Biomaterial-derived porous carbon doped with heteroatoms as a separator coating for high-energy-density Zn-I batteries  

作　　者：Shanshuai Chen Liu Tian Xiaoqiang Feng Huanyu Bao Hongliang Wang 

机构地区：[1]School of Breeding and Multiplication,Sanya Institute of Breeding and Multiplication,Hainan University,Sanya 572025,China. [2]College of Tropical Agriculture and Forestry,Hainan University,Danzhou 571737,China. [3]College of Agronomy and Biotechnology,China Agricultural University,Beijing 100193,China.

出　　处：《Biochar》2024年第1期1761-1774,共14页生物炭(英文)

基　　金：supported by the Project of Sanya Yazhou Bay Science and Technology City(Grant number SCKJ-JYRC-2023-13);the Hainan Provincial Natural Science Foundation of China(Grant number 223QN190);the Hainan University Startup Fund(Grant number KYQD(ZR)-22104);the Collaborative Innovation Center for Southern and Tropical Efficient Agriculture(Grant number XTCX2022NYC08).

摘　　要：Chitin and phytic acid are abundant sustainable resources commonly found in shrimp shells,crab shells,and various plants.However,they are underutilized,and their biomass value is frequently underestimated.To address this,the current study developed a strategy to synthesize efficient separator coatings for zinc-iodine(Zn-I)batteries using chitin and phytic acid as carbon sources(biochar).First,nanosheets of porous carbon doped with N and P(NP-PC),featuring multiple active sites,are synthesized through in situ carbonization of chitin and phytic acid.Subsequently,the synthesized materials are coated onto the surfaces of glass fiber(GF)separators,effectively addressing several persistent challenges associated with Zn-I batteries.Notably,the modified separator(NP-PC@GF)enhanced the rapiddischarge capability of the involved battery,effectively inhibited the diffusion of intermediate polyiodide species,stabilized the electrolyte interface,suppressed irreversible dendrite formation,and increased I utilization efficiency.Consequently,the battery demonstrated high electrochemical performance,with an initial capacity of 7.8 mAh cm^(-2)at 20 mA cm^(-2),an initial specific capacity of 8.9 mAh cm^(-2)under high I loading,and a retention rate of 56%(5.1 mAh cm^(-2))at the 174th cycle.Overall,this research demonstrates the effective use of biochar for separator modification,facilitating the development of high-performance Zn-I batteries.

关 键 词：Phytic acid CHITIN BIOCHAR Zinc-iodine battery 

分 类 号：TM91[电气工程—电力电子与电力传动]