Functionalized Boron Nitride Nanosheets/Graphene Interlayer for Fast and Long-Life Lithium-Sulfur Batteries
Functionalized Boron Nitride Nanosheets/Graphene Interlayer for Fast and Long-Life Lithium-Sulfur Batteries
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DOI：
10.1002/aenm.201602380
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发表时间：
2017-07-05
影响因子：
27.8
通讯作者：
Chen, Ying
中科院分区：
文献类型：
--
作者：
Fan, Ye;Yang, Zhi;Chen, Ying
锂硫（Li-S）电池具有比Li离子电池高得多的能量密度，因此被认为是用于电动车辆应用的下一代电池。然而，由于可溶性多硫化物在电极之间穿梭而导致的容量快速衰减的问题仍然是实际应用的主要障碍。在这里，已经设计和生产了薄的和选择性的夹层结构，以降低电荷转移电阻和减轻穿梭问题，简单地通过用官能化氮化硼纳米片/石墨烯的薄膜涂覆阴极的表面。由于这种薄且超轻的中间层，具有含硫多孔碳纳米管（约60wt%硫含量）阴极的Li-S电池的比容量和循环稳定性已经显著改善，寿命超过1000次循环，在3C下的初始比容量为1100 mA h g（-1），并且循环衰减低至0.0037%/循环。这种新的中间层提供了一种有前途的方法来显着提高锂硫电池的性能。
Lithium-sulfur (Li-S) batteries have a much higher energy density than Li ion batteries and thus are considered as next generation batteries for electric vehicle applications. However, the problem of rapid capacity fading due to the shuttling of soluble polysulfides between electrodes remains the main obstacle for practical applications. Here, a thin and selective interlayer structure has been designed and produced to decrease the charge transfer resistance and mitigate the shuttling problem, simply by coating the surface of cathode with a thin film of functionalized boron nitride nanosheets/graphene. Due to this thin and ultralight interlayer, the specific capacity and cycling stability of the Li-S batteries with a cathode of sulfur-containing porous carbon nanotubes (approximate to 60 wt% sulfur content) have been improved significantly with a life of over 1000 cycles, an initial specific capacity of 1100 mA h g(-1) at 3 C, and a cycle decay as low as 0.0037% per cycle. This new interlayer provides a promising approach to significantly enhance the performance of Li-S batteries.