Our study shows that 3, 3′-sulfonyldipropionitrile (SDPN), as an electrolyte additive, can dramatically enhance the performance of LiNi_1/3Co_1/3Mn_1/3O₂/graphite lithium-ion batteries (LIBs) at high voltages (3.0–4.6 V vs. Li/Li⁺). After adding 0.2 wt% SDPN to the electrolytes; i.-e., 1.0 M LiPF₆-EC/DMC/EMC, the capacity for the LiNi_1/3Co_1/3Mn_1/3O₂/graphite cell to retain power was significantly increased from 59.5% to 77.3% after only 100 cycles, which shows the promising application of SDPN at higher voltages. Density functional theory calculation results indicate that SDPN had reduced oxidative constancy compared to ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC). The effects of SDPN on cell performance are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). The testing results indicate that the improvement in cycling activity could be ascribed to the thinner cathode electrolyte interface film originated from SDPN on the LIB using LiNi_1/3Co_1/3Mn_1/3O₂, which reduced the interfacial resistance at a high voltage, but also protected the decomposition of electrolytes and suppressed transition metal dissolution.

我们的研究表明，作为电解质添加剂的3，3'-磺酰基二丙腈（SDPN）可以显着提高LiNi _1/3 Co _1/3 Mn _1/3 O ₂ /石墨锂离子电池（LIBs）的性能。电压（相对于Li / Li ^+为3.0–4.6 V ）。在向电解质中添加0.2重量％的SDPN后；即1.0 M LiPF ₆ -EC / DMC / EMC，LiNi _1/3 Co _1/3 Mn _1/3 O ₂的容量仅100次循环后，石墨电池的保留功率就从59.5％显着提高到77.3％，这表明SDPN在更高电压下的应用前景广阔。密度泛函理论计算结果表明，与碳酸亚乙酯（EC），碳酸二甲酯（DMC）和碳酸乙基甲基酯（EMC）相比，SDPN的氧化常数降低。SDPN对电池性能的影响通过扫描电子显微镜（SEM），透射电子显微镜（TEM），电化学阻抗谱（EIS）和X射线光电子能谱（XPS）来表征。测试结果表明，使用LiNi _1/3 Co _1/3 Mn _1/3可以使锂离子电池上的SDPN阴极阴极界面膜更薄，从而改善循环活性。O ₂降低了高电压下的界面电阻，但也保护了电解质的分解并抑制了过渡金属的溶解。