Ordered Olivine‐Type Lithium–Cobalt and Lithium–Nickel Phosphates Prepared by a New Precursor Method

Koleva, V.; Zhecheva, E.; Stoyanova, Р.

doi:10.1002/ejic.201000400

Cited by 40 publications

(18 citation statements)

References 35 publications

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“…The DSC curves indicate that these processes are endothermic and the corresponding peaks are found at 218°C and 299°C for SS, 130°C and 225°C for SG [22]. Finally, TG curve shows steep weight loss in between 310°C and 650°C for SS, 320°C and 450°C for SG.…”

Section: Resultsmentioning

confidence: 88%

Polyvinylpyrrolidone assisted sol–gel route LiCo1/3Mn1/3Ni1/3PO4 composite cathode for aqueous rechargeable battery

Kandhasamy

Pandey

Minakshi

2012

Electrochimica Acta

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Kandhasamy, S., Pandey, A. and Minakshi, M. (2012)Polyvinylpyrrolidone assisted sol-gel route LiCo1/3Mn1/3Ni1/3PO4 composite cathode for aqueous rechargeable battery. Electrochimica Acta, 60 (15 Jan This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. polymer assisted sol-gel (SG) methods, is reported as a cathode material for aqueous rechargeable batteries. X-ray diffraction (XRD) analysis confirms phase pure compounds in an orthorhombic structure for both these methods. However, microstructural images show polyvinylpyrrolidone (PVP) assisted SG method aids colloidal growth giving evenly distributed microparticles while SS method tend to an agglomeration during high-temperature processing.The electrochemical properties for SG are seen to be dramatically superior to those of SS. The galvanostatic analysis of the SG shows improved specific capacity over the initial cycles (45 mAh/g and 60 mAh/g for the 1 st and 20 th cycles) and stabilized upon cycling. This unique capability is due to the trapped organic products from the thermal decomposition of PVP that facilitates Li + transfer. The trapped organic coating on the cathode surface without affecting the bulk olivine is evidenced by XRD, FTIR and XPS spectroscopic techniques.

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Section: Resultsmentioning

confidence: 88%

Polyvinylpyrrolidone assisted sol–gel route LiCo1/3Mn1/3Ni1/3PO4 composite cathode for aqueous rechargeable battery

Kandhasamy

Pandey

Minakshi

2012

Electrochimica Acta

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“…galvanostatically at a constant current of 0.2 mA (on mass density 8 mA/g) using an 8 channel battery analyzer from MTI Corp., USA, operated by a battery testing system (BTS). extending up to 405°C may be ascribed to the decomposition of CA benzene ring (six carbon atoms) and the formation of the olivine compound, which is displayed by the predominant exothermic peak observed [13,16] in the DSC profile around 400 o C. Small endothermic peak in the region 150 to 250°C for all samples is attributed to the release of physically adsorbed water from the precursor mix and ammonia as by-product [17]. The CA and PVP samples show only the exothermic peaks, whereas TEA sample shows two endothermic peaks at 350°C and 425°C.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Olivine-type cathode for rechargeable batteries: Role of chelating agents

Kandhasamy

Singh

Thurgate

et al. 2012

Electrochimica Acta

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractOlivine (LiCo 1/3 Mn 1/3 Ni 1/3 PO 4 ) powders were synthesised at 550 -600 °C for 6 h in air by a sol-gel method using multiple chelating agents and used as a cathode material for rechargeable batteries. Range of chelating agents like a weak organic acid (Citric acid -CA), emulsifier (Triethanolamine -TEA) and non-ionic surfactant (Polyvinylpyrrolidone -PVP) in sol-gel wet chemical synthesis were used. The dependence of the physicochemical properties of the olivine powders such as particle size, morphology, structural bonding and crystallinity on the chelating agent was extensively investigated. Among the chelating agents used, unique cycling behavior (75 mAh/g after 25 cycles) is observed for the PVP assisted olivine. This is due to volumetric change in trapped organic layer for first few cycles. The trapped organic species in the electrode -electrolyte interface enhances the rate of lithium ion diffusion with better capacity retention. In contrast, CA and TEA showed a gradual capacity fade of 30 and 38 mAh/g respectively after multiple cycles. The combination of all the three mixed chelating agents showed an excellent electrochemical behavior of 100 mAh/g after multiple cycles and the synergistic effect of these agents are discussed.

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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: 95%

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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Ordered Olivine‐Type Lithium–Cobalt and Lithium–Nickel Phosphates Prepared by a New Precursor Method

Cited by 40 publications

References 35 publications

Polyvinylpyrrolidone assisted sol–gel route LiCo1/3Mn1/3Ni1/3PO4 composite cathode for aqueous rechargeable battery

Polyvinylpyrrolidone assisted sol–gel route LiCo1/3Mn1/3Ni1/3PO4 composite cathode for aqueous rechargeable battery

Olivine-type cathode for rechargeable batteries: Role of chelating agents

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

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