Pyrite FeS2 has been successfully applied in primary Li/FeS2 batteries, but its poor cyclability in traditional carbonate-based electrolytes seriously hinders its application in rechargeable batteries. To overcome this issue, efforts have been made to focus on the modification of FeS2. However, it is still difficult to improve the electrode performance especially for bare FeS2. Herein, we report that changing carbonate-based electrolytes to selected ether-based lithium bis(trifluoromethanesulfonyl) imide and diglyme electrolytes greatly enhances the reversibility of the electrochemical reaction. FeS2 microspheres with a high tap density of 2.2 g cm(-3) show the stable discharge capacities of 680 mA h g(-1) at 100 mA g(-1) and 412 mA h g(-1) even at 6000 mA g(-1). Moreover, the capacity retention is 90% after 100 cycles at 1000 mA g(-1). The main reason for the long cycling is to inhibit the side reaction of the intermediate polysulfides with electrolytes.
展开▼
机译：黄铁矿FeS2已成功应用于一次Li / FeS2电池，但其在传统碳酸盐基电解液中的循环性差，严重阻碍了其在可充电电池中的应用。为了克服这个问题，已经进行了努力以致力于FeS 2的改性。然而，尤其是对于裸FeS 2而言，仍然难以改善电极性能。在此，我们报道了将碳酸盐基电解质更改为选定的醚基双（三氟甲磺酰基）酰亚胺锂和二甘醇二甲醚电解质大大提高了电化学反应的可逆性。具有2.2 g cm（-3）的高抽头密度的FeS2微球在100 mA g（-1）和412 mA hg（-1）时显示稳定的放电容量，即使在6000 mA g（-1）时也是如此-1）。此外，在1000 mA g（-1）下进行100次循环后，容量保持率为90％。长循环的主要原因是抑制中间多硫化物与电解质的副反应。
展开▼
