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

Hashem, Ahmed M.; Abdel-Ghany, Ashraf E.; Nikolowski, Kristian; Ehrenberg, Helmut

doi:10.1007/s11581-009-0403-8

Cited by 20 publications

(17 citation statements)

References 25 publications

(26 reference statements)

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“…[22][23][24][25][26][27][28] However, studies of carbon additives at high potential (>4.6 V) are limited and typically have been investigated in the presence of active materials. 13,14,22,29 Herein, a systematic investigation of the stability of the inactive components of the cathode laminate and aluminum current collector of lithium ion battery at different storage potentials in the presence of LiPF 6 EC-based electrolyte is reported. Cathodes were prepared without active materials to investigate the role of the inactive components in performance loss at high potential over a week to probe long term oxidative stability.…”

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confidence: 99%

“…While much effort has been expended on the development and investigation of active cathode materials, less attention has been given to the inactive components of the positive electrode. 13,14 The aluminum current collector is stable in LiPF 6 or LiBF 4 based electrolyte due to the formation of a passivation film at standard potential ranges (up to 4.3 V). [15][16][17][18] However, corrosion of aluminum is observed in this same potential range for other electrolyte salts.…”

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Stability of Inactive Components of Cathode Laminates for Lithium Ion Batteries at High Potential

Chen

Nguyen

et al. 2014

J. Electrochem. Soc.

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The stability of inactive components in LIB (lithium ion batteries) electrodes upon exposure to high potentials can affect cell performance. A series of Li/ inactive component cells with aluminum, conductive carbon, and graphite as the inactive component were prepared and stored at high potential for one week. Electrochemical measurements and ex-situ surface analysis, including TEM (transmission electron microscopy), XPS (X-ray photoelectron spectroscopy), and FTIR (Fourier transform infrared spectroscopy), were conducted to investigate the stability of inactive components in the presence of LiPF 6 in 3:7 ethylene carbonate (EC) and ethyl methyl carbonate (EMC) electrolyte at different potentials. The results show that all components are stable upon storage at 4.3 V. Storage at 4.6 or 4.9 V results in no aluminum corrosion, but limited decomposition on conductive carbon and greater decomposition on graphite. Storage at 5.3 V results in significant electrolyte oxidation to generate poly(ethylene carbonate) on the surface of all inactive electrodes and aluminum corrosion.Lithium ion batteries (LIBs) have had great success for portable electronics applications since their initial commercialization in the 1990s. 1-3 However, the development of LIB for hybrid electric vehicles (HEVs) and electric vehicles (EVs), requires LIBs with higher energy and power density. Significant research has been conducted on the development of novel cathode active materials with a higher operating potential (> 4.5 V vs Li/Li + ) or higher capacity, such as high voltage spinel LiNi 0.5 Mn 1.5 O 4 and lithium magnesium rich NMC. [4][5][6][7][8][9][10][11] However, there are significant concerns regarding the stability of standard carbonate based electrolytes, LiPF 6 in a mixture of ethylene carbonate (EC) and dialkyl carbonates, at higher potential. 12 The cathode laminate of a typical lithium ion battery includes the active materials along with inactive components, such as carbonaceous materials (usually graphite or conductive carbon) to enhance the conductivity, polymeric binder (typically PVDF), and an aluminum current collector. While much effort has been expended on the development and investigation of active cathode materials, less attention has been given to the inactive components of the positive electrode. 13,14 The aluminum current collector is stable in LiPF 6 or LiBF 4 based electrolyte due to the formation of a passivation film at standard potential ranges (up to 4.3 V). 15-18 However, corrosion of aluminum is observed in this same potential range for other electrolyte salts. [19][20][21] Many different types of carbon additives have been utilized in cathode laminates and differences in the physical properties such as surface area and porosity affect stability and performance. [22][23][24][25][26][27][28] However, studies of carbon additives at high potential (>4.6 V) are limited and typically have been investigated in the presence of active materials. 13,14,22,29 Herein, a systematic investigation of the stability of the inac...

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confidence: 99%

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Stability of Inactive Components of Cathode Laminates for Lithium Ion Batteries at High Potential

Chen

Nguyen

et al. 2014

J. Electrochem. Soc.

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“…In this study, carbon coating was prepared by using glucose as carbon source at low pyrolysis temperature, which requires only short heating time in air. Similar carbon coating has been done and reported for other cathode materials [189,190]. and LNT/C-8.…”

Section: Effect Of Carbon Coating On Sol Gel Synthesized LI 2 Nitio 4supporting

confidence: 60%

Investigations of lithium insertion into transition metal oxide cathodes

Ko¹

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To the pursuit of powerful lithium ion battery for integration into future automobiles and various advanced applications, new generation cathode with good storage ability and sustainability is intensively studied and explored. Transition metal oxides with ordered rocksalt structure are one the mostly investigated candidates, which are able to insert/extract lithium ions with good structural tolerance for low power applications. However, the practicality of ordered rocksalt-based materials for high power applications are still restrained several intrinsic issues. Therefore, advancement in current lithium ion batteries technology are demanded to fulfill the application requirements.

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“…Carbon coating is another good example illustrating how coating conditions affect the coating quality. Carbon coating is typically formed via pyrolysis of carbon precursors such as table sugar [91], citric acid [92], resorcinol-formaldehyde polymer [97], sucrose [98], and starch [98]. Carbon will be oxidized and become gaseous CO and CO2 at high temperature in air.…”

Section: Methods For Forming Coatingsmentioning

confidence: 99%

Coating - A potent method to enhance electrochemical performance of Li(NixMnyCoz)O2 cathodes for Li-ion batteries

Shaw¹,

Ashuri²

2019

Adv. Mater. Lett.

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Layered lithium nickel manganese cobalt oxides, Li(NixMnyCoz)O2 where x + y + z = 1 (NMCs), have been studied extensively due to their higher capacity, less toxicity and lower cost compared to LiCoO2. However, widespread market penetration of NMCs as cathodes for Li-ion batteries (LIBs) is impeded by their poor capacity retention and low rate capability. Coatings provide an effective solution to these problems. This article focuses on review of the recent advancements in coatings of NMCs from the mechanism viewpoint. This is the first time that coatings on NMCs are reviewed based on their functionalities and mechanisms through which the electrochemical properties and performance of NMCs have been improved. To provide a comprehensive understanding of the functions and mechanisms offered by coatings, the following functions and mechanisms are reviewed individually: (i) scavenging HF in the electrolyte, (ii) scavenging water molecules in the electrolyte and thus suppressing HF propagation during charge/discharge cycles, (iii) serving as a buffer layer to minimize HF attack on NMCs and suppress side reactions between NMCs and the electrolyte, (iv) hindering phase transitions and impeding loss of lattice oxygen, (v) preventing microcracks in NMC particles to keep participation of most NMC material in lithiation/de-lithiation, and (vi) enhancing the rate capability of NMC cathodes. Finally, the personal perspectives on outlook are offered with an aim to stimulate further discussion and ideas on the rational design of coatings for durable and high performance NMC cathodes for the next generation LIBs in the near future.

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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

Cited by 20 publications

References 25 publications

Stability of Inactive Components of Cathode Laminates for Lithium Ion Batteries at High Potential

Stability of Inactive Components of Cathode Laminates for Lithium Ion Batteries at High Potential

Investigations of lithium insertion into transition metal oxide cathodes

Coating - A potent method to enhance electrochemical performance of Li(NixMnyCoz)O2 cathodes for Li-ion batteries

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