Toward a high-voltage fast-charging pouch cell with TiO2 cathode coating and enhanced battery safety

Li, Yan; Liu, Xiang; Ren, Dongsheng; Hsu, Hungjen; Xu, Gui‐Liang; Hou, Junxian; Wang, Li; Feng, Xuning; Lu, Languang; Xu, Wenqian; Ren, Yang; Li, Ruihe; He, Xiangming; Amine, Khalil; Ouyang, Minggao

doi:10.1016/j.nanoen.2020.104643

Cited by 93 publications

(48 citation statements)

References 55 publications

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“…[42,67] The extreme capacity decay or -in the worst case -rapid rollover failure within the first 100 cycles in high-voltage operated LIB full cells has been observed by different researchers. [27,[68][69][70][71][72][73][74] However, we did not find any tangible indicators with respect to the correlation between the rollover failure and TM-induced Li metal deposition and growth at the anode, as the majority of research papers on high-voltage operating LIB full cells primarily focuses on the investigation of the cathode itself and the CEI layer.…”

Section: Mechanism Of High-voltage Induced Cell Failure Of Lib Cells mentioning

confidence: 56%

Exploiting the Degradation Mechanism of NCM523Graphite Lithium‐Ion Full Cells Operated at High Voltage

et al. 2020

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Layered oxides, particularly including Li[NixCoyMnz]O2 (NCMxyz) materials, such as NCM523, are the most promising cathode materials for high‐energy lithium‐ion batteries (LIBs). One major strategy to increase the energy density of LIBs is to expand the cell voltage (>4.3 V). However, high‐voltage NCM∥ graphite full cells typically suffer from drastic capacity fading, often referred to as “rollover” failure. In this study, the underlying degradation mechanisms responsible for failure of NCM523∥ graphite full cells operated at 4.5 V are unraveled by a comprehensive study including the variation of different electrode and cell parameters. It is found that the “rollover” failure after around 50 cycles can be attributed to severe solid electrolyte interphase growth, owing to formation of thick deposits at the graphite anode surface through deposition of transition metals migrating from the cathode to the anode. These deposits induce the formation of Li metal dendrites, which, in the worst cases, result in a “rollover” failure owing to the generation of (micro‐) short circuits. Finally, approaches to overcome this dramatic failure mechanism are presented, for example, by use of single‐crystal NCM523 materials, showing no “rollover” failure even after 200 cycles. The suppression of cross‐talk phenomena in high‐voltage LIB cells is of utmost importance for achieving high cycling stability.

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Section: Mechanism Of High-voltage Induced Cell Failure Of Lib Cells mentioning

confidence: 56%

Exploiting the Degradation Mechanism of NCM523Graphite Lithium‐Ion Full Cells Operated at High Voltage

et al. 2020

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“…To the best of our knowledge, the TR trigger temperature T 2 (260.1 °C) is the highest value obtained that has been reported for the high‐energy NMC811‐based cells via all kinds of safety improvements, including advanced fire‐extinguishing concentrated electrolyte (195.2 °C). [ 13,40,41 ] Moreover, the intrinsic safety performance of NMC811‐based cell with EC‐free electrolyte can even far exceed the level of improved NMC523‐based cell with ceramic polyethylene terephthalate non‐woven separator (231 °C). [ 12 ]…”

Section: Resultsmentioning

confidence: 99%

High‐Voltage and High‐Safety Practical Lithium Batteries with Ethylene Carbonate‐Free Electrolyte

Ren

Liu

et al. 2021

Advanced Energy Materials

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Serious safety issues are impeding the widespread adoption of high‐energy lithium‐ion batteries for transportation electrification and large‐scale grid storage. Herein, a triple‐salt ethylene carbonate (EC) free electrolyte for high‐safety and high‐energy pouch‐type LiNi0.8Mn0.1Co0.1O2|graphite (NMC811|Gr) cells is reported. This EC‐free electrolyte can effectively stabilize the NMC811 surface under high potential (up to 4.5 V), as well as generate a stable interphase to achieve a superior compatibility with the Gr anode. The electrolyte strategy enables significantly enhanced intrinsic safety (trigger temperature of thermal runaway (TR) increased by 67.0 °C), excellent electrochemical properties (4.2V, ≈100% after 200 cycles), and superior high voltage stability (4.5 V, 82.1% after 200 cycles). The work opens up a new avenue for developing novel electrolyte systems to build safer high‐energy batteries for practical applications.

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“…As summarized in Tables [1][2][3][4], which are categorized by the types of materials, surface control can be multi-functional and act as inhibitors of phase transition, oxygen release and gas generation, protective barriers for electrolyte decomposition and TM dissolution, mechanical buffers, moisture and air shields, HF scavengers, and electronic/ionic conductivity facilitator, greatly enhancing the energy density, rate capability, cycle life, and safety [33]. Defining the chemical/physical/structural changes of the outer and inner surfaces as surface modification, three types can be categorized: (1) surface coating, the dominant strategies, including electrochemically inactive compounds coating (e.g., metal oxides, fluorides, and phosphates) [34][35][36][37][38], Li impurities-reactive coating (Co 3 O 4 ) [39] and Li-reactive coating (MoO 3 ) [40], Li ion conductive coating (LiTi 2 O 4 , Li 2 ZrO 3 and Li 4 -Mn 5 O 12 ) [41][42][43], conducting polymer coating (e.g., polypyrrole (PPy), polyaniline (PANI) and poly (3,4-ethylenedioxythiophene) (PEDOT)) [44][45][46], and other materials coatings, such as MXene (e.g. Ti 3 C 2 T x ) [47] and conductive graphene matrix [48]; (2) gradient structure design, including core-shell structures [49][50][51][52], hierarchical architectures (i.e., multi-shell) [53][54][55], and concentration gradient (CG) structures [56][57][58]; and (3) other surface treatments, such as rinsing with water to form an oxygendepleted surface layer [59,60], utilizing atomic surface reduction to alter the electronic structure of the surface …”

Section: Introductionmentioning

confidence: 99%

A review on the stability and surface modification of layered transition-metal oxide cathodes

et al. 2021

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An ever-increasing market for electric vehicles (EVs), electronic devices and others has brought tremendous attention on the need for high energy density batteries with reliable electrochemical performances. However, even the successfully commercialized lithium (Li)-ion batteries still face significant challenges with respect to cost and safety issues when they are used in EVs. From a cathode material point of view, layered transition-metal (TM) oxides, represented by LiMO 2 (M = Ni, Mn, Co, Al, etc.) and Li-/Mn-rich xLi 2 MnO 3 Á(1-x)LiMO 2 , have been considered as promising candidates because of their high theoretical capacity, high operating voltage, and low manufacturing cost. However, layered TM oxides still have not reached their full potential for EV applications due to their intrinsic stability issues during electrochemical processes. To address these problems, a variety of surface modification strategies have been pursued in the literature. Herein, we summarize the recent progresses on the enhanced stability of layered TM oxides cathode materials by different surface modification techniques, analyze the manufacturing process and cost of the surface modification methods, and finally propose future research directions in this area.

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Toward a high-voltage fast-charging pouch cell with TiO2 cathode coating and enhanced battery safety

Cited by 93 publications

References 55 publications

Exploiting the Degradation Mechanism of NCM523Graphite Lithium‐Ion Full Cells Operated at High Voltage

Exploiting the Degradation Mechanism of NCM523Graphite Lithium‐Ion Full Cells Operated at High Voltage

High‐Voltage and High‐Safety Practical Lithium Batteries with Ethylene Carbonate‐Free Electrolyte

A review on the stability and surface modification of layered transition-metal oxide cathodes

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