Robust Biomass-Derived Carbon Frameworks as High-Performance Anodes in Potassium-Ion Batteries.
Robust Biomass-Derived Carbon Frameworks as High-Performance Anodes in Potassium-Ion Batteries.
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DOI：
10.1002/smll.202206588
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发表时间：
2022-12
期刊：
影响因子：
13.3
通讯作者：
Jintao Chen;Guanxu Chen;Siyu Zhao;Junrun Feng;R. Wang;I. Parkin;Guanjie He
中科院分区：
文献类型：
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作者：
Jintao Chen;Guanxu Chen;Siyu Zhao;Junrun Feng;R. Wang;I. Parkin;Guanjie He
钾离子电池（PIB）具有低成本和高性能的优点，已成为电化学储能的最有前途的候选者之一。PIB的差的循环性能和倍率性能是由于电池运行期间电极材料的强烈结构变化。碳基材料作为阳极已经在锂离子电池和钠离子电池中成功商业化，但在钾离子电池领域仍在挣扎。这项工作进行结构工程策略，以诱导碳结构内的阴离子缺陷，以提高PIB阳极的动力学。碳框架提供了一个强大的和稳定的结构，以适应在循环过程中的材料的体积变化，和进一步的磷掺杂改性被证明，以提高倍率性能。发现这是由于孔径分布、电子结构以及因此电荷存储机制的改变。优化后的电极在0.2 A g-1的电流密度下具有175 mAh g-1的高容量，并且与PIB阳极相比，其倍率性能得到了提高（电流密度增加50倍，容量保持率为60%）。因此，本工作提供了一个合理的设计，以指导未来的研究，碳基阳极的PIB。
Potassium-ion batteries (PIBs) have become one of the promising candidates for electrochemical energy storage that can provide low-cost and high-performance advantages. The poor cyclability and rate capability of PIBs are due to the intensive structural change of electrode materials during battery operation. Carbon-based materials as anodes have been successfully commercialized in lithium- and sodium-ion batteries but is still struggling in potassium-ion battery field. This work conducts structural engineering strategy to induce anionic defects within the carbon structures to boost the kinetics of PIBs anodes. The carbon framework provides a strong and stable structure to accommodate the volume variation of materials during cycling, and the further phosphorus doping modification is shown to enhance the rate capability. This is found due to the change of the pore size distribution, electronic structures, and hence charge storage mechanism. The optimized electrode in this work shows a high capacity of 175 mAh g-1 at a current density of 0.2 A g-1 and the enhancement of rate performance as the PIB anode (60% capacity retention with the current density increase of 50 times). This work, therefore provides a rational design for guiding future research on carbon-based anodes for PIBs.