Protective organic additives for high voltage LiNi0.5Mn1.5O4 cathode materials

Bae, Seo-Youn; Shin, Won-Kyung; Kim, Dong-Won

doi:10.1016/j.electacta.2014.01.124

Cited by 41 publications

(24 citation statements)

References 34 publications

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“…Among them, LiNi 0.5 Mn 1.5 O 4 has been recognized as the ideal high-voltage material due to the abundant nickel and manganese resources, eco-friendliness, low-cost, etc. [8,9,10]. As a result, LiNi 0.5 Mn 1.5 O 4 has attracted much attention from academics and enterprises.…”

Section: Introductionmentioning

confidence: 99%

Er-Doped LiNi0.5Mn1.5O4 Cathode Material with Enhanced Cycling Stability for Lithium-Ion Batteries

et al. 2017

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The Er-doped LiNi0.5Mn1.5O4 (LiNi0.495Mn1.495Er0.01O4) sample was successfully prepared by citric acid-assisted sol-gel method with erbium oxide as an erbium source for the first time. Compared with the undoped sample, the Er-doped LiNi0.5Mn1.5O4 sample maintained the basic spinel structure, suggesting that the substitution of Er3+ ions for partial nickel and manganese ions did not change the intrinsic structure of LiNi0.5Mn1.5O4. Moreover, the Er-doped LiNi0.5Mn1.5O4 sample showed better size distribution and regular octahedral morphology. Electrochemical measurements indicated that the Er-doping could have a positive impact on the electrochemical properties. When cycled at 0.5 C, the Er-doped LiNi0.5Mn1.5O4 sample exhibited an initial discharge capacity of 120.6 mAh·g−1, and the capacity retention of this sample reached up to 92.9% after 100 cycles. As the charge/discharge rate restored from 2.0 C to 0.2 C, the discharge capacity of this sample still exhibited 123.7 mAh·g−1 with excellent recovery rate. Since the bonding energy of Er-O (615 kJ·mol−1) was higher than that of Mn-O (402 kJ·mol −1) and Ni-O (392 kJ·mol−1), these outstanding performance could be attributed to the increased structure stability as well as the reduced aggregation behavior and small charge transfer resistance of the Er-doped LiNi0.5Mn1.5O4.

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Section: Introductionmentioning

confidence: 99%

Er-Doped LiNi0.5Mn1.5O4 Cathode Material with Enhanced Cycling Stability for Lithium-Ion Batteries

et al. 2017

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“…5 15 Incorporating additives in conventional ethylene carbonate (EC)-based electrolyte and other novel electrolyte systems has been widely investigated to improve the electrochemical performance of high voltage cells where LiNi 0.5 Mn 1.5 O 2 was used. [16][17][18][19][20][21][22][23][24][25][26][27] A similar approach was employed to improve NMC442/graphite cell performance at high voltage as well. [28][29][30][31][32][33][34][35][36][37][38][39] For example, pyridine boron trifluoride (PBF), [28][29][30] triallyl phosphate (TAP), 31 and a blend of additives containing prop-1-ene-1,3-sultone (PES), 1,3,2-dioxathiolane-2,2-dioxide (DTD) + tris-(trimethyl-silyl) phosphite (TTSPi) [32][33][34][35][36] have been used to improve high voltage performance of NMC442/graphite cells to some extent.…”

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confidence: 99%

Studies of Gas Generation, Gas Consumption and Impedance Growth in Li-Ion Cells with Carbonate or Fluorinated Electrolytes Using the Pouch Bag Method

Xiong

Ellis

Petibon

et al. 2016

J. Electrochem. Soc.

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Li [Ni 0.42 Mn 0.42 Co 0.16 ]O 2 (NMC442)/graphite pouch cells with an ethylene carbonate-containing or a fluorinated electrolyte were used to prepare charged electrodes for studies using "pouch bags". Sealed pouch bags containing either lithiated graphite or delithiated NMC442 electrodes taken from pouch cells, and also "sister" pouch cells, were subjected to 500 h storage at elevated temperature. The electrodes recovered from the pouch bags and pouch cells after storage were studied using electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy while the gases generated were quantified using gas chromatography. The fluorinated electrolyte suppressed impedance growth of the positive electrode during storage but caused a large initial negative electrode impedance compared to the carbonate electrolyte. The solid electrolyte interface (SEI) formed by the fluorinated electrolyte at the graphite electrode hinders the consumption of CO 2 generated at the delithiated NMC442 electrode, leading to more CO 2 in pouch cells with fluorinated electrolyte than in cells with carbonate electrolyte. Hydrogen gas was only observed in pouch cells after storage and not in pouch bags which contained either a single negative electrode plus electrolyte or a single positive electrode plus electrolyte, suggesting the H 2 results from a species created at one electrode which reacts at the other in a pouch cell. , one of the layered NMC series, has attracted attention due to its high working potential, high specific capacity and excellent safety. 11-14This material can be operated to up to 4.7 V without any substantial structural change.11,12 Its discharge specific capacity increases almost linearly with the upper cutoff potential from 4.1 V to 4.7 V. At 4.7 V, a reversible specific capacity of ∼207 mAh/g can be obtained from this material. In addition. NMC442 shows higher onset temperatures for exothermic reactions with electrolyte compared to other NMC materials such as LiNi 0. 16-27 A similar approach was employed to improve NMC442/graphite cell performance at high voltage as well.28-39 For example, pyridine boron trifluoride (PBF), [28][29][30] triallyl phosphate (TAP), 31 and a blend of additives containing prop-1-ene-1,3-sultone (PES), 1,3,2-dioxathiolane-2,2-dioxide (DTD) + tris-(trimethyl-silyl) phosphite (TTSPi) [32][33][34][35][36] have been used to improve high voltage performance of NMC442/graphite cells to some extent. Sulfone-based electrolytes can improve high voltage performance of NMC442/graphite cells as well. 38 Compared to the options of additives in conventional EC-based electrolyte and sulfone-based electrolyte, fluorinated electrolytes may be the best option for improving NMC442/graphite cell cycle life when cells are operated to 4.5 V and above.39 This is because the cell impedance can be controlled when fluorinated electrolytes are used while it increases dramatically with carbonate solvents operated above 4.5 V.Recently, a pouch cell and pouch bag method has been put forward to study the inte...

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“…Besides LiBOB, other additives have been reported to protect the high voltage cathode and mitigate electrolyte decomposition, including LiDFOB [162], succinic anhydride [66,122], 1,3-propane sultone [66], tris(hexafluoro-iso-propyl) phosphate [127], tris(pentafluorophenyl) phosphine [156], 3-hexylthiophene [3], 1,3-propanediolcyclic sulfate [41], dimethylacetamide [13], triethyl(2-methoxyethyl) phosphonium bis(trifluoromethylsulfonyl)imide [13], glutaric anhydride [16], 4-(trifluoromethyl)-benzonitrile [55], and 1-propylphosphonic acid cyclic anhydride [160]. The structures of the additives that are not listed in the previous text are shown in Fig.…”

Section: Additives For High-voltage Cathode Materialsmentioning

confidence: 99%