Self-Stabilized LiNi0.8Mn0.1Co0.1O2 in thiophosphate-based all-solid-state batteries through extra LiOH
Self-Stabilized LiNi0.8Mn0.1Co0.1O2 in thiophosphate-based all-solid-state batteries through extra LiOH
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DOI：
10.1016/j.ensm.2021.06.024
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发表时间：
2021-10
影响因子：
20.4
通讯作者：
Yubin Zhang;Xiao Sun;D. Cao;G. Gao;Zhenzhen Yang;Hongli Zhu;Yan Wang
中科院分区：
文献类型：
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作者：
Yubin Zhang;Xiao Sun;D. Cao;G. Gao;Zhenzhen Yang;Hongli Zhu;Yan Wang
富镍LiNi0.8Co0.1Mn0.1O2(NMC 811)正极材料具有高能量密度和低成本的优异特性，使其在下一代高能全固态锂电池（ASSLB）方面具有巨大潜力。然而，NMC 811 与固态电解质 (SSE)，尤其是 Li6PS5Cl 等硫代磷酸盐电解质，存在严重的表面电化学、化学和电压不兼容性。尽管已经采用了多种涂层方法来克服这个问题，但它们通常既麻烦又昂贵。满足成本效益、稳定性、均匀性、可扩展性和易于实现的所有要求的涂层策略仍然具有挑战性。在这项工作中，我们开发了一种基于 LiOH 的表面稳定策略，可在 NMC 811 上提供约 10 nm 的稳定渗透层。将 NMC 811 前驱体与 LiOH 混合（通常用于 NMC 811 锂化工艺）进行一步烧结后，过量的 LiOH 同时分布在 NMC 811 颗粒上。与其他报道的方法不同，这种涂层方法可以轻松控制和制造，无需额外的复杂工艺。通过简单地控制 LiOH 层的厚度（保护 Li6PS5Cl 固体电解质材料不被氧化），可以在 2.50−4.20 V 的宽电化学窗口（相对于 Li-In）下获得 600 次循环的优化循环稳定性，平均容量为 130 mAhg−1。
Nickle-rich LiNi0.8Co0.1Mn0.1O2(NMC 811) cathode material exhibits engaging properties in high energy density and low cost, making it great potential for the next generation high-energy all-solid-state lithium batteries (ASSLBs). However, NMC 811 suffers from severe surface electrochemical, chemical, and voltage incompatibility towards solid-state electrolytes (SSE), especially thiophosphate-based electrolytes like Li6PS5Cl. Although diverse coating methods have been made to overcome this issue, they are typically cumbersome and expensive. A coating strategy that satisfied all the requirements of cost-efficiency, stability, uniformity, scalability, and easy-achieving is still challenging. In this work, we developed a LiOH-based surface stabilization strategy that provides a ~10 nm stable permeable layer on NMC 811. After one-step sintering of NMC 811 precursor mixed with LiOH, which is commonly used for NMC 811 lithiation process, excessive LiOH simultaneously distributes on NMC 811 particles. Unlike other reported methods, this coating method can be easily controlled and fabricated without additional complicated processes. By simply controlling the thickness of LiOH layer, which protects the Li6PS5Cl solid electrolyte materials from being oxidized, optimized cycling stability can be obtained for 600 cycles with capacity of 130 mAhg−1on average at a wide electrochemical window of 2.50−4.20 V (vs. Li-In).