Silicon is one of the most promising anode materials for lithium-ion batteries due to its low cost, high energy density and abundant resources. However, fast capacity decay caused by the huge volume changes and the unstable solid electrolyte interface (SEI) limits its commercial applications. In this work, the effects of lithium hexafluorophosphate (LiPF₆) and lithium difluoroacetate borate (LiDFOB) on the performance of microsized silicon anode were compared using nonflammable pure trimethyl phosphate (TMP) as the solvent. It is found that microsized silicon anode with 1M LiDFOB /TMP electrolyte can produce a more stable solid electrolyte interface (SEI), which effectively prevents capacity loss. The capacity has a high retention even after 100 cycles with nearly 100% coulombic efficiency. Moreover, 5V-class cathode shows a better cycling stability with LiDFOB salt. This work may provide a novel direction for expanding the fields of lithium-ion batteries anode which has high safety and high energy density.

硅由于其低成本，高能量密度和丰富的资源，是锂离子电池最有希望的负极材料之一。然而，巨大的体积变化和不稳定的固体电解质界面（SEI）引起的快速容量衰减限制了其商业应用。在这项工作中，六氟磷酸锂（LiPF ₆）和二氟乙酸硼酸锂（LiDFOB）在不易燃的纯磷酸三甲酯（TMP）作为溶剂的情况下进行了比较。发现具有1M LiDFOB / TMP电解质的微型硅阳极可产生更稳定的固体电解质界面（SEI），从而有效防止容量损失。即使经过100次循环，容量仍具有很高的保持力，库仑效率接近100％。此外，使用LiDFOB盐，5V级阴极显示出更好的循环稳定性。这项工作可以为扩展锂离子电池负极的安全性和能量密度高的领域提供新的方向。