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The influence of synthesis routes on the crystallography, morphology and electrochemistry of Li2MnO3

DOI: 10.1021/acsami.9b20754 DOI Help

Authors: Ashok Sreekumar Menon (Uppsala University) , Dickson O. Ojwang (Uppsala University) , Tom Willhammar (Stockholm University) , Vanessa K. Peterson (University of Wollongong; Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organization) , Kristina Edstrom (Uppsala University) , Cesar Pay Gòmez (Uppsala University) , William R. Brant (Uppsala University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Applied Materials & Interfaces

State: Published (Approved)
Published: January 2020
Diamond Proposal Number(s): 19093

Abstract: With the potential of delivering reversible capacities of up to 300 mAh/g, Li-rich transition metal oxides hold great promise as cathode materials for future Li-ion batteries. However, a cohesive synthesis-structure-electrochemistry relationship is still lacking for these materials, which impedes progress in the field. This work investigates how and why different synthesis routes, specifically solid-state and modified Pechini sol-gel methods, affect the properties of Li2MnO3, a compositionally simple member of this material system. Through a comprehensive investigation of the syn-thesis mechanism along with crystallographic, morphological and electrochemical characterization, the effects of different synthesis routes were found to predominantly influence the degree of stacking faults and particle morphology. That is, the modified Pechini method produced isotropic spherical particles with approx. 57% faulting and the solid state samples possessed heterogeneous morphology with approx. 43% faulting probability. Inevitably, these differences lead to variations in electrochemical performance. This study accentuates the importance of understanding how syn-thesis affects the electrochemistry of these materials, which is critical considering the crystallographic and electrochemical complexities of the class of materials more generally. The methodology employed here is extendable to studying synthesis-property relationships of other compositionally complex Li-rich layered oxide systems.

Journal Keywords: Li-rich layered oxides; synthesis-property relationship; Li2MnO3; stacking faults; cathode materials

Diamond Keywords: Batteries; Lithium-ion

Subject Areas: Materials, Chemistry, Energy

Instruments: I11-High Resolution Powder Diffraction

Added On: 13/01/2020 10:44

Discipline Tags:

Physical Chemistry Energy Energy Storage Materials Science Energy Materials Chemistry

Technical Tags:

Diffraction X-ray Powder Diffraction