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Preparation method of Co-covered nickel hydroxide anode material with surface covered by rare earth compound

A technology of rare earth compounds and rare earth hydroxides, applied in the field of materials, can solve the problems of thick coating layer detachment, insufficient high temperature characteristics, battery specific capacity, specific power electrochemical performance reduction, etc., to achieve excellent high temperature characteristics, high current charging The effect of excellent discharge performance

Inactive Publication Date: 2010-06-09
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The thick cladding layer is also easy to detach from the substrate during the phase transition process, and the electrochemical performance of the battery such as specific capacity and specific power decreases instead.
Therefore, its application is limited to a certain extent
[0006] (2) The phase composition of the coating layer is not strictly controlled
In the battery system, the oxidation-reduction reaction and the electrochemical oxidation-reduction reaction make the valence state of Co present as Co 2+ 、Co 3+ 、Co 4+ , the chaos of Co oxidation caused the fluctuation of battery parameters, so that it cannot be used in EV and HEV battery packs
[0007] (3) Low capacity and insufficient high temperature characteristics
Obviously, it cannot fully meet the high temperature and high current charging and discharging conditions of Ni / MH power batteries

Method used

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  • Preparation method of Co-covered nickel hydroxide anode material with surface covered by rare earth compound

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Experimental program
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Effect test

Embodiment 1

[0033] Take 2400g of Co2.0% spherical Ni(OH), add 2.88L of deionized water to form a 3L solution, stir evenly and add to the reactor, the mother liquor is continuously stirred in the reactor for 12h, and the temperature is controlled at 30°C; at 65L / h Add NaOH solution with a concentration of 7.95mol L-1 to the mother liquor, control the pH value in the reactor to 12, and control the reaction temperature at 50±2°C; add 0.05mol L-1 at a flow rate of 1400L / h 1YbCl3, continuously adjust the flow rate of the feed liquid, increase the flow rate by 2l / min, and control the pH value in the reactor to 12 at the same time to form a "gradient coating"; The complete feed liquid was released, aged for more than 12 hours, filtered, washed with deionized water until neutral, and dried at 80°C for 3 hours to obtain a Co-coated nickel hydroxide positive electrode material coated with Yb(OH)3 on the surface.

Embodiment 2

[0035] Take Co2.0% spherical Ni(OH)2 400g, add 2.88L of deionized water to form a 3L solution, stir evenly and add to the reactor, the mother liquor is continuously stirred in the reactor for 12h, and the temperature is controlled at 30°C; Add the prepared 7.95mol L-1NaOH solution into the mother liquor at a flow rate of h, control the pH value in the reactor to 12, and control the reaction temperature at 50±2°C; add 0.05mol L-1ErCl3 at a flow rate of 13001 / h , constantly adjust the flow rate of the feed liquid, increase the flow rate by 2l / min, and control the pH value in the reactor to 12 at the same time to form a "gradient coating". The feed liquid was released, aged for more than 12 hours, filtered, washed with deionized water until neutral, and dried at 80°C for 3 hours to obtain a Co-coated nickel hydroxide positive electrode material coated with Er(OH)3 on the surface.

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Abstract

The invention relates to a preparation method of a Co-covered nickel hydroxide anode material with the surface covered by a rare earth compound, belonging to the field of materials. The preparation method is characterized by covering a certain amount of Yb(OH)3 or Er(OH)3 on the upper surface of the nickel hydroxide material covered by 2.0 percent Co(OH)2. The discharge capacity of nickel hydroxide covered by 2 percent Yb(OH)3 is enhanced by 45 mAh / g compared with uncovered nickel hydroxide during 0.2 C charge and discharge at the high-temperature performance of 65 DEG C; the utility ratio of active materials of the nickel hydroxide covered by the 2 percent Yb(OH)3 is still 85 percent; the high-temperature charging and discharging performance of the nickel hydroxide covered by the certain amount of Er(OH)3 is also obviously improved; the discharge capacities of 1 C and 3 C at 65 DEG C are respectively 295.7 mAh / g and 290.3 mAh / g; the utility ratios of the active materials respectively reach 83 percent and 81 percent; and the optimal covering amount of Fr is 1.0-2.0 percent.

Description

Technical field: [0001] The invention relates to a preparation method of a Co-coated nickel hydroxide positive electrode material coated with a rare earth compound on the surface, and belongs to the field of materials. Background technique: [0002] With the aggravation of energy crisis and environmental pollution, the development of electric vehicles has attracted more and more attention. Metal hydride nickel-metal hydride secondary battery (Ni / MH) has become a popular choice for electric vehicles (EV) and hybrid vehicles ( The best power source for HEV). However, since automotive power batteries require higher energy density, power density, cycle life, high temperature resistance and fast charging capability, the microstructure characteristics, particle interface characteristics and the difference between oxidation and oxygen evolution potential of nickel hydroxide are constraints. Three key factors for the performance of power nickel metal hydride batteries. Therefore,...

Claims

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Application Information

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IPC IPC(8): H01M4/26H01M4/32H01M4/62
CPCY02E60/124Y02E60/10
Inventor 赫文秀张永强蒋文全张文广安胜利
Owner INNER MONGOLIA UNIV OF SCI & TECH
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