Self-Assembly of Antisite Defectless nano-LiFePO4 @C/Reduced Graphene Oxide Microspheres for High-Performance Lithium-Ion Batteries

Hongbin Wang; Lijia Liu; Runwei Wang; Xiao Yan; Ziqi Wang; Jiangtao Hu; Haibiao Chen; Shang Jiang; Ling Ni; Hailong Qiu; Haitong Tang; Yingjin Wei; Zongtao Zhang; Shilun Qiu; Feng Pan

doi:10.1002/cssc.201800786

Self-Assembly of Antisite Defectless nano-LiFePO₄ @C/Reduced Graphene Oxide Microspheres for High-Performance Lithium-Ion Batteries

ChemSusChem. 2018 Jul 11;11(13):2255-2261. doi: 10.1002/cssc.201800786. Epub 2018 Jun 19.

Authors

Hongbin Wang^{1

2}, Lijia Liu¹, Runwei Wang¹, Xiao Yan³, Ziqi Wang², Jiangtao Hu², Haibiao Chen², Shang Jiang¹, Ling Ni¹, Hailong Qiu⁴, Haitong Tang¹, Yingjin Wei⁴, Zongtao Zhang^{1

4}, Shilun Qiu¹, Feng Pan²

Affiliations

¹ State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, International Joint Research Laboratory, of Nano-Micro Architecture Chemistry, Jilin University, Changchun, 130012, PR China.
² School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen, 518055, PR China.
³ School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116, PR China.
⁴ Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, Jilin University, Changchun, 130012, PR China.

PMID: 29775247
DOI: 10.1002/cssc.201800786

Abstract

LiFePO₄ @C/reduced graphene oxide (rGO) hierarchical microspheres with superior electrochemical activity and a high tap density were first synthesized by using a Fe³⁺ -based single inorganic precursor (LiFePO₄ OH@RF/GO; RF=resorcinol-formaldehyde, GO=graphene oxide) obtained from a template-free self-assembly synthesis followed by direct calcination. The synthetic process requires no physical mixing step. The phase transformation pathway from tavorite LiFePO₄ OH to olivine LiFePO₄ upon calcination was determined by means of the in situ high-temperature XRD technique. Benefitting from the unique structure of the material, these microspheres can be densely packed together, giving a high tap density of 1.3 g cm^-3 , and simultaneously, defectless LiFePO₄ primary nanocrystals modified with a highly conductive surface carbon layer and ultrathin rGO provide good electronic and ionic kinetics for fast electron/Li⁺ ion transport.

Keywords: batteries; hierarchical microspheres; iron phosphate; lithium; reduced graphene oxide.