Abstract
Based on rich resources of potassium (K), its application in energy storage is becoming more and more attention. Due to the larger size of K+, the large strain and consequent irreversibility during K+ insertion/extraction may result in the inferior cycling life of an electrode. Generally, the common carbon cannot obtain high specific capacity and long-cycling stability, so we try to design and prepare porous red blood cell-like carbon (PRBCC) by spray drying, heat nitric acid treatment and subsequent heat treatment. As anodes for potassium ion batteries (KIBs), It is found that the PRBCC electrode can deliver an initial discharge capacity of 1213 mA h g−1 at 0.1 A g−1. Increased to 1 A g−1, the PRBCC electrode can still maintain 147 mA h g−1 at the 1000th cycle. Furthermore, we hope that this work can provide a basis on the future research of carbon nanomaterials for KIBs.
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