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Xu X, Qiu Y, Len Z, Chen Z, Zhu W, Zhao W, Dai Y, Cao L, Geng H. Ultrahigh initial coulombic efficiency for deep sodium storage enabled by carbon-free vanadium-doping MoS 2 hierarchical nanostructure. J Colloid Interface Sci 2023; 656:252-261. [PMID: 37992531 DOI: 10.1016/j.jcis.2023.11.107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 11/11/2023] [Accepted: 11/17/2023] [Indexed: 11/24/2023]
Abstract
Molybdenum disulfide (MoS2) has garnered attention as a promising anode material for sodium-ion batteries due to its high theoretical capacity and unique lamellar texture. Nevertheless, unmodified MoS2 suffers from inferior electrical conductivity, poor reaction reversibility, and suboptimal cycle life upon repeated sodiation/desodiation. In this study, a novel carbon-free V-heteroatom doping MoS2 composite (abbr. VMS) with hierarchical laurustinus-like structure was synthesized by a facile one-step hydrothermal process. Specifically, the rational doping of V-atoms can effectively modulate the intrinsic electronic structure of pure MoS2, resulting in enhanced Na-ion diffusion rate, improved reaction kinetics and reduced activation energy compared to bare MoS2. Additionally, the hierarchical structure of the VMS composite, with sufficient spacing, effectively mitigates mechanical stress and ensures the integrity of active materials. Consequently, the prepared VMS composite possesses exceptional reaction reversibility (average ICE value of 92 %) and remarkable capacity retention (92.1 % after 450 cycles at 10 A/g). These findings contribute valuable insights into the development of advanced MoS2-based anode for sodium ion batteries.
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Affiliation(s)
- Xin Xu
- School of Materials Engineering, Changshu Institute of Technology, Changshu, Jiangsu 215500, PR China
| | - Yawen Qiu
- School of Materials Engineering, Changshu Institute of Technology, Changshu, Jiangsu 215500, PR China
| | - Zichen Len
- School of Materials Engineering, Changshu Institute of Technology, Changshu, Jiangsu 215500, PR China
| | - Zongquan Chen
- School of Materials Engineering, Changshu Institute of Technology, Changshu, Jiangsu 215500, PR China
| | - Wenxuan Zhu
- School of Materials Engineering, Changshu Institute of Technology, Changshu, Jiangsu 215500, PR China
| | - Wenqing Zhao
- School of Materials Engineering, Changshu Institute of Technology, Changshu, Jiangsu 215500, PR China
| | - Yue Dai
- School of Materials Engineering, Changshu Institute of Technology, Changshu, Jiangsu 215500, PR China
| | - Liang Cao
- School of Materials Engineering, Changshu Institute of Technology, Changshu, Jiangsu 215500, PR China; Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, PR China.
| | - Hongbo Geng
- School of Materials Engineering, Changshu Institute of Technology, Changshu, Jiangsu 215500, PR China
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Zhou J, Liu J, Li Y, Zhao Z, Zhou P, Wu X, Tang X, Zhou J. Reaching the initial coulombic efficiency and structural stability limit of P2/O3 biphasic layered cathode for sodium-ion batteries. J Colloid Interface Sci 2023; 638:758-767. [PMID: 36780854 DOI: 10.1016/j.jcis.2023.02.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 01/27/2023] [Accepted: 02/01/2023] [Indexed: 02/05/2023]
Abstract
The P2/O3 biphasic layered oxide (NaxMn1-yMyO2, M: doping elements) is a cathode family with great promise for sodium-ion batteries (SIBs) because of their tunable electrochemical performance and low cost. However, the ultrahigh initial coulombic efficiency (ICE) and inferior cycling performance of P2/O3-NaxMn1-yMyO2 need to be improved for practical application. Herein, Ni/Cu co-doped P2/O3-Na0.75Mn1-yNiy-zCuzO2 materials are well-designed. The ultrahigh ICE can be restrained by altering the ratio of P2/O3 via adjusting Ni content, and the structural stability can be improved by Cu doping via enlarging parameter c of O3 phase and suppressing irreversible P2-O2 phase transformation. The optimal P2/O3-Na0.75Mn0.6Ni0.3Cu0.1O2 delivers a capacity of 142.4 with ICE of 107.8%, superior capacity retention in the temperature range of -40 ∼ 30 °C, and rate performance of 95.9 mAh g-1 at 1.2 A g-1. The overall storage mechanism of P2/O3-Na0.75Mn0.6Ni0.3Cu0.1O2 is revealed by the combination of electrochemical profiles, in situ X-ray diffraction, and first-principles calculations. The Na-ion full battery based on P2/O3-Na0.75Mn0.6Ni0.3Cu0.1O2 cathode can achieve a remarkable energy density of 306.9 Wh kg-1 with a power density of 695.5 W kg-1 at 200 mA g-1. This work may shed light on the rational design of high-performance P2/O3 biphasic layered cathode for SIBs.
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Affiliation(s)
- Jingkai Zhou
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, PR China
| | - Jing Liu
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, PR China
| | - Yanyan Li
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, PR China
| | - Zhongjun Zhao
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, PR China
| | - Pengfei Zhou
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, PR China
| | - Xiaozhong Wu
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, PR China
| | - Xiaonan Tang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, PR China
| | - Jin Zhou
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, PR China.
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