Nickel-hydrogen battery anode material prepared from glucaric acid metal complex doped beta-Ni(OH)2 and method thereof

Abstract

The invention discloses a nickel-hydrogen battery anode material prepared from glucaric acid metal complex doped beta-Ni(OH)2, comprising an anode active substance, electric conductive agent and adhesive, wherein the anode active substance is formed by the glucaric acid metal complex and the beta-Ni(OH)2 at the mass percent of 1.5-13.5 percent. The method for preparing the nickel-hydrogen battery anode material comprises the following steps: synthetizing glucaric acid metal complex powder; uniformly mixing a glucaric acid metal complex and beta-Ni(OH)2 under the basic condition by a solution method so as to prepare anode active substance powder; uniformly mixing the anode active substance powder, the electric conductive agent and the adhesive to form powder slurry; and filling the powder slurry into a foam nickel base plate and pressing and drying the powder slurry to prepare a battery anode. The material has high integrated electrical properties, and a nickel-hydrogen battery prepared by the invention is improved in the capacity by 1 percent to 7 percent and the utilization ratio, the cycle life and the charging efficiency in a high temperature environment.

Description

technical field [0001] The invention relates to a nickel-metal hydride battery cathode material and a preparation method thereof, which is spherical β-Ni(OH) doped with a metal complex of glucaric acid 2 The prepared novel nickel-metal hydride battery cathode material belongs to the field of functional materials. Background technique [0002] Nickel-metal hydride alkaline batteries are also called nickel-metal hydride (Ni-MH) batteries. With the wide application of nickel-metal hydride batteries in mobile communications, personal electronic equipment, power tools and electric vehicles, the research on their positive electrode materials has also received great attention. more and more attention. [0003] The positive electrode of the nickel-hydrogen battery is made by uniformly mixing the positive electrode active material with nickel hydroxide as the main body, the conductive agent and the binder, and then forming the process. Nickel hydroxide has two structures of a phase ...

AI Technical Summary

Problems solved by technology

[0006] 1. The utilization rate and specific capacity of the active material are low, and the utilization rate of ordinary doped nickel hydroxide is not more than 85%;

[0007] 2. The oxygen evolution potential is low. During the charging process, especially when overcharging, excessive oxygen is precipitated on the positive electrode, causing the internal pressure of the battery to increase, reducing the performance of the negative electrode, and causing the battery to heat up;

[0008] 3. Poor high-current charging and discharging performance: dry powder has weak conductivity, large electronic internal resistance, and low battery discharge depth;

[0009] 4. The crystallite shape is not good, the crystallite size is large, and the crystallinity is high, which is not conducive to the transfer of charges and the diffusion of protons during the charging and discharging process, resulting in the formation of a large amount of γ-NiOOH, causing electrode distortion or short circuit;

[0010] 5. The small number of microstructural defects in nickel hydroxide results in poor wetting ability of the electrolyte, resulting in OH in the electrolyte - Cannot react with the protons in the inner layer;

[0011] 6. The content of Ni and Co in the nickel hydroxide electrode material is relatively large, and the manufacturing cost is relatively high;

However, the formed conductive network is incomplete and the adhesion is not strong, so it is easy to be damaged or fall off; at the same time, the complexity of the nickel hydroxide preparation process increases, resulting in an increase in the cost of the nickel hydroxide product

[0013] In summary, the positive electrode materials of alkaline rechargeable batteries are all β-Ni(OH) 2 , the mass specific capacity is low, the internal pressure is high when charging with high current, the battery heats up seriously, and the nickel electrode expands greatly; the discharge depth is low when discharging with high current, and the cycle life is short; the manufacturing cost is high

These shortcomings and deficiencies cannot meet the requirements of nickel-metal hydride batteries and high-capacity high-performance alkaline batteries, nor can they meet the conditions of high specific energy, high specific power, long cycle life, and low price required by electric tools and electric vehicles for batteries.

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