Dendrite-Free and Micron-Columnar Li Metal Deposited from LiNO3-Based Electrolytes,ACS Applied Energy Materials

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Dendrite-Free and Micron-Columnar Li Metal Deposited from LiNO3-Based Electrolytes
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-09-21 , DOI: 10.1021/acsaem.1c02158
Jingjing Zhou ₁ , Jiahang Chen ₂ , Jun Yang ₂ , Yanna Nuli ₂ , Jiulin Wang _{2,

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Affiliation

Rechargeable Li-metal anodes have received abundant attention for high-energy-density batteries. A solid electrolyte interphase (SEI) plays a significant role in regulating the Li⁺ deposition/stripping process. Aimed to solve detrimental Li deposition with a dendritic and mossy morphology, herein, dendrite-free columnar Li deposition in micron size is constructed via creatively adopting a LiNO₃-based electrolyte even at a high current density (2 mA cm^–2) and areal capacity (4 mAh cm^–2). N-rich inorganic SEI (Li₃N and LiN_xO_y) with superior Li⁺ conductivity is formed on Li deposition, which enables remarkable reversibility and high average Coulombic efficiency (CE) even over 240 cycles. A Li∥LiFePO₄ cell delivers excellent cycling stability over 700 cycles with a capacity fading rate of merely 0.022% per cycle. This work provides a way to regulating columnar Li deposition via N-rich SEI coordination and developing electrolyte formulations for secondary Li-metal batteries.

中文翻译：

从 LiNO3 基电解质沉积的无枝晶和微米柱状锂金属

可充电锂金属负极在高能量密度电池中受到广泛关注。固体电解质中间相 (SEI) 在调节 Li ⁺沉积/剥离过程中起着重要作用。旨在解决具有树枝状和苔藓状形态的有害锂沉积，在此，通过创造性地采用 LiNO ₃基电解质，即使在高电流密度（2 mA cm ^–2）和面积下也能构建微米尺寸的无树枝状柱状锂沉积。容量（4 mAh cm ^–2）。具有优异 Li ⁺的富氮无机 SEI（Li ₃ N 和 LiN _x O _y）在锂沉积时形成导电性，即使超过 240 次循环，也能实现显着的可逆性和高平均库仑效率 (CE)。Li∥LiFePO ₄电池在超过 700 次循环后具有出色的循环稳定性，每次循环的容量衰减率仅为 0.022%。这项工作提供了一种通过富含 N 的 SEI 配位调节柱状锂沉积和开发二次锂金属电池电解质配方的方法。

更新日期：2021-10-25

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