LiFePO4 modified Li1.02(Co0.9Fe0.1)0.98PO4 cathodes with improved lithium storage properties

Jang, Il-Chan; Son, Chang-Geun; Yang, Shoufeng; Lee, J. W.; Cho, A. R.; Aravindan, Vanchiappan; Park, Gumjae; Kang, Kisuk; Kim, W. S.; Cho, Won Il; Lee, Yun‐Sung

doi:10.1039/c1jm10574d

Cited by 50 publications

(22 citation statements)

References 18 publications

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“…The first doping approach has been the partial substitution of Co by Fe [227][228][229][230][231] and Mn [232], which amounts to mixing LiCoPO 4 with the other members of the olivine family to obtain solid solutions. We can expect from Fe and Mn substitution an increase of the stability of the lattice and less side effects with the electrolyte, and, therefore, an increase in the cycle life.…”

Section: Licopomentioning

confidence: 99%

Olivine Positive Electrodes for Li-Ion Batteries: Status and Perspectives

Mauger

Julien

2018

Batteries

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Among the compounds of the olivine family, LiMPO 4 with M = Fe, Mn, Ni, or Co, only LiFePO 4 is currently used as the active element of positive electrodes in lithium-ion batteries. However, intensive research devoted to other elements of the family has recently been successful in significantly improving their electrochemical performance, so that some of them are now promising for application in the battery industry and outperform LiFePO 4 in terms of energy density, a key parameter for use in electric vehicles in particular. The purpose of this review is to acknowledge the current state of the art and the progress that has been made recently on all the elements of the family and their solid solutions. We also discuss the results from the perspective of their potential application in the industry of Li-ion batteries.The main disadvantage of olivines with respect to other cathode chemistries for lithium batteries is the lower energy density. This is evidenced in Table 1 where we have reported the gravimetric and volumetric energy densities of LFP and two other cathode materials which have also found a market place in commercial batteries for electric vehicles: the manganese spinel LiMn 2 O 4 , and "LiNiCoAl" (NCA). In terms of energy density, the winner is clearly NCA, the cathode material used by Panasonic to manufacture the batteries of Tesla cars. However, the low energy density of LFP was not an obstacle for its success for EV applications. The top-selling EV manufacturer in the world today is BYD, which makes its own batteries. Its success comes from its choice of the LFP cathode chemistry. As an example, BYD's LFP battery used by e6 taxis in Shenzen has a driving range of 200 km and can be charged to 80% in just 20 min, or 100% in only 40 min using a BYD DC fast charger. The town has 12,000 taxis which will be electric by the end of this year, and all of the 7,000,000 buses are already electric buses, 80% being BYD buses.

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Section: Licopomentioning

confidence: 99%

Olivine Positive Electrodes for Li-Ion Batteries: Status and Perspectives

Mauger

Julien

2018

Batteries

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“…Since LiCoPO 4 always presented poor cyclic stability due to the electrolyte decomposition at high potentials and its intrinsic properties, such as the low electronic conductivity and structural instability during Li deintercalation [32,33], even though various modified strategies were employed [13,[32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51]. The effect of LiDFOB on high-voltage cathode materials can be disclosed distinctly in this system.…”

Section: Introductionmentioning

confidence: 96%

Effect of lithium difluoro(oxalate)borate (LiDFOB) additive on the performance of high-voltage lithium-ion batteries

Wei

Xing

et al. 2012

J Appl Electrochem

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Lithium difluoro(oxalato)borate (LiDFOB) was investigated as an electrolyte additive for high-voltage lithium-ion batteries in order to decrease the decomposition of the electrolyte. As a typical high-voltage cathode material, LiCoPO 4 was tested in the LiDFOB-containing electrolyte, exhibiting higher reversible charge/discharge capacity and better cyclic stability. The effect of LiDFOB on the formation of a stable interphase film was investigated through cyclic voltammetry and X-ray photoelectron spectroscopy. LiDFOB was helpful to form a stable interphase film and passivate the cathode surface; therefore, the decomposition of the electrolyte was inhibited accordingly.

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“…1 Among them, LiCoPO 4 has recently received peculiar attention due to its high redox potential of 4.8 V (vs. Li + /Li, unless otherwise stated) and thus high energy density of 800 Wh kg −1 , which is essential for batteries to be used in compact energy storage systems. [6][7][8][9][10] Particularly, substitution of electrochemically active cations (Fe 2+ , Mn 2+ , etc.) [2][3][4][5] Various strategies have been developed to improve the electrochemical activity of LiCoPO 4 , including carbon coating, size reducing, and substitution of exotic ions.…”

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confidence: 99%

Improving Electrochemical Properties of LiCoPO4 by Mn Substitution: A Case Research on LiCo0.5Mn0.5PO4

Han

Liu

et al. 2012

ECS Electrochemistry Letters

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LiCo 0.5 Mn 0.5 PO 4 is readily prepared via a modified hydrothermal route to investigate the effect of Mn substitution on LiCoPO 4 . The results show that the Mn substitution plays a profound role in reducing the particle size and stabilizing the surface of the olivine materials, thus leading to highly improved electrochemical properties versus the pure LiCoPO 4 . The LiCo 0.5 Mn 0.5 PO 4 can deliver a reversible capacity of 126 mAh g −1 and maintain 88% of that over 30 cycles, thereby manifesting its potential for energy storage application.

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LiFePO4 modified Li1.02(Co0.9Fe0.1)0.98PO4 cathodes with improved lithium storage properties

Cited by 50 publications

References 18 publications

Olivine Positive Electrodes for Li-Ion Batteries: Status and Perspectives

Olivine Positive Electrodes for Li-Ion Batteries: Status and Perspectives

Effect of lithium difluoro(oxalate)borate (LiDFOB) additive on the performance of high-voltage lithium-ion batteries

Improving Electrochemical Properties of LiCoPO4 by Mn Substitution: A Case Research on LiCo0.5Mn0.5PO4

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