表面活性剂介导和形态控制的纳米结构 LiFePO4/碳复合材料作为锂离子电池的有前景的正极材料。,ChemistryOpen

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表面活性剂介导和形态控制的纳米结构 LiFePO4/碳复合材料作为锂离子电池的有前景的正极材料。
ChemistryOpen ( IF 2.5 ) Pub Date : 2019-09-27 , DOI: 10.1002/open.201900175
Sourav Khan ₁ , Rayappan Pavul Raj ₁ , Laurel George ₂ , G S Kamali Kannangara ₂ , Adriyan Milev ₂ , Upadhyayula V Varadaraju ₃ , Parasuraman Selvam _{1,

4,

5}

Affiliation

报道了使用嵌段共聚物通过表面活性剂辅助水热法合成形态控制的碳包覆纳米结构LiFePO _{4 (LFP/碳)正极材料。}所得纳米晶高表面积材料涂有碳，并命名为 LFP/C123 和 LFP/C311。所有材料均通过各种分析、光谱和成像技术进行系统表征。与 Pluronic® P123 (PEO-PPO-PEO) 相比，表面活性剂 Pluronic® 31R1 (PPO-PEO-PPO) 的反向结构在控制颗粒尺寸和形态方面发挥了至关重要的作用，从而改善了电化学性能：可逆比容量（LFP/C311和LFP/C123在0.1 C下分别为163 mAh g ^-1和140 mAh g ^{-1 ）。}此外，LFP/C311表现出优异的电化学性能，包括较低的电荷转移电阻（146.3 Ω）和优异的循环稳定性（100次循环后在1 C下容量保持率为95%）和高倍率性能（0.1 C下为163.2 mAh g ^-1；147.1 mAh g ^-1 (1 C)。前者更好的性能归因于具有特定纺锤形形态的 LFP 纳米颗粒（<50 nm）。此外，我们还评估了电极制造中使用的 PVDF 和 CMC 粘合剂的电极性能。

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Surfactant-Mediated and Morphology-Controlled Nanostructured LiFePO4/Carbon Composite as a Promising Cathode Material for Li-Ion Batteries.

The synthesis of morphology‐controlled carbon‐coated nanostructured LiFePO₄ (LFP/Carbon) cathode materials by surfactant‐assisted hydrothermal method using block copolymers is reported. The resulting nanocrystalline high surface area materials were coated with carbon and designated as LFP/C123 and LFP/C311. All the materials were systematically characterized by various analytical, spectroscopic and imaging techniques. The reverse structure of the surfactant Pluronic® 31R1 (PPO‐PEO‐PPO) in comparison to Pluronic® P123 (PEO‐PPO‐PEO) played a vital role in controlling the particle size and morphology which in turn ameliorate the electrochemical performance in terms of reversible specific capacity (163 mAh g⁻¹ and 140 mAh g⁻¹ at 0.1 C for LFP/C311 and LFP/C123, respectively). In addition, LFP/C311 demonstrated excellent electrochemical performance including lower charge transfer resistance (146.3 Ω) and excellent cycling stability (95 % capacity retention at 1 C after 100 cycles) and high rate capability (163.2 mAh g⁻¹ at 0.1 C; 147.1 mAh g⁻¹ at 1 C). The better performance of the former is attributed to LFP nanoparticles (<50 nm) with a specific spindle‐shaped morphology. Further, we have also evaluated the electrode performance with the use of both PVDF and CMC binders employed for the electrode fabrication.

更新日期：2019-09-27

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