start-ver=1.4 cd-journal=joma no-vol=162 cd-vols= no-issue=2 article-no= start-page=1322 end-page=1328 dt-received= dt-revised= dt-accepted= dt-pub-year=2006 dt-pub=200610 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Properties of a novel hard-carbon optimized to large size Lion secondary battery studied by 7Li NMR en-subtitle= kn-subtitle= en-abstract= kn-abstract=

The state of lithium in a novel hard-carbon optimized to the anode of large size Li ion secondary battery, which has been recently commercialized, was investigated and compared with other existing hard-carbon samples by 7Li NMR method. The new carbon material showed a peak at 85 ppm with a shoulder signal at 7 ppm at room temperature in static NMR spectrum, and the former shifted to 210 ppm at 180 K. The latter at room temperature was attributed to Li doped in small particles contained in the sample. The new carbon sample showed weaker intensity of cluster-lithium signal than the other hard-carbon samples in NMR, which corresponded to a tendency of less "Constant Voltage" (CV) capacity in charge-discharge curves of electrochemical evaluation. Smaller CV capacity and initial irreversible capacity, which are the features of the novel hard-carbon, are considered to correspond to a blockade of the diffusion of Li into pore of carbon.

en-copyright= kn-copyright= en-aut-name=GotohKazuma en-aut-sei=Gotoh en-aut-mei=Kazuma kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=MaedaMariko en-aut-sei=Maeda en-aut-mei=Mariko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=NagaiAisaku en-aut-sei=Nagai en-aut-mei=Aisaku kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=GotoAtsushi en-aut-sei=Goto en-aut-mei=Atsushi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=TanshoMasataka en-aut-sei=Tansho en-aut-mei=Masataka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=HashiKenjiro en-aut-sei=Hashi en-aut-mei=Kenjiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=ShimizuTadashi en-aut-sei=Shimizu en-aut-mei=Tadashi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=IshidaHiroyuki en-aut-sei=Ishida en-aut-mei=Hiroyuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Kureha Corporation affil-num=3 en-affil= kn-affil=Kureha Corporation affil-num=4 en-affil= kn-affil=National Institute for Materials Science affil-num=5 en-affil= kn-affil=National Institute for Materials Science affil-num=6 en-affil= kn-affil=National Institute for Materials Science affil-num=7 en-affil= kn-affil=National Institute for Materials Science affil-num=8 en-affil= kn-affil=Okayama University en-keyword=hard carbon kn-keyword=hard carbon en-keyword=Lithium kn-keyword=Lithium en-keyword=battery kn-keyword=battery en-keyword=7Li NMR kn-keyword=7Li NMR en-keyword=anode kn-keyword=anode en-keyword=electric vehicle kn-keyword=electric vehicle END