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Bismuth (Bi) has attracted attention as a promising anode for sodium‐ion batteries (SIBs) owing to its suitable potential and high theoretical capacity. However, the large volumetric changes during cycling leads to severe degradation of electrochemical performance and limits its practical application. Herein, Bi nanoflowers are encapsulated in N‐doped carbon frameworks to construct a novel Bi@NC composite...
This paper studied the cutting experiments of dry turning the cemented and hardened steel 20CrMnTi using cemented carbide cutting tools, ceramic cutting tools and PCBN cutting tools. Through measuring the value of surface roughness in varying cutting conditions, analyzed the influence of cutting speed and the feed rate to the surface roughness, obtained two empirical formulas Ra-v and Ra-f. This research...
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