Electrical conductivity and 6,7Li NMR studies of Li1 + yCoO2

Carewska, Maria; Scaccia, Silvera; Croce, F.; Sudalai, Arumugam; Wang, Y.; Greenbaum, Steven

doi:10.1016/s0167-2738(96)00545-0

Cited by 86 publications

(58 citation statements)

References 7 publications

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“…Moreover, when the RIR is below 1.2, either the (006)/(102) peaks or the (108)/(110) peaks become difficult to distinguish from each other. As shown in Table I, all of 26,27 Similar phenomena were observed in this study, although a different synthesis process based on an aqueous solution of lithium nitrate (LiNO 3 ) as an excess lithium precursor was applied to prepare the over-stoichiometric Li 1+x CoO 2 powders.…”

Section: Resultssupporting

confidence: 74%

Electrochemical Properties of Li_1+xCoO₂Synthesized for All-Solid-State Lithium Ion Batteries with Li₂S-P₂S₅Glass-Ceramics Electrolyte

Kim

Park

et al. 2015

J. Electrochem. Soc.

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The over-stoichiometric Li 1+x CoO 2 (x = 0.1, 0.2, and 0.3) cathode materials were synthesized from an aqueous solution of lithium nitrate (LiNO 3 ) as an excess lithium precursor and their effects on the electrochemical properties of all-solid-state lithium batteries employing Li 2 S-P 2 S 5 glass-ceramics solid electrolytes are investigated. A combination of X-ray diffraction, Fourier transform infrared spectroscopy, and inductively coupled plasma atomic emission spectroscopy reveals that the excess lithium forms a residual Li 2 CO 3 layer on the surface of as-prepared Li 1+x CoO 2 particles during the synthesis process. While regarded as an impurity phase in lithium battery systems using liquid electrolytes due to its detrimental effects on electrochemical performance, the Li 2 CO 3 formed on the surface of the over-stoichiometric Li 1+x CoO 2 powders is identified in all-solid-state lithium battery systems using sulfide solid electrolytes to act as an effective coating material to suppress the interfacial side reactions despite its low ionic and electronic conductivity. All-solid-state lithium ion batteries (ASS-LIBs) including inorganic solid electrolytes are consistently at the center of attention in the discussion on safety issues arising from the flammability of liquid electrolytes in conventional LIBs. ASS-LIB technology has come a long way in the last few decades through the development of oxide and sulfide solid electrolytes with practical levels of high ionic conductivities comparable to organic liquid electrolytes.1-4 Therefore, the rate determining step is now no longer Li + ion migration in the solid electrolyte and overall cell resistance is determined mainly at the interface between the cathode active material and solid electrolyte. However, ASS-LIBs employing oxide and sulfide solid electrolytes have some crucial interfacial problems resulting in low reversible capacity and capacity fade for practical applications, due to limited contact area and undesirable interfacial side reactions between the cathode active material and the oxide/sulfide solid electrolyte. 5,6 Many studies are in progress to understand and resolve the interfacial side reaction problem responsible for this capacity loss in order to develop ASS-LIBs with high energy density and long cycle life required for electric vehicles. Several researchers have suggested that the origin of the interfacial degradation is mutual diffusion of chemical species between solid electrolyte and cathode, 5,7 or the formation of a space-charge layer. 8,9 When garnet-structured Li 7 La 3 Zr 2 O 12 (LLZ) is contacted with LiCoO 2 , mutual diffusion of Co and La, Zr occurs at the interface during a thermal treatment to improve adhesion between the cathode material and the oxide solid electrolyte.10 Problems regarding this mutual diffusion of Co and S have been also reported in ASS-LIBs with Li 2 S-P 2 S 5 solid electrolytes, especially during initial charging process. At present, the fundamental mechanism is not clear, but interfacial control via sur...

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Section: Resultssupporting

confidence: 74%

Electrochemical Properties of Li_1+xCoO₂Synthesized for All-Solid-State Lithium Ion Batteries with Li₂S-P₂S₅Glass-Ceramics Electrolyte

Kim

Park

et al. 2015

J. Electrochem. Soc.

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“…showed that the electronic conductivity of LiCoO 2 can be improved by Mg-doping [14,[16][17][18][19][20][21][22]. In this project, Li(Mg x Co 1-x )O 2 (x = 0, x = 0.03 , x = 0.05) compounds were prepared by the molten salt method (LiNO 3 :LiCl eutectic as the molten salt) at 800 °C, and their cathodic performance was studied in a voltage range of 2.5-4.3V at current rate of 30 mAg -1 for up to 60 charge-discharge cycles.…”

Section: Introductionmentioning

confidence: 99%

Studies on Bare and Mg-doped LiCoO2 as a cathode material for Lithium ion Batteries

Reddy

Jie

Jafta

et al. 2014

Electrochimica Acta

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In this paper, we report on the preparation of bare and Mg-doped Li(Mg x Co 1-x )O 2 (x = 0, 0.03, 0.05) phases by a molten salt method and their electrochemical properties. They were prepared at 800 °C for 6 h in air. Rietveld refined X-Ray Diffraction data of bare (x = 0) and charge capacity values at the 60 th cycle to be: 147 (±3) mAh g -1 (x = 0), 127 (±3) mAh g -1 (x = 0.03), and 131 (±3) mAh g -1 (x=0.05) cycled at a current density of 30 mA g -1 . Capacity retention is also favourable at 98.5 %.

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“…The measurements of the electrical conductivity as a function of oxygen partial pressure [29] indicate that the model represented by eq. (14) is -1 valid.…”

Section: [V~o]+[vl~i] = [H'] (13)mentioning

confidence: 93%

“…E An alternative defect model [29] assumes that the pre~o dominant point defects in LiCoO2 are cobalt vacancies and ~ = -2 i electron holes while the concentration of lithium vacan_o cies is negligibly low. In this case the defect disorder model is the same as that for CoO.…”

Section: [V~o]+[vl~i] = [H'] (13)mentioning

confidence: 99%

Properties of the electrode material LixCoO2

Бак

Nowotny

Rękas

et al. 2000

Ionics

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Electrical conductivity and 6,7Li NMR studies of Li1 + yCoO2

Cited by 86 publications

References 7 publications

Electrochemical Properties of Li_1+xCoO₂Synthesized for All-Solid-State Lithium Ion Batteries with Li₂S-P₂S₅Glass-Ceramics Electrolyte

Electrochemical Properties of Li_1+xCoO₂Synthesized for All-Solid-State Lithium Ion Batteries with Li₂S-P₂S₅Glass-Ceramics Electrolyte

Studies on Bare and Mg-doped LiCoO2 as a cathode material for Lithium ion Batteries

Properties of the electrode material LixCoO2

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Electrical conductivity and 6,7Li NMR studies of Li1 + yCoO2

Cited by 86 publications

References 7 publications

Electrochemical Properties of Li1+xCoO2Synthesized for All-Solid-State Lithium Ion Batteries with Li2S-P2S5Glass-Ceramics Electrolyte

Electrochemical Properties of Li1+xCoO2Synthesized for All-Solid-State Lithium Ion Batteries with Li2S-P2S5Glass-Ceramics Electrolyte

Studies on Bare and Mg-doped LiCoO2 as a cathode material for Lithium ion Batteries

Properties of the electrode material LixCoO2

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Electrochemical Properties of Li_1+xCoO₂Synthesized for All-Solid-State Lithium Ion Batteries with Li₂S-P₂S₅Glass-Ceramics Electrolyte

Electrochemical Properties of Li_1+xCoO₂Synthesized for All-Solid-State Lithium Ion Batteries with Li₂S-P₂S₅Glass-Ceramics Electrolyte