A LiNi0.8Co0.15Al0.05O2/Ge electrochemical system for lithium-ion batteries

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LiNi0.8Co0.15Al0.05O2 coated by chromium oxide as a cathode material for lithium-ion batteries

Journal of Solid State Electrochemistry - LiNi0.8Co0.15Al0.05O2 (NCA) material was decorated with different contents of Cr2O3 (0.01–2 wt%) via a precipitation technique followed by...     

Surface modification of LiNi0.8Co0.1Mn0.1O2 with conducting polypyrrole

A facile method for the surface modification of high-voltage and high-temperature LiNi_0.8Co_0.1Mn_0.1O₂ cathode materials is demonstrated. In order to prepare polypyrrole (PPy) coating LiNi_0.8Co_0.1Mn_0.1O₂ material, the facile chemical polymerization method uses Fe(III) tosylate as oxidant and ethanol as solvent to avoid the side reaction with solvent. TEM depicts that LiNi_0.8Co_0.1Mn_0.1O₂ serves as hard template and the nanoscale PPy layer grows along the surface of LiNi_0.8Co_0.1Mn_0.1O₂ during the synthesis process. Because of flocculent and nanofiber coating layer, much improved rate performance, high temperature cycling, as well as high voltage performance are obtained. Cyclic voltammetry (CV) and electrochemical impedance spectroscopic (EIS) results demonstrate that the PPy coating layer effectively alleviates the side reactions between liquid electrolytes and LiNi_0.8Co_0.1Mn_0.1O₂ surface that are highly unstable at high temperature and high charge voltage.     

A novel method for the modification of LiNi0.8Co0.15Al0.05O2 with high cycle stability and low pH

Journal of Solid State Electrochemistry - Ni-rich cathode materials have high specific capacity and low cost, but they also have several drawbacks, such as high pH and poor cycle stability. In this...     

A ternary oxide precursor with trigonal structure for synthesis of LiNi0.80Co0.15Al0.05O2 cathode material

Journal of Solid State Electrochemistry - A Ni-Co-Al ternary oxide precursor with a trigonal structure, which can be used to synthesize LiNi0.8Co0.15Al0.05O2 cathode material, was prepared by...     

Rearrangement on surface structures by boride to enhanced cycle stability for LiNi0.80Co0.15Al0.05O2 cathode in lithium ion batteries

The side reaction between the active material and liquid-electrolyte cause structural damage and particle pulverization is one of the important factors leading to the capacity decay of LiNi0.80Co0.15Al0.05O2(NCA)materials in Li ion batteries(LIBs).Surface modification is an effective strategy for NCA cathodes,which could alleviate the degradation associated with surface processes.Herein,a surface structure rearrangement of NCA cathode secondary particles was reported by in-situ forming a solid electrolyte LiBO2.The LiBO2 is beneficial for alleviating the stress during charge/discharge process,thereby slowing down the rate of cracks formation in the secondary particles,which facilitates the Li+de-intercalation as well as prevents penetration of the liquid-electrolyte into the interior of the particles.As a result,the surface structure rearrangement NCA(RS-NCA)delivers a high discharge capacity of 202.5 m Ah g^-1 at 0.1 C,and exhibits excellent cycle stability with discharge capacity retaining 148 m Ah g^-1 after 200 cycles at 2 C.This surface structure rearrangement approach provides a new viewpoint in designing high-performance high-voltage LIBs.     

Complementary dual-doping of LiNi0.8Co0.1Mn0.1O2 cathode enhances ion-diffusion and stability for Li-ion batteries

The Ni-rich LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) layered cathodes endow Li-ion batteries (LIBs) with high energy density. However, they usually suffer from limited ion-diffusion and structural instability during cycling. Although doping strategy can effectively alleviate these issues, the coupling effects of multi-element doping and the corresponding performance enhancement mechanism have been yet unclear. Here, we report a Zr/Ti dual-doped NCM811 cathode material (ZT-NCM811), in which Zr-ion is doped into both transition metal (TM) layers and lithium layers and Ti-ion is only distributed in TM layers. The dual-doping can effectively enhance crystal structure stability via inhibiting the lattice collapse along c-axis and decreasing the Li/Ni disorder. Meantime, the lattice oxygen escape is also greatly reduced due to the presence of stronger Zr-O and Ti-O bonds, further mitigating the crystal surface parasitic reactions with electrolyte. The resultant ZT-NCM811 exhibits high specific capacity of 124 mAh/g at even 10 C, much higher than undoped and single-doped NCM811, and a retention of 98.8% at 1 C after 100 cycles. The assembled ZT-NCM811/graphite full cell also delivers superior battery performances and durability.     

Improved electrochemical properties of LiNi0.8Co0.15Mn0.05O2 prepared using Mn3O4-coated Ni0.842Co0.158(OH)2

Journal of Solid State Electrochemistry - Ni-rich cathode materials with core-shell structure are promising candidate materials for lithium-ion batteries, since they have excellent electrochemical...     

Enhanced electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathode via dual-functional lanthanide modification

Journal of Solid State Electrochemistry - This study investigates the use of lanthanide elements to modify a layered oxide cathode through solid-state calcination. Based on the findings, the...     

Improved electrochemical properties of LiNi0.8Co0.15Al0.05O2 cathode materials synthesized using micelle structures

Journal of Solid State Electrochemistry - Although LiNi0.8Co0.15Al0.05O2 (NCA) has various merits such as a high discharge capacity of ~ 195 mAh g−1, improved...     

不同铝源制备LiNi_(0.8)Co_(0.15)Al_(0.05)O_2正极材料及电化学性能影响

采用共沉淀-高温固相法在氧气气氛下合成球形Li Ni0.8Co0.15Al0.05O2正极材料。通过XRD、SEM、恒电流充放电测试和交流阻抗测试等手段分析了氧化铝、氢氧化铝和异丙醇铝三种铝源对合成材料的结构、形貌以及电化学性能的影响。结果表明,以三种不同铝源所合成的正极材料均具有良好的层状结构。用异丙醇铝合成的正极材料具有最小的一次颗粒,球型度较好,具有优异的电化学性能,在0.2 C下首次放电比容量为189.22 m Ah/g,50次循环后容量保持率为84.2%。然后,通过EIS测试分析了不同铝源对合成材料性能影响的原因。     

Three-dimensional Li-ion transportation in Li2MnO3-integrated LiNi0.8Co0.1Mn0.1O2

Ni-rich layered cathodes (LiNixCoyMnzO2) have recently drawn much attention due to their high specific capacities.However,the poor rate capability of LiNixCoyMn...     

电/离子导体双包覆的LiNi0.8Co0.1Mn0.1O2锂离子电池阴极材料及其电化学性能

高镍三元材料LiNi_0.8Co_0.1Mn_0.1O₂ (NCM)比容量高且成本低, 但材料结构在电化学循环过程中的不稳定性影响了其大规模的应用, 可采用表面包覆的策略来改善材料的结构稳定性, 从而提高其电化学性能. 本工作结合高速固相包覆法和高温烧结法, 分别将电子导体氧化锡锑(ATO)和锂离子导体偏磷酸锂(LOP)共同包覆在NCM材料表面. 双包覆后的NCM材料的电子电导率从2.17×10^-3 Ѕ•cm^-1提高至1.02×10^-2 Ѕ•cm^-1, 锂离子扩散系数也从7.05×10^-9 cm²•s^-1提高至2.88×10^-8 cm²•s^-1. 同时, NCM表面的双包覆层可以在循环过程中阻止电极材料与电解液发生氧化还原反应, 抑制材料不利相变, 减少氧的析出, 稳定材料结构. 电化学性能测试表明, 经过表面包覆后, NCM材料在1 C (180 mA•g^-1)的电流下和2.7~4.3 V (vs. Li/Li⁺)的电压范围内, 循环150周后容量为161.1 mAh•g^-1, 保持率为87.1%, 而在10 C的充放电倍率下具有133 mAh•g^-1的可逆比容量.     

Synthesis and characterization of Li[(Ni0.8Co0.1Mn0.1)0.8(Ni0.5Mn0.5)0.2]O2 with the microscale core-shell structure as the positive electrode material for lithium batteries

The high capacity of Ni-rich Li[Ni(1-x)M(x)]O(2) (M = Co, Mn) is very attractive, if the structural instability and thermal properties are improved. Li[Ni(0.5)Mn(0.5)]O(2) has good thermal and structural stabilities, but it has a low capacity and rate capability relative to the Ni-rich Li[Ni(1-x)M(x)]O(2). We synthesized a spherical core-shell structure with a high capacity (from the Li[Ni(0.8)Co(0.1)Mn(0.1)]O(2) core) and a good thermal stability (from the Li[Ni(0.5)Mn(0.5)]O(2) shell). This report is about the microscale spherical core-shell structure, that is, Li[Ni(0.8)Co(0.1)Mn(0.1)]O(2) as the core and a Li[Ni(0.5)Mn(0.5)]O(2) as the shell. A high capacity was delivered from the Li[Ni(0.8)Co(0.1)Mn(0.1)]O(2) core, and a high thermal stability was achieved by the Li[Ni(0.5)Mn(0.5)]O(2) shell. The core-shell structured Li[(Ni(0.8)Co(0.1)Mn(0.1))(0.8)(Ni(0.5)Mn(0.5))(0.2)]O(2)/carbon cell had a superior cyclability and thermal stability relative to the Li[Ni(0.8)Co(0.1)Mn(0.1)]O(2) at the 1 C rate for 500 cycles. The core-shell structured Li[(Ni(0.8)Co(0.1)Mn(0.1))(0.8)(Ni(0.5)Mn(0.5))(0.2)]O(2) as a new positive electrode material is a significant breakthrough in the development of high-capacity lithium batteries.     

大孔高镍LiNi0.8Co0.1Mn0.1O2正极材料的制备及其电化学性能研究

本工作以聚甲基丙烯酸甲酯(PMMA)微球组装成的胶晶模板作为铸模,溶胶-凝胶法辅助获得大孔LiNi0.8Co0.1Mn0.1O2 (NCM811)正极材料.结果 表明,利用PMMA作为造孔剂,形成了由100nm的颗粒堆积而成的大孔结构,这种结构有效地提高了材料的倍率性能和循环稳定性.大孔NCM811在0.1C的首次放电...     

Na-doped layered LiNi0.8Co0.1Mn0.1O2 with improved rate capability and cycling stability

Journal of Solid State Electrochemistry - We have prepared LiNi0.8Co0.1Mn0.1O2 (LNMCO) doped with Na+ and studied its properties using X-ray diffraction (XRD), energy dispersive X-ray analysis...     

In situ raman microscopy of individual LiNi0.8Co0.15Al0.05O2 particles in a Li-ion battery composite cathode

Kinetic characteristics of Li+ intercalation/deintercalation into/from individual LiNi0.8Co0.15Al0.05O2 particles in a composite cathode were studied in situ using Raman microscopy during galvanostatic charge-discharge in 1.2 M LiPF6, ethylene carbonate (EC): ethyl methyl carbonate (EMC), 3:7 by volume. Ex situ spectroscopic analysis of a cathode that was removed from a tested high-power Li-ion cell, which suffered substantial power and capacity loss, showed that the state of charge (SOC) of oxide particles on the cathode surface was highly nonuniform despite deep discharge of the Li-ion cell at the end of the test. In situ monitoring of the SOC of selected oxide particles in the composite cathode in a sealed spectro-electrochemical cell revealed that the rate at which particles charge and discharge varied with time and location. The inconsistent kinetic behavior of individual oxide particles was attributed to degradation of the electronically conducting carbon matrix in the composite cathode upon testing. These local microphenomena are most likely responsible for the overall impedance rise of the cathode and contribute to the mechanism of lithium-ion cell failure.     

Template-synthesized LiCoO2, LiMn2O4, and LiNi0.8 Co0.2 O2 nanotubes as the cathode materials of lithium ion batteries

The first point of this work is to synthesize LiCoO2, LiNi0.8 Co0.2 O2, and LiMn2O4 nanotubes with the template of porous anodic aluminum oxide by thermal decomposition of sol-gel precursors. The as-synthesized materials were open-ended nanotubes with uniform shape and size based on the analysis of scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. An "in situ reaction from nanoparticle to nanotube" mechanism was discussed for the formation process of the nanotubes. The second point of this paper is to investigate the electrochemical properties of the as-synthesized nanotubes for the cathode materials of lithium ion batteries. It was found that the nanotube electrodes exhibited better reversibility and higher discharge capacities than that of their nanocrystalline counterparts. The reason for the improved electrochemical performance of the nanotube electrodes was also interpreted.     

Enhanced electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathode via wet-chemical coating of MgO

Journal of Solid State Electrochemistry - LiNi0.8Co0.1Mn0.1O2 (NCM811) has a high potential for using as the cathode material for lithium–ion batteries (LIBs) for electric vehicles owing to...     

锂离子电池正极材料LiNi_0.5Mn_1.5O_4表面包覆CuO的研究

本文首先通过共沉淀法和固相球磨法制备了纳米级的LiNi0.5Mn1.5O4高电压正极材料,然后通过溶胶-凝胶法制备了表面包覆CuO的CuO-LiNi0.5Mn1.5O4复合材料.通过对CuO包覆量为1%,3%和5%的复合材料的电化学性能对比,发现当包覆量为1%时,材料的性能最佳.在1 C下,材料的放电比容量高达126.1 mA h g?1,循环100次后容量保持率在99.5%.CuO包覆在纳米LiNi0.5Mn1.5O4材料表面,阻止电解液与活性颗粒的直接接触,削弱了电解液与LiNi0.5Mn1.5O4的相互作用,进而在一定程度上减缓了电解液的分解;CuO的包覆同时还缓解了电解液中HF对材料的攻击,阻止了锰的溶解和由此带来的结构改变,进而提高了材料的循环稳定性.