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引用次数: 0
摘要
无钴锂镍氧化物(LNO)作为下一代电池中高镍层状氧化物阴极的最终成分,引起了人们的极大兴趣。然而,由于在循环过程中结构退化以及与电解质的界面化学性质不稳定,其实际性能明显低于预期。在此,我们报告了由原位形成的硫化物和硼化物富集而成的耐用阴极-电解质界面(CEI)可以抑制 LNO 的结构降解并抑制镍离子的溶解。在 CEI 的保护下,LNO 的稳定性显著提高,电池在 1C 下循环 200 次后,容量保持率分别为 84% (30 °C) 和 79% (50 °C) 。这些结果表明,用含硫物种富集 CEI 可以有效稳定 LNO 的界面化学性质,尤其是在 50 °C 的高温条件下。这一发现为无钴 LNO 和其他高镍正极的电解质设计提供了宝贵的视角,有助于开发新一代高能量密度锂离子电池。
Enabling High Stability of Co-Free LiNiO2 Cathode via a Sulfide-Enriched Cathode Electrolyte Interface
Cobalt-free lithium nickel oxide (LNO) has garnered significant interest as the end member of high-nickel layered oxide cathodes for next-generation batteries. However, its practical performance notably underperforms expectations because of the structural degradation and unstable interfacial chemistry with electrolytes during cycling. Here, we report that a durable cathode-electrolyte interface (CEI), enriched by in situ formed sulfides and borides, can inhibit LNO structural degradation and suppress Ni ion dissolution. With the CEI protection, the stability of LNO can be remarkably extended, and batteries demonstrate a capacity retention rate of 84% (30 °C) and 79% (50 °C) after 200 cycles at 1C, respectively. These results demonstrate that enriching CEI with sulfur-containing species can effectively stabilize the interfacial chemistry of LNO, particularly at an elevated temperature of 50 °C. This finding provides valuable perspectives on designing electrolytes for cobalt-free LNO and other high-Ni cathodes toward the development of next-generation high-energy-density lithium-ion batteries.
ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment
CiteScore
31.20
自引率
5.00%
发文量
469
审稿时长
1 months
期刊介绍:
ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format.
ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology.
The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.