Insight into the Improved Performances of Ni-Rich/Graphite Cells by 1,3,5-Trimethyl-1,3,5-tris(3,3,3-trifluoropropyl) Cyclotrisiloxane as an Electrolyte Additive,ACS Applied Energy Materials

当前位置： X-MOL 学术 › ACS Appl. Energy Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Insight into the Improved Performances of Ni-Rich/Graphite Cells by 1,3,5-Trimethyl-1,3,5-tris(3,3,3-trifluoropropyl) Cyclotrisiloxane as an Electrolyte Additive
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2022-08-24 , DOI: 10.1021/acsaem.2c02160
Jialuo Lin ₁ , Yuxian Yang ₁ , Xiaoyan Lin ₁ , Guanjie Li ₁ , Wenguang Zhang ₁ , Weishan Li _{1,

2}

Affiliation

A Ni-rich cathode is one of the representatives for lithium-ion batteries that can deliver a higher energy density with lower cost than any other counterparts, but its cyclic stability is unsatisfactory. 1,3,5-Trimethyl-1,3,5-tris(3,3,3-trifluoropropyl) cyclotrisiloxane (D₃F) as an electrolyte additive is effective for performance improvement of the Ni-rich cathode. Evaluated in a cell based on the Ni-rich cathode (LiNi_0.8Co_0.1Mn_0.1O₂, NCM811) and a graphite anode in 1 M LiPF₆-EMC/EC/DEC (3/5/2 in weight) between 3.0 and 4.35 V, the application of 5% D₃F without any co-contribution of other electrolyte additives enhances the capacity retention of the cell from 38 to 76% after 300 cycles at 1C. The underlying mechanism is understood by combining theoretical calculation with physical characterization and electrochemical measurements. D₃F can be electrochemically oxidized and reduced preferentially compared to the electrolyte components, creating robust interphases simultaneously on the cathode and anode. Additionally, it can scavenge HF and eliminates its detrimental effect on battery performances. This understanding helps to further enhance the performance of Ni-rich/graphite cells via designing electrolyte additives.

中文翻译：

1,3,5-Trimethyl-1,3,5-tris(3,3,3-trifluoropropyl) Cyclotrisiloxane 作为电解质添加剂对富镍/石墨电池性能的改进

富镍正极是锂离子电池的代表之一，它可以以比其他同类电池更低的成本提供更高的能量密度，但其循环稳定性并不令人满意。1,3,5-Trimethyl-1,3,5-tris(3,3,3-trifluoropropyl) cyclotrisiloxane (D ₃ F) 作为电解质添加剂可有效提高富镍正极的性能。在基于富镍阴极 (LiNi _0.8 Co _0.1 Mn _0.1 O ₂ , NCM811) 和石墨阳极的电池中评估，1 M LiPF ₆ -EMC/EC/DEC（重量为 3/5/2）介于 3.0 和4.35 V, 5% D _3的应用在 1C 下循环 300 次后，没有任何其他电解质添加剂的 F 可将电池的容量保持率从 38% 提高到 76%。通过将理论计算与物理表征和电化学测量相结合来理解潜在的机制。与电解质组分相比， D ₃ F 可以优先被电化学氧化和还原，从而在阴极和阳极上同时产生坚固的界面。此外，它可以清除 HF 并消除其对电池性能的不利影响。这种理解有助于通过设计电解质添加剂进一步提高富镍/石墨电池的性能。

更新日期：2022-08-24

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南