Influence of Li source on tap density and high rate cycling performance of spherical Li[Ni1/3Co1/3Mn1/3]O2 for advanced lithium-ion batteries

Pure, single-phase and layered LiCo 1− Ni O 2 materials with good cation ordering are not easy to synthesize. In this work, solid solutions of LiCo 1− Ni O 2 (x = 0, 0.1, . . ., 0.9) are synthesized using a self-propagating combustion route and characterized. All the materials are observed to be phase pure giving materials of hexagonal crystal system with R-3m space group. The RIR and R factor values of stoichiometries of LiCo 1− Ni O 2 (x = 0.1, 0.2, 0.3, 0.4, and 0.5) show good cation ordering. Their electrochemical properties are investigated by a series of charge-discharge cycling in the voltage range of 3.0 to 4.3 V. It is found that some of the stoichiometries exhibit specific capacities comparable or better than those of LiCoO 2 , but the voltage plateau is slightly more slopping than that for the LiCoO 2 reference material.

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“…and they are taken as a measure of the cation ordering of the materials [17,21]. A high RIR of 1.2 and above indicates good cation ordering [21].…”

Section: Resultsmentioning

confidence: 99%

“…A high RIR of 1.2 and above indicates good cation ordering [21]. As for the factor, values of less than 1.0 indicate good cation ordering [18,22].…”

Section: Resultsmentioning

confidence: 99%

Solid Solutions ofLiCo1−xNixO2(x<

Elong

Kamarulzaman

Rusdi

et al. 2013

ISRN Condensed Matter Physics

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“…In our previous work [12,13], continuous carbonate coprecipitation method has been proven to be a good choice of for the preparation of [Ni 1/3 Co 1/3 Mn 1/3 ]CO 3 as the precursor of LiNi 1/3 Co 1/3 Mn 1/3 O 2 cathode material with excellent performance. In this paper, both the continuous carbonate coprecipitation (CCC method) and continuous hydroxide coprecipitation (CHC method) have been adopted to prepare the spherical Li [Ni 0.5 …”

Section: Introductionmentioning

confidence: 99%

Influence of preparation method on structure, morphology, and electrochemical performance of spherical Li[Ni0.5Mn0.3Co0.2]O2

Yang

Wang

Yang

et al. 2012

J Solid State Electrochem

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Spherical Li[Ni 0.5 Mn 0.3 Co 0.2 ]O 2 was prepared by both the continuous hydroxide co-precipitation method and continuous carbonate co-precipitation method under different calcined temperatures. The physical properties and electrochemical behaviors of Li[Ni 0.5 Mn 0.3 Co 0.2 ]O 2 prepared by two methods were characterized by X-ray diffraction, scanning electron microscope, and electrochemical measurements. It has been found that different preparation methods will result in the differences in the morphology (shape, particle size, and tap density), structure stability, and the electrochemical characteristics (shape of initial charge/discharge curve, cycle stability, and rate capability) of the final product Li [Ni 0.5 Mn 0.3 Co 0.2 ]O 2 . The physical and electrochemical properties of the spherical Li[Ni 0.5 Mn 0.3 Co 0.2 ]O 2 prepared by continuous hydroxide co-precipitation is apparently superior to the one prepared by continuous carbonate co-precipitation method. The optimal sample prepared by continuous hydroxide co-precipitation at 820°C exhibits a hexagonally ordered layer structure, high special discharge capacity, good capacity retention, and excellent rate capability. It delivers high initial discharge capacity of 175.2 mAh g −1 at 0.2 C rate between 3.0 and 4.3 V, and the capacity retention of 98.8 % can be maintained after 50 cycles. While the voltage range is broadened up to 2.5 and 4.6 V vs. Li + /Li, the special discharge capacities at 0.2 C, 0.5 C, 1 C, 2 C, 5 C, and 10 C rates are as high as 214. 3, 205.0, 198.3, 183.3, 160.1 and 135.2 mAh g −1 , respectively.

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“…Therefore, high-performing materials could be obtained by preparing LiNi 1/3 Co 1/3 Mn 1/3 O 2 crystal with a high percentage of exposed {010} facets. Various synthetic methods have been employed to the preparation of LiNi 1/3 Mn 1/3 Co 1/3 O 2 such as solidstate reaction method [10], coprecipitation method [11], solegel method [12], and liquid-phase method [13,14], and other synthetic routes [15e17]. As the crystal growth rate of {001} facets of LiNi 1/ 3 Mn 1/3 Co 1/3 O 2 crystal is faster than that of {010} facets with high surface energy, {010} facets have a tendency to disappear during growth, and the surface of the resulting crystal will be dominated by {001} facets.…”

Section: Introductionmentioning

confidence: 99%