of rechargeable lithium batteries to be pushed higher. However, simple and efficient processing technologies for thin Li metal are lacking, which has significantly limited its applications. Herein, the feasibility of engineering Li

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1	Engineering	5	5	273
2	Materials Science	4	4	251
3	Chemical Engineering	3	3	178
4	Chemistry	3	3	178
5	Electrical Engineering	2	2	163

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