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首页> 外文期刊>ACS applied materials & interfaces >Understanding and Suppressing the Destructive Cobalt(II) Species in Graphite Interphase
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Understanding and Suppressing the Destructive Cobalt(II) Species in Graphite Interphase

机译：理解和抑制石墨间的破坏性钴（II）物种

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摘要

Co2+ species dissolved from LiCoO2 in lithiumion batteries have been well-established to be responsible for the cell performance fading, especially when the cells are charged to high voltage or at elevated temperatures. The accepted underlying mechanism is the deposition of Co2+ on the graphite anode that destroys the interphase. In this work, we report that the dissolved Co2+ exists in the form of both Co-0 and Co2+ on the graphite anode surface, while Co-0 formed at lithium insertion potential can be reoxidized to Co2+ during charging. Moreover, Co-0 shows a higher catalytic activity than Co2+ toward the reductive decomposition of carbonate electrolyte. An interphase of similar to 4 nm was thus engineered from a film-forming additive 3-sulflone, which completely eliminates the destructive effect of the deposited Co species. The understanding of the destructive role of the dissolved Co2+ on the interphasial stability of the graphite electrode and an effective strategy to suppress such a failure mechanism provides fresh insight into the failure mechanism of manganese-based cathode chemistries, which serves as a better guideline for electrolyte design for future batteries.
机译：已经很好地建立了溶于LiCoO2的CO2 +物种，以负责电池性能衰落，特别是当细胞充电到高电压或升高的温度时。所接受的潜在机制是CO2 +在石墨阳极上沉积，该阳极破坏了相互作用。在这项工作中，我们报告说，在石墨阳极表面上的CO-0和CO2 +的形式存在溶解的CO 2，而在充电期间，在锂插入电位上形成的CO-0可以在CO 2 +中进行再生成CO 2 +。此外，CO-0显示出比CO2 +更高的催化活性朝向碳酸盐电解质的还原分解。因此，从成膜添加剂3-巯葡葡聚石（完全消除沉积CO物种的破坏性效果）改造了与4nm相似的相互作用。理解溶解的CO2 +对石墨电极的间稳定性的破坏性作用以及抑制这种破坏机制的有效策略为锰基阴极化学物质的失效机制提供了新的洞察力，这是电解质的更好指南设计为未来的电池。

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  • 来源
    《ACS applied materials & interfaces》 |2019年第34期|共9页
  • 作者

    Wang Kang; Xing Lidan; Xu Kang; Zhou Hebing; Li Weishan;

  • 作者单位

    South China Normal Univ Minist Educ Key Lab ETESPG GHEI Engn Lab OFMHEB Guangdong Pro Res Ctr BMET Guangdong Prov Engn Res Ctr MTEES Guangzhou 510006 Guangdong Peoples R China;

    South China Normal Univ Minist Educ Key Lab ETESPG GHEI Engn Lab OFMHEB Guangdong Pro Res Ctr BMET Guangdong Prov Engn Res Ctr MTEES Guangzhou 510006 Guangdong Peoples R China;

    US Army Res Lab Power &

    Energy Div Electrochem Branch Sensor &

    Electron Devices Dire Adelphi MD 20783 USA;

    South China Normal Univ Minist Educ Key Lab ETESPG GHEI Engn Lab OFMHEB Guangdong Pro Res Ctr BMET Guangdong Prov Engn Res Ctr MTEES Guangzhou 510006 Guangdong Peoples R China;

    South China Normal Univ Minist Educ Key Lab ETESPG GHEI Engn Lab OFMHEB Guangdong Pro Res Ctr BMET Guangdong Prov Engn Res Ctr MTEES Guangzhou 510006 Guangdong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学工业;
  • 关键词

    lithium-ion battery; cobalt(II) ions; graphite electrode; film forming electrolyte additive; 3-sulflone;

    机译：锂离子电池;钴（II）离子;石墨电极;成膜电解质添加剂;3-巯基;

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