Green and High-Yield Recovery of Phosphorus from Municipal Wastewater for LiFePO_(4)Batteries  

作　　者：Yijiao Chang Xuan Wang Bolin Zhao Anjie Li Yiru Wu Bohua Wen Bing Li Xiao-Yan Li Lin Lin 

机构地区：[1]Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China [2]Key Laboratory of Water and Sediment Sciences of Ministry of Education,State Key Laboratory of Water Environment Simulation,School of Environment,Beijing Normal University,Beijing 100875,China [3]Institute of Materials Research,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China [4]School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [5]Environmental Engineering Research Centre,Department of Civil Engineering,The University of Hong Kong,Hong Kong 999077,China

出　　处：《Engineering》2025年第2期234-242,共9页工程(英文)

基　　金：supported by the National Natural Science Foundation of China(52100093,52270128,and 52261135627);the Guangdong Basic and Applied Basic Research Foundation(2023A1515011734 and 2021B1515120068);the Municipal Science and Technology Innovation Council of the Shen-zhen Government(KCXFZ20211020163556020 and SGDX20230116092359002);the Research Grants Council(17210219);the Innovation and Technology Fund(ITS/242/20FP)of the Hong Kong SAR Government。

摘　　要：The rapidly growing demand for lithium iron phosphate(LiFePO_(4))as the cathode material of lithium-ion batteries(LIBs)has aggravated the scarcity of phosphorus(P)reserves on Earth.This study introduces an environmentally friendly and economical method of P recovery from municipal wastewater,providing the P source for LiFePO_(4) cathodes.The novel approach utilizes the sludge of Fe-coagulant-based chemical P removal(CPR)in wastewater treatment.After a sintering treatment with acid washing,the CPR sludge,enriched with P and Fe,transforms into purified P-Fe oxides(Fe2.1P1.0O5.6).These oxides can substitute up to 35%of the FePO_(4) reagent as precursor,producing a carbon-coated LiFePO_(4)(LiFePO_(4)/C)cathode with a specific discharge capacity of 114.9 mA·h·g^(-1)at current density of 17 mA·g^(-1)),and cycle stability of 99.2%after 100 cycles.The enhanced cycle performance of the as-prepared LiFePO_(4)/C cathode may be attributed to the incorporations of impurities(such as Ca^(2+)and Na^(+))from sludge,with improved stability of crystal structure.Unlike conventional P-fertilizers,this P recovery technology converts 100%of P in CPR sludge into the production of value-added LiFePO_(4)/C cathodes.The recovered P from municipal wastewater can meet up to 35%of the P demand in the Chinese LIBs industry,offering a cost-effective solution for addressing the pressing challenges of P scarcity.

关 键 词：Municipal wastewater Chemical phosphorus removal sludge Lithium iron phosphate Lithium-ion batteries Phosphorus recovery 

分 类 号：X703[环境科学与工程—环境工程]