Trace Multifunctional Additive Enhancing 4.8 V Ultra-High Voltage Performance of Ni-Rich Cathode and SiOx Anode Battery

IF 24.4 1区 材料科学 Q1 CHEMISTRY, PHYSICAL Advanced Energy Materials Pub Date : 2024-12-02 DOI:10.1002/aenm.202403751
Yujing Zhang, Yiming Zhang, Xiaoyi Wang, Haochen Gong, Yu Cao, Kang Ma, Shaojie Zhang, Shaowei Wang, Wensheng Yang, Lve Wang, Jie Sun
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Abstract

The combination of high-voltage Ni-rich cathodes and high-capacity Si-based anodes can result in high energy density for next-generation batteries. However, the practical capacities accesses are severely hindered by unstable electrode/electrolyte interphases (EEI) and irreversible structural degradation, which necessitates efficient additives in electrolyte for generating stable EEI. Herein, a multifunctional additive, 3-Fluoro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)picolinonitrile (FTDP) is proposed to construct robust interfaces at both cathodic and anodic surface, so as to enhance electrochemical performance. FTDP is preferentially decomposed to form B-contained and cyano (CN) group-rich cathode electrolyte interphase (CEI), as well as LiF-, Li3N-rich solid electrolyte interphase (SEI), simultaneously, resulting in the integrity and stability of electrodes. Moreover, the FTDP-derived CEI can suppress transition metal ions dissolution, further facilitating battery cyclability. The multifunctionality of FTDP, including quenching free radicals, alleviating the hydrolysis of LiPF6 and inhibiting HF generation, thus greatly improving interfacial stability. With trace addition of 0.2 wt.%, NCM811/Li cell can be performed at an extreme condition, i.e., ultra-high voltage (4.8 V), high temperature (60 °C) and high rate (10C). 1.6 Ah NCM811/SiOx pouch cell delivers a high capacity retention of 84.0% after 300 cycles.

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微量多功能添加剂增强富镍阴极和氧化硅阳极电池4.8 V超高压性能
高压富镍阴极和高容量硅基阳极的结合可以为下一代电池带来高能量密度。然而,不稳定的电极/电解质界面(EEI)和不可逆的结构降解严重阻碍了实际容量的获取,这就需要在电解质中添加高效的添加剂来产生稳定的EEI。本文提出了一种多功能添加剂- 3-氟-5-(4,4,5,5-四甲基-1,3,2-二恶硼硼-2-基)吡啶腈(FTDP),用于在阴极和阳极表面构建坚固的界面,从而提高电化学性能。FTDP优先分解,同时形成含b、富氰(CN)基团的阴极电解质界面(CEI)和富LiF、li3n的固体电解质界面(SEI),保证了电极的完整性和稳定性。此外,ftdp衍生的CEI可以抑制过渡金属离子的溶解,进一步促进电池的可循环性。FTDP具有猝灭自由基、缓解LiPF6水解和抑制HF生成的多功能性,从而大大提高了界面稳定性。微量添加0.2 wt.%, NCM811/Li电池可以在极端条件下工作,即超高压(4.8 V)、高温(60°C)和高倍率(10°C)。1.6 Ah的NCM811/SiOx袋电池在300次循环后可提供84.0%的高容量保持率。
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来源期刊
Advanced Energy Materials
Advanced Energy Materials CHEMISTRY, PHYSICAL-ENERGY & FUELS
CiteScore
41.90
自引率
4.00%
发文量
889
审稿时长
1.4 months
期刊介绍: Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small. With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics. The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.
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