阴极
羧甲基纤维素
电解质
碳纤维
材料科学
钠
涂层
化学工程
电化学
锂(药物)
电池(电)
复合材料
电极
化学
冶金
工程类
复合数
物理
内分泌学
医学
物理化学
功率(物理)
量子力学
作者
Kang Liang,Hongshun Zhao,Jianbin Li,Xiaobing Huang,Yurong Ren
标识
DOI:10.1016/j.apsusc.2023.156412
摘要
Sodium-ion batteries (SIBs) are encouraging substitute to lithium-ion batteries. However, the application of SIBs is limited by their sluggish kinetics and unstable cyclic stability. Here, a crosslinked carbon-covered porous Na3V2(PO4)2F3 (NVPF) composite was prepared via a carboxymethyl cellulose (CMC)-assisted sol–gel strategy. The influences of the CMC on the interface and electrochemical properties were investigated. CMC supplemented additional Na+ that compensated for the sodium loss during the generation of the solid electrolyte interface. Besides, the crosslinked carbon formed by CMC strengthened the structure. Meanwhile, the porous coating layer with a large pore provided a fast transfer path for Na+. Thus, the optimized NVPF@C@CMC delivered an outstanding discharge capacity of 125.8 mAh g-1 at 0.2C, superb rate capability of 70.4 mAh g-1 at 20C, and good high-temperature adaptability (122.8 mAh g-1 at 0.2C and 45 °C). Moreover, in the full battery composed of the NVPF@C@CMC and a hard carbon, a high discharge capacity of 123.3 mAh g-1 was acquired at 0.2C. These superior results can be attributed to the simultaneous realization of self-sodium compensation, interface modification, and crosslinked carbon coating. Therefore, the proposed modified sol–gel method is a multi-effect synergistic approach for the advance of high-performance energy-storage materials.
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