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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 4    April 2018

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Influence of CsNO3 as electrolyte additive on electrochemical property of lithium anode in rechargeable battery
LIN Hua(林华)1, CHEN Kang-hua(陈康华)1, 2, SHUAI Yi(帅毅)2, HE Xuan(何璇)1, GE Ke(葛科)2

1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Light Alloy Research Institute, Central South University, Changsha 410083, China

Abstract:Lithium metal is one of the most promising anode materials for rechargeable battery with high energy density, but its practical use is still hindered by two main problems, namely, lithium dendrite growth and low Coulombic efficiency. To address the issues, cesium nitrate (CsNO3) is selected as the additive to modify the electrolyte for lithium secondary battery. Here we report electrochemical performance of lithium secondary battery with different concentration of CsNO3 as electrolyte additive. The study result demonstrates that Coulombic efficiency of Li–Cu cells and the lifetime of symmetric lithium cells contained CsNO3 additive are improved greatly. Li–Cu cell with 0.05 mol/L CsNO3 and 0.15 mol/L LiNO3 as electrolyte additive presents the best electrochemical performance, having the highest Coulombic efficiency of around 97% and the lowest interfacial resistance. With increasing the concentration of CsNO3 as electrolyte additive, the electrochemical performance of cells becomes poor. Meanwhile, the morphology of lithium deposited films with CsNO3-modified electrolyte become smoother and more uniform compared with the basic electrolyte.

 

Key words: cesium nitrate; lithium anode; electrolyte additive; Coulombic efficiency; electrochemical properties; morphology

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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