Small
·
2018
·Vol. 14
·期 39
·1802694
·
IF 9.598
Haiyan Lu,Fangxing Ai,Yanlong Jia,Chunyan Tang,Xinhe Zhang,Yunhui Huang,Hanxi Yang,Yuliang Cao
Hard carbon is considered as one of the most promising anodes in sodium-ion batteries due to its high capacity, low cost, and abundant resources. However, the available capacity and low initial Coulombic efficiency (ICE) limits the practical application of hard carbon anode. This issue results from the unclear understanding of the Na + storage mechanism in hard carbon. In this work, a series of hard carbons with different microstructures are synthesized through an “up to down” approach by using a simple ball-milling method to illustrate the sodium-ion storage mechanism. The results demonstrate that ball-milled hard carbon with more defects and smaller microcrystalline size shows less low-potential-plateau capacity and lower ICE, which provides further evidence to the “adsorption–insertion” mechanism. This work might give a new perspective to design hard carbon material with a proper structure for efficient sodium-ion storage to develop high-performance sodium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yafang Zhao,Kai Zhang,Jun Zheng,Yanmei Zhao,Xiaokang Cai,Chao Liu,Ming Zhang,Zhongrong Shen
The closed pores resulting from distortion of the graphite domain structure are crucial for enhancing the reversible capacity of sodium storage in the hard carbon plateau region, as well as achieving a high initial Coulombic efficiency. In this study, we propose a method to enhance the reversible capacity of sodium storage in the hard carbon nanosphere plateau region by utilizing terephthalaldehyde (C8H6O2) and resorcinol (C6H6O2) for modulating closed pore size and graphite domain distribution through an aldol condensation reaction. The structural characterization reveals that an increase in the proportion of sp2 C in the precursor structure leads to graphite domains that are more easily twisted, leading to the formation of closed pores with smaller sizes during high-temperature pyrolysis. The target sample (PRHC-1500) exhibits a plateau capacity proportion of 59.23% and an initial Coulombic efficiency (ICE) of 81.14% in the half-cell. Additionally, the Coulombic efficiency remained at 100% even after undergoing 1000 cycles at a current density of 1600 mA g–1, thereby demonstrating exceptional cycling performance. This paper presents a valuable reference for modulating the closed-pore structure in hard carbon nanospheres by carefully selecting appropriate precursors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xin Xu,Yawen Qiu,Zichen Len,Zongquan Chen,Wenxuan Zhu,Wenqing Zhao,Yue Dai,Liang Cao,Hongbo Geng
Molybdenum disulfide (MoS 2 ) has garnered attention as a promising anode material for sodium-ion batteries due to its high theoretical capacity and unique lamellar texture. Nevertheless, unmodified MoS 2 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 MoS 2 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 MoS 2 , resulting in enhanced Na-ion diffusion rate, improved reaction kinetics and reduced activation energy compared to bare MoS 2 . 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 MoS 2 -based anode for sodium ion batteries .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Batteries-Basel
·
2022
·Vol. 8
·期 9
·115
·
IF 5.938
Yuteng Gong,Chengxin Yu,Yu Li,Ji Qian,Chuan Wu,Ying Bai
Hard carbon (HC) has attracted extensive attention due to its rich material source, environmental non-toxicity, superior sodium storage capacity, and lower sodium storage potential, and is considered most likely to be a commercial anode material for sodium-ion batteries (SIBs). Nevertheless, the limited initial Coulombic efficiency (ICE) of HC is the main bottleneck hindering its practical application. To alleviate this issue, herein, a ZrO2coating was skillfully constructed by using a facile liquid phase coating method. The ZrO2coating can act as a physical barrier to prevent direct contact between the HC surface and the electrolyte, thus effectively reducing irreversible sodium adsorption and inhibiting the continuous decomposition of the electrolyte. Meanwhile, this fresh interface can contribute to the generation of a thinner solid electrolyte interface (SEI) with high ionic conductivity. As a result, the ICE of the ZrO2-coated HC electrode can be optimized up to 79.2% (64.4% for pristine HC). Furthermore, the ZrO2-coated HC electrode delivers outstanding cyclic stability so that the capacity retention rate can reach 82.6% after 2000 cycles at 1 A g−1(55.8% for pristine HC). This work provides a flexible and versatile surface modification method to improve the electrochemical property of HC, and hopefully accelerate the practical application of HC anodes for SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Green Energy & Environment
·
2024
·
IF 10.7
Wei Wu,Zhenglin Hu,Zhengfei Zhao,Aoxuan Wang,Jiayan Luo
Hard carbon (HC) is widely used in sodium-ion batteries (SIBs), but its performance has always been limited by low initial Coulombic efficiency (ICE) and cycling stability. Cathode compensation agent is a favorable strategy to make up for the loss of active sodium ions consumed by HC anode. Yet it lacks agent that effectively decomposes to increase the active sodium ions as well as regulate carbon defects for decreasing the irreversible sodium ions consumption. Here, we propose 1,2-dihydroxybenzene Na salt (NaDB) as a cathode compensation agent with high specific capacity (347.9 mAh g −1 ), lower desodiation potential (2.4–2.8 V) and high utilization (99%). Meanwhile, its byproduct could functionalize HC with more C O groups and promote its reversible capacity. Consequently, the presodiation hard carbon (pHC) anode exhibits highly reversible capacity of 204.7 mAh g −1 with 98% retention at 5 C rate over 1000 cycles. Moreover, with 5 wt% NaDB initially coated on the Na 3 V 2 (PO 4 ) 3 (NVP) cathode, the capacity retention of NVP + NaDB|HC cell could increase from 22% to 89% after 1000 cycles at 1 C rate. This work provides a new avenue to improve reversible capacity and cycling performance of SIBs through designing functional cathode compensation agent.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Energy Technology
·
2022
·Vol. 10
·期 7
·2200269
·
IF 4.149
Yang Luo,Yicheng Deng,Yifei Shen,Hui Li,Yuliang Cao,Xinping Ai
Chemical prelithiation is considered to be a facile and efficient strategy to compensate the initial irreversible capacity loss of anode materials for achieving full capacity utilization of Li-ion batteries (LIBs). However, most of the prelithiation reagents reported so far are difficult to apply for commercially used graphite (Gr) anode due to their higher redox potentials than the formation potential of graphite–lithium compounds and the co-intercalation behavior in the interlayers of Gr anode, causing the exfoliation and destruction of Gr structure during prelithiation process. Herein, a new prelithiation solution for Gr anode by using lithium naphthalenide as a lithiation reagent and 2-methyl tetrahydrofuran as a reduction-tolerant solvent is demonstrated. This prelithiation solution has a very low redox potential of 0.19 V and can controllably and efficiently prelithiate Gr anode to a required degree in a few minutes without the solvent co-intercalation. Benefiting from these advantages, the Gr anode prelithiated for 3 min exhibits a high initial Coulombic efficiency of 100%, a better rate capability, and higher cycling capacity retention than conventional pristine Gr anode. Particularly, this prelithiation solution is low cost, easily synthesized, and recycled for industrial production, thus offering a practical convenience for LIBs manufacture.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Yating Zhang,Yanping Hu,Youyu Zhu,Xue Li,Peng Chang,Keke Li,Yicheng Wang,Yuan Liu
Benefiting from abundant resources, low price, and high carbon content, coal is considered as one of the most promising precursors of carbon-based anode materials for sodium-ion batteries. However, the application of coal-based carbon anode materials has been enormously restricted due to its poor sodium storage capacity and low initial Coulombic efficiency (ICE). In this work, a cross-linked polymeric binder [sodium alginate (SA)/ poly(acrylic acid) (PAA)] combining the molecular structure advantages of SA and PAA has been successfully designed. The SA/PAA binder has a strong interaction with coal-based carbon materials through covalent bonds, which can validly reduce its defect sites and inhibit the decomposition of the electrolyte. In addition, the cross-linking structure of the SA/PAA binder improves the bonding capacity and mechanical property of the coal-based carbon anode materials, significantly enhancing their rate and cycling performance. Simultaneously, the inclusion of a binder with Na-ions can compensate for the irreversible loss of sodium in coal-based carbon anode materials, thereby achieving higher ICE (82.08%) and reversible capacity (361.4 mA h g–1 at 0.1C). Therefore, the SA/PAA binder can be considered as a candidate binder for sodium-ion batteries, considering its desirable mechanical properties and electrochemical performances.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Rongzhang Yang,Hao Liang,Meiran Chen,Fengqi Lu
Layer SnS 2 has been garnered significant attention for next-generation lithium-ion batteries (LIBs), due to its abundant resources and high theoretical capacity. However, the low initial Coulombic efficiency, large volume expansion and structural degradation have significantly hindered its application in LIBs. Herein, the layer Sn 0.7 (MoFeCoNiV) 0.3 S 2 nanosheets (HE3-SnS 2 ) grown on the conductive substrate carbon cloth (CC) is synthesized by one-step hydrothermal method. Multiple elements doping strategy not only increases the conformational entropy which will improve the structural stability of during cycling, but also enlarges the interlayer spacing which benefits for lithium-ion transfer. As a result, the additive-free integrated CC@HE3-SnS 2 electrode achieves a high reversible specific capacity of 1204.9 mAh g −1 with a high initial Coulombic efficiency of 94.7 % at 1C, and maintains 1011.4 mAh g −1 after 100 cycles. Specifically, the CC@HE3-SnS 2 anode exhibits excellent rate capability of 670.8 mAh g −1 at 10C. Moreover, the full cell based on CC@HE3-SnS 2 anode and commercial LiCoO 2 cathode displays a stable capacity retention of 862.7 mAh g −1 after 100 cycles at 1C. The entropy-stabilized SnS 2 -based anode with high initial Coulombic efficiency and rate capability has a competitive candidate for LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 24
·2101181
·
IF 18.808
Yifei Shen,Xiaohui Shen,Mei Yang,Jiangfeng Qian,Yuliang Cao,Hanxi Yang,Yang Luo,Xinping Ai
Chemical prelithiation is an effective approach to elevate the initial Coulombic efficiency (ICE) and energy utilization of Li-ion battery electrodes. However, this approach fails to operate for the most commonly used graphite (Gr) anode, because all the prelithiation reagents reported so far have a much higher redox potential than Gr (≈0.2 V). Based on ionic solvation and coordination chemistry, for the first time, a new design strategy is proposed for prelithiation solution by selecting a strong electron-donating, sterically hindered, and chemically stable solvent to tune the redox potential of prelithiation reagent and also to prevent the solvent co-intercalation during prelithiation process, thus enabling a successful prelithiation of Gr anodes. By theoretical prediction and experimental evaluation, a chemical prelithiation solution, lithium biphenylide/2-methyl tetrahydrofuran, is successfully developed, which can prelithiate Gr anodes accurately to a desired state in few minutes without destroying the lattice structure of Gr. When the prelithiated Gr anodes (pGr) are paired with the conventional cathodes, the full cells demonstrate significantly improved ICEs and higher energy densities than their counterparts using pristine Gr anodes, showing a great prospect for wide Li-ion battery applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Lijing Yan,Huiwen Zhang,Zeheng Li,Xuehui Gao,Hongbo Wang,Zhan Lin,Min Ling,Chengdu Liang
Nanostructured silicon has been regarded as a promising next-generation anode material for high energy density lithium-ion batteries. However, costly synthesis methods and low initial coulombic efficiency are still two major challenges for its practical application. Herein, secondary submicron silicon materials composed of nanoparticles are successfully prepared by a simple, low-cost, and efficient high energy mechanical milling method. The initial coulombic efficiency of the as-prepared silicon anode reaches 89.14% with a first discharge specific capacity of 3233 mA h g–1 at 100 mA g–1. In light of a low-cost precursor, facile approach, and high initial coulombic efficiency, this work may provide guidance and enlightenment in synthesizing nanostructured silicon with a secondary structure as anode materials for lithium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 40
·2206615
·
IF 19.924
Zeheng Li,Weiting Tang,Yajun Yang,Guoyong Lai,Zheng Lin,Huayan Xiao,Juncheng Qiu,Xiujuan Wei,Shuxing Wu,Zhan Lin
The low initial Coulombic efficiency (ICE) and insufficient cycling lives of silicon (Si)-based anodes seriously hinder their eventual introduction into next-generation high-energy-density lithium–ion batteries (LIBs). Herein, an engineering prelithiation binder strategy based on polyacrylic acid (Li x PAA) is proposed for representative SiO x anodes. The ICEs and cycling lives of SiO x anodes are significantly improved by precisely controlling the lithiation degree of PAA binder. The ICE of the high-loading (3.0 mg cm −2 ) SiO x electrode increases by 10.9% when the Li 0.75 PAA binder replaces the PAA binder. Moreover, the working mechanism of the lithiation binder strategy to improve the electrochemical performances (especially for ICE) is systematically investigated, which is universally applied to other Si anodes such as Si nanoparticles and Si/graphite. This universal binder strategy and proposed working mechanism provide enlightenment on constructing high-ICE, high-energy-density, and long-life Si-based anodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Xianwei Li,Zhenqian Wu,Xudong Ma,Ling Xin,Xiao Yu,Yong Liu
Carbonaceous materials , such as hard carbon and porous carbon , have gained great attentions as the anode materials for Na-ion batteries (NIBs). However, their defects and disordered structure cause the low initial coulombic efficiency (ICE), high-potential slope region and small charge capacity below 0.5 V. Herein, a structurally stable MOF contained 1,3,5-triazine-2,4,6-triamine moieties, belonging to the tetragonal space group I 4/m, is synthesized. On this basis, MOF-derived crystalline carbon with graphite-like crystal, instead of amorphous porous carbon, can be obtained due to slow pyrolysis of MOF framework along with timely and sufficient reassembly of the pyrolyzed carbon atoms into graphite-like crystal under graphite-induced condition. The graphite-like crystal has a geometrically similar unit cell to graphite crystal but with a magnification ratio of 1.25, yielding proportionally expanded d-spacing of (002) plane (4.2 Å), which enables the reversible Na + intercalation/de-intercalation. When applied in NIBs, it exhibits a very high ICE of 96.0% and reversible charge capacity of 356.2 mAh g −1 , reaching the advanced level of graphite applied in LIBs . More importantly, its charge capacity below 0.5 V can account for 90% of the total charge capacity, which is also the key parameter to effectively increase the energy density of full batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）