Preparation and Electrochemical Properties of Multicomponent Conductive-Nanocarbon Additives for LFP Battery

NANO ◽  
2020 ◽  
Vol 15 (07) ◽  
pp. 2050093
Author(s):  
Yang Zhou ◽  
Hui Chen ◽  
He Gan ◽  
Yuxi Chen ◽  
Run Li ◽  
...  
Keyword(s):  
Current Density ◽  
Lithium Iron Phosphate ◽  
Retention Rate ◽  
Specific Capacity ◽  
Iron Phosphate ◽  
Acetylene Black ◽  
Conductive Materials ◽  
Conductive Additive ◽  
Milling Method ◽  
Point Line

The conductive additives are often used to improve the conductivity of the electrode in lithium iron phosphate battery. In this work, a series of carbon-based conductive slurries of acetylene black, carbon nanotubes and graphene were obtained by the ball milling method and applied to the cathodes of lithium iron phosphate batteries. The conductivity of the ternary conductive slurry reaches 11.98[Formula: see text]S[Formula: see text]cm[Formula: see text] and the result of Zeta potential indicates that the ternary conductive slurry has the best deposit stability. The average discharge capacity of lithium batteries with ternary conductive additive is 111.3[Formula: see text]mAh[Formula: see text]g[Formula: see text] at the current density of 10C, which is 1.9 times higher than that of acetylene black conductive additive batteries widely used nowadays. The specific capacity of the battery is 129.2[Formula: see text]mAh[Formula: see text]g[Formula: see text] after 200 cycles at the current density of 5C, and the capacity retention rate is 99.7%. The ternary conductive materials can form a continuous “point-line-surface” conductive network, increase the contact sites between lithium iron phosphate particles and conductive materials and provide a more efficient transmission path.

Excess lithium storage in LiFePO4-Carbon interface by ball-milling

2016 ◽  
Vol 09 (05) ◽  
pp. 1650053 ◽  
Author(s):  
Hua Guo ◽  
Xiaohe Song ◽  
Jiaxin Zheng ◽  
Feng Pan
Keyword(s):  
Ball Milling ◽  
Lithium Iron Phosphate ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Effective Capacity ◽  
Lithium Storage ◽  
Electrical Vehicle ◽  
Milling Method ◽  
Theoretical Specific Capacity

As one of the most popular cathode materials for high power lithium ion batteries (LIBs) of the electrical-vehicle (EV), lithium iron phosphate (LiFePO4 (LFP)) is limited to its relatively lower theoretical specific capacity of 170[Formula: see text]mAh g[Formula: see text]. To break the limits and further improve the capacity of LFP is promising but challenging. In this study, the ball-milling method is applied to the mixture of LFP and carbon, and the effective capacity larger than the theoretical one by 30[Formula: see text]mAh g[Formula: see text] is achieved. It is demonstrated that ball-milling leads to the LFP-Carbon interface to store the excess Li-ions.

Polyol Synthesis of Lithium Iron Phosphate with Carbon Nanotubes: Effect of Dispersion on Crystallinity and Electrochemical Performance

2014 ◽  
Vol 1678 ◽  
Author(s):  
Wesley D. Tennyson
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Black ◽  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
Polyol Synthesis ◽  
Battery Life ◽  
Unique Challenge ◽  
Weight Percentage ◽  
Conductive Additive ◽  
Power Capability

ABSTRACTCarbon nanotubes (CNTs) have been shown to be a viable conductive additive in Li-Ion batteries [1]. By using CNTs battery life, energy, and power capability can all be improved over carbon black, the traditional conductive additive. A significantly smaller weight percentage (5% CNTs) is needed to get the same conductivity as 20% carbon black. Many of the previous efforts found that a combination of conductive additives was most advantageous [2]. Unfortunately many of these efforts did not attend to the unique challenge that dispersing nanotubes presents and used non-optimal methods to disperse CNTs (e.g. ball milling) [3,4]. With poor dispersion a stable and resilient conductive network in the cathode is hard to form with CNTs alone. Here we investigate the formation of LiFePO₄ with CNTs using a polyol process synthesis.

Characteristics of lithium iron phosphate mixed with nano-sized acetylene black for rechargeable lithium-ion batteries

2010 ◽  
Vol 41 (1) ◽  
pp. 99-106 ◽  
Author(s):  
Guoen Sun ◽  
Bo Jin ◽  
Guangping Sun ◽  
Enmei Jin ◽  
Hal-Bon Gu ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Iron Phosphate ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Acetylene Black

scholarly journals Electrode material based on multilayer graphene oxide for chemical current sources

2021 ◽  
Vol 21 (4) ◽  
pp. 206-215
Author(s):  
Sergei V. Brudnik ◽  
◽  
Elena V. Yakovleva ◽  
Nikolay V. Gorshkov ◽  
Denis I. Artyukhov ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Current Density ◽  
Electrode Material ◽  
Retention Rate ◽  
Specific Capacity ◽  
Multilayer Graphene ◽  
Oxide Electrode ◽  
High Specific Capacity ◽  
Oxide Cathode ◽  
Symmetric Supercapacitor

The results of the studies of the electrochemical synthesis of multilayer graphene oxide were presented, and the possibility of using it as an electrode material of the supercapacitor was shown. In an alcohol suspension the thickness of the particles of multilayer graphene oxide was less than 0.1 µm with an area of more than 100 µm2. The graphene oxide-based electrode has a high specific capacity of 107 F·g−1 and a high charge retention rate of 97% after 5000 cycles. It was shown that the graphene oxide electrode had a maximum specific energy of 8.7 W·h·kg−1 at the current density of 0.1 A·g−1 and had a maximum power of 2291.1 W·kg−1 at the current density of 4 A·g−1. The application of a lithium-thionyl chloride cell with a multilayer graphene oxide cathode on a nickel grid was tested. It was found that graphene oxide synthesized using the electrochemical method is a promising electrode material for creating a symmetric supercapacitor.

Effect of LiFePO4 Cathode Thickness on Lithium Battery Performance

2015 ◽  
Vol 827 ◽  
pp. 146-150
Author(s):  
Ariska Rinda Adityarini ◽  
Eka Yoga Ramadhan ◽  
Endah Retno Dyartanti ◽  
Agus Purwanto
Keyword(s):  
Lithium Ion Battery ◽  
Polyvinylidene Fluoride ◽  
Lithium Battery ◽  
Lithium Iron Phosphate ◽  
Active Material ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Structure Characterization ◽  
Cathode Layer ◽  
Conductive Additive

Lithium ion battery is composed of three main parts, i.e. cathode, anode and electrolyte. In this work, we investigated the effect of LiFePO4 cathode composite’s thickness on performances of lithium battery. LiFePO4 cathode was prepared in a slurry that consisted of lithium iron phosphate (LiFePO4) powder as active material, acetylene black as conductive additive, polyvinylidene fluoride (PVDF) as binder, and N-methyl-2-pyrrolidone (NMP) as solvent. The slurry was then deposited on the aluminum substrate using doctor blade method in different thickness. The cathode layers were deposited with the thickness of 150, 200, 250 & 300 μm. The structure characterization of the material was analyzed by XRD, while the material’s morphology was analyzed by Scanning Electron Microscope (SEM). Performances of lithium ion battery with LiFePO4 cathode were evaluated using charge-discharge cycle test. It is found that battery made of cathode layer with 250 μm thickness shows the best performances.

Study on the impact of Fe2P phase on the electrochemical performance of LiFePO4

2017 ◽  
Vol 24 (1) ◽  
pp. 23-27 ◽  
Author(s):  
Yuan Ma ◽  
Dajun Liu
Keyword(s):  
Lithium Iron Phosphate ◽  
Active Material ◽  
Specific Capacity ◽  
High Capacity ◽  
Electrochemical Measurement ◽  
Iron Phosphate ◽  
High Rate ◽  
Solid State Method ◽  
Primary Sample ◽  
The Impact

AbstractThe research on impurity in the lithium iron phosphate has been a hot topic. Especially when prepared by the solid state method, the impurities occurred easily through high-heat sintering. But some impurity is not completely bad for the cell performance, such as Fe2P. In this paper, the influence of Fe2P has been researched. Using the magnetic separation method, the high and low contents of Fe2P in lithium iron phosphate are obtained and then compared with the primary sample. Results show that the Fe2P phase helps to improve the rate and cycling performances, but a too high content will decrease the specific capacity of the sample due to the low content of active material. It is proven with the electrochemical measurement that the Fe2P phase could enhance the electrical conductivity of cathode, but it gives electrochemical inactivity. It can be concluded that the high rate or high capacity types LiFePO4 could be obtained by controlling the content of Fe2P through adjusting the preparation process.

scholarly journals Review of Modified Nickel-Cobalt Lithium Aluminate Cathode Materials for Lithium-Ion Batteries

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Ding Wang ◽  
Weihong Liu ◽  
Xuhong Zhang ◽  
Yue Huang ◽  
Mingbiao Xu ◽  
...  
Keyword(s):  
Cathode Materials ◽  
Lithium Iron Phosphate ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Cycle Performance ◽  
Future Research ◽  
Lithium Aluminate ◽  
Nickel Cobalt ◽  
Lithium Cobaltate

Ternary nickel-cobalt lithium aluminate LiNixCoyAl1‐x‐yO2 (NCA, x≥0.8) is an essential cathode material with many vital advantages, such as lower cost and higher specific capacity compared with lithium cobaltate and lithium iron phosphate materials. However, the noticeably irreversible capacity and reduced cycle performance of NCA cathode materials have restricted their further development. To solve these problems and further improve the electrochemical performance, numerous research studies on material modification have been conducted, achieving promising results in recent years. In this work, the progress of NCA cathode materials is examined from the aspects of surface coating and bulk doping. Furthermore, future research directions for NCA cathode materials are proposed.

Nonstoichiometric Lithium Iron Phosphate Synthesized by Hydrothermal Route

2010 ◽  
Vol 178 ◽  
pp. 118-123
Author(s):  
Xiu Qin Ou ◽  
Guang Chuan Liang ◽  
Li Wang ◽  
Qing Zhu Song ◽  
Zuo Rui Wang
Keyword(s):  
Crystal Structure ◽  
Electrochemical Performance ◽  
Lithium Iron Phosphate ◽  
Retention Rate ◽  
Rate Capability ◽  
Iron Phosphate ◽  
Constant Current ◽  
Minor Effect ◽  
Hydrothermal Route ◽  
Specific Discharge

Lithium iron phosphate with varied Fe/P molar ratio was synthesized from LiOH, FeSO4, and H3PO4by hydrothermal route at 180°C for 6 h. The samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), chemical analysis, and constant current charge-discharge cycling test. It was found that at the same pH value of reaction, the Fe/P ratio had a major effect on the content of impurity phase, crystal structure and electrochemical performance of the samples. However, it had a minor effect on the morphology of the samples. A single phase structure was obtained for the samples with the Fe/P ratio of 0.97-1.02. The sample with the Fe/P ratio of 0.97 exhibited the best electrochemical behaviors, whose specific discharge capacities could reach 152.7, 144.8 and 133.2mAhg-1at 0.2C, 1C and 5C rate, respectively, with the capacity retention rate close to 100% after 50 cycles at 5C. It is believed that the excellent electrochemical performance of specific discharge capacity, rate capability and cycling stability is attributed to the nonstoichiometry of LiFePO4, which results in the Li-rich defective crystal structure and the decrease of cell parameters, thus facilitating the discharge behaviors at high rates.

Recent Progress in Capacity Enhancement of LiFePO4 Cathode for Li-Ion Batteries

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Zishan Ahsan ◽  
Bo Ding ◽  
Zhenfei Cai ◽  
Cuie Wen ◽  
Weidong Yang ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Cathode Material ◽  
Lithium Iron Phosphate ◽  
Specific Capacity ◽  
Iron Phosphate ◽  
Cycling Performance ◽  
High Rate ◽  
Particle Size Reduction ◽  
Capacity Enhancement ◽  
Li Ion

Abstract LiFePO4 (lithium iron phosphate (LFP)) is a promising cathode material due to its environmental friendliness, high cycling performance, and safety characteristics. On the basis of these advantages, many efforts have been devoted to increasing specific capacity and high-rate capacity to satisfy the requirement for next-generation batteries with higher energy density. However, the improvement of LFP capacity is mainly affected by dynamic factors such as low Li-ion diffusion coefficient and poor electrical conductivity. The electrical conductivity and the diffusion of lithium ions can be enhanced by using novel strategies such as surface modification, particle size reduction, and lattice substitution (doping), all of which lead to improved electrochemical performance. In addition, cathode prelithiation additives have been proved to be quite effective in improving initial capacity for full cell application. The aim of this review paper is to summarize the strategies of capacity enhancement, to discuss the effect of the cathode prelithiation additives on specific capacity, and to analyze how the features of LFP (including its structure and phase transformation reaction) influence electrochemical properties. Based on this literature data analysis, we gain an insight into capacity-enhancement strategies and provide perspectives for the further capacity development of LFP cathode material.

scholarly journals Полимерные комплексы никеля с лигандами саленового типа как многофункциональные компоненты катодов литий-ионных аккумуляторов

2021 ◽  
Vol 47 (2) ◽  
pp. 36
Author(s):  
Ю.А. Положенцева ◽  
М.В. Новожилова ◽  
И.А. Чепурная ◽  
М.П. Карушев
Keyword(s):  
Lithium Iron Phosphate ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Cathode Layer ◽  
Schiff Base Ligands ◽  
Electrode Layer ◽  
Polymer Binders ◽  
Polymeric Metal Complexes ◽  
Redox Active

This work describes the method of preparation of composite lithium-ion battery cathodes that allows total replacement of conventional polymer binders and electroconductive carbon black additives with redox-active conductive polymeric nickel complexes of salen-type Schiff base ligands in the electrode layer. The structure and electrochemical behavior of the electrodes prepared by this method have been investigated. Polymeric metal complexes have been shown to successfully perform the functions of binding and conductive components and also reversibly store charge in the lithium iron phosphate cathodes, which could result in the improvement of the specific capacity of the cathode layer, as compared with the conventional electrodes.

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