Stable Lithium Storage at Subzero Temperatures for High‐capacity Co3O4@graphene Composite Anodes,ChemNanoMat

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Stable Lithium Storage at Subzero Temperatures for High‐capacity Co3O4@graphene Composite Anodes
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-10-30 , DOI: 10.1002/cnma.202000547
Liang Tan ₁ , Xuexia Lan ₁ , Renzong Hu ₁ , Jun Liu ₁ , Bin Yuan ₁ , Min Zhu ₁

Affiliation

Achieving high energy density and long‐term stability at subzero temperatures remains one of the main challenges for the development of lithium‐ion batteries. Shortcomings in energy density and stability mainly highlight on the increase in internal resistance and electrode polarization at subzero temperatures, which greatly affect the reversible capacities of lithium‐ion batteries. In this work, a conversion type Co₃O₄@graphene (Co₃O₄@G) composite is prepared via a simple hydrothermal method and first evaluated at subzero temperatures. Benefitting from the especially suitable lithiation/delithiation potentials of Co₃O₄, ingenious nanostructure and high conductivity of graphene, the Co₃O₄@G anode exhibits much higher capacity retentions than intercalation‐ and alloying‐type anodes at subzero temperatures, with 58.4% of room‐temperature capacity retention at −30 °C for initial cycle and a highly stable reversible capacity of 605.0 mAh g⁻¹ (0.5 A g⁻¹) for 600 cycles at −10 °C. Furthermore, very high capacities of ∼920.4 mAh g⁻¹ (0.2 A g⁻¹) can be maintained at 30 °C, and ∼450.2 mAh g⁻¹ (0.5 A g⁻¹) can be remained at −20 °C during alternating cycling. This work demonstrates that conversion‐type Co₃O₄@G composites have superior extreme temperature lithium storage capabilities and can be viable Li‐ion anode materials with fast and highly efficient ion/electron transport capacity at subzero operating temperatures.

中文翻译：

高容量Co3O4 @石墨烯复合阳极在零以下温度下稳定的锂存储

在零以下温度下实现高能量密度和长期稳定性仍然是锂离子电池开发的主要挑战之一。能量密度和稳定性的缺点主要突出于零以下温度下内部电阻和电极极化的增加，这极大地影响了锂离子电池的可逆容量。在这项工作中，通过简单的水热法制备了转化型Co ₃ O ₄石墨烯（Co ₃ O ₄ @G）复合材料，并首先在零以下温度下进行了评估。受益于特别合适的Co ₃ O _4的锂化/去锂化潜力，巧妙的纳米结构和石墨烯的高电导率，在零以下温度下，Co ₃ O ₄ @G阳极比插层和合金型阳极具有更高的容量保持率，初始时在−30°C的室温下容量保持率为58.4％循环和在-10°C下600个循环的605.0 mAh g ^-1（0.5 A g ^-1）的高度稳定的可逆容量。此外，在30°C时，可以保持约920.4 mAh g ^-1（0.2 A g ^-1）的极高容量，而在-20°C时，可以在〜20°C保持约450.2 mAh g ^-1（0.5 A g ^-1）的容量。交替循环。这项工作证明了转化型Co ₃ O ₄@G复合材料具有出色的极限温度锂存储能力，并且可以成为可行的锂离子阳极材料，在低于零的工作温度下具有快速，高效的离子/电子传输能力。

更新日期：2020-10-30

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