24 Feb '18, 11am

Researchers use Mg salt additive to suppress Li dendrites; more work needed to enhance Coulombic efficiency

Researchers use Mg salt additive to suppress Li dendrites; more work needed to enhance Coulombic efficiency

The use of a Mg salt-free electrolyte (1 M LiTFSA/G3) inevitably resulted in the growth of Li dendrites irrespective of the applied potential, with no improvements observed at a Mg(TFSA)2 :LiTFSA molar ratio of 1:9. In contrast, Mg was deposited prior to Li in 0.5 M Mg(TFSA)2 + 0.5 M LiTFSA/G3, which resulted in electrochemical Li–Mg alloying. In the above system, the products formed at various applied potentials after 10 h corresponded to Li0.9 Mg0.1 and exhibited a relatively smooth morphology. However, under constant current condition, although Li dendrite morphology was suppressed with increasing Mg-salt concentration in the electrolytes, their Coulombic efficiencies were not high. This is probably because the ion conduction was inhibited by the surface layer induced by the electrolyte decomposition and the passivation of Mg metal suppressed the dissolution. To enhance...

Full article: http://www.greencarcongress.com/2018/02/20180224-shimizu....

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