期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 43, 页码 39715-39721出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b08703
关键词
LiCO2CF3; Li-metal battery; high voltage; high concentration; ether electrolyte
资金
- National Key Research and Development Program of China [2017YFB0102000]
- National Natural Science Foundation of China [21603179, 21621091]
- Fundamental Research Funds for the Central Universities [20720170021]
Lithium-metal batteries have attracted extensive attention due to the increasing demand for storage devices with high energy density. For the modification of lithium-metal battery, how to effectively inhibit the growth of lithium dendrites has become a key challenge. Ether electrolytes have been widely used owing to their good compatibility with lithium metal. However, they are still difficult to be applied in high-voltage battery systems because of the poor cathodic stability. In this work, we have dissolved the lithium carboxylate, LiCO2CF3, into a dimethyl ether-based ether solvent to achieve a relatively outstanding performance in both positive and negative electrodes. Using this dilute ether electrolyte (1 mol L-1), the Li parallel to Cu half-cells retain a Coulombic efficiency of 98.5% after 100 cycles at the current density of 1 mA cm(-2) and lithium deposition amount of 1 mAh cm(-2) for each cycle. Meanwhile, the Li parallel to NCM523 full-batteries also realize a capacity retention of nearly 80% after 100 cycles in the voltage range of 3.0-4.3 V. Moreover, when the concentration increases to 5 mol L-1, the Coulombic efficiency of the half-cells stabilizes at around 99.0% after 250 cycles under the condition of 1 mA cm(-2) current density along with the average Coulombic efficiency of as high as 98.4% and the capacity retention rate of the full-batteries is nearly 95.4% after 100 cycles and over 83.8% after 200 cycles.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据