Particuology
·
2025
·
IF 4.3
Zhilong Wang,Jianhang Lu,Jiatan Zhang,Feixiang Li,Xinhao Yu,Bo Sun,Yahui Cui,Tong Zhao
This paper clarified the network structure of the lithium-ion battery (LIB) slurry under effects of composite conductive agent amount and carbon black (CB) to graphene (Gr) mass ratio ( m’ CB : m’ Gr ). Four different amounts of composite conductive agent which are φ com1 = 0.25%, φ com2 = 0.5%, φ com3 = 0.75% and φ com4 = 1% are selected as the conductive materials for LIB slurries. Meanwhile, to discriminate the individual impacts of CB and Gr, two distinct mass ratios of CB to Gr, namely, m’ CB : m’ Gr = 1:2 and m’ CB : m’ Gr = 2:1, are additionally chosen. Moreover, the influence of single conductive additive agent CB or Gr with the same amount as composite conductive agent on the network structure of the LIB slurry is also investigated. Furthermore, Electrochemical Impedance Spectroscopy (EIS), Scanning Electron Microscopy (SEM) and Raman experiments are performed to obtain the electrochemical, morphological and Raman characterizations of LIB slurry, respectively. After analyzing the experimental results, the main conclusion shows that the synergistic interaction between CB and Gr ensures a high-level conductive efficiency because of minimizing the amount of the conductive agent and increasing the amount of LiCoO 2 particles to the utmost degree, which has the potential to substantially elevating the energy density of LIB.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2023
·
IF 3.6
Ya Wen,Huimin Liu,Xunyong Jiang
Because of its unique structure and superior properties, graphene has been used a lot in lithium-ion batteries. The common way of adding graphene not only increases the preparation process but also makes it easy to stack graphene. This paper proposes a strategy to integrate the preparation process of graphene with the preparation process of electrode slurry for lithium-ion batteries. In this paper, graphene dispersions were prepared by the liquid-phase shearing method. On this basis, the centrifugal process was removed and a one-step method was proposed to prepare graphite conductive slurry. The initial capacity of the battery was increased by 8% when the graphene dispersion prepared by the liquid-phase method was used as the graphite anode conductive agent for lithium-ion batteries. The graphite conductive slurry prepared by the one-step method can replace acetylene black, the conductive agent in conventional graphite electrodes. And the initial capacity of the battery was improved by 22% and 12.8% compared to that of the battery with acetylene black and the prepared graphene dispersion as the conductive agent, respectively. The graphene conductive slurry as graphite anode conductive agent can increase the graphite capacity and improve the cycling and multiplicity performance of the anode material. The conductive agent is easy to prepare, low cost, and can effectively improve graphite anode's electrochemical charge and discharge performance.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Ya Wen,Huimin Liu,Xunyong Jiang
Graphene is widely used in lithium-ion batteries due to its good electrical conductivity . Generally, graphene is added to lithium-ion batteries in the form of powder directly or by dispersing the powder in a solution before adding it. This paper proposes a one-pot method to prepare graphite anode electrode slurry. The graphite and binder are put into the NMP(N-Methyl-2-pyrrolidone) solution. Then the mixed solution is stirred at high speed to prepare the electrode slurry. This method is characterized by the integration of the graphene preparation with the electrode slurry preparation process. The capacity of graphite anode materials prepared using the one-pot method without adding acetylene black conductive agent after cycling and stabilization is comparable to that of graphite electrodes with 10 % acetylene black conductive agent added by the conventional process. When 5 % acetylene black was added to the electrodes prepared by the one-pot method, the initial capacity of graphite electrodes was increased by 31.8 % compared with that of graphite electrodes with 10 % conductive agent added by the conventional process, and the capacity was increased by 12.5 % after cycle stabilization. The one-pot method used 50 % less acetylene black than the traditional process and made graphite electrodes with better electrochemical charging, discharging, and rate performance.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Renjie He,Chuyue Cai,Siwu Li,Shijie Cheng,Jia Xie
The increasing demand for large-scale energy storage propels the development of lithium-ion batteries with high energy and high power density. Low tortuosity electrodes with aligned straight channels have proved to be effective in building such batteries. However, manufacturing such low tortuosity electrodes in large scale remains extremely challenging. In contrast, high-performance electrodes with customized gradients of materials and porosity are possible to be made by industrial roll-to-roll coating process. Yet, the desired design of gradients combining materials and porosity is unclear for high-performance gradient electrodes. Here, triple gradient LiFePO 4 electrodes (TGE) are fabricated featuring distribution modulation of active material, conductive agent, and porosity by combining suction filtration with the phase inversion method. The effects and mechanism of active material, conductive agent, and porosity distribution on electrode performance are analyzed by experiments. It is found that the electrode with a gradual increase of active material content from current collector to separator coupled with the distribution of conductive agent and porosity in the opposite direction, demonstrates the best rate capability, the fastest electrochemical reaction kinetics, and the highest utilization of active material. This work provides valuable insights into the design of gradient electrodes with high performance and high potential in application.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Wenliang Sun,Rusi Hao
Herein, porous activated carbon was synthesized from highland barley straw by phosphoric acid activation and used as a conductive agent for LiFePO 4 cathodes. The morphology and microstructure are characterized by scanning electron microscopy and nitrogen adsorption and desorption. The results show that the porous activated carbon convenient three-dimensional porous microstructure. Compared with the conventional conductive agent carbon black Super P, the obtained porous activated carbon presents a high capacity of 153.63 mA h g -1 at 0.1 C, as well as an excellent rate performance and cycling stability. The simple method for the preparation of porous activated carbon as a conductive agent with an excellent electrochemical performance opens up a new opportunity of LiFePO4 cathodes for widespread applications in 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
ACS Applied Energy Materials
·
2025
·
IF 5.5
Zhidan Shi,Xuefeng Sha,Xianyin Song,Fan Zeng,Xueli Wu,Minghao Yu,Xingang Zhang,Rui Xu,Changzhong Jiang
Aqueous flexible supercapacitors (AFSCs) are considered to be a promising power source for wearable electronics due to their fast charging, superior stability, and high safety. However, compared to conventional energy storage devices, it is still restricted by the newly emerging issue of how to balance energy density and mechanical flexibility, which is closely relative to the specific manufacturing technology and ink process. Unfortunately, to date, research on the correlation between ink composition, device structure, capacitance, and the flexibility of supercapacitors remains rare. In this work, based on the model of activated carbon (AC) and screen-printing technology, the effects of ink formulation ratios, binder types (ethyecellulose (EC), poly(vinylidene fluoride) (PVDF), carboxymethocel (CMC), and polyacrylic latex (LA133)), dimensional characteristics of carbon-based conductive agents (acetylene black, one-dimensional carbon nanotube, two-dimensional graphene), and the thickness of screen-printing layers (1–10 layers) on the electrochemical energy storage performance and mechanical flexibility of the AFSCs are systematically studied. The results indicate that relative to the excellent flexible stability of the EC binder and large capacitance of the CMC binder, the ink with LA133 as the binder exhibits both superior capacitance and flexibility. Besides, the effectiveness of carbon-based conductive agents is that graphene is better than acetylene black, and acetylene black is much better than the carbon nanotube. When the ink composition comprises 85 wt % AC, 10 wt % acetylene black, and 5 wt % LA133, and 1–3 layers of inks are printed to fabricate the AFSCs, which display the most exceptional performance, including 91.12% of capacitance maintaining after 5000 bend–fold cycles. In contrast, for an excessively thick electrode with 10 layers of ink printing, only 19.30% of the initial capacitance is retained after the same flexible test cycle. These results illustrate the critical roles of screen-printing AFSCs from the ink process in obtaining high capacitance and flexible stability.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Mihong Cao,Lucheng Li,Wenfeng Yuan,Jun Chen
In order to solve the problems of insufficient adsorption electrolyte capacity and small specific surface area caused by the smooth surface and few pores of Super P spherical conductive particles, this work uses concentrated sulfuric acid (H 2 SO 4 ) for surface etching of Super P conductive particles to explore the influence of different etching time on the micromorphology of SP conductive agent and the behaviors of LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM-523) batteries. After etched by concentrated H 2 SO 4 , the surface of SP conductive agent changes from “capillary” structure to fluffy “plush” structure, effectively improving the conductivity specific surface area of the conductive agent particles. Compared with the pristne SP-0H conductive agent, the batteries using 1.5% of concentrated H 2 SO 4 etched SP-1H, SP-2H and SP-20H conductive agent have smaller EIS impedance value, larger area of CV curves, and smaller potential difference of the redox peaks. As a result, the initial charging/discharging capacities of SP-1H, SP-2H and SP-20H conductive batteries were 178.7/183.0, 187.6/183.9, 178.9/180.8 mAh/g with corresponding ICE of 102.4%, 98.0% and 101.1% respectively, which were much higher than the pristine SP-0H conductive battery (182.0/173.7 mAh/g with ICE of 95.4%). In addition, the SP-1H, SP-2H and SP-20H batteries also show significantly improved cycle performance and rate cycle capabilities, showing more superior comprehensive behaviors, which can provide a new modification insights for the exploration of new conductive agent in NCM-523 of high-performance lithium 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
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 14
·3484-3493
·
IF 7.779
Albert Claude Jean-Pierre Daubry,Zhuijun Xu,Ming Yang,Ya-Jun Cheng,Yonggao Xia,Xile Hu
Lithium-ion batteries with enhanced rate performance are of crucial importance for practical applications. Extensive studies on the structural design and surface modification of electrode materials with the aim of improving the rate performance have been reported. Here we describe a new concept to enhance the rate capability by incorporating a tiny amount of metal species into the electron conductive agent. We show that the Si/C composite anode exhibits increased capabilities at high current densities when oxidized Ketjen black (KJB) with incorporated cobalt (Co-ox-KJB) is used as the electron conductive agent. Compared with the pristine KJB, the reversible capacities of the Si/C electrode with the Co-ox-KJB are increased by 180% on average at 1.50 A g−1 (279 mA h g−1vs. 73 mA h g−1, respectively). A synergistic contribution from enhanced electron conductivity by Co incorporation, improved affinity towards the electrolyte and an enhanced desolvation process by surface functional groups is responsible for the improved electrochemical performance. This approach is applicable for super P-based electron conductive agents as well.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Mihong Cao,Luyi Wang,Qian Zhang,He Zhang,Shengwen Zhong,Jun Chen
In this work, a conductive slurry containing CNTs is used as a modification reagent for the Super-P (SP) conductive agent. After CNTs is recombined with SP, spherical SP particles with a diameter of about 60 nm are evenly dispersed on the surface of CNTs nanotubes with a diameter of 20 nm, which effectively improves the specific surface area of the conductive agent. As a result, the battery using 1.5 % CNTs/SP composite conductive agent shows a smaller EIS impedance value, which makes the comprehensive behaviors of the LiNi 0.5 Co 0.2 Mn 0.3 O 2 battery significantly improved. The CNTs/SP battery shows larger CV curve area and smaller potential difference between oxidation and reduction peaks. In addition, the initial charge and discharge capacity of CNTs/SP battery are 181.7 and 184.7 mAh/g respectively with initial Coulombic efficiency of 98.4%, which are much higher than the pristine SP battery (173.7 and 182.0 mAh/g respectively with initial Coulombic efficiency of 95.4 %). After 70 cycles, the discharge capacity of CNTs/SP battery can still remain at 175.3 mAh/g with capacity retention ratio of 97.2 %, which are also much higher than the pristine SP battery (142.5 mAh/g with capacity retention ratio of 82.8 %). Moreover, compared with the pristine SP batteries, the CNTs/SP batteries show larger discharge capacities at different rates of 0.2 C, 0.5 C, 1.0 C, 2.0 C, 3.0 C and 5.0 C. After combining SP with CNTs nanowires, the discharge capacity, initial coulombic efficiency, cycle stability and rate capability of LiNi 0.5 Co 0.2 Mn 0.3 O 2 electrode are effectively improved, which provides a new idea for the development of novel conductive agent for high-performance cathode materials of lithium ion batteries .
研究领域:
材料科学
·
电化学
·
能源存储技术
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2025
·
IF 6.6
Shaohai Dong,Yuhang Lyu,Zhan-Sheng Guo
Electrolyte wettability significantly effects the electrochemical performance of lithium-ion batteries (LIBs). In this study, buoyancy testing is employed to accurately measure the force-time curve of electrolyte penetration into the electrodes and thereby calculate the wettability rate. Electrochemical performance is comprehensively evaluated through CR2025 coin half-cell testing, four-point probe analysis, and C-rate cycling experiments. The effects of conductive agent content, morphology, and size on wettability, conductivity and electrochemical performance are investigated. The results show that carbon nanotube (CNT) conductive agent have strong effect on electrolyte wettability, conductivity, and electrochemical performance. Electrodes with 3% CNT content show a 48.9% increase in wettability, a 95.7% reduction in electrode resistance, and a 10% increase in cycle life compared to 1% CNT. Wettability and conductivity have an equally important effect on electrochemical properties. Larger CNT sizes improve wettability but increase electrode resistance, negatively impacting LIB performance. CNT conductive agents facilitate electrolyte movement along the nanotubes, reducing tortuosity and enhancing wettability. Optical observation of the wetting process on the surface and cross-section of the pure conductive agent electrode strongly supports this conclusion. These results provide valuable insight into optimizing LIB performance by manipulating CNT properties and incorporating them as conductive agents.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOM
·
2020
·Vol. 72
·期 8
·3003-3010
·
IF 2.054
Zou Jingyi,Sun Xiaogang,Li Rui,He Qiang
The electrochemical performance of fluorinated multiwalled carbon nanotubes (F-MWCNTs) as a new type of conductive agent for Li–SnO 2 batteries has been studied. Multiwalled carbon nanotubes (MWCNTs) were fluorinated to obtain F-MWCNTs with core–shell structure (fluorocarbon atomic ratio C/F = 1:1). The unique tubular structure of the F-MWCNTs allows more Li + ions and electrons to enter the channel around the active material CF 1 , which increases the electrochemical reaction effect and reduces the polarization effect of the batteries, thereby improving the utilization of the active material, and the capacity as well as the stability of the discharge plateau of the resulting batteries. The F-MWCNTs are an excellent alternative to the traditional conductive graphite. The SnO 2 @F-MWCNTs battery showed high specific capacity (1588.71 mAh g −1 at 100 mA g −1 ), excellent cycle performance (962.92 mAh g −1 after 100 cycles), excellent coulombic efficiency (99.89%), and low internal resistance in repeated electrochemical tests.
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Lin Wang,Shijie Li,Na Li,Wei-Li Song,Hao-Sen Chen,Shuqiang Jiao
The consistency of lithium-ion battery performance is the key factor affecting the safety and cycle life of battery packs. Surface engineering of electrodes in production processes plays an important role in improving the consistency of battery performance. In this study, the drying process in the electrode manufacturing process is studied as the effect on surface engineering of the electrode materials, with consideration on impacting the battery performance. Specifically, the solid content of the slurry and drying temperature are considered to be the two factors that affect conductive agent dispersion uniformity in the porous electrodes. To achieve surface engineering on the dispersion uniformity of the conductive agent, the optimal processing parameters can be obtained by adjusting the temperature and solid content of the slurry. The mechanism of dispersion uniformity of the conductive agent is mainly related to the polyvinylidene fluoride grid structure. In the manufacturing of lithium-ion batteries, the electrode coated with 66% solid slurry and dried at 90–100 °C presents stable energy storage performance, which is beneficial to maintain the stable performance of the battery pack in the application.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）