Constructing double buffer layers to boost electrochemical performances of NCA cathode for ASSLB
Constructing double buffer layers to boost electrochemical performances of NCA cathode for ASSLB
复制标题
构建双缓冲层以提高ASSLB NCA阴极的电化学性能
DOI：
10.1016/j.ensm.2018.10.003
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发表时间：
2019-03
影响因子：
20.4
通讯作者：
张联齐
中科院分区：
文献类型：
--
作者：
李学磊;梁鸣;盛建;宋大卫;张洪周;时喜喜;张联齐
LiNi0.8Co0.15Al0.05O2（NCA）由于具有较高的比容量，被认为在使用硫化物电解质的全固态锂电池（ASSLB）中具有很好的应用前景。然而，NCA阴极与硫化物电解质之间的界面不稳定性仍然是一个严重的问题，导致NCA阴极的倍率和循环性能较差。为了提高NCA阴极的界面不稳定性，提高阴极的速率和循环性能，本文构造了一种新的双缓冲层策略。首先，将NCA设计为核壳结构，实现自涂覆，其中富ni芯lini0.85 co0.15 o2可以提供高容量，富al壳lini0.6 co0.15 al0.25 o2作为第一缓冲层可以在富ni芯上提供完整的涂覆。其次，在核壳NCA （CS-NCA）粒子表面涂覆薄的非活性linbo3层作为第二缓冲层，以增加界面稳定性。正如所料,LiNbO3-coated CS-NCA (CS-NCA@LiNbO3)阴极放电容量显示高(184.1 mAh g−1 0.06 C),优秀的首次库仑效率(90.2%,0.06 C),突出速度性能(130 mAh g−1 4.2 C)和循环性能(容量保留89.4%后400次0.3 C) 60 °C。结果表明，这种新型的双缓冲层策略可以有效地提高硫化物电解质ASSLB的NCA阴极的倍率和循环性能。
By virtue of high specific capacity, LiNi0.8Co0.15Al0.05O2(NCA) is considered to have a promising application in all-solid-state lithium batteries (ASSLB) using sulfide electrolyte. However, the interfacial instability between NCA cathode and sulfide electrolyte is still a serious problem, leading to poor rate and cycle performances of NCA cathode. To boost the interfacial instability and boost the rate and cycle performances of NCA cathode, a novel double buffer layer strategy is constructed in this paper. Firstly, NCA is designed as a core-shell structure to achieve self-coating, in which Ni-rich core LiNi0.85Co0.15O2can provide high capacity, and Al-rich shell LiNi0.6Co0.15Al0.25O2as the first buffer layer can provide the complete coating on the Ni-rich core. Secondly, a thin inactive LiNbO3layer as the second buffer layer is coated on the core-shelled NCA (CS-NCA) particles to increase the interface stability. As expected, LiNbO3-coated CS-NCA (CS-NCA@LiNbO3) cathode displays high discharge capacity (184.1 mAh g−1at 0.06 C), excellent initial coulombic efficiency (90.2%, 0.06 C), outstanding rate performance (130 mAh g−1at 4.2 C) and cycle performance (capacity retention of 89.4% after 400 cycles at 0.3 C) at 60 °C. The results indicate that this novel double buffer layers strategy is effective to boost rate and cycle performances of NCA cathode for ASSLB using sulfide electrolyte.
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