Comparative study of the electrochemical performance of LiNi0.5Co0.2Mn0.3O2 and LiNi0.8Co0.1Mn0.1O2 cathode materials for lithium ion batteries

Xi, Yukun; Liu, Yan; Zhang, Dengke; Jin, Shuangling; Zhang, Rui; Mu, Jin

doi:10.1016/j.ssi.2018.10.020

Cited by 59 publications

(30 citation statements)

References 31 publications

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“…LCO has a layered oxide structure in which Co can be substituted with Ni and Mn giving lithium nickel cobalt manganese oxide (NCM) materials with the general composition Li 1+ w (Ni x Co y Mn z ) 1‐ w O 2 ( x + y + z =1). Examples include NCM 111 or NCM 523; the three numbers x , y , z present the stoichiometric ratio of Ni : Co:Mn [3,4,5] . To increase the energy density, Li‐ and Mn‐rich NCM materials, often referred to as “overlithiated” NCM or “high‐energy NCM (HE‐NCM)” were developed [6] .…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, the nickel content may be increased and Ni‐rich CAMs such as NCM 622 or NCM 811 are more and more being commercialized due to their higher energy density, lower cobalt concentration, and reduced cost when compared to lithium cobalt oxide (LCO) or NCM 111 [7] . NCM 811 and beyond (NCM 851005 or 900505) offer practical capacities up to ≈200 mAh g −1 [8–10] in a layered α‐NaFeO 2 structure (space group

R \overline{3} m

) [4,8–12] . However, the materials have poorer thermal stability and performance at higher temperatures, [7,13] including faster capacity fading and shorter lifetime in comparison to NCM 111 [9,12,14] .…”

Section: Introductionmentioning

confidence: 99%

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Fluorination of Ni‐Rich Lithium‐Ion Battery Cathode Materials by Fluorine Gas: Chemistry, Characterization, and Electrochemical Performance in Full‐cells

Breddemann

Sicklinger

Schipper

et al. 2020

Batteries & Supercaps

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The mild fluorination of Ni‐rich NCM CAMs (NCM=nickel‐cobalt‐manganese oxide; CAM=cathode active material) with a few hundred mbar of elementary fluorine gas (F2) at room temperature was systematically studied. The resulting fluorinated CAMs were fully analyzed and compared to the pristine ones. Fluorination at room temperature converts part of the soluble basic species on the CAM‐surface into a protecting thin and amorphous LiF film. No formation of a metal fluoride other than LiF was detected. SEM images revealed a smoothened CAM surface upon fluorination, possibly due to the LiF film formation. Apparently due to this protecting, but insulating LiF‐film, the fluorinated material has a reduced electrical conductivity in comparison to the pristine material. Yet, all fluorinated Ni‐rich NCM CAMs showed a considerably higher press density than the pristine material, which in addition increased with higher fluoride concentrations. In addition, fluorination of the Ni‐rich CAMs led to the chemically induced formation of small amounts of water, which according to TGA‐MS‐measurements can be removed by heating the material to 450 °C for a few hours. Overall, the tested fluorinated NCM 811 samples showed improved electrochemical performance over the pristine samples in full‐cells with graphite anodes at 30 °C and 45 °C after 500 cycles. Moreover, the fluorination apparently reduces Mn and Co cross talk from the CAM to the anode active material (AAM) through the electrolyte during charge/discharge.

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Section: Introductionmentioning

confidence: 99%

R \overline{3} m

Section: Introductionmentioning

confidence: 99%

Fluorination of Ni‐Rich Lithium‐Ion Battery Cathode Materials by Fluorine Gas: Chemistry, Characterization, and Electrochemical Performance in Full‐cells

Breddemann

Sicklinger

Schipper

et al. 2020

Batteries & Supercaps

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“…We observed noticeably separated (006)/(102) and (108)/(110) peaks, which are consistent with the typical patterns of an ordered layered structure. Consequently, the pristine NCM811 cathode materials have the typical α-NaFeO 2 layered structure without any structural deformation or defects with a hexagonal crystal structure in the R-3m space group, as illustrated in the schematic of the NCM811 crystal structure [28][29][30][31][32].…”

Section: Resultsmentioning

confidence: 99%

“…Energies 2019, 12, x FOR PEER REVIEW 3 of 12 consistent with the typical patterns of an ordered layered structure. Consequently, the pristine NCM811 cathode materials have the typical α-NaFeO2 layered structure without any structural deformation or defects with a hexagonal crystal structure in the R-3m space group, as illustrated in the schematic of the NCM811 crystal structure [28][29][30][31][32]. To understand the effect of the microcracks formed between primary particles on the capacity fading of the NCM811 cathode material during high-temperature cycling tests, a pouch-type full cell containing the NCM811 cathode material was prepared and galvanostatically charged and discharged for 600 cycles at 45 °C.…”

Section: Resultsmentioning

confidence: 99%

Mechanism of Capacity Fading in the LiNi0.8Co0.1Mn0.1O2 Cathode Material for Lithium-Ion Batteries

Ahn

Cho

et al. 2019

Energies

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Understanding the capacity fading mechanism of the LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode materials is crucial for achieving long-lasting lithium-ion batteries with high energy densities. In this study, we investigated the factors affecting the capacity fading of NCM811 during repeated cycling at high temperatures. We found that the change in the c-axis length during charging and discharging is the main cause of the formation and propagation of microcracks in the primary particles of NCM811. In addition, the electrolyte is decomposed on the microcrack surfaces and, consequently, by-products are formed on the particle surface, increasing the impedance and resulting in poor electronic and ionic connectivity between the primary particles of NCM811. In addition, the transition metals in the NCM811 cathode material are dissolved in the electrolyte from the newly formed microcrack surface between primary particles. Therefore, the electrolyte decomposition and transition metal dissolution on the newly formed surface are the major deteriorative effects behind the capacity fading in NCM811.

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“…Because of its high specific capacity, LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) is a common cathode material in LIBs, which is considered to be the first choice in the new generation of high-energy density LIBs. [3] For batteries with NCM523 material as the cathode, the most direct way to increase energy density is to increase the charging voltage of lithium-ion cells. [4] However, conventional carbonate based solvents and LiPF 6 will undergo oxidative decomposition when the working voltage exceeds 4.3 V, which will seriously affect the cycle stability of the cells and even cause safety issues such as explosion.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Operating Voltage and Temperature Range by Adding Lithium bis(fluorosulfonyl)imide as Electrolyte Additive

et al. 2020

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Electrolytes consisting of carbonate solvents and LiPF 6 readily decompose at high operating voltages, causing poor battery performances. In order to meet the needs of high voltage and high specific energy cells, electrolytes with improved electrochemical stabilities are urgently required. Here, we have introduced the lithium bis(fluorosulfonyl)imide (LiFSI) as an electrolyte additive to accomplish this goal. Through the research in this paper, it is found that the electrolyte system with LiFSI can form more stable and uniform solid electrolyte interphase (SEI) film during the cycle, which can be used to suppress the decomposition of carbonate-based electrolytes. Subsequently, this finding is supported by the density functional calculations and the structural analysis. Li-Ni 0.5 Co 0.2 Mn 0.3 O 2 /graphite full cells with different amounts of LiFSI additive are fabricated to demonstrate the improvement of electrochemical performance. Working at 4.4 V and 1 C, the capacity retention rate of cells with 5 wt.% LiFSI is significantly enhanced compared with non-LiFSI (52.4 % for none and 85.0 % for 5 wt. % loading at room temperature after 120 cycles; 47.5 % for none and 80.0 % for 5 wt. % loading at 45°C after 100 cycles).

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Comparative study of the electrochemical performance of LiNi0.5Co0.2Mn0.3O2 and LiNi0.8Co0.1Mn0.1O2 cathode materials for lithium ion batteries

Cited by 59 publications

References 31 publications

Fluorination of Ni‐Rich Lithium‐Ion Battery Cathode Materials by Fluorine Gas: Chemistry, Characterization, and Electrochemical Performance in Full‐cells

Fluorination of Ni‐Rich Lithium‐Ion Battery Cathode Materials by Fluorine Gas: Chemistry, Characterization, and Electrochemical Performance in Full‐cells

Mechanism of Capacity Fading in the LiNi0.8Co0.1Mn0.1O2 Cathode Material for Lithium-Ion Batteries

Enhancement of Operating Voltage and Temperature Range by Adding Lithium bis(fluorosulfonyl)imide as Electrolyte Additive

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