电解质成分对 Na3(VOPO4)2F 阴极性能的影响：综合案例研究,ACS Applied Energy Materials

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电解质成分对 Na3(VOPO4)2F 阴极性能的影响：综合案例研究
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2023-09-05 , DOI: 10.1021/acsaem.3c01169
Mangali Madhu Krishna _{1,

2} , Ganapathiraju Jayasree _{1,

2} , Rashmi Reddy Mallu _{1,

2} , Pratyay Basak _{1,

2}

Affiliation

可充电电池的性能主要依赖于通过电极-电解质相互作用形成的固体电解质界面（CEI/SEI）。钠离子技术在这方面也不例外。因此，电池研究的一个主要焦点是确定最合适的电解质配方，以最大限度地减少不必要的界面反应，同时提高电池性能、多个循环的稳定性和安全性。钠离子电池 (NIB) 电解质的合适黄金标准尚未确定。这项研究表明我们努力寻找合适的无添加剂电解液成分，用于与氟磷酸钒钠 (Na ₃ (VO _{1– x} PO ₄ ) ₂ F _1+2配对x；0 ≤ x ≤ 1)，最有前途的NIB正极材料之一。制备了一系列电解质配方，并进行了综合的物理化学和电化学表征，确定了电解质中的离子溶剂化、比电导率和离子输运行为、主要离子种类、电化学稳定性等关键参数，事先测试其与使用合成 Na₃ (VOPO₄ )_{2制造的电极的性能}F（NVOPF）。详细研究了所有六种选定的电解质成分对比容量、可逆性、电荷保持性、稳定性和倍率能力的影响。通过生命周期结束分析，对电极-电解质对的性能比较评估、得出的关键推论、对 CEI/SEI 层的影响、NVOPF 电极针对每种电解质组合物的操作可行性和可循环性进行了合理化，该分析提供了关键信息在多个循环中保持电极结构完整性的见解。

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Impact of Electrolyte Composition on the Performance of Na3(VOPO4)2F Cathodes: A Comprehensive Case Study

The performance of rechargeable batteries relies primarily on the formation of a solid electrolyte interface (CEI/SEI) via electrode–electrolyte interactions. Na-ion technology is no exception in this regard. Hence, a major focus of battery research is to identify the most appropriate electrolyte formulation to minimize unwanted interfacial reactions while enhancing cell performance, stability over multiple cycles, and safety. A suitable gold standard for Na-ion battery (NIB) electrolytes is yet to be identified. This investigation presents our effort to identify appropriate electrolyte composition sans additives for pairing with sodium vanadium fluorophosphate (Na₃(VO_1–xPO₄)₂F_1+2x; 0 ≤ x ≤ 1), one of the most promising cathode materials for NIBs. A series of electrolyte formulations were prepared, and comprehensive physicochemical and electrochemical characterizations were carried out to determine the key parameters, i.e., the ion solvation in the electrolyte, specific conductivity and ion transport behavior, dominant ionic species, electrochemical stability, etc., prior to being tested for their performance against electrodes fabricated using synthesized Na₃(VOPO₄)₂F (NVOPF). The impact of all six select electrolyte compositions on the specific capacity, reversibility, charge retention, stability and C-rate capability were investigated in detail. The comparative appraisal of electrode–electrolyte pairs on performance, the key inferences drawn, influence on the CEI/SEI layer, operational feasibility and cyclability of the NVOPF electrodes against each electrolyte composition were rationalized with the end-of-life cycle analysis that provided key insights to preserve the structural integrity of electrodes over multiple cycles.

更新日期：2023-09-05

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