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Layered metal oxide cathode material for lithium ion batteries

A lithium-ion battery and cathode material technology, which is applied in the direction of lithium batteries, battery electrodes, positive electrodes, etc., can solve the problems of low conductivity, high capacity attenuation, high impedance of Li-ion batteries, etc., and achieve high conductivity and high porosity , the effect of excellent electrochemical performance

Inactive Publication Date: 2017-04-19
NORTHEASTERN UNIV LIAONING
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  • Abstract
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  • Claims
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Problems solved by technology

However, these materials have several disadvantages that need to be addressed before they can be practically applied to batteries, including: (i) high irreversible capacity loss with oxygen generation during initial activation charge; Low discharge rate capacity and high capacity fade; (iii) low conductivity, which leads to high impedance in Li-ion batteries; and (iv) voltage hysteresis and phase transition after extended cycling

Method used

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  • Layered metal oxide cathode material for lithium ion batteries
  • Layered metal oxide cathode material for lithium ion batteries
  • Layered metal oxide cathode material for lithium ion batteries

Examples

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Effect test

Embodiment 1

[0074] Embodiment 1. Preparation of cathode material

[0075] 0.5Li 2 MnO 3 -0.5LiMn 0.5 Ni 0.35 co 0.15 o 2 The preparation method is described in figure 1 middle. In a beaker, an appropriate amount of Mn(Ac) 2 4H 2 O (Sigma Aldrich>99%), Ni (NO 3 ) 2 ·6H 2 O (Alfa Aesar-Puratronic), Co (NO 3 ) 2 ·6H 2 O (Alfa Aesar-Puratronic) was dissolved in distilled water at room temperature. Nitric acid and glycine (Sigma Aldrich >99%) were added to the solution and heated to 120°C, at which point a spontaneous combustion reaction occurred. Different ratios of glycine as a fuel source were used to optimize and control the combustion reaction. Glycine is a known transition metal complexing agent due to the presence of both carboxylic acid and amino groups in its structure. Acetate precursors are used to generate substantial gaseous by-products of the combustion reaction which lead to materials with an open porous microstructure. The material obtained from the combusti...

Embodiment 2

[0076] Example 2. Characterization of cathode materials

[0077] The structure-property relationship characterization of the high-rate Li-enriched MNC cathode material used XRD, FESEM and energy dispersive spectroscopy (EDS), XAS, and HRTEM, combined with electrochemical discharge-charge cycle tests and electrochemical Impedance spectroscopy (EIS). The diffraction patterns of the materials were obtained using a Rigaku Ultima IV diffractometer with CuKa radiation. The unit cell of each sample was analyzed by the PDXL software program provided by Rigaku Corporation. The VESTA software (K. Momma and F. Izumi, J. Appl. Crystallogr., 2011, 44, 1272-1276) was run to visualize the unit cell in order to understand the reaction process. For ex situ XRD experiments, electrodes obtained from cycled Li cells were thoroughly rinsed with anhydrous dimethyl carbonate (DMC) to remove possible electrolyte residues before inspection. Morphological and structural studies were observed using...

Embodiment 3

[0078] 0.5Li in embodiment 3.Li battery 2 MnO 3 -0.5LiMn 0.5 Ni 0.35 co 0.15 O 2 electrochemical performance

[0079] Figure 6AThe electrochemical behavior of the SIC-MNC cathode, and its outstanding cycling stability at 1C and other discharge rates are presented. The initial discharge capacity at C-rate was about 220 mAh / g, which stabilized at about 200 mAh / g after several cycles, and maintained this value even after 100 cycles, with excellent Coulombic efficiency. The capacity fade rate between the 10th and 100th cycle is less than 0.01%, which is unprecedented for this type of material. At this decay rate, the cathode will lose less than 10% of its capacity after 1000 cycles. Even a 20% capacity loss after 1000 cycles is excellent for this type of next-generation cathode material. The material exhibited a remarkable capacity retention of >99% at C / 4, with a capacity of about 250 mAh / g after 90 cycles (see Figure 6A The inset of , which also shows th...

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Abstract

The invention provides a cathode material for Ll-ion batteries. The material has the formula of 0.5Li2Mn03-0.5LiMn0.5Ni0.35Co0.1502. The material was synthesized using the "self-ignition combustion" method, which previously has not been used for the preparation of Li-rich layered metal oxides. The cathode material exhibits capacities of 290, 250, and 200 mAh / g at discharge rates of C / 20, C / 4 and C rates, respectively. Moreover, the new material exhibits high rate cycling ability with little or no capacity fade for over 100 cycles demonstrated at a series of rates from C / 20 to 2C rates for electrodes loadings of 7-8 mg / cm2.

Description

[0001] Statement Regarding Federally Sponsored Research or Development [0002] The present invention is supported by the grant number P30-EB-009998 of the National Institute of Biomedical Imaging and Bioengineering of the National Institutes of Health and the contract number GTS-S-14- 164 grants. The US Government has certain rights in this invention. Background technique [0003] The general formula is xLi 2 MnO 3 -(1-x)LiMO 2 Lithium-enriched transition metal oxide group, where M is a transition metal, and the layered lithium manganate (Li 2 MnO 3 ) and layered lithium metal oxide (LiMO 2 ) are interpenetrated and are expected to be used as cathode materials for lithium-ion batteries. These materials can give discharge capacities greater than 250 mAh / g at low to moderate discharge rates of C / 5 to C / 20. In the initial charging of these materials, Li from layered LiMO 2 The structure is extracted up to a voltage of about 4.4V, and then passed at a potential between 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/46
CPCC01G53/50C01P2002/72C01P2002/80C01P2002/85C01P2004/03C01P2004/04C01P2004/50C01P2006/12C01P2006/16C01P2006/40H01M4/505H01M4/525H01M10/052H01M2004/028Y02E60/10C01G45/1257C01P2002/22C01P2004/62H01M4/362H01M10/0525Y02T10/70
Inventor M·N·阿泰斯K·M·亚伯拉罕S·慕克吉
Owner NORTHEASTERN UNIV LIAONING
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