Achieving a Stable Solid Electrolyte Interphase and Enhanced Thermal Stability by a Dual-Functional Electrolyte Additive toward a High-Loading LiNi0.8Mn0.1Co0.1O2 /Lithium Pouch Battery,ACS Applied Materials & Interfaces

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Achieving a Stable Solid Electrolyte Interphase and Enhanced Thermal Stability by a Dual-Functional Electrolyte Additive toward a High-Loading LiNi0.8Mn0.1Co0.1O2 /Lithium Pouch Battery
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-11-22 , DOI: 10.1021/acsami.1c17209
Hang Li ₁ , Zhipeng Wen ₁ , Dongzheng Wu ₁ , Weijie Ji ₁ , Zheng He ₂ , Feng Wang ₁ , Yang Yang ₃ , Peng Zhang ₂ , Jinbao Zhao ₁

Affiliation

Li metal batteries with high-capacity cathodes emerge as promising candidates for next-generation battery technologies. However, the poor reversibility of the Li deposition/stripping process severely reduces its lifespan, and safety also remains a major issue for the Li metal anodes. Herein, we propose (ethoxy)-penta-fluoro-cyclo-triphosphazene (DFA) as a dual-functional electrolyte additive to solve the engineering problem of balancing the cycle life and thermal stability of Li metal batteries. The NCM811/lithium metal pouch batteries (2900 mA h) are assembled using the commercial high areal capacity cathode (3.5 mA h cm^–2). Compared with the NCM811/Li batteries without DFA, the heat generation and heat generation power of lithium metal batteries with DFA are significantly reduced by half during charging. Moreover, the NCM811/Li pouch batteries with DFA show excellent stability in both hot-oven and adiabatic rate calorimeter experiments. Furthermore, a nonlinear phase field simulation is carried out for mechanism investigation, which confirms that the stable solid electrolyte interphase formed by DFA will improve the cycle life of the NCM811/Li pouch. The DFA is verified to be an effective additive to improve the cycle stability and safety simultaneously, providing new opportunities for developing high energy density Li metal batteries.

中文翻译：

通过双功能电解质添加剂实现稳定的固体电解质界面和增强的热稳定性，用于高负载 LiNi0.8Mn0.1Co0.1O2 /锂袋电池

具有高容量正极的锂金属电池成为下一代电池技术的有希望的候选者。然而，锂沉积/剥离过程的不良可逆性严重降低了其寿命，安全性也仍然是锂金属负极的主要问题。在此，我们提出（乙氧基）-五氟-环三磷腈（DFA）作为双功能电解质添加剂，以解决平衡锂金属电池循环寿命和热稳定性的工程问题。NCM811/锂金属软包电池 (2900 mAh) 使用商用高面积容量阴极 (3.5 mAh cm ^–2）。与不带DFA的NCM811/Li电池相比，带DFA的锂金属电池在充电时的发热和发热功率显着降低了一半。此外，带有 DFA 的 NCM811/Li 软包电池在热炉和绝热速率热量计实验中均表现出优异的稳定性。此外，进行了非线性相场模拟以进行机理研究，证实了由 DFA 形成的稳定的固体电解质中间相将提高 NCM811/Li 袋的循环寿命。DFA被证实是一种有效的添加剂，可以同时提高循环稳定性和安全性，为开发高能量密度锂金属电池提供了新的机会。

更新日期：2021-12-08

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