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Highly Concentrated and Nonflammable Electrolyte for High Energy Density K-Based Dual-Ion Battery
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-09-25 , DOI: 10.1021/acsaem.0c01993 Xuewu Ou 1 , Jin Li 1, 2 , Xiaoyu Tong 1, 2 , Ge Zhang 1, 3 , Yongbing Tang 1, 2, 4
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-09-25 , DOI: 10.1021/acsaem.0c01993 Xuewu Ou 1 , Jin Li 1, 2 , Xiaoyu Tong 1, 2 , Ge Zhang 1, 3 , Yongbing Tang 1, 2, 4
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K-based dual-ion batteries (K-DIBs) show the advantages of being cost-effective, high-voltage, and environmentally friendly; however, their energy density is restricted by limited intercalation capacity of anions at the graphite cathode and low electrolyte concentration. Herein, we developed a highly concentrated electrolyte system by dissolving 6.6 m potassium bis(fluorosulfonyl)imide (KFSI) into nonflammable trimethyl phosphate (TMP). Advantages exhibited by this concentrated KFSI/TMP electrolyte include (1) high oxidation potential (over 5.4 V) that improves the intercalation reversibility and capacity of FSI– anions at the graphite cathode side; (2) enhanced cycling performance of tin (Sn) foil anode; and (3) remarkably improved energy density of K-DIBs. With the concentrated electrolyte system, a proof-of-concept K-DIB constructed with a graphite cathode and a Sn foil anode displays a high specific discharge capacity of 93.6 mA h g–1 at 300 mA g–1 and energy density of ∼144 W h kg–1 (including electrode active materials and electrolytes), which are among the best results compared with previously reported K-DIBs.
中文翻译：
高浓度，非易燃电解质，用于高能量密度钾基双离子电池
基于K的双离子电池（K-DIB）具有成本低廉，高压且环保的优点；然而，它们的能量密度受到石墨阴极上阴离子的有限插入容量和低电解质浓度的限制。在这里，我们通过将6.6 m的双（氟磺酰基）酰亚胺钾盐（KFSI）溶解在不易燃的磷酸三甲酯（TMP）中，开发了一种高度浓缩的电解质系统。这种浓缩的KFSI / TMP电解质展现出的优势包括：（1）高氧化电位（超过5.4 V），可改善FSI的插层可逆性和容量–石墨阴极侧的阴离子；（2）增强锡（Sn）箔阳极的循环性能；（3）显着提高了K-DIB的能量密度。在浓缩电解质系统中，由石墨阴极和锡箔阳极构成的概念验证K-DIB在300 mA g –1时显示出93.6 mA hg –1的高比放电容量，能量密度约为144 W h kg –1（包括电极活性材料和电解质），与以前报道的K-DIB相比，是最好的结果。
更新日期：2020-10-26
中文翻译：
高浓度，非易燃电解质，用于高能量密度钾基双离子电池
基于K的双离子电池（K-DIB）具有成本低廉，高压且环保的优点；然而，它们的能量密度受到石墨阴极上阴离子的有限插入容量和低电解质浓度的限制。在这里，我们通过将6.6 m的双（氟磺酰基）酰亚胺钾盐（KFSI）溶解在不易燃的磷酸三甲酯（TMP）中，开发了一种高度浓缩的电解质系统。这种浓缩的KFSI / TMP电解质展现出的优势包括：（1）高氧化电位（超过5.4 V），可改善FSI的插层可逆性和容量–石墨阴极侧的阴离子；（2）增强锡（Sn）箔阳极的循环性能；（3）显着提高了K-DIB的能量密度。在浓缩电解质系统中，由石墨阴极和锡箔阳极构成的概念验证K-DIB在300 mA g –1时显示出93.6 mA hg –1的高比放电容量，能量密度约为144 W h kg –1（包括电极活性材料和电解质），与以前报道的K-DIB相比，是最好的结果。
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