High power and high capacity cathode material LiNi0.5Mn0.5O2 for advanced lithium-ion batteries

Meng, Xianglong; Dou, Shumei; Wang, Wen-lou

doi:10.1016/j.jpowsour.2008.04.015

Cited by 54 publications

(25 citation statements)

References 25 publications

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“…The changes in layer occupancy have a direct effect on the X-ray intensity ratios such as I 003 /I 104 and I (006, 102) /I 101 ratios, which are considered to be indicators of the ordering of lithium and other transition metal (Ni and/or Mn) [2,3]. When the integrated intensity ratio of I 003 /I 104 peaks was below than unity, either the (108) and (110) peaks or (006) and (102) peaks, become difficult to distinguish from each other, and this is an indicator of poor electrochemical reactivity due to high concentration of inactive rock-salt domains in a layered solid matrix.…”

Section: Resultsmentioning

confidence: 99%

“…One of the key and urgent challenges facing the advancement of rechargeable lithium batteries is the need to replace LiCoO 2 based positive electrodes with lithium intercalation compounds that are cheaper, less toxic, safer, and can store more charge (lithium) on charge/discharge cycling. Recently, another layered compound, LiNi 0.5 Mn 0.5 O 2 , which was first proposed by Ohzuku and Makimura [1], has been extensively studied as one of promising alternative cathode materials for lithium-ion batteries [2][3][4][5][6][7][8][9] because it has high capacity and a stable structure [6]. It has also been found that LiNi 0.5 Mn 0.5 O 2 crystallize with the rhombohedral α-NaFeO 2 (O3-type) crystal structure with a space group of R3m, which is made up of Li and M cations occupying the octahedral sites of a ccp array of oxide ions in alternate layers.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, with the development of high-power consuming electric devices, a lot of efforts have been paid on the modification of LiNi 0.5 Mn 0.5 O 2 so as to further improve its performance during cycling at high rate, such as coating [11] and doping with other guest ions [3,[12][13][14][15][16][17][18][19]. Surface modification by carbon is one of feasible methods due to the following reasons.…”

Section: Introductionmentioning

confidence: 99%

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Effect of carbon coating process on the structure and electrochemical performance of LiNi0.5Mn0.5O2 used as cathode in Li-ion batteries

Hashem

Abdel-Ghany

Nikolowski

et al. 2009

Ionics

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LiNi 0.5 Mn 0.5 O 2 powder was synthesized by a coprecipitation method. LiOH.H 2 O and coprecipitated [(Ni 0.5 Mn 0.5 )C 2 O 4 ] precursors were mixed carefully together and then calcined at 900°C. Surface modified cathode materials were obtained by coating LiNi 0.5 Mn 0.5 O 2 with a thin layer of amorphous carbon using table sugar and starch as carbon source. Both parent and carbon-coated samples have the characteristic layered structure of LiNi 0.5 Mn 0.5 O 2 as estimated from X-ray diffractometry measurements. Transmission electron microscope showed the presence of C layer around the prepared particles. TGA analysis emphasized and confirmed the presence of C coating around LiNi 0.5 Mn 0.5 O 2 . It is obvious that the carbon coating appears to be beneficial for the electrochemical performance of the LiNi 0.5 Mn 0.5 O 2 . A capacity of about 150 mAh/g is delivered in the voltage range 2.5-4.5 V at current density C/15 for carbon coated LiNi 0.5 Mn 0.5 O 2 in comparison with about 165 mAh/g obtained for carbon free LiNi 0.5 Mn 0.5 O 2 at the same current density and voltage window. About 92% and 82% capacity retention was obtained at 50th cycle for coated LiNi 0.5 Mn 0.5 O 2 using sucrose and starch, respectively; whereas, 75% was retained after only 30th cycle for carbon free LiNi 0.5 Mn 0.5 O 2 . This improvement is mainly attributed to the presence of thin layer of carbon layer that encapsulate the nanoparticles and improve the conductivity and the electrochemical performance of LiNi 0.5 Mn 0.5 O 2 .

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of carbon coating process on the structure and electrochemical performance of LiNi0.5Mn0.5O2 used as cathode in Li-ion batteries

Hashem

Abdel-Ghany

Nikolowski

et al. 2009

Ionics

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show abstract

“…In recent years, much attention has been paid to a layered Li [Ni 0.5 Mn 0.5 ]O 2 that can be considered as a one-to-one mixture of LiNiO 2 and LiMnO 2 [1][2][3]. It has many advantages over LiNiO 2 and LiMnO 2 , such as high capacity, structural and thermal stability, and excellent cyclic performance.…”

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, Ni-rich LiNi 2/3 Mn 1/3 O 2 may encounter a misorder between Li + and Ni 2+ ions in the structure and dissolution of Mn ions in the electrolyte, leading to a low capacity and a poor cyclability. In this work, we developed a common co-precipitation route to LiNi 2/3 Mn 1/3 O 2 cathode materials [11][12][13]. The amount of lithium source in the starting materials was systematically adjusted to achieve a high-ordered structure.…”

mentioning

confidence: 99%

Synthesis and modification of well-ordered layered cathode oxide LiNi2/3Mn1/3O2

et al. 2010

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Oxalic-acid-based co-precipitation method was employed to prepare LiNi 2/3 Mn 1/3 O 2 sample with a high-ordered structure. Li + , Ni 2+ and Mn 2+ acetates were used as starting materials. The influence of the amount of lithium source in the starting materials on Li + content, disorder of Li + -Ni 2+ ions, and electrochemical performance has been investigated. Rietveld refinement shows that the sample prepared with 20% excess Li-source in the starting materials exhibits a perfect ordered structure. A specific discharge capacity is as high as 172 mAh/g at C/20 in the voltage range of 4.35−2.7 V. However, the cyclability is not satisfactory: about 25.3% fade in capacity was observed over 50 cycles.

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High power and high capacity cathode material LiNi0.5Mn0.5O2 for advanced lithium-ion batteries

Cited by 54 publications

References 25 publications

Effect of carbon coating process on the structure and electrochemical performance of LiNi0.5Mn0.5O2 used as cathode in Li-ion batteries

Effect of carbon coating process on the structure and electrochemical performance of LiNi0.5Mn0.5O2 used as cathode in Li-ion batteries

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

Synthesis and modification of well-ordered layered cathode oxide LiNi2/3Mn1/3O2

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