Comparative study of solid-state redox reactions of LiCo1/4Ni3/4O2 and LiAl1/4Ni3/4O2 for lithium-ion batteries

Ohzuku, Tsutomu; Nakura, Kensuke; Aoki, Toshiyuki

doi:10.1016/s0013-4686(99)00200-5

Cited by 58 publications

(29 citation statements)

References 10 publications

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“…The shift is greatest for the Al-substituted material ͑ϳ50 mV͒ and has been predicted by ab initio calculations. 23,[38][39][40] In general, the increase in discharge peak potential is less pronounced than for charge, with all of the substituted materials delivering peak capacity near 3.77 V compared to 3.75 V for the unsubstituted analog. The increase in charge potential explains the lower-than-expected practical capacities obtained for several of the substituted materials using a 4.3 V cutoff.…”

Section: Resultsmentioning

confidence: 99%

Structure and Electrochemistry of LiNi[sub 1∕3]Co[sub 1∕3−y]M[sub y]Mn[sub 1∕3]O[sub 2] (M=Ti, Al, Fe) Positive Electrode Materials

Wilcox

Patoux

Doeff

2009

J. Electrochem. Soc.

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A series of materials based on the LiNi 1/3 Co 1/3−y M y Mn 1/3 O 2 ͑M = Ti,Al,Fe͒ system has been synthesized and examined structurally and electrochemically. It is found that the changes in electrochemical performance depend highly on the nature of the substituting atom and its effect on the crystal structure. Substitution with small amounts of Ti 4+ ͑y = 1/12͒ leads to the formation of a high-capacity and high-rate positive electrode material. Iron substituted materials suffer from an increased antisite defect concentration and exhibit lower capacities and poor rate capabilities. Single-phase materials are found for LiNi 1/3 Co 1/3−y Al y Mn 1/3 O 2 when y ഛ 1/4 and all exhibit decreased capacities when cycled to 4.3 V. However, an increase in rate performance and cycle stability upon aluminum substitution is correlated with an improved lamellar structure.

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Section: Resultsmentioning

confidence: 99%

Structure and Electrochemistry of LiNi[sub 1∕3]Co[sub 1∕3−y]M[sub y]Mn[sub 1∕3]O[sub 2] (M=Ti, Al, Fe) Positive Electrode Materials

Wilcox

Patoux

Doeff

2009

J. Electrochem. Soc.

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“…The lattice constants (a, c and V Þ increase with the calcination temperature, which is consistent with the elemental crystal growth theory. 40 Among these materials, all c/a values are greater than 4.899, suggesting the well-developed layered structures. 41,42 Comparing with sg700, sg800 and sg900, ss800 has the smallest c/a value, implying its poorest crystallinity.…”

Section: Resultsmentioning

confidence: 95%

FACILE SOL–GEL SYNTHESIS OF Li[Li_0.2Mn_0.56Ni_0.16Co_0.08]O₂ AS IMPROVED CATHODE MATERIAL FOR LITHIUM-ION BATTERIES

Hao

Chen

Wang

et al. 2013

J. Mol. Eng. Mater.

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Li[Li 0:2 Mn 0:56 Ni 0:16 Co 0:08 ]O 2 cathode materials for Li-ion batteries were synthesized by a facile sol-gel method followed by calcination at various temperatures (700 C, 800 C and 900 C). Lithium acetate dihydrate, manganese (II) acetate tetrahydrate, nickel (II) acetate tetrahydrate and cobalt (II) acetate tetrahydrate are employed as the metal precursors, and citric acid monohydrate as the chelating agent. For the obtained Li[Li 0:2 Mn 0:56 Ni 0:16 Co 0:08 ]O 2 materials, the metal components existed in the form of Mn 4þ , Ni 2þ and Co 3þ , and their molar ratio was in good agreement with 0.56 : 0.16 : 0.08. The calcination temperature played an important role in the particle size, crystallinity and further electrochemical properties of the cathode materials. The Li[Li 0:2 Mn 0:56 Ni 0:16 Co 0:08 ]O 2 material calcined at 800 C for 6 h showed the best electrochemical performances. Its discharge speci¯c capacities cycled at 0.1 C, 0.5 C, 1 C and 2 C rates were 266.0 mAh g À1 , 243.1 mAh g À1 , 218.2 mAh g À1 and 192.9 mAh g À1 , respectively. When recovered to 0.1 C rate, the discharge speci¯c capacity was 260.2 mAh g À1 and the capacity loss is only 2.2%. This work demonstrates that the sol-gel method is a facile route to prepare high performance Li[Li 0:2 Mn 0:56 Ni 0:16 Co 0:08 ]O 2 cathode materials for Li-ion batteries.

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“…As discussed by Kang et al [16], the increased c-lattice parameter for the layered material induces an expanded Li slab space, which will be beneficial to the faster Li motion. The c/a ratio is an indicator of the cation ordering in the layered structure [17]. The larger the ratio, the lesser the cation disorder is.…”

Section: Structure Characterizationmentioning

confidence: 99%

Properties of LiNi1/3Co1/3Mn1/3O2 cathode material synthesized by a modified Pechini method for high-power lithium-ion batteries

Xia

Wang

Xiao

et al. 2009

Journal of Alloys and Compounds

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Comparative study of solid-state redox reactions of LiCo1/4Ni3/4O2 and LiAl1/4Ni3/4O2 for lithium-ion batteries

Cited by 58 publications

References 10 publications

Structure and Electrochemistry of LiNi[sub 1∕3]Co[sub 1∕3−y]M[sub y]Mn[sub 1∕3]O[sub 2] (M=Ti, Al, Fe) Positive Electrode Materials

Structure and Electrochemistry of LiNi[sub 1∕3]Co[sub 1∕3−y]M[sub y]Mn[sub 1∕3]O[sub 2] (M=Ti, Al, Fe) Positive Electrode Materials

FACILE SOL–GEL SYNTHESIS OF Li[Li_0.2Mn_0.56Ni_0.16Co_0.08]O₂ AS IMPROVED CATHODE MATERIAL FOR LITHIUM-ION BATTERIES

Properties of LiNi1/3Co1/3Mn1/3O2 cathode material synthesized by a modified Pechini method for high-power lithium-ion batteries

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Comparative study of solid-state redox reactions of LiCo1/4Ni3/4O2 and LiAl1/4Ni3/4O2 for lithium-ion batteries

Cited by 58 publications

References 10 publications

Structure and Electrochemistry of LiNi[sub 1∕3]Co[sub 1∕3−y]M[sub y]Mn[sub 1∕3]O[sub 2] (M=Ti, Al, Fe) Positive Electrode Materials

Structure and Electrochemistry of LiNi[sub 1∕3]Co[sub 1∕3−y]M[sub y]Mn[sub 1∕3]O[sub 2] (M=Ti, Al, Fe) Positive Electrode Materials

FACILE SOL–GEL SYNTHESIS OF Li[Li0.2Mn0.56Ni0.16Co0.08]O2 AS IMPROVED CATHODE MATERIAL FOR LITHIUM-ION BATTERIES

Properties of LiNi1/3Co1/3Mn1/3O2 cathode material synthesized by a modified Pechini method for high-power lithium-ion batteries

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FACILE SOL–GEL SYNTHESIS OF Li[Li_0.2Mn_0.56Ni_0.16Co_0.08]O₂ AS IMPROVED CATHODE MATERIAL FOR LITHIUM-ION BATTERIES