Thiophene-initiated polymeric artificial cathode-electrolyte interface for Ni-rich cathode material

Chae, Bum-Jin; Park, Jun Hwa; Song, Hye Ji; Jang, Seol Heui; Jung, Kwangeun; Park, Yeong Don; Yim, Taeeun

doi:10.1016/j.electacta.2018.09.103

Cited by 33 publications

(20 citation statements)

References 73 publications

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“…Surface-coating, as one of the breakthrough technologies, is widely used to circumvent the drawbacks of layered Ni-rich oxides. − Various coating materials including metal oxides, metal fluorides, and metal phosphate have been extensively studied. The surface-coating layers effectively hinder side reactions between the active material and the electrolyte, so as to improve the thermal stability of LiNi 0.6 Co 0.2 Mn 0.2 O 2 , and the possible reasons have been reported in former literature. , Furthermore, the high ionic conductivity of the Li 3 PO 4 coating has also been pointed out .…”

Section: Introductionmentioning

confidence: 99%

Superior Stability Secured by a Four-Phase Cathode Electrolyte Interface on a Ni-Rich Cathode for Lithium Ion Batteries

Yang¹,

Fan²,

Shi³

et al. 2019

ACS Appl. Mater. Interfaces

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A multifunctional coating with high ionic and electronic conductivity is constructed on the surface of LiNi0.8Co0.1Mn0.1O2 (NCM) to boost the battery stability upon cycling and during storage as well. Phosphoric acid reacts with residual lithium species on the pristine NCM to form a Li3PO4 coating with extra carbon nanotubes (CNTs) penetrating through, which shows high ionic and electronic conductivity. NCM, Li3PO4, CNTs, and the electrolyte jointly form a four-phase cathode electrolyte interface, which plays a key role in the great enhancement of capacity retention, from 50.3% for pristine NCM to 84.8% for the modified one after 500 cycles at 0.5C at room temperature. The modified NCM also delivers superior electrochemical performances at a high cut-off voltage (4.5 V), high temperature (55 °C), and high rate (10C). Furthermore, it can deliver 154.2 mA h g–1 at the 500th cycle after exposed to air with high humidity for 2 weeks. These results demonstrate that the well-constructed multifunctional coating can remarkably enhance the chemical and electrochemical performances of NCM. The improved cycling, storage, and rate performance are attributed to the four-phase cathode electrolyte interface delivering high electron and ionic conductivity and securing the cathode against attack. This work broadens the horizon for constructing effective electrode/electrolyte interfaces for electrochemical energy storage and conversion.

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Section: Introductionmentioning

confidence: 99%

Superior Stability Secured by a Four-Phase Cathode Electrolyte Interface on a Ni-Rich Cathode for Lithium Ion Batteries

Yang¹,

Fan²,

Shi³

et al. 2019

ACS Appl. Mater. Interfaces

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“…In view of coating materials with the protection effect, representative examples are oxides (Al 2 O 3 , TiO 2 , ZrO 2 , CeO 2 , ZnO, MgO, etc. ),95,143,159,192,193,194 sulfides,45 fluoride,166,195 artificial CEI layers,168,196 artificial SEI layer,154 and phosphates 99,104,105,108,113,116,158,197…”

Section: Service Life Of Ni‐rich Ncm For Libsmentioning

confidence: 99%

Ni‐Rich/Co‐Poor Layered Cathode for Automotive Li‐Ion Batteries: Promises and Challenges

Wang

Ding

Deng

et al. 2020

Advanced Energy Materials

293

218

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To pursue a higher energy density (>300 Wh kg−1 at the cell level) and a lower cost (<$125 kWh−1 expected at 2022) of Li‐ion batteries for making electric vehicles (EVs) long range and cost‐competitive with internal combustion engine vehicles, developing Ni‐rich/Co‐poor layered cathode (LiNi1−x−yCoxMnyO2, x+y ≤ 0.2) is currently one of the most promising strategies because high Ni content is beneficial to high capacity (>200 mAh g−1) while low Co content is favorable to minimize battery cost. Unfortunately, Ni‐rich cathodes suffer from limited structure stability and electrode/electrolyte interface stability in the charged state, leading to electrode degradation and poor cycling performance. To address these problems, various strategies have been employed such as doping, structural optimization design (e.g., core–shell structure, concentration‐gradient structure, etc.), and surface coating. In this review, five key aspects of Ni‐rich/Co‐poor layered cathode materials are explored: energy density, fast charge capability, service life including cycling life and calendar life, cost and element resources, and safety. This enables a comprehensive analysis of current research advances and challenges from the perspective of both academy and industry to help facilitate practical applications for EVs in the future.

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“…This electrolyte decomposition is much more severe at high temperature, implying a significant vulnerability of NCM cathode material is to high temperatures when compared with other conventional cathode materials. To overcome these problems, many strategies have been intensively explored, including: 1) development of NCM cathode material coated with oxides such as Al [31][32][33][34][35], 2) modification of NCM surface by the introduction of artificial cathode-electrolyte interphases (CEI) [36][37][38][39][40], and 3) use of functional additives in the electrolytes that can form a CEI layer on the surface of the NCM cathode material [41][42][43][44][45]. In recent studies, it has been reported that functional electrolyte additives evidently improve electrochemical performances of the Ni-rich NCM cathode material such as TPPO [46], DODSi [47], SA [48], 2-TS [49], and BFS [50], which have task-specific functional groups on the molecular structure of electrolyte additives.…”

Section: Introductionmentioning

confidence: 99%

Triphenyl phosphate as an Efficient Electrolyte Additive for Ni-rich NCM Cathode Materials

Jung

Yim

2021

J. Electrochem. Sci. Technol

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Nickel-rich lithium nickel-cobalt-manganese oxides (NCM) are viewed as promising cathode materials for lithium-ion batteries (LIBs); however, their poor cycling performance at high temperature is a critical hurdle preventing expansion of their applications. We propose the use of a functional electrolyte additive, triphenyl phosphate (TPPa), which can form an effective cathode-electrolyte interphase (CEI) layer on the surface of Ni-rich NCM cathode material by electrochemical reactions. Linear sweep voltammetry confirms that the TPPa additive is electrochemically oxidized at around 4.83 V (vs. Li/ Li +) and it participates in the formation of a CEI layer on the surface of NCM811 cathode material. During high temperature cycling, TPPa greatly improves the cycling performance of NCM811 cathode material, as a cell cycled with TPPa-containing electrolyte exhibits a retention (133.7 mA h g-1) of 63.5%, while a cell cycled with standard electrolyte shows poor cycling retention (51.3%, 108.3 mA h g-1). Further systematic analyses on recovered NCM811 cathodes demonstrate the effectiveness of the TPPa-based CEI layer in the cell, as electrolyte decomposition is suppressed in the cell cycled with TPPa-containing electrolyte. This confirms that TPPa is effective at increasing the surface stability of NCM811 cathode material because the TPPa-initiated PO x-based CEI layer prevents electrolyte decomposition in the cell even at high temperatures.

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Thiophene-initiated polymeric artificial cathode-electrolyte interface for Ni-rich cathode material

Cited by 33 publications

References 73 publications

Superior Stability Secured by a Four-Phase Cathode Electrolyte Interface on a Ni-Rich Cathode for Lithium Ion Batteries

Superior Stability Secured by a Four-Phase Cathode Electrolyte Interface on a Ni-Rich Cathode for Lithium Ion Batteries

Ni‐Rich/Co‐Poor Layered Cathode for Automotive Li‐Ion Batteries: Promises and Challenges

Triphenyl phosphate as an Efficient Electrolyte Additive for Ni-rich NCM Cathode Materials

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