A solvothermal pre-oxidation strategy converting pitch from soft carbon to hard carbon for enhanced sodium storage  

作　　者：Jing Wang Lei Yan Binhua Liu Qingjuan Ren Linlin Fan Zhiqiang Shi Qingyin Zhang 

机构地区：[1]Tianjin Key Laboratory of Advanced Fibers and Energy Storage,School of Materials Science and Engineering,Tiangong University,Tianjin 300387,China [2]School of Chemical Engineering and Technology,Tiangong University,Tianjin 300387,China

出　　处：《Chinese Chemical Letters》2023年第4期580-583,共4页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 22179094)。

摘　　要：Due to its low cost and easy availability, the pitch is considered a promising precursor for soft carbon anodes. However, pitch-derived soft carbon shows a high graphitization degree and small interlayer spacing, resulting in its much lower sodium storage performance than hard carbon. We propose a novel preoxidation strategy to introduce additional oxygen atoms into the low-cost soft carbon precursor pitch to fabricate a defect-rich and large-interlayer spacing hard carbon anode(HPP-1100). Compared with the direct pyrolysis of pitch carbon, the sodium storage capacity of HPP-1100 is significantly improved from 120.3 m Ah/g to 306.7 m Ah/g, with an excellent rate and cycling capability(116.5 m Ah/g at 10 C). Moreover, when assorted with an O_(3)-Na(NiFeMn)1/3O_(2)cathode, the full cell delivers a high reversible capacity of 274.0 m Ah/g at 0.1 C with superb cycle life. This work provides a new solution for realizing the application of low-cost pitch anodes in Na-ion batteries.

关 键 词：Soft carbon Hard carbon Solvothermal pre-oxidation Na-ion battery PITCH 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ127.11[化学工程—无机化工]