High-Energy-Density and Long-Lifetime Lithium-Ion Battery Enabled by a Stabilized Li2O2 Cathode Prelithiation Additive,ACS Applied Materials & Interfaces

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High-Energy-Density and Long-Lifetime Lithium-Ion Battery Enabled by a Stabilized Li2O2 Cathode Prelithiation Additive
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-08-22 , DOI: 10.1021/acsami.2c08788
Liyuan Zheng ₁ , Aishui Yu ₂ , Guang Li ₁ , Jingjing Zhang ₁

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Lithium-ion batteries (LIBs) typically suffer from large irreversible capacities caused by active lithium loss during formation of a solid electrolyte interface (SEI) at the anode side. Cathode prelithiation with preloaded additives has emerged as an effective strategy to solve the above issue. With ultrahigh theoretical capacity, Li₂O₂ serves as an excellent cathode prelithiation additive, whereas poor ambient stability limits its further development. In this study, we report a surface protection strategy to enable ambient processing of the Li₂O₂ additive. Li₂O₂ is well confined in poly(methyl methacrylate) (PMMA) nanofibers (P-Li₂O₂) via electrospinning, which exhibits greatly enhanced ambient stability compared with the unprotected one. Notably, when P-Li₂O₂ is preloaded in LiNi_0.5Co_0.2Mn_0.3O₂ cathodes (NCM-P-Li₂O₂), PMMA nanofibers remain stable during cathode slurry processing but readily dissolve in electrolytes and expose Li₂O₂ for effective electrochemical oxidation. Fabrication of P-Li₂O₂ allows systematic investigation of prelithiation behavior in full cells (NCM-P-Li₂O₂ cathodes paired with Si/Graphite anodes) and its impact on the electrochemical performance. Rational tuning of the prelithiation degree provides guidance for optimizing the amount of the cathode additive, which brings appealing cell lifetime and energy density.

中文翻译：

由稳定的 Li2O2 正极预锂化添加剂实现的高能量密度和长寿命锂离子电池

锂离子电池 (LIB) 通常会因在阳极侧形成固体电解质界面 (SEI) 过程中的活性锂损失而遭受较大的不可逆容量。预载添加剂的阴极预锂化已成为解决上述问题的有效策略。_{Li 2} O ₂具有超高的理论容量，可作为优良的正极预锂化添加剂，但环境稳定性差限制了其进一步发展。在这项研究中，我们报告了一种表面保护策略，以实现 Li ₂ O ₂添加剂的环境处理。Li ₂ O ₂很好地限制在聚（甲基丙烯酸甲酯）（PMMA）纳米纤维（P-Li ₂ O ₂）通过静电纺丝，与未受保护的相比，其环境稳定性大大提高。值得注意的是，当 P-Li ₂ O ₂预负载在 LiNi _0.5 Co _0.2 Mn _0.3 O ₂正极（NCM-P-Li ₂ O ₂）中时，PMMA纳米纤维在正极浆料处理过程中保持稳定，但容易溶解在电解质中并暴露出Li ₂ O ₂有效的电化学氧化。P-Li ₂ O ₂的制备允许系统研究全电池中的预锂化行为（NCM-P-Li ₂ O ₂阴极与硅/石墨阳极配对）及其对电化学性能的影响。预锂化程度的合理调整为优化正极添加剂的用量提供了指导，从而带来了有吸引力的电池寿命和能量密度。

更新日期：2022-08-22

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