Soft carbon-coated bulk graphite for improved potassium ion storage  

作　　者：Xiaqing Chang Ning Sun Huanyu Zhou Razium ASoomro Bin Xu 

机构地区：[1]State Key Laboratory of Organic-Inorganic Composites,Beijing Key Laboratory of Electrochemical Process and Technology for Materials,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Chinese Chemical Letters》2023年第3期541-545,共5页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(NSFC,Nos.52072021,22005023);the Fundamental Research Funds for the Central Universities(No.buctrc202141)。

摘　　要：Potassium-ion batteries(PIBs) have attracted tremendous attention for large-scale energy storage fields based on abundant potassium resources. Graphite is a promising anode material for PIBs due to its low potassium ion intercalation voltage and mature industrialized preparation technology. However, the inability of graphitic structures to endure large volume change during charge/discharge cycles is a major limitation in their advancement for practical PIBs. Herein, a soft carbon-coated bulk graphite composite is synthesized using PTCDA as a carbon precursor. The PTCDA-derived soft carbon coating layer with large interlayer distance facilities fast potassium ion intercalation/extraction in the BG@C composite and buffers severe volume change during the charge/discharge cycles. When tested as anode for PIBs, the composite realizes enhanced rate capability(131.3 mAh/g at 2 C, 1 C=279 m A/g) and cycling performance(capacity retention of 76.1% after 150 cycles at 0.5 C). In general, the surface modification route to engineer graphite anode could inherently improve the electrochemical performance without any structural alteration.

关 键 词：GRAPHITE PTCDA Potassium-ion battery Anode materials Carbon coating 

分 类 号：TB332[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]