Optimizing Calcium Electrolytes by Solvent Manipulation for Calcium Batteries,Batteries & Supercaps

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Optimizing Calcium Electrolytes by Solvent Manipulation for Calcium Batteries
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-03-22 , DOI: 10.1002/batt.202000005
Kevin V. Nielson ₁ , Jian Luo ₁ , T. Leo Liu ₁

Affiliation

Calcium is a highly attractive metal anode because of its high earth abundance and low reduction potential. However, the lack of calcium electrolytes for reversible calcium deposition significantly hampers the development of Ca rechargeable batteries. Herein, the calcium deposition/stripping behaviors of a calcium salt electrolyte, Ca[B(hfip)₄]₂ ([B(hfip)₄]⁻=tetrakis(hexafluoroisopropyloxy)borate) were systematically studied using different working electrodes (GC, Pt, Cu, and Al) and different solvents including tetrahydrofuran (THF), dimethoxyethane (DME), and diglyme (DGM). It was found that the Ca[B(hfip)₄]₂/DGM electrolyte demonstrated the highest reversibility and stability in cyclic voltammetry and symmetric Ca/Ca half‐cell studies. The Ca[B(hfip)₄]₂/DGM electrolyte was further employed to demonstrate a 3.4 V Ca battery using a FePO₄ cathode with a discharge capacity of 120 Ah/mg.

中文翻译：

通过溶剂操纵优化钙电池中的钙电解质

钙由于其高的土壤丰度和低的还原电位而成为极具吸引力的金属阳极。然而，缺乏用于可逆钙沉积的钙电解质显着阻碍了钙可再充电电池的发展。在本文中，使用不同的工作电极（GC，Pt）系统地研究了钙盐电解质Ca [B（hfip）₄ ] ₂（[B（hfip）₄ ] ^- =四（六氟异丙氧基）硼酸酯）的钙沉积/剥离行为，Cu和Al）以及不同的溶剂，包括四氢呋喃（THF），二甲氧基乙烷（DME）和二甘醇二甲醚（DGM）。发现Ca [B（hfip）₄ ] ₂/ DGM电解质在循环伏安法和对称的Ca / Ca半电池研究中显示出最高的可逆性和稳定性。进一步采用Ca [B（hfip）₄ ] ₂ / DGM电解质来演示3.4 V Ca电池，该电池使用的FePO ₄阴极的放电容量为120 Ah / mg。

更新日期：2020-03-22

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