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500 Wh kg-1 Class Li Metal Battery Enabled by a Self-Organized Core-Shell Composite Anode.
Advanced Materials ( IF 29.4 ) Pub Date : 2020-09-15 , DOI: 10.1002/adma.202004793
Bing Han 1, 2 , Dongwei Xu 1 , Shang-Sen Chi 1, 3 , Dongsheng He 1 , Zhen Zhang 1 , Leilei Du 1 , Meng Gu 1 , Chaoyang Wang 4 , Hong Meng 2 , Kang Xu 5 , Zijian Zheng 3 , Yonghong Deng 1
Affiliation  

Lithium (Li) metal offers the highest projected energy density as a battery anode, however its extremely high reactivity induces dendrite growth and dead Li formation during repeated charge/discharge processes, resulting in both poor reversibility and catastrophic failure. Approaches reported to date often seek to suppress dendrites formation at the expense of energy density. Here, a strategy that resolves the above conflict and achieves a dendrite‐free and long‐term reversible Li metal anode is reported. A self‐organized core–shell composite anode, comprising an outer sheath of lithiated liquid metal (LixLMy) and an inner layer of Li metal, is developed, which posesses high electrical and ionic conductivity, and physically separates Li from the electrolyte. The introduction of LixLMy not only prevents dendrite formation, but also eliminates the use of copper as an inert substrate. Full cells made of such composite anodes and commercially available LiNi0.6Co0.2Mn0.2O2 (NCM622) cathodes deliver ultrahigh energy density of 1500 Wh L−1 and 483 Wh kg−1. The high capacity can be maintained for more than 500 cycles, with fading rate of less than 0.05% per cycle. Pairing with LiNi0.8Co0.1Mn0.1O2 (NCM811) further raises the energy density to 1732 Wh L−1 and 514 Wh kg−1.

中文翻译:

通过自组织核壳复合阳极实现的500 Wh kg-1类锂金属电池。

锂(Li)金属作为电池阳极可提供最高的预计能量密度,但是其极高的反应活性会导致树枝状晶体的生长和重复充电/放电过程中死锂的形成,从而导致不良的可逆性和灾难性故障。迄今为止报道的方法经常试图以能量密度为代价抑制树枝状晶体的形成。在此,报告了解决上述冲突并实现无枝晶且长期可逆的锂金属阳极的策略。开发了一种自组织核壳复合阳极,该阳极包括锂化液态金属的外层护套(Li x LM y)和锂金属的内层,具有高的电导率和离子电导率,并且将Li与电解质物理隔离。李的介绍x LM y不仅防止枝晶形成,而且消除了使用铜作为惰性衬底的情况。由这种复合阳极和可商购的LiNi 0.6 Co 0.2 Mn 0.2 O 2(NCM 622)阴极制成的全电池可提供1500 Wh L -1和483 Wh kg -1的超高能量密度。高容量可以维持超过500个循环,而每个循环的衰落率小于0.05%。与LiNi 0.8 Co 0.1 Mn 0.1 O 2(NCM 811)配对后,能量密度进一步提高到1732 Wh L -1和514 Wh kg -1
更新日期:2020-10-20
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