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Improved Electrochemical Performance of Modified Mesocarbon Microbeads for Lithium‐Ion Batteries Studied using Solid‐State Nuclear Magnetic Resonance Spectroscopy
Author(s) -
Bösebeck Katharina,
Chandran C. Vinod,
Licht Björn K.,
Binnewies Michael,
Heitjans Paul
Publication year - 2016
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201600211
Subject(s) - graphite , solid state nuclear magnetic resonance , lithium (medication) , materials science , electrochemistry , electrolyte , copper , ion , fast ion conductor , spectroscopy , ionic bonding , chemical engineering , chemistry , nuclear magnetic resonance , electrode , organic chemistry , composite material , metallurgy , medicine , physics , quantum mechanics , endocrinology , engineering
Abstract Lithium‐intercalating materials such as graphite are of great interest, especially for application in lithium‐ion batteries. In this work we present an investigation of the electrochemical performance of mesocarbon microbeads (MCMB) modified with copper to reveal the basic electrochemical mechanisms. Copper‐modified graphite is known to have better long‐term cycling behavior as well as higher capacity compared to the pristine material. Several reasons for these effects were postulated but not proven. Solid‐state nuclear magnetic resonance (NMR) spectroscopy provides structural and dynamic information on lithium in ionic conductors. To elucidate the changes in structure and dynamics for the pristine and the modified material, we have employed multi‐nuclear solid‐state NMR spectroscopy as well as 7 Li spin‐lattice relaxation measurements and were able to clarify some reasons for the improved characteristics of copper‐modified graphite compared to the pristine material, which include increased solid–electrolyte interface (SEI) formation, a facilitated diffusion of lithium ions through the SEI, and reduced moisture.