{"title":"用更高的上限截止电压形成循环协议减少高镍阴极的初始容量损失","authors":"Zezhou Guo, Zehao Cui and Arumugam Manthiram*, ","doi":"10.1021/acsenergylett.4c01027","DOIUrl":null,"url":null,"abstract":"<p >LiNiO<sub>2</sub>-based layered oxides are regarded as promising cathode candidates for high-energy-density lithium-ion batteries. However, the large initial capacity loss (ICL) and severe electrode–electrolyte interfacial reactions significantly compromise the discharge capacity and cycle life of high-Ni cathodes. Here, we present a systemic investigation of the ICL in high-Ni cathodes by controlling the upper cutoff voltage (UCV) and dopants. It is demonstrated that the elevated ICL due to an incomplete M–H1 phase transition during discharge can be reduced via an activation step to H2–H3 phase transition at high voltages. It is shown that performing formation cycles of LiNiO<sub>2</sub> cells with a high UCV of 4.4 V offers significantly improved discharge capacity with minimal capacity retention penalty on cycling under a low UCV of 4.1 V. Furthermore, it is found that doping with Co reduces ICL, while other dopants, such as Mn, Al, and Mg, lead to an increase in ICL.</p>","PeriodicalId":16,"journal":{"name":"ACS Energy Letters ","volume":null,"pages":null},"PeriodicalIF":19.3000,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Reducing the Initial Capacity Loss in High-Nickel Cathodes with a Higher Upper Cut-off Voltage Formation Cycle Protocol\",\"authors\":\"Zezhou Guo, Zehao Cui and Arumugam Manthiram*, \",\"doi\":\"10.1021/acsenergylett.4c01027\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >LiNiO<sub>2</sub>-based layered oxides are regarded as promising cathode candidates for high-energy-density lithium-ion batteries. However, the large initial capacity loss (ICL) and severe electrode–electrolyte interfacial reactions significantly compromise the discharge capacity and cycle life of high-Ni cathodes. Here, we present a systemic investigation of the ICL in high-Ni cathodes by controlling the upper cutoff voltage (UCV) and dopants. It is demonstrated that the elevated ICL due to an incomplete M–H1 phase transition during discharge can be reduced via an activation step to H2–H3 phase transition at high voltages. It is shown that performing formation cycles of LiNiO<sub>2</sub> cells with a high UCV of 4.4 V offers significantly improved discharge capacity with minimal capacity retention penalty on cycling under a low UCV of 4.1 V. Furthermore, it is found that doping with Co reduces ICL, while other dopants, such as Mn, Al, and Mg, lead to an increase in ICL.</p>\",\"PeriodicalId\":16,\"journal\":{\"name\":\"ACS Energy Letters \",\"volume\":null,\"pages\":null},\"PeriodicalIF\":19.3000,\"publicationDate\":\"2024-06-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ACS Energy Letters \",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acsenergylett.4c01027\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Energy Letters ","FirstCategoryId":"88","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsenergylett.4c01027","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
摘要
基于 LiNiO2 的层状氧化物被认为是高能量密度锂离子电池的理想正极候选材料。然而,较大的初始容量损失(ICL)和严重的电极-电解质界面反应严重影响了高镍正极的放电容量和循环寿命。在此,我们通过控制上限截止电压(UCV)和掺杂剂,对高镍阴极中的 ICL 进行了系统研究。研究表明,由于放电过程中 M-H1 相变不完全而导致的 ICL 升高,可以通过激活步骤在高电压下降低到 H2-H3 相变。研究表明,在 4.4 V 的高 UCV 下进行二氧化钛电池的形成循环,可显著提高放电容量,而在 4.1 V 的低 UCV 下进行循环时,对容量保持的影响最小。此外,研究还发现,掺入 Co 会降低 ICL,而其他掺杂剂(如锰、铝和镁)则会提高 ICL。
Reducing the Initial Capacity Loss in High-Nickel Cathodes with a Higher Upper Cut-off Voltage Formation Cycle Protocol
LiNiO2-based layered oxides are regarded as promising cathode candidates for high-energy-density lithium-ion batteries. However, the large initial capacity loss (ICL) and severe electrode–electrolyte interfacial reactions significantly compromise the discharge capacity and cycle life of high-Ni cathodes. Here, we present a systemic investigation of the ICL in high-Ni cathodes by controlling the upper cutoff voltage (UCV) and dopants. It is demonstrated that the elevated ICL due to an incomplete M–H1 phase transition during discharge can be reduced via an activation step to H2–H3 phase transition at high voltages. It is shown that performing formation cycles of LiNiO2 cells with a high UCV of 4.4 V offers significantly improved discharge capacity with minimal capacity retention penalty on cycling under a low UCV of 4.1 V. Furthermore, it is found that doping with Co reduces ICL, while other dopants, such as Mn, Al, and Mg, lead to an increase in ICL.
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.