Shihao Duan, Shuoqing Zhang, Yong Li, Rui Guo*, Ling Lv, Ruhong Li, Zunchun Wu, Menglu Li, Shunrui Xiao, Lixin Chen, Yong Shi, Tao Deng and Xiulin Fan*,
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引用次数: 0
摘要
溶剂脱氢是高压锂离子电池(LIB)正负极电解质界面(CEI)上的一个重大挑战,会产生腐蚀性氢氟酸(HF),对 LIB 的可持续性造成不利影响。在此,我们提出了一种由氢转移介导的界面自增强策略,以缓解 CEI 中的溶剂脱氢。作为概念验证,磷酸三甲酯(TMP)与 1,1,2,2,3,3,4-七氟环戊烷(HFCP)结合制备高压电解质,其中 TMP 用于捕获 HFCP 脱氢产生的 H 自由基,而脱氢的 HFCP 自由基将原位钝化阴极/电解质界面。此外,TMP/HFCP 电解液在电化学和热测试中还表现出不易燃和产气少的良好特性。这项研究为实现高电压和高安全性的 LIB 提供了一条前景广阔的途径。
H-Transfer Mediated Self-Enhanced Interphase for High-Voltage Lithium-Ion Batteries
The dehydrogenation of solvents presents a significant challenge at the cathode–electrolyte interface (CEI) in high-voltage lithium-ion batteries (LIBs), resulting in the generation of corrosive HF and posing detrimental effects on the sustainability of LIBs. Herein, we propose an interfacial self-enhanced strategy mediated by H-transfer to mitigate solvent dehydrogenation at the CEI. As a proof of concept, trimethyl phosphate (TMP) was coupled with 1,1,2,2,3,3,4-heptafluorocyclopentane (HFCP) to prepare the high-voltage electrolyte, where TMP serves to capture H free radicals produced by the dehydrogenation of HFCP, while the dehydrogenated-HFCP radicals would in situ passivate the cathode/electrolyte interface. The TMP/HFCP electrolyte enables a 4.4 V graphite||LiNi0.8Co0.1Mn0.1O2 LIB to achieve over 90% capacity retention after 1300 cycles at 0.5 C. Furthermore, the TMP/HFCP electrolyte exhibits favorable properties in terms of nonflammability and minimal gas production during electrochemical and thermal tests. This work presents a promising pathway for realizing high-voltage and high-safety LIBs.
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.