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The potassium‐ion battery (PIB) has emerged as a promising alternative to lithium‐ion batteries. The major challenges confronted by PIB anodes lie in sluggish kinetics and poor cycling stability owing to the inherent large K+ size. Here, a hybrid of ball‐cactus‐like Bi nanospheres embedded in 3D N‐riched carbon nanonetworks (Bi NSs/NCNs) is designed and synthesized by electrospinning. As an anode,...
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