Towards high energy density sodium ion batteries through electrolyte optimization
Journal article, 2013

A comprehensive study is reported entailing optimization of sodium ion electrolyte formulation and compatibility studies with positive and negative electrode materials. EC:PC:DMC and EC:PC:DME were found to exhibit optimum ionic conductivities and lower viscosities. Yet, hard carbon negative electrode materials tested in such electrolytes exhibit significant differences in performance, rooted in the different resistivity of the SEI, which results in too large polarization and concomitant loss of capacity at low potentials when DME is used as a co-solvent. EC0.45:PC0.45:DMC0.1 was found to be the optimum composition resulting in good rate capability and high capacity upon sustained cycling for hard carbon electrodes. Its compatibility with positive Na3V2(PO4)(2)F-3 (NVPF) electrodes was also confirmed, which led to the assembly of full Na-ion cells displaying an operation voltage of 3.65 V, very low polarisation and excellent capacity retention upon cycling with ca. 97 mA h g(-1) of NVPF after more than 120 cycles together with satisfactory coulombic efficiency (>98.5%) and very good power performance. Such values lead to energy densities comparable to those of the current state-of-the-art lithium-ion technology.

Author

A. Ponrouch

Institute of Material Science of Barcelona (ICMAB)

Alistore - European Research Institute

R. Dedryvere

Alistore - European Research Institute

Universite de Pau et des Pays de L'Adour

Centre national de la recherche scientifique (CNRS)

Damien Monti

Chalmers, Applied Physics, Condensed Matter Physics

A. E. Demet

Institut de Chimie de la Matiere Condensee de Bordeaux

J. M. A. Mba

Institut de Chimie de la Matiere Condensee de Bordeaux

University of Picardie Jules Verne

Alistore - European Research Institute

L. Croguennec

Institut de Chimie de la Matiere Condensee de Bordeaux

Centre national de la recherche scientifique (CNRS)

Alistore - European Research Institute

C. Masquelier

University of Picardie Jules Verne

Alistore - European Research Institute

Centre national de la recherche scientifique (CNRS)

Patrik Johansson

Chalmers, Applied Physics, Condensed Matter Physics

M. R. Palacin

Institute of Material Science of Barcelona (ICMAB)

Alistore - European Research Institute

Energy and Environmental Sciences

1754-5692 (ISSN) 17545706 (eISSN)

Vol. 6 8 2361-2369

Areas of Advance

Transport

Energy

Materials Science

Subject Categories

Condensed Matter Physics

DOI

10.1039/c3ee41379a

More information

Latest update

9/7/2018 1