Pectin, Hemicellulose, or Lignin? Impact of the Biowaste Source on the Performance of Hard Carbons for Sodium‐Ion Batteries

Hard carbons are currently the most widely used negative electrode materials in Na‐ion batteries. This is due to their promising electrochemical performance with capacities of 200–300 mAh g −1 and stable long‐term cycling. However, an abundant and cheap carbon source is necessary in order to comply with the low‐cost philosophy of Na‐ion technology. Many biological or waste materials have been used to synthesize hard carbons but the impact of the...