{"title":"关于锂硫电池低速率活化必要性的研究","authors":"Chen Li, Su Wang, Zhaokun Wang, Zuohang Li, Chenchen Zhang, Yue Ma, Xixi Shi, Hongzhou Zhang, Dawei Song, Lianqi Zhang","doi":"10.1002/adfm.202414159","DOIUrl":null,"url":null,"abstract":"Low rate activation process is always used in conventional transition metal oxide cathode and fully activates active substances/electrolyte to achieve stable electrochemical performance. However, the related working mechanism in lithium-sulfur (Li- battery is unclear due to the multiple complex chemical reaction steps including the redox of sulfur and the dissolution of polysulfides intermediate. Hence, the influencing mechanism of activation process on Li-S battery is explored by adopting different current densities of 0.05, 0.2, and 1 C in initial three cycles before long-term cycling tests at 0.2 C (denoted by 0.05, 0.2, and 1-battery). 0.05-battery presents the highest initial capacity in activation process, while 0.2-battery presents superior electrochemical performances after 150 cycles. The similar trend can be found in more long-term cycling rates such as 0.02, 0.1, 0.5, and 1 C. Potentiostatically Li<sub>2</sub>S precipitation test demonstrates that rapid generation of Li<sub>2</sub>S is achieved at higher current density, and S<sub>8</sub>-Li<sub>2</sub>S<sub>n</sub>-Li<sub>2</sub>S conversion is accelerated according to Tafel plots. However, interfacial electrochemical and physical characterizations suggest that serious lithium dendrite growth will be induced under high current density. Therefore, considering the reaction kinetics and interfacial properties, low rate activation process is unnecessary when cycling current lower than 1 C for Li-S battery.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":null,"pages":null},"PeriodicalIF":18.5000,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Investigation on the Necessity of Low Rates Activation toward Lithium-Sulfur Batteries\",\"authors\":\"Chen Li, Su Wang, Zhaokun Wang, Zuohang Li, Chenchen Zhang, Yue Ma, Xixi Shi, Hongzhou Zhang, Dawei Song, Lianqi Zhang\",\"doi\":\"10.1002/adfm.202414159\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Low rate activation process is always used in conventional transition metal oxide cathode and fully activates active substances/electrolyte to achieve stable electrochemical performance. However, the related working mechanism in lithium-sulfur (Li- battery is unclear due to the multiple complex chemical reaction steps including the redox of sulfur and the dissolution of polysulfides intermediate. Hence, the influencing mechanism of activation process on Li-S battery is explored by adopting different current densities of 0.05, 0.2, and 1 C in initial three cycles before long-term cycling tests at 0.2 C (denoted by 0.05, 0.2, and 1-battery). 0.05-battery presents the highest initial capacity in activation process, while 0.2-battery presents superior electrochemical performances after 150 cycles. The similar trend can be found in more long-term cycling rates such as 0.02, 0.1, 0.5, and 1 C. Potentiostatically Li<sub>2</sub>S precipitation test demonstrates that rapid generation of Li<sub>2</sub>S is achieved at higher current density, and S<sub>8</sub>-Li<sub>2</sub>S<sub>n</sub>-Li<sub>2</sub>S conversion is accelerated according to Tafel plots. However, interfacial electrochemical and physical characterizations suggest that serious lithium dendrite growth will be induced under high current density. Therefore, considering the reaction kinetics and interfacial properties, low rate activation process is unnecessary when cycling current lower than 1 C for Li-S battery.\",\"PeriodicalId\":112,\"journal\":{\"name\":\"Advanced Functional Materials\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":18.5000,\"publicationDate\":\"2024-10-21\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Advanced Functional Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1002/adfm.202414159\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Functional Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1002/adfm.202414159","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
传统的过渡金属氧化物正极通常采用低速率活化工艺,充分活化活性物质/电解质,以实现稳定的电化学性能。然而,由于硫的氧化还原和多硫化物中间体的溶解等多个复杂的化学反应步骤,锂硫电池的相关工作机制尚不清楚。因此,在 0.2 C 条件下进行长期循环测试之前,通过在最初三次循环中采用 0.05、0.2 和 1 C 的不同电流密度,探索了活化过程对锂-硫电池的影响机制(以 0.05、0.2 和 1 电池表示)。在活化过程中,0.05 电池的初始容量最高,而 0.2 电池在 150 次循环后的电化学性能更优。恒电位析出 Li2S 测试表明,在较高的电流密度下,可快速生成 Li2S,而且根据塔菲尔图,S8-Li2Sn-Li2S 的转化速度加快。然而,界面电化学和物理特性表明,在高电流密度下会诱发严重的锂枝晶生长。因此,考虑到反应动力学和界面特性,当锂离子电池的循环电流低于 1 C 时,不需要低速率活化过程。
Investigation on the Necessity of Low Rates Activation toward Lithium-Sulfur Batteries
Low rate activation process is always used in conventional transition metal oxide cathode and fully activates active substances/electrolyte to achieve stable electrochemical performance. However, the related working mechanism in lithium-sulfur (Li- battery is unclear due to the multiple complex chemical reaction steps including the redox of sulfur and the dissolution of polysulfides intermediate. Hence, the influencing mechanism of activation process on Li-S battery is explored by adopting different current densities of 0.05, 0.2, and 1 C in initial three cycles before long-term cycling tests at 0.2 C (denoted by 0.05, 0.2, and 1-battery). 0.05-battery presents the highest initial capacity in activation process, while 0.2-battery presents superior electrochemical performances after 150 cycles. The similar trend can be found in more long-term cycling rates such as 0.02, 0.1, 0.5, and 1 C. Potentiostatically Li2S precipitation test demonstrates that rapid generation of Li2S is achieved at higher current density, and S8-Li2Sn-Li2S conversion is accelerated according to Tafel plots. However, interfacial electrochemical and physical characterizations suggest that serious lithium dendrite growth will be induced under high current density. Therefore, considering the reaction kinetics and interfacial properties, low rate activation process is unnecessary when cycling current lower than 1 C for Li-S battery.
期刊介绍:
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