A Superior Carbonate Electrolyte for Stable Cycling Li Metal Batteries Using High Ni Cathode,ACS Energy Letters

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A Superior Carbonate Electrolyte for Stable Cycling Li Metal Batteries Using High Ni Cathode
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-06-09 , DOI: 10.1021/acsenergylett.2c01090
Guo-Xing Li ₁ , Heng Jiang ₁ , Rong Kou ₁ , Daiwei Wang ₁ , Au Nguyen ₂ , Meng Liao ₁ , Pei Shi ₃ , Alexander Silver ₂ , Donghai Wang ₁

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Li metal batteries pairing Li metal anode with high-nickel layer structured oxide cathode are a promising energy storage technology to achieve high energy density. To obtain long cycling life for Li metal batteries, the electrolyte plays a pivotal role in stabilizing both the Li metal anode and the high-nickel cathode upon electrochemical cycling. Herein, we report a carbonate electrolyte that enables a Li∥LiNi_0.8Mn_0.1Co_0.1O₂ pouch cell to achieve a high gravimetric energy density of 366 Wh/kg and unprecedented cycling stability with 80% capacity retention after 335 cycles. The ¹⁹F quantitative nuclear magnetic resonance spectroscopy and interface characterization demonstrate that FEC and LiDFOB can reduce the consumption rate of each other and the electrolyte, form a robust LiF-rich SEI on Li metal anode, and improve the microstructure integrity of the high-nickel cathode.

中文翻译：

一种用于使用高镍阴极稳定循环锂金属电池的优质碳酸盐电解质

将锂金属负极与高镍层结构氧化物正极配对的锂金属电池是一种很有前途的储能技术，可实现高能量密度。为了使锂金属电池获得较长的循环寿命，电解质在电化学循环中稳定锂金属负极和高镍正极方面发挥着关键作用。在此，我们报告了一种碳酸盐电解质，它使 Li∥LiNi _0.8 Mn _0.1 Co _0.1 O ₂软包电池能够实现 366 Wh/kg 的高重量能量密度和前所未有的循环稳定性，在 335 次循环后容量保持率为 80%。¹⁹ _F定量核磁共振光谱和界面表征表明，FEC和LiDFOB可以降低彼此和电解质的消耗率，在锂金属负极上形成坚固的富LiF SEI，提高高镍正极的微观结构完整性。

更新日期：2022-06-09

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