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通过碳点来增强聚离子阴极中的接口动力学和热力学,用于超快充的离子电池

Yujin Li¹, Yu Mei¹, Roya Momen²

¹State Key Laboratory of Powder Metallurgy, College of Chemistry and Chemical Engineering, Central South University Changsha 410083 China hs-hou@csu.edu.cn.

Chemical science

|December 22, 2023

概括

研究人员通过增强正极材料开发了一种用于超快充电池的新策略. 这种方法改善了离子扩散和稳定性,为下一代可充电电池的更快充电铺平了道路.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
储能储能储能储能储能储能

背景情况:

超快速充电对于下一代电池至关重要,但受到阴极材料特性 (如离子扩散,导电性和稳定性) 的限制.
当前的聚离子阴极材料在实现高充电率和长期结构完整性方面面临着挑战.

研究的目的:

提出一个协同战略,增强聚离子阴极材料的快充能力和结构稳定性.
研究用于提高电池性能的接口动力学和热力学.

主要方法:

开发了一种Na3V2(PO4) 3复合物 (NVP/NSC),使用N/S联合剂的碳点作为接口层.
运用密度函数理论 (DFT) 计算来分析Na+运输能源障碍.
利用D频段中心理论来评估对V-O键强度和相变阻断的影响.

主要成果:

这种V-N/S-C接口结合显著降低了Na+运输能源障碍.
在100°C下,NVP/NSC在10,000个周期 (87.2 mA hg-1,0.0028%衰变/周期) 中表现出异常的循环稳定性,碳含量低 (2.23%).
一个全细胞 (NVP/NSC‖HC) 在5C (115.3 mA hg-1,800个循环后92.1%的保留) 显示出出色的性能.

结论:

接口协同作用策略有效地提高了聚离子阴极材料的快充能力和结构稳定性.
这种方法为设计用于超快充应用的先进阴极材料提供了新的途径.
这些发现为未来开发高性能可充电电池提供了关键的见解.

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