A positive electrode for a nickel-hydrogen secondary battery, a preparation method thereof, and a nickel-hydrogen secondary battery

A secondary battery and positive electrode technology, applied in the field of new electrochemical energy storage, can solve the problems of limiting the development of nickel-metal hydride batteries, poor conductivity of positive electrodes, slow kinetics, etc., and achieve excellent cycle life, rate performance improvement, and promotion effects.

Active Publication Date: 2022-07-15
UNIV OF SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

However, the high cost of the anode catalyst and the Ni(OH) 2 Poor electrical conductivity of the positive electrode itself, slow charging and discharging kinetics, and unstable structure limit the development of nickel-metal hydride batteries.

Method used

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  • A positive electrode for a nickel-hydrogen secondary battery, a preparation method thereof, and a nickel-hydrogen secondary battery
  • A positive electrode for a nickel-hydrogen secondary battery, a preparation method thereof, and a nickel-hydrogen secondary battery
  • A positive electrode for a nickel-hydrogen secondary battery, a preparation method thereof, and a nickel-hydrogen secondary battery

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preparation example Construction

[0043] The present invention also provides a method for preparing the positive electrode for the above-mentioned nickel-hydrogen secondary battery, comprising the following steps:

[0044] A mixed solution of cobalt nitrate, nickel nitrate and sodium hypophosphite is used as the electrolyte, and a phosphorus-doped nickel-cobalt mixed positive electrode material layer is deposited on the surface of the positive electrode substrate by dynamic electrochemical deposition to obtain a positive electrode for a nickel-hydrogen secondary battery.

[0045] The invention adopts the dynamic electrochemical deposition method, that is, the cyclic voltammetry method to prepare the positive electrode. Wherein, a mixed solution formed by cobalt nitrate, nickel nitrate and sodium hypophosphite is used as the electrolyte. In the electrolyte, the concentration of cobalt nitrate is 0.001mol / L~10mol / L, preferably 0.001mol / L, 0.01mol / L, 0.1mol / L, 0.5mol / L, 1.0mol / L, 5mol / L , 10mol / L, or any value b...

Embodiment 1

[0070] Using foamed nickel as the working electrode, Ag / AgCl as the reference electrode, and platinum sheet as the counter electrode in a mixed solution of 0.1 mol / L cobalt nitrate, 0.1 mol / L nickel nitrate, and 0.05 mol / L sodium hypophosphite Electrodeposition is performed for 10 cycles, and the current-voltage curve during the deposition process is as follows figure 2 As shown, the deposition voltage is -1.2V to 0.2V, and the deposition current is in the range of -4mA to 2.5mA.

Embodiment 2

[0072] Using carbon cloth as the working electrode, Ag / AgCl as the reference electrode, and platinum sheet as the counter electrode in a mixed solution of 0.1mol / L cobalt nitrate, 0.2mol / L nickel nitrate, and 0.05mol / L sodium hypophosphite Electrodeposition was carried out for 10 cycles, and the current-voltage curve during the deposition process was the same as figure 2 Similarly, this method has no substrate dependence and is universal.

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Abstract

The invention provides a positive electrode for a nickel-hydrogen secondary battery, comprising a positive electrode substrate and a phosphorus-doped nickel-cobalt mixed positive electrode material layer compounded on the surface of the positive electrode substrate. The introduction of cobalt can improve Ni(OH) 2 The overall conductivity of the material can improve the utilization rate of the electrode material; it has a certain inhibitory effect on the formation of γ-NiOOH, thereby significantly improving the stability of the electrode material. In addition to promoting the conductivity and stability of electrode materials, the introduction of P also promotes the improvement of discharge voltage and specific capacity by the synergy and promotion of the three elements Ni, Co, and P.

Description

technical field [0001] The invention belongs to the technical field of novel electrochemical energy storage, and particularly relates to a positive electrode for a nickel-hydrogen secondary battery and a preparation method thereof, and a nickel-hydrogen secondary battery. Background technique [0002] With the depletion of fossil fuels and the increasing environmental pollution, the development of clean and renewable energy is crucial to the protection of the ecological environment. The key problem in the wide application of renewable energy such as solar energy and wind energy is that these clean energy sources are intermittent and unbalanced in time and space, so they cannot be directly integrated into the power grid for people to use, and must be assisted by certain energy storage devices. Therefore, it is particularly important for large-scale energy storage. Electrochemical energy storage systems, especially batteries, are considered to be one of the most widely used a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/1395H01M4/134H01M4/36H01M4/52H01M10/30
CPCH01M4/0404H01M4/1395H01M4/134H01M10/30H01M4/362H01M4/52Y02E60/10
Inventor 陈维孟亚寒
Owner UNIV OF SCI & TECH OF CHINA
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