Effect of heat-treatment on the surface structure and electrochemical behavior of AlPO4-coated LiNi1/3Co1/3Mn1/3O2 cathode materials

Wang, Jianhua; Wang, Yu; Guo, Yuzhong; Ren, Zhaoying; Liu, Changwei

doi:10.1039/c3ta00064h

Cited by 75 publications

(29 citation statements)

References 15 publications

(24 reference statements)

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“…In combination with simulated impedance 10 parameters from equivalent circuit in Table S3, the LNCMO-Si0.02 sample has the smallest charge transfer resistance of 62.28 ohm, which is 1.61, 1.60 and 1.77 times less than the pristine sample, LNCMO-Si0.04 sample and LNCMO-Si0.06 sample, respectively. Charge transfer is closely related to the surface state of the cathode material particles [33][34][35] . As mentioned above, after Si doping, morphology of the particles changes from angular-shaped to elliptic-shaped.…”

Section: Resultsmentioning

confidence: 99%

Tuning the Electronic Structure of the Metal–Oxygen Group by Silicon Substitution in Lithium-Rich Manganese-Based Oxides for Superior Performance

Yan

et al. 2016

J. Phys. Chem. C

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Si-doped layered manganese-based lithium-rich oxides were used as cathode for lithium-ion battery. The silicon doped electrode exhibits exceptional specific capacity as well as rate capability compared to pristine sample. In particular, the modified cathode shows noticeable enhancement of the thermal stability wherein the heat release reduces and the position of exothermic peak increases by 60°C. First principles calculations suggest that as Si atoms occupy sites of transition metal in Si-doped Li-rich material, which gives rise to appreciable downshift of the O 2p band relative to pristine sample.

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Section: Resultsmentioning

confidence: 99%

Tuning the Electronic Structure of the Metal–Oxygen Group by Silicon Substitution in Lithium-Rich Manganese-Based Oxides for Superior Performance

Yan

et al. 2016

J. Phys. Chem. C

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“…[28][29][30][31][32][33][34][35][36][37][38] To date, the metal phosphates have become an efficient coating layer to improve the NCM performance because of their great anti-corrosive feature to the acidic compound (e.g., HF) in the electrolyte. 39,40 In addition, the metal phosphates are more robust than metal oxides 41,42 (i.e., the higher binding energy of "M-OP" than that of "M-O"), 43 and also much easier to handle than fluorides. 44,45 However, there is only one soultion-based precipitation method developed in the past two decades, [46][47][48][49][50] where a uniform and ultrathin coating is still a great challenge.…”

Section: Thermal Runwaymentioning

confidence: 99%

New Organic Complex for Lithium Layered Oxide Modification: Ultrathin Coating, High-Voltage, and Safety Performances

Ming

et al. 2019

ACS Energy Lett.

107

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Surface modification of a cathode (e.g., lithium layered oxide, NCM) has become ever more important in lithium-ion batteries, particularly for pursuing higher energy densities and safety at high voltage. This is because structural degradation of the cathode can be mitigated significantly. Herein, an organic complex is introduced for metal phosphate (e.g., AlPO 4 ) modification through a new film-forming process in nonaqueous solution. This general strategy overcomes the challenge of nonuniform coating in current precipitation methods and then opens a new avenue toward ultrathin surface modification on a molecular scale. As one example, asprepared AlPO 4 -coated NCM exhibits much improved structural and electrochemical stability; meanwhile, thermal runaway can be suppressed significantly in overcharged cells using the modified NCM, demonstrating higher and reliable safety features. The great improvements benefit from the uniform and ultrathin AlPO 4 coating, which inhibits the collapse and conversion of the layered structure to spinel, especially to the rock salt structure at high-voltage conditions, as confirmed by HRTEM and EELS.

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“…However, the inert metal oxides are often poor electronic and ionic conductors, which usually leads to a large irreversible capacity and poor rate performance. Recently, some Li-contained oxides, such as Li 2 CO 3 , LiAlO 2 , LiCoO 2 , and Li 4 Ti 5 O 12 [21][22][23][24], were introduced as coating materials for Li(Ni 1-x-y Co x Mn y )O 2 electrode, since it availably enhance the electrochemical performance because of their good conductivity and also provide the tunnel for Li + transportation during charge/discharge process [18,[25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Li2ZrO3-coated LiNi0.6Co0.2Mn0.2O2 for high-performance cathode material in lithium-ion battery

Sun

Qu³

et al. 2015

Ionics

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To improve the high-rate capacity and cycle ability, Li 2 ZrO 3 was successfully coated on LiNi 0.6 Co 0.2 Mn 0.2 O 2 materials via wet chemical method. The crystal structure and electrochemical properties of the bare and coated material are studied by X-ray diffractometry (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), cyclic voltammetry, and electrochemical impedance spectroscopy (EIS). The XRD and SEM results indicated that the lattice structure of Li 2 ZrO 3 -coated materials was the same as the pristine one. Transmission electron microscopy showed that there was a thin Li 2 ZrO 3 coating layer on the surface. Li 2 ZrO 3 -coating improves the rate performance and cycling stability. Within the cutoff voltage of 2.6-4.8 V, the 1 wt% Li 2 ZrO 3 -coated samples exhibited an initial discharge capacity of 190 mAh g −1 and with a capacity retention about 85 % after 50 cycles at 0.1 C. Minor Li 2 ZrO 3 modification plays an important role to enhance the high-rate capability and cycle ability of LiNi 0.6 Co 0.2 Mn 0.2 O 2 .

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Effect of heat-treatment on the surface structure and electrochemical behavior of AlPO4-coated LiNi1/3Co1/3Mn1/3O2 cathode materials

Cited by 75 publications

References 15 publications

Tuning the Electronic Structure of the Metal–Oxygen Group by Silicon Substitution in Lithium-Rich Manganese-Based Oxides for Superior Performance

Tuning the Electronic Structure of the Metal–Oxygen Group by Silicon Substitution in Lithium-Rich Manganese-Based Oxides for Superior Performance

New Organic Complex for Lithium Layered Oxide Modification: Ultrathin Coating, High-Voltage, and Safety Performances

Li2ZrO3-coated LiNi0.6Co0.2Mn0.2O2 for high-performance cathode material in lithium-ion battery

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