Low Temperature Electrochemical Properties of Li[NixCoyMn1-x-y]O2Cathode Materials for Lithium-Ion Batteries

Yoon, Sanghoo; Sun, Yang‐Kook

doi:10.1149/2.0121410jes

Cited by 30 publications

(20 citation statements)

References 21 publications

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“…Such an increase of electrode polarization and capacity drop may partly contribute to the increased interface reaction impedance as well as slow ionic movement at low temperatures. [37][38] As we can see in Figure 4 a-b and Table 1, the deterioration in the capacity and declination of discharge plateaus can be effectively mitigated after Co doping.…”

Section: Morphologies and Edx Spectra Of The Samplesmentioning

confidence: 76%

Role of Cobalt Content in Improving the Low-Temperature Performance of Layered Lithium-Rich Cathode Materials for Lithium-Ion Batteries

Kou

Lai

et al. 2015

ACS Appl. Mater. Interfaces

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Layered lithium-rich cathode material, Li1.2Ni0.2-xCo2xMn0.6-xO2 (x = 0-0.05) was successfully synthesized using a sol-gel method, followed by heat treatment. The effects of trace amount of cobalt doping on the structure, morphology, and low-temperature (-20 °C) electrochemical properties of these materials are investigated systematically. X-ray diffraction (XRD) results confirm that the Co has been doped into the Ni/Mn sites in the transition-metal layers without destroying the pristine layered structure. The morphological observations reveal that there are no changes of morphology or particle size after Co doping. The electrochemical performance results indicate that the discharge capacities and operation voltages are drastically lowered along with the decreasing temperature, but their fading rate becomes slower when increasing the Co contents. At -20 °C, the initial discharge capacity of sample with x = 0 could retain only 22.1% (57.3/259.2 mAh g(-1)) of that at 30 °C, while sample with x = 0.05 could maintain 39.4% (111.3/282.2 mAh g(-1)). Activation energy analysis and electrochemical impedance spectroscopy (EIS) results reveal that such an enhancement of low-temperature discharge capacity is originated from the easier interface reduction reaction of Ni(4+) or Co(4+) after doping trace amounts of Co, which decreases the activation energy of the charge transfer process above 3.5 V during discharging.

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Section: Morphologies and Edx Spectra Of The Samplesmentioning

confidence: 76%

Role of Cobalt Content in Improving the Low-Temperature Performance of Layered Lithium-Rich Cathode Materials for Lithium-Ion Batteries

Kou

Lai

et al. 2015

ACS Appl. Mater. Interfaces

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“…A decrease in Co content or complete removal as NM90, as can be observed from Figure 9 a,b results in poor rate capability whose effect becomes accentuated at 0 °C (Figure S10, Supporting Information). At an elevated temperature (Figure c), the rate capability of NM90 becomes similar to that of NCM90 since the increase in both electronic and ionic conductivity at an elevated temperature wipes out the difference in conductivity caused by composition …”

Section: Resultsmentioning

confidence: 93%

Cobalt‐Free High‐Capacity Ni‐Rich Layered Li[Ni_0.9Mn_0.1]O₂ Cathode

Aishova

Park

Yoon

et al. 2019

Advanced Energy Materials

182

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Li[Ni0.9Co0.1]O2 (NC90), Li[Ni0.9Co0.05Mn0.05]O2 (NCM90), and Li[Ni0.9Mn0.1]O2 (NM90) cathodes are synthesized for the development of a Co‐free high‐energy‐density cathode. NM90 maintains better cycling stability than the two Co‐containing cathodes, particularly under harsh cycling conditions (a discharge capacity of 236 mAh g−1 with a capacity retention of 88% when cycled at 4.4 V under 30 °C and 93% retention when cycled at 4.3 V under 60 °C after 100 cycles). The reason for the enhanced stability is mainly the ability of NM90 to absorb the strain associated with the abrupt anisotropic lattice contraction/extraction and to suppress the formation of microcracks, in addition to enhanced chemical stability from the increased presence of stable Mn4+. Although the absence of Co deteriorates the rate capability, this can be overcome as the rate capability of the NM90 approaches that of the NCM90 when cycled at 60 °C. The long‐term cycling stability of NM90 is confirmed in a full cell, demonstrating that it is one of the most promising Co‐free cathodes for high‐energy‐density applications. This study not only provides insight into redefining the role of Mn in a Ni‐rich cathode, it also represents a clear breakthrough in achieving a commercially viable Co‐free Ni‐rich layered cathode.

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“…Single side coated electrodes were punched (1.2 cm diameter) for coin cells. The active material loading was ∼12.5 mg/cm 2 . The electrodes were dried overnight at 120…”

Section: Scanning Electron Microscopy Imaging (Sem)-a Nanosciencementioning

confidence: 99%

Synthesis of Single Crystal LiNi_0.5Mn_0.3Co_0.2O₂for Lithium Ion Batteries

Stone

et al. 2017

J. Electrochem. Soc.

174

123

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Single crystal Li[Ni 0.5 Mn 0.3 Co 0.2 ]O 2 materials in NMC532/artificial graphite cells have excellent long term charge-discharge cycle lifetime which greatly exceeds that of conventional NMC532 materials. There are a few patents from industry regarding the synthesis of single crystal NMC. In addition, there have only been a few reports in the academic literature showing that single crystal NMC with a grain size of ∼2-5 μm having good electrochemical performance was successfully synthesized, but these workers used complex approaches. This work systematically studies the steps required to synthesize single crystal NMC materials. The key synthesis steps including the impact of the Li to transition metal ratio, sintering temperature, precursor size and sintering time are discussed. This work provides guidance for the synthesis of single crystal NMC positive electrode materials that may be suitable for lithium-ion cells with high energy density and long lifetime. 1, the authors briefly discussed the synthesis method for single crystal materials, while the detailed information regarding the impact of the steps required to synthesize single crystal NMC materials was not discussed. In this work, the key synthesis steps including the impact of lithium to transition metal (Li/TM) ratio (molar), sintering temperature, sintering time and precursor size will be discussed. The optimization of the final synthesis conditions and evaluation of the electrochemical stability of the materials is not the main focus of this paper. However, the initial electrochemical properties, such as reversible specific capacity and irreversible specific capacity, of the best materials in this report are certainly competitive to commercial NMC532 materials. ExperimentalReagents used for the synthesis of single crystal NMC532 included nickel (II) sulfate hexahydrate (NiSO 4 • 6H 2 O, 98%, Alfa Aesar), manganese sulfate monohydrate (MnSO 4 • H 2 O, 98%, Alfa Aesar), sodium hydroxide (NaOH, 98%, Alfa Aesar), ammonium hydroxide (NH 4 OH, 28.0-30.0%, Sigma-Aldrich). All aqueous solutions used in the precursor synthesis were prepared with deionized (DI) water which was de-aerated by boiling for 10 minutes. Reagents used for coin cells included 1:2 v/v ethylene carbonate:diethyl carbonate (EC:DEC, BASF, purity 99.99%) and lithium hexafluorophosphate (LiPF 6 , BASF, purity 99.9%, water content 14 ppm).Synthesis of single crystal NMC532.-Ni 0.5 Mn 0.3 Co 0.2 (OH) 2 precursors were prepared via co-precipitation in a continuously stirred tank reactor (CSTR) (Brunswick Scientific/Eppendorf BioFlo 310). 9The details of the synthesis of similar precursors has been described by J. Li et al. 10,11 Precursors with three different sizes, labelled as large (L), medium (M) and small (S), were prepared individually by adjusting the pH and stirring rate. Unless specified, precursor L was * Electrochemical Society Fellow.z E-mail: jeff.dahn@dal.ca used for the synthesis of lithiated samples. The dried precursors were mixed with a stoichiometric equivalent of Li 2 CO ...

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Low Temperature Electrochemical Properties of Li[Ni_xCo_yMn_1-x-y]O₂Cathode Materials for Lithium-Ion Batteries

Cited by 30 publications

References 21 publications

Role of Cobalt Content in Improving the Low-Temperature Performance of Layered Lithium-Rich Cathode Materials for Lithium-Ion Batteries

Role of Cobalt Content in Improving the Low-Temperature Performance of Layered Lithium-Rich Cathode Materials for Lithium-Ion Batteries

Cobalt‐Free High‐Capacity Ni‐Rich Layered Li[Ni_0.9Mn_0.1]O₂ Cathode

Synthesis of Single Crystal LiNi_0.5Mn_0.3Co_0.2O₂for Lithium Ion Batteries

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Low Temperature Electrochemical Properties of Li[NixCoyMn1-x-y]O2Cathode Materials for Lithium-Ion Batteries

Cited by 30 publications

References 21 publications

Role of Cobalt Content in Improving the Low-Temperature Performance of Layered Lithium-Rich Cathode Materials for Lithium-Ion Batteries

Role of Cobalt Content in Improving the Low-Temperature Performance of Layered Lithium-Rich Cathode Materials for Lithium-Ion Batteries

Cobalt‐Free High‐Capacity Ni‐Rich Layered Li[Ni0.9Mn0.1]O2 Cathode

Synthesis of Single Crystal LiNi0.5Mn0.3Co0.2O2for Lithium Ion Batteries

Contact Info

Product

Resources

About

Low Temperature Electrochemical Properties of Li[Ni_xCo_yMn_1-x-y]O₂Cathode Materials for Lithium-Ion Batteries

Cobalt‐Free High‐Capacity Ni‐Rich Layered Li[Ni_0.9Mn_0.1]O₂ Cathode

Synthesis of Single Crystal LiNi_0.5Mn_0.3Co_0.2O₂for Lithium Ion Batteries