文献类型：期刊文献

英文题名：Weakly Aggregated Polymeric Network Enabling Advanced Hard Carbon for Sodium Storage

作者：Lin, Jianhao Liao, Zhishan Liu, Yike Zhao, Bote Wang, Jiexi Xiong, Xunhui

第一作者：Lin, Jianhao

通信作者：Xiong, XH[1]

机构：[1]South China Univ Technol, Sch Environm & Energy, Guangdong Prov Key Lab Adv Energy Storage Mater, Guangzhou, Peoples R China;[2]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang, Peoples R China;[3]Cent South Univ, Sch Met & Environm, Hunan Prov Key Lab Nonferrous Value Added Met, Engn Res Ctr,Minist Educ Adv Battery Mat, Changsha, Peoples R China

第一机构：South China Univ Technol, Sch Environm & Energy, Guangdong Prov Key Lab Adv Energy Storage Mater, Guangzhou, Peoples R China

通信机构：corresponding author), South China Univ Technol, Sch Environm & Energy, Guangdong Prov Key Lab Adv Energy Storage Mater, Guangzhou, Peoples R China.

年份：2026

外文期刊名：ADVANCED FUNCTIONAL MATERIALS

收录：;Scopus(收录号：2-s2.0-105039647448);WOS:【SCI-EXPANDED(收录号:WOS:001771681100001)】；

基金：The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Nos. 52322406 and 52264035), the Natural Science Foundation of Guangdong Province, China (No. 2024A1515010827) and the Double Thousand Plan in Jiangxi Province (No. jxsq2023101061).

语种：英文

外文关键词：aggregate chemistry; closed pores; free volume; hard carbon; sodium-ion batteries

摘要：Constructing a closed pore structure through precursor modification has been regarded as an effective route for boosting plateau capacity in hard carbon (HC) anodes for sodium-ion batteries (SIBs). However, the mechanistic role of polymer aggregation behavior in the closed pore formation in polymer-derived HCs remains poorly understood. Herein, flexible chain conformation has been incorporated into the phenolic resin network to weaken the aggregated state and promote closed pores formation in the polymer-derived HC for the first time. During the stepwise immersion in ethanol and water solvent, the extension of crystalline domains in polyethylene glycol segments can reduce the multichain aggregation as well as activate more free volumes within the polymer backbone. The weak aggregation transition can facilitate the multiple releases of volatile byproducts and mitigate the rearrangement of carbon skeleton, which constructs a plentiful closed pore structure with ultra-small pore size during pyrolysis. As a result, the as-obtained HC anode demonstrates a high reversible capacity (357.9 mAh g-1 at 0.1 C), enhanced rate performance (168.9 mAh g-1 at 5 C), as well as excellent cycling stability over 2000 cycles at 4 C. This work provides a valuable insight into aggregate chemistry toward the development of high-performance HC anodes for advanced SIBs.