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2 results on '"Shoudong XU"'

1. Surface modification of Na0.44MnO2 via a nonaqueous solution-assisted coating for ultra-Stable and High-Rate sodium-ion batteries

Author

Zhuangzhuang Zhao, Xiaobao Huang, Yifeng Shao, Shoudong Xu, Liang Chen, Lijuan Shi, Qun Yi, Chenjing Shang, and Ding Zhang

Subjects
Sodium-ion batteries, Cathode material, Surface modification, AlPO4 coating, Chemical engineering, TP155-156
Abstract

ABSTRACT: Sodium-ion batteries (SIBs) provide an attractive option for large-scale electrochemical energy storage applications. However, the approach to realize highly reversible cathode materials needs further exploration. Our work adopts a universal nonaqueous solution process in coating functional Al-PO4 layer on cathode material Na0.44MnO2 (NMO) for SIBs. Surface modification of NMO by AlPO4 coating layer facilitates the interfacial charge transfer reactions and enhances pseudocapacitance's contribution. The optimized 0.5 wt% AlPO4-coated Na0.44MnO2 (0.5 wt% AP-NMO) exhibits an enhanced capacity retention ratio of 80.3% after 500 cycles at 5 C (1 C=120 mA g−1) and a higher discharge capacity of 92 mAh g−1 at 10 C (1200 mA g−1). In addition, it can release a reversible capacity of 42 mAh g−1 at an ultra-high current density of 50 C (6000 mA g−1) and maintain 76% of the initial capacity after 2000 cycles. The coated materials also show extraordinary electrochemical stability at 60 °C. This research paves a way to apply an effective surface modification technique for enhancing transition metal oxide cathodes for SIBs.

Published
2022
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2. One-step synthesis of hollow structured Si/C composites based on expandable microspheres as anodes for lithium ion batteries

Author

Lingli Xie, Bo Chang, Wei Liang, Yae Li, Taotao Li, Ding Zhang, Shoudong Xu, and Litao Kang

Subjects
chemistry.chemical_classification, Materials science, Carbonization, chemistry.chemical_element, Nanoparticle, 02 engineering and technology, Polymer, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Lithium-ion battery, Expandable microsphere, 0104 chemical sciences, lcsh:Chemistry, chemistry.chemical_compound, chemistry, lcsh:Industrial electrochemistry, lcsh:QD1-999, Electrochemistry, Lithium, Composite material, 0210 nano-technology, Pyrolysis, Carbon, lcsh:TP250-261
Abstract

Si/C composites of carbon hollow structures loaded with Si nanoparticles (NPs) (Si/C-HSs) were prepared by one-step pyrolysis of a mixture of Si NPs and expandable microspheres (EMs). For the Si/C-HSs, hollow carbon shells with rough surfaces were formed by directly carbonizing the polymer shells of EMs, and the Si NPs fell into the void space or were loaded on the rough surfaces of the carbon shells. The EM-based carbon shells accommodated the volume expansion of the Si NPs and improved the electrical conductivity of the composites. As a result, the Si/C-HSs exhibited a high capacity (initial reversible capacity: 854.4 mAh g−1 at 300 mA g−1), stable cycling performance (capacity retention: 80% after 50 cycles), and excellent rate capability. Keywords: Expandable microsphere, Si/C composite, Hollow structure, Anode, Lithium ion battery

Published
2016

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