Journal of Energy Storage
·
2024
·
IF 8.9
Mengna Shi,Tie Ma,Chenqi Wang,Changcheng Liu,Que Huang,Li Guo,Dan Li
The thermal stability of lithiated graphite plays an important role in the thermal safety of lithium-ion batteries (LIBs). However, a safer graphite anode usually leads to a lower energy density. This article starts from multiple hazardous factors of lithiated graphite when thermal runaway occurs, considering the impact of defects on the electrochemical performance and thermal safety of graphite electrodes. In this study, turbostratic graphite was prepared as the anode for LIBs. The stacking of graphite was altered to form narrow pores and spherical aggregates, and introducing defects. By varying the ball-milling time, the structural changes of different ball-milled graphites were analyzed. The impact mechanism of defect structure on electrode electrochemical performance and safety performance was investigated. The results show that the spherical structure and large specific surface area are beneficial to increase the active sites and delay the self-heating of the battery. The formation of defects and pores increases the adsorption sites, which makes the surface adsorption of Li + dominant and improves the ion diffusion. In addition, the dominance of surface adsorption and desorption effectively suppresses the problem of graphite flake peeling and intensified thermal runaway caused by graphite phase transition and lithium evolution heat release at high temperature. The thermal safety test was carried out by accelerated calorimeter (ARC), and its thermodynamics and reaction kinetics were quantitatively analyzed. It was proved that the introduction of surface adsorption lithium storage method successfully delayed the thermal runaway of the battery, realizing the balance between high electrochemical performance and high safety.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Bo Zheng,Wang Rui,Wang Bin,Sunny Sanjay,Zhao Yuping,Ge Kangkang,Xu Kui,Song Yajing,Raymundo-Piñero Encarnacion,Lin Zifeng,Shao Hui,Yu Qian,Yan Jianhua,Cen Kefa,Taberna Pierre-Louis,Simon Patrice
Clarifying the relationship between ion desolvation, ion-electrode interactions, and charge storage capacity during ion intercalation in host electrode materials is crucial for advancing fast and efficient energy storage systems. However, the absence of direct evidence for ion desolvation and lack of detailed understanding of the interactions between surface terminations and intercalated cations (Li ions)/solvents hinder the exploration of their effects on energy storage mechanisms. In this paper, we study the intercalation of Li ions from a non-aqueous electrolyte in two-dimensional metal carbides Ti 3 C 2 MXenes with different surface chemistries: HF-Ti 3 C 2 (F-, OH- and O-terminated) and MS-Ti 3 C 2 (O- and Cl-terminated) MXenes. We are able to visualize the full ion desolvation and solvents-ions co-intercalation in the interlayers of MS-MXene and HF-MXene, respectively at the atomic scale. The combination of several techniques and characterization tools reveal that the complete ion desolvation in Cl- and O-terminated MS-Ti 3 C 2 MXenes is associated with the formation of a dense solid electrolyte interface layer, resulting in improved charge storage capacity. The O-rich surface terminations of MS-MXenes are found to be responsible for the efficient Li ions storage. These findings shed lights on identifying the critical role of non-electrostatic ion-electrode interactions and ion desolvation in designing high-performance energy storage devices.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Xinhai Wang,Wensheng Yang,Shengshang Lu,Shangshu Peng,Tong Guo,Quan Xie,Qingquan Xiao,Yunjun Ruan
Aqueous potassium-ion batteries (APIBs), recognized as safe and reliable new energy devices, are considered as one of the alternatives to traditional batteries. Layered MnO 2 , serving as the main cathode, exhibits a lower specific capacity in aqueous electrolytes compared to organic systems and operates through a different reaction mechanism. The application of highly conductive graphene may effectively enhance the capacity of APIBs but could complicate the potassium storage environment. In this study, a MnO 2 cathode pre-intercalated with K + ions and grown on graphene (KMO@rGO) was developed using the microwave hydrothermal method for APIBs. KMO@rGO achieved a specific capacity of 90 mA h g −1 at a current density of 0.1 A g −1 , maintaining a capacity retention rate of >90% after 5000 cycles at 5 A g −1 . In-situ and ex-situ characterization techniques revealed the energy-storage mechanism of KMO@rGO: layered MnO 2 traps a large amount of “dead” water molecules during K + ions removal. However, the introduction of graphene enables these water molecules to escape during K + ions insertion at the cathode. The galvanostatic intermittent titration technique and density functional theory confirmed that KMO@rGO has a higher K + ions migration rate than MnO 2 . Therefore, the capacity of this cathode depends on the interaction between dead water and K + ions during the energy-storage reaction. The optimal structural alignment between layered MnO 2 and graphene allows electrons to easily flow into the external circuit. Rapid charge compensation forces numerous low-solvent K + ions to displace interlayer dead water, enhancing the capacity. This unique reaction mechanism is unprecedented in other aqueous battery studies.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yangkai Sun,Tianchi Shen,Huilin Pan,Zijian He,Bin Ru,Gongxin Dai,Shurong Wang
Optimizing the interlayer spacing and closed porosity of hard carbon (HC) is crucial for enhancing the reversible capacity of sodium-ion batteries (SIBs). Nevertheless, the unclear structure-performance relationship and the sodium storage mechanism significantly hinder the precise tuning of HC structures. Herein, this paper reports an esterified cross-linked starch-derived HC material and investigates its evolution mechanisms of microcrystalline carbon layers and closed porosity at various carbonization temperatures. By adjusting the spacing of the carbon layers and the distribution of closed pores, effective sodium ion storage is achieved. The optimized HC exhibits an initial Coulombic efficiency (ICE) of 90 % and a high reversible capacity of 376 mAh g −1 , including a plateau capacity of 246 mAh g −1 . After 100 cycles at 0.5 C, it retains a high capacity retention rate of 99.6 %. The sodium ion storage mechanism is investigated in depth using galvanostatic intermittent titration technique (GITT) and in-situ Raman, revealing that the plateau capacity is related to the insertion of sodium ions between carbon layers and the filling in pores, providing new evidence for the “adsorption-intercalation/filling” mechanism. Moreover, the assembled full-cell achieves a high energy density of 212 Wh kg −1 .
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2018
·
IF 0
Longlu Wang,Qingfeng Zhang,Jingyi Zhu,Xidong Duan,Zhi Xu,Yutang Liu,Hongguan Yang,Bingan Lu
Two-dimensional (2D) layered transition metal sulfide based materials are promising candidates for electrodes of lithium ion batteries (LIBs). As one of the representatives, molybdenum disulfide (MoS 2 ), exhibits additional reversible capacity beyond their theoretical value although the lithium storage mechanism is still poorly understood. In this report, we developed a highly conducting metallic phase 1T(octahedral)-MoS 2 based electrode with metal Mo atoms confined in “graphene nanoreactor” of abnormal lithium-storage sites, which delivered a high specific capacity of ~1800 mAh g −1 at 1 A g -1 , about 2.6 times of its intercalation reactions value. Contrary to previous reports, a new lithium-storage mechanism for the high and ever-increasing capacity was proposed. The theoretical calculations and experiments show that a major contribution to the extra capacity in MoS 2 anodes is due to Mo atoms accommodate with Li + . The Mo precipitates and their full contact with Li 2 S matrix enabled the reversible Mo→Li x Mo→Mo→1T-MoS 2 reaction during charging/discharging processes. Over prolonged cycling, per Mo atomic could accommodate six Li + ions. This new proposal could help to establish an accurate electrochemical reaction mechanism of MoS 2 LIBs, which may lead to inspiration on new methods to greatly improve the performance of the MoS 2 anode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
Small
·
2018
·Vol. 14
·期 39
·1802694
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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
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Jie Shu,Kaiqiang Wu,Pengfei Wang,Peng Li,Xiaoting Lin,Lianyi Shao,Miao Shui,Nengbing Long,Dongjie Wang
Na 2 Li 2 Ti 6 O 14 is synthesized by a simple solid state method between 500 and 900 °C. It is found that pure Na 2 Li 2 Ti 6 O 14 is only formed at 800 °C or above. The tap density of as-prepared Na 2 Li 2 Ti 6 O 14 is about 1.52 g cm −3 . Particle morphology analysis shows that the size of Na 2 Li 2 Ti 6 O 14 gradually increases with the increase of sintering temperature. Calcined at 900 °C, Na 2 Li 2 Ti 6 O 14 shows slight particle aggregation and melting. As a result, Na 2 Li 2 Ti 6 O 14 formed at 800 °C reveals higher electrochemical activity than the sample obtained at 900 °C. Therefore, the suitable preparation temperature for Na 2 Li 2 Ti 6 O 14 by solid state reaction is 800 °C. Charge–discharge results show that Na 2 Li 2 Ti 6 O 14 prepared at 800 °C can deliver a reversible capacity of 89.9 mAh g −1 at 100 mA g −1 , 81.3 mAh g −1 at 200 mA g −1 , 75.2 mAh g −1 at 300 mA g −1 , 69.6 mAh g −1 at 400 mA g −1 and 65.5 mAh g −1 at 500 mA g −1 . Besides, the lithium storage mechanism in Na 2 Li 2 Ti 6 O 14 is also studied by various in-situ and ex-situ methods, which prove that the structural evolution is highly reversible for Na 2 Li 2 Ti 6 O 14 during lithiation/delithiation process.
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 THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 7
·070513
·
IF 3.721
Dandan Zhu,Yuhao Huang,Lei Zhang,Hui Fan,Hongyu Wang
PF6− intercalated graphite compounds have found promising applications in dual-ion batteries. However, the anion storage mechanisms of graphite positive electrode in different organic solvents have not been well understood yet, especially in the mixed solvents. In this report, PF6− storage behavior in graphite electrode in 1 M LiPF6-GBL/EMC solutions is studied by conventional electrochemical tests like galvano-static charge-discharge and cyclic voltammetry at first. Then the combined electrochemical in situ characterizations including both in situ X-ray diffraction and electrochemical quartz crystal balance on graphite electrodes are carried out to trace their changes of crystal structure and mass during the anion storage. It is discovered that with EMC addition in the solutions, EMC rather than GBL will preferentially solvate with PF6− anion as the intercalant species. Moreover, ionic conductivity values and NMR spectra of the solutions were measured to investigate the interactions between ions and solvents inside, and are correlated with the performance of graphite electrode.
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 POWER SOURCES
·
2023
·
IF 9.2
Chang Li,Yushuang Xu,Wenjun Deng,Na Shen,Yan Chen,Chao Huang,Jinlin Zhu,Runduo Zhu,Wenxia Zou,Rui Li
Among aqueous batteries , the research on the battery employing metal as the anode is still mainly focused on the aqueous zinc-ion battery. Compared with zinc, iron has better stability for reversible deposition, lower cost, and higher specific capacity, which is suitable for aqueous batteries. In this study, an aqueous iron-organic battery is constructed by employing polyaniline as the cathode, Fe plate as the anode, and Fe(CF 3 SO 3 ) 2 as the electrolyte, which demonstrates the hybrid storage mechanism of iron plating/stripping in the anode and transmission of CF 3 SO 3 − in the cathode. The polyaniline-Fe battery delivers a specific capacity of 105.8 mAh g −1 at a current density of 0.05 A g −1 and a stable cycle performance over 5,000 cycles with almost no capacity fading at a current density of 0.2 A g −1 , which provides a new direction for the development of aqueous iron-ion 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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Dong Zeng,Heng Xiong,Lu Wu,Yuexing Zhang,Kai Qi,Xingpeng Guo,Yubing Qiu
Graphite microcrystalline carbon (GMC) is a potential candidate for lithium storage devices because of its high degree of disorder in the crystalline structure. The mechanism that affects the energy-storage ability of GMC in its capacitive coupling state is still unclear. Herein, high-energy GMC is synthesized through a dual-activation approach, and its kinetics and lithium-storage mechanism to boost lithium-ion diffusion are further investigated. The porous graphite microcrystalline provides the structural advantage in raising the Li + storage capability, promotes the rapid transfer of electrons/ions, and possesses high conductivity. The defective heterostructure stimulates the internal electric field effect, facilitating rapid charge convey and fast diffusion kinetics. The first-principles calculations reveal that the nitrogen vacancies generated in graphite crystallites provide abundant reactive sites and induce excessive electrons around the local nitrogen atoms to form negative charge centers for accelerating the conveyance of Li + . The GMC electrode displays a high capacity of 1195 mAh g −1 at 0.1 A g −1 , while the assembled GMC//GMC lithium-ion capacitor device delivers a high energy density of 190.63 Wh kg −1 at 225 W kg −1 . This work is expected to offer an in-depth mechanism of electrons/ions diffusion and lithium storage for high-energy carbon electrodes and provide rational ideas for the optimal construction of high-energy carbon-based materials.
研究领域:
材料科学
·
能源存储
·
计算材料学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Rong Niu,Jie Ding,Jiajun Chen,Zhenxin Zhao,Xiaomin Wang
Transition metal sulfide (TMs) offers ultra-high specific capacity through multi-electron transfer, showing promise for aqueous batteries. However, the poor cycling performance and the uncleared energy storage mechanism are restricted from further development. Herein, CoS 2 nanowire arrays grown on carbon cloth (CoS 2 /CC) are proposed as binder-free and self-supporting electrodes for aqueous copper-ion batteries. The energy storage mechanism is clarified by a series of ex-situ tests: a multi-electron electrode reaction through a three-step reaction of CoS 2 → CuS → Cu 7 S 4 → Cu 2 S. Electrochemical results suggest that the CoS 2 /CC cathode exhibits excellent long cycle stability (capacity retention of 99.7 % after 1000 cycles at 10 A/g) along with high specific capacity (762.3 mAh g −1 at 1 A/g). The carbon cloth with stable three-dimensional (3D) conductive structure can not only offer high-speed pathways to promote the transfer of electrons but also inhibit the volume change. Meanwhile, CoS 2 nanowire arrays with high surface-to-volume ratios can improve wettability of electrolyte and promote redox reactions. Furthermore, an advanced Zn-CoS 2 /CC hybrid ion aqueous battery reveals an energy density of 724 Wh kg −1 and an output voltage of 1.24 V, providing a promising strategy for the establishment of transition metal sulfide cathode in high-energy aqueous 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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Qirui Guo,Yaning Zhang,Chunli Li,Huiting Xu,Wenchao Peng,Jiapeng Liu
The low energy consumption, easy operation, and cost-effectiveness of capacitive deionization technology (CDI) make it exhibit significant potential for advancement in seawater desalination. To improve CDI performance, new electrode materials must be developed. Here, molybdenum disulfide (MoS 2 ) nanoflowers with large layer spacing are prepared by interlayer engineering utilizing cetyltrimethylammonium bromide (CTAB) as the intercalating agent (MoS 2 -CTAB). The enlarged layer spacing enables the MoS 2 -CTAB nanoflowers to have a larger specific surface area, thus exposing more storage sites. Meanwhile, the CTAB intercalation leads to a significant increase in the electrical conductivity of MoS 2 . The above advantages favor rapid ion insertion/extraction, which is helpful in improving CDI performance. Consequently, the MoS 2 -CTAB nanoflowers exhibits excellent desalination capacity (25.5 mg g −1 at 1.2 V) and fast desalination rate (5.1 mg g −1 min −1 ) compared with the original MoS 2 . Additionally, the storage mechanism of Na + reversible insertion and extraction in MoS 2 -CTAB nanoflowers is investigated by applying various characterizations. The design of MoS 2 -based CDI electrode materials with superior performance is made possible by this work.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 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）