双（2,2,2-三氟乙基）碳酸酯和丁二腈协同抑制镍溶解以提高富镍锂金属电池的性能,ACS Applied Energy Materials

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双（2,2,2-三氟乙基）碳酸酯和丁二腈协同抑制镍溶解以提高富镍锂金属电池的性能
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2022-10-23 , DOI: 10.1021/acsaem.2c02762
Luozeng Zhou _{1,

2} , Siyi Qian ₃ , Cheng Yang ₂ , Tingting Han ₂ , Yuanzhe Song ₂ , Yuzhuo Jiang ₃ , Huahui Zhang ₂ , Jianqin Zhang ₂ , Linsen Li ₁ , Jie Liu ₃ , Tao Qian ₃

Affiliation

富镍层状过渡金属（TM）氧化物正极材料因其在提高比能量和功率密度方面的重要作用而成为高能锂离子电池的潜在候选材料。^{然而，高活性Ni 4+}催化反应引起的电解液分解离子与溶解在电解质中的TM离子一起沉积在阳极表面最终会降低富镍锂金属电池的容量和循环稳定性。在此，双（2,2,2-三氟乙基）碳酸酯（BTFC）和丁二腈（SN）电解质通过构建可靠的保护电极抑制富镍锂金属电池中TM镍离子溶解的有效协同作用/报告了电解质界面。虽然 SN 用于提高电解质的电化学稳定性，但 BTFC 的氧化产物可以形成覆盖电极表面的致密稳定的钝化层。由于F键与高价Ni离子的强配位能力，阻止了混合电解质中TM镍离子的持续溶解。因此，与传统电解液相比，使用设计的电解液的 NCA||Li 电池在 100 次循环后容量保持率从 53.3% 明显提高到 82.1%。超120 mAh g的高比容量见证卓越的倍率性能^{–1在 1000 mA g}^–1的速率下。该结果为通过电解质操纵策略提高富镍锂金属电池的性能提供了见解。在本研究中对这种协同效应的基本机制的理解可能有助于开发具有用于下一代电池的先进富镍阴极的协同电解质。

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Synergistic Effect of Bis(2,2,2-trifluoroethyl) Carbonate and Succinonitrile in Suppressing the Dissolution of Nickel for Performance Improvement of Nickel-Rich Lithium Metal Batteries

Nickel-rich layered transition metal (TM) oxide cathode materials become the prospective candidates for high-energy lithium-ion batteries on account of their significant role in improving specific energy and power density. However, the decomposition of the electrolyte caused by the catalytic reaction of highly active Ni⁴⁺ ions together with the deposition of TM ions dissolved into the electrolyte upon the anode surface eventually deteriorates the capacity and cycling stability of nickel-rich lithium metal batteries. Herein, the effectively synergistic effect of a bis(2,2,2-trifluoroethyl) carbonate (BTFC) and succinonitrile (SN) electrolyte in suppressing the TM nickel ion dissolution in a nickel-rich lithium metal battery by building a reliable and protective electrode/electrolyte interface was reported. While SN was used to improve the electrochemical stability of the electrolyte, the oxidation products of BTFC can form a dense and stable passivated layer covering up the surface of the electrode. With the strong coordination ability of F bonding to the high-valence Ni ions, the continued TM nickel ion dissolution in the hybrid electrolyte was prevented. Thus, the NCA||Li cell with the designed electrolyte demonstrates an obvious improvement of capacity retention from 53.3% to 82.1% after 100 cycles compared with a conventional electrolyte. The remarkable rate performance is witnessed with high specific capacity over 120 mAh g^–1 at the rate of 1000 mA g^–1. The results provide insight into improving the performance of Ni-rich lithium metal batteries by the electrolyte manipulation strategy. The fundamental mechanism understanding of this synergistic effect in this study may facilitate the development of cooperative electrolytes with an advanced nickel-rich cathode for next-generation batteries.

更新日期：2022-10-23

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