Open AccessNitrogen‐doped porous biomass carbon with ultrastable performance as anodes for potassium‐ion batteries
Author(s) -
Zhang Yi,
Huang Zongwang,
Zhang Haimin,
Zhang Qiang,
Zhang Jun,
Pan Anqiang,
Cai Zhenyang,
Liu Sainan
Publication year - 2021
Publication title -
nano select
Language(s) - English
Resource type - Journals
ISSN - 2688-4011
DOI - 10.1002/nano.202000140
Subject(s) - anode , materials science , carbonization , carbon fibers , energy storage , porosity , lithium (medication) , chemical engineering , electrolyte , nitrogen , nanotechnology , electrochemistry , battery (electricity) , composite material , electrode , chemistry , scanning electron microscope , organic chemistry , medicine , power (physics) , physics , quantum mechanics , composite number , engineering , endocrinology
The potential safety hazards and limited lithium resources of lithium‐ion batteries (LIBs) have restricted their practical application. Potassium‐ion batteries (KIBs) are a novel energy storage technology with great cost advantages and are a promising alternative to LIBs. However, because of the large ionic radius of K + , the common anode materials used in LIBs exhibit a large volumetric expansion and structural collapse in the process of charging and discharging in a KIB. In this work, the prepared nitrogen‐doped porous carbon fibers (P‐CFs) from bombyx mori silk cocoons via a simple KCl activation and high‐temperature carbonization method. The P‐CFs possess a large specific surface area and one‐dimensional porous structure, offering facile storage and fast transport channels for K + ions. When used as an anode for KIBs, the P‐CFs exhibit a high reversible specific capacity of 275 mAh·g −1 at a current density of 0.1 A·g −1 after 500 cycles and even retain a capacity of 100 mAh·g −1 after 5000 cycles at 2 A·g −1 . This study demonstrates a simple strategy for the low‐cost synthesis of nitrogen‐doped porous carbon fibers from an environmental friendly biomaterial, with excellent electrochemical performance as an anode for KIBs.