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Qiao Y, Liu Y, Zhu J, Jia P, Zhang L, Zhou W, Jiao T. Surfactant-Assisted Synthesis of Micro/Nano-Structured LiFePO 4 Electrode Materials with Improved Electrochemical Performance. MATERIALS (BASEL, SWITZERLAND) 2022; 15:8953. [PMID: 36556757 PMCID: PMC9782772 DOI: 10.3390/ma15248953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 12/08/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
As an electrode material, LiFePO4 has been extensively studied in the field of energy conversion and storage due to its inexpensive cost and excellent safety, as well as good cycling stability. However, it remains a challenge to obtain LiFePO4 electrode materials with acceptable discharge capacity at low temperature. Here, micro/nano-structured LiFePO4 electrode materials with grape-like morphology were fabricated via a facile solvothermal approach using ethanol and OA as the co-solvent, the surfactant as well as the carbon source. The structure and electrochemical properties of the LiFePO4 material were investigated with x-ray diffraction (XRD), field emission scanning electron microscopy (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), and the formation mechanism of the self-assembled micro/nano-structured LiFePO4 was discussed as well. The micro/nano-structured LiFePO4 electrode materials exhibited a high discharge capacity (142 mAh·g-1) at a low temperature of 0 °C, and retained 102 mAh·g-1 when the temperature was decreased to -20 °C. This investigation can provide a reference for the design of micro/nano-structured electrode materials with improvement of the electrochemical performance at low temperature.
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Affiliation(s)
- Yuqing Qiao
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
| | - Ying Liu
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
| | - Jianguo Zhu
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
| | - Peng Jia
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
| | - Liqiao Zhang
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
| | - Wei Zhou
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
| | - Tifeng Jiao
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
- State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
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Pi Y, Luo G, Wang P, Xu W, Yu J, Zhang X, Fu Z, Yang X, Wang L, Ding Y, Wang F. Material Optimization Engineering toward xLiFePO 4·yLi 3V 2(PO 4) 3 Composites in Application-Oriented Li-Ion Batteries. MATERIALS (BASEL, SWITZERLAND) 2022; 15:3668. [PMID: 35629697 PMCID: PMC9145807 DOI: 10.3390/ma15103668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 05/11/2022] [Accepted: 05/13/2022] [Indexed: 11/16/2022]
Abstract
The development of LiFePO4 (LFP) in high-power energy storage devices is hampered by its slow Li-ion diffusion kinetics. Constructing the composite electrode materials with vanadium substitution is a scientific endeavor to boost LFP's power capacity. Herein, a series of xLiFePO4·yLi3V2(PO4)3 (xLFP·yLVP) composites were fabricated using a simple spray-drying approach. We propose that 5LFP·LVP is the optimal choice for Li-ion battery promotion, owning to its excellent Li-ion storage capacity (material energy density of 413.6 W·h·kg-1), strong machining capability (compacted density of 1.82 g·cm-3) and lower raw material cost consumption. Furthermore, the 5LFP·LVP||LTO Li-ion pouch cell also presents prominent energy storage capability. After 300 cycles of a constant current test at 400 mA, 75% of the initial capacity (379.1 mA·h) is achieved, with around 100% of Coulombic efficiency. A capacity retention of 60.3% is displayed for the 300th cycle when discharging at 1200 mA, with the capacity fading by 0.15% per cycle. This prototype provides a valid and scientific attempt to accelerate the development of xLFP·yLVP composites in application-oriented Li-ion batteries.
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Affiliation(s)
- Yuqiang Pi
- School of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000, China; (Y.P.); (G.L.); (J.Y.); (X.Z.); (Z.F.); (X.Y.); (L.W.)
| | - Gangwei Luo
- School of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000, China; (Y.P.); (G.L.); (J.Y.); (X.Z.); (Z.F.); (X.Y.); (L.W.)
| | - Peiyao Wang
- Department of Mechanical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia;
| | - Wangwang Xu
- College of Materials and Chemical Engineering, China Three Gorges University, Yichang 443002, China;
| | - Jiage Yu
- School of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000, China; (Y.P.); (G.L.); (J.Y.); (X.Z.); (Z.F.); (X.Y.); (L.W.)
| | - Xian Zhang
- School of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000, China; (Y.P.); (G.L.); (J.Y.); (X.Z.); (Z.F.); (X.Y.); (L.W.)
| | - Zhengbing Fu
- School of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000, China; (Y.P.); (G.L.); (J.Y.); (X.Z.); (Z.F.); (X.Y.); (L.W.)
| | - Xiong Yang
- School of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000, China; (Y.P.); (G.L.); (J.Y.); (X.Z.); (Z.F.); (X.Y.); (L.W.)
| | - Li Wang
- School of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000, China; (Y.P.); (G.L.); (J.Y.); (X.Z.); (Z.F.); (X.Y.); (L.W.)
| | - Yu Ding
- School of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000, China; (Y.P.); (G.L.); (J.Y.); (X.Z.); (Z.F.); (X.Y.); (L.W.)
- Department of Mechanical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia;
- Qinghai Electronic Material Industry Development Co., Ltd., Xining 810006, China
| | - Feng Wang
- School of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000, China; (Y.P.); (G.L.); (J.Y.); (X.Z.); (Z.F.); (X.Y.); (L.W.)
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Liu D, Wang Y, Jia B, Wei J, Liu C, Zhu J, Tang S, Wu Z, Chen G. Microwave-Assisted Hydrothermal Preparation of Corn Straw Hydrochar as Supercapacitor Electrode Materials. ACS OMEGA 2020; 5:26084-26093. [PMID: 33073135 PMCID: PMC7557994 DOI: 10.1021/acsomega.0c03605] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 09/15/2020] [Indexed: 06/11/2023]
Abstract
In this work, we propose the microwave-assisted hydrothermal activation method to synthesize supercapacitor electrode materials from corn straw under a small amount of the potassium catalyst (30 wt %), which can meet the environmental protection and low-cost requirement. With the extension of radiation time from 40 to 100 min, the pore structure of hydrochar expands from the micropore to hierarchical pore, and the microstructure evolves from an amorphous structure to graphene-like sheets. Microwave-assisted hydrothermal activation can control the synergistic development of hierarchical pore and graphene-like sheets of hydrochar under the condition of using a lesser amount of the catalyst. The as-obtained HTC-40/70/100 shows an excellent graphitization degree and the developed hierarchical pores. By comparing the electrochemical performance of the symmetrical capacitor devices composed of corn straw hydrochar and pyrochar in organic electrolytes, we have found that the hydrochar is suitable for organic system symmetric capacitance, and the pore structure and graphitization degree are closely related to the transmission of ions and electrons in the electrolyte. Therefore, HTC-100 with a high specific surface area (1781 m2/g) and highly ordered microstructure has the best electrochemical performance.
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Affiliation(s)
- Dongdong Liu
- Key
Laboratory of Straw Biology and Utilization, The Ministry of Education, Jilin Agricultural University, Changchun 130118, China
- College
of Engineering and Technology, Jilin Agricultural
University, Changchun 130118, China
| | - Yiting Wang
- College
of Engineering and Technology, Jilin Agricultural
University, Changchun 130118, China
| | - Boyin Jia
- College
of Animal Science and Technology, Jilin
Agricultural University, Changchun 130118, China
| | - Jintao Wei
- College
of Engineering and Technology, Jilin Agricultural
University, Changchun 130118, China
| | - Chang Liu
- College
of Engineering and Technology, Jilin Agricultural
University, Changchun 130118, China
| | - Junhao Zhu
- College
of Engineering and Technology, Jilin Agricultural
University, Changchun 130118, China
| | - Shanshan Tang
- Key
Laboratory of Straw Biology and Utilization, The Ministry of Education, Jilin Agricultural University, Changchun 130118, China
| | - Zhihai Wu
- Faculty
of Agronomy, Jilin Agricultural University, Changchun 130118, China
| | - Guang Chen
- Key
Laboratory of Straw Biology and Utilization, The Ministry of Education, Jilin Agricultural University, Changchun 130118, China
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