分离器(采油)
材料科学
电解质
阴极
离子
钠
电压
化学工程
电极
化学
电气工程
工程类
热力学
物理
有机化学
物理化学
冶金
作者
Y. Mao,Changjun Zhou,Haochen Gong,Shaojie Zhang,Xiaoyi Wang,Xinyi Liu,Qianxin Xiang,Jie Sun
出处
期刊:Small
[Wiley]
日期:2023-07-25
卷期号:19 (46)
被引量:1
标识
DOI:10.1002/smll.202303259
摘要
Sodium-ion batteries (SIBs) are expected to replace partial reliance on lithium-ion batteries (LIBs) in the field of large-scale energy storage as well as low-speed electric vehicles due to the abundance, wide distribution, and easy availability of sodium metal. Unfortunately, a certain amount of sodium ions are irreversibly trapped in the solid electrolyte interface (SEI) layer during the initial charging process, causing the initial capacity loss (ICL) of the SIBs. A separator capacity-compensation strategy is proposed, where the capacity compensator on the separator oxidizes below the high cut-off voltage of the cathode to provide additional sodium ions. This strategy shows attractive advantages, including adaptability to current production processes, no impairment of cell long-cycle life, controlled pre-sodiation degree, and strategy universality. The separator capacity-compensation strategy is applied in the NaNi1/3 Fe1/3 Mn1/3 O2 (NMFO)||HC full cell and achieve a compensated capacity ratio of 18.2%. In the Na3 V2 (PO4 )3 (NVP)||HC full cell, the initial reversible specific capacity is increased from 61.0 mAh g-1 to 83.1 mAh g-1 . The separator capacity-compensation strategy is proven to be universal and provides a new perspective to enhance the energy density of SIBs.
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