Effect of particle size and purity on the low temperature electrochemical performance of LiFePO4/C cathode material

Zhao, Ning; Li, Yongsheng; Zhao, Xinxin; Xing, Zhi; Liang, Guangchuan

doi:10.1016/j.jallcom.2016.04.070

Cited by 105 publications

(30 citation statements)

References 58 publications

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“…[3][4][5][6] As a consequence, numerous pioneering works have been carried out and reported on improving its physical properties and electrochemical performance by doping with alien atoms, [7][8][9] surface coating, admixing with some conducting materials 4,10 and decreasing particle size or changing crystal morphology. [10][11][12][13][14] Among those techniques, coating advanced carbon materials and admixing with conductive additives are considered to be the most effective and practical methods to improve the electrochemical performance of LiFePO 4 . Up to now, numerous advanced carbon materials consisting of carbon bers (one-dimensional), graphene (twodimensional), and 3D graphene skeletons (three-dimensional) have been demonstrated in constructing continuous conductive networks to elevate LiFePO 4 electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

Effects of graphene with different sizes as conductive additives on the electrochemical performance of a LiFePO₄cathode

et al. 2017

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This paper aims to demonstrate whether graphene nanosheets (GN) with different sizes as conductive additives are able to affect the electrochemical performance of a LiFePO 4 (LFP) cathode. The results of electrochemical measurements present that graphene nanosheets (GN) and Super-P (SP) used as conductive additives simultaneously could construct an effective electronic conducting network and achieve excellent electrochemical performance when compared with traditional carbon materials. A LFP with small-size GN shows better specific capacity and rate performance than those with medium-size and large-size GN, and the LFP with large-size GN displays a poor rate performance. The results indicate that the specific capacity and rate performance tend to worsen with the increase of the size of graphene, owing to the length of the lithium ion transport path being prolonged and the ionic conductivity decreasing greatly by the "barrier effect" of graphene.

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Section: Introductionmentioning

confidence: 99%

Effects of graphene with different sizes as conductive additives on the electrochemical performance of a LiFePO₄cathode

et al. 2017

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“…However, its low temperature performance is not outstanding [18]. The parameters of the LiFePO4 cell used in this study are shown in Table 1.…”

Section: Battery Modelmentioning

confidence: 99%

Optimization of Battery Capacity Decay for Semi-Active Hybrid Energy Storage System Equipped on Electric City Bus

Wang

2017

Energies

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Abstract:In view of severe changes in temperature during different seasons in cold areas of northern China, the decay of battery capacity of electric vehicles poses a problem. This paper uses an electric bus power system with semi-active hybrid energy storage system (HESS) as the research object and proposes a convex power distribution strategy to optimize the battery current that represents degradation of battery capacity based on the analysis of semi-empirical LiFePO 4 battery life decline model. Simulation results show that, at a room temperature of 25 • C, during a daily trip organized by the Harbin City Driving Cycle including four cycle lines and four charging phases, the percentage of battery degradation was 9.6 × 10 −3 %. According to the average temperature of different months in Harbin, the percentage of battery degradation of the power distribution strategy proposed in this paper is 3.15% in one year; the electric bus can operate for 6.4 years until its capacity reduces to 80% of its initial value, and it can operate for 0.51 year more than the rule-based power distribution strategy.

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“…A considerable number of methods have been adopted with the aim of alleviating the above shortcomings. These methods can be categorized into two main classes: particle size control (Prosini et al, 2003;Zhao et al, 2016) and conductive material coating (Chang et al, 2019;Han et al, 2019;Ma et al, 2019;Tao et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

One-Step Microwave Synthesis of Micro/Nanoscale LiFePO4/Graphene Cathode With High Performance for Lithium-Ion Batteries

Liu

Yan

et al. 2020

Front. Chem.

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In this study, micro/nanoscale LiFePO 4 /graphene composites are synthesized successfully using a one-step microwave heating method. One-step microwave heating can simplify the reduction step of graphene oxide and provide a convenient, economical, and effective method of preparing graphene composites. The structural analysis shows that LiFePO 4 /graphene has high phase purity and crystallinity. The morphological analysis shows that LiFePO 4 /graphene microspheres and micron blocks are composed of densely aggregated nanoparticles; the nanoparticle size can shorten the diffusion path of lithium ions and thus increase the lithium-ion diffusion rate. Additionally, the graphene sheets can provide a rapid transport path for electrons, thus increasing the electronic conductivity of the material. Furthermore, the nanoparticles being packed into the micron graphene sheets can ensure stability in the electrolyte during charging and discharging. Raman analysis reveals that the graphene has a high degree of graphitization. Electrochemical analysis shows that the LiFePO 4 /graphene has an excellent capacity, high rate performance, and cycle stability. The discharge capacities are 166.3, 156.1, 143.0, 132.4, and 120.9 mAh g −1 at rates of 0.1, 1, 3, 5, and 10 C, respectively. The superior electrochemical performance can be ascribed to the synergy of the shorter lithium-ion diffusion path achieved by LiFePO 4 nanoparticles and the conductive networks of graphene.

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Effect of particle size and purity on the low temperature electrochemical performance of LiFePO4/C cathode material

Cited by 105 publications

References 58 publications

Effects of graphene with different sizes as conductive additives on the electrochemical performance of a LiFePO₄cathode

Effects of graphene with different sizes as conductive additives on the electrochemical performance of a LiFePO₄cathode

Optimization of Battery Capacity Decay for Semi-Active Hybrid Energy Storage System Equipped on Electric City Bus

One-Step Microwave Synthesis of Micro/Nanoscale LiFePO4/Graphene Cathode With High Performance for Lithium-Ion Batteries

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Effect of particle size and purity on the low temperature electrochemical performance of LiFePO4/C cathode material

Cited by 105 publications

References 58 publications

Effects of graphene with different sizes as conductive additives on the electrochemical performance of a LiFePO4cathode

Effects of graphene with different sizes as conductive additives on the electrochemical performance of a LiFePO4cathode

Optimization of Battery Capacity Decay for Semi-Active Hybrid Energy Storage System Equipped on Electric City Bus

One-Step Microwave Synthesis of Micro/Nanoscale LiFePO4/Graphene Cathode With High Performance for Lithium-Ion Batteries

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Effects of graphene with different sizes as conductive additives on the electrochemical performance of a LiFePO₄cathode

Effects of graphene with different sizes as conductive additives on the electrochemical performance of a LiFePO₄cathode