Nickel battery positive active material and preparation method thereof and nickel-metal hydride battery

A positive electrode active material and nickel battery technology, which is applied to nickel storage batteries, battery electrodes, alkaline storage battery electrodes, etc., can solve the problems of poor battery capacity and high temperature performance, complicated preparation methods, etc., and achieve simple preparation methods, guaranteed capacity and high temperature performance, the effect of weakening the self-discharge process

Inactive Publication Date: 2012-10-31
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problems that the nickel-metal hydride battery in the prior art has an internal self-discharge process, resulting in poor battery capacity and high temperature performance, and complicated preparation methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The preparation method of the positive electrode active material of the nickel battery comprises the following steps: firstly dispersing spherical nickel hydroxide in water, then adding calcium hydroxide and dispersing evenly, heating the mixed system under stirring; filtering the mixed system and filtering the filter residue Baking is carried out in a carbon dioxide environment to obtain the positive electrode active material of the nickel battery.

[0015] In the present invention, the spherical nickel is firstly coated by the incompletely dissolved solid calcium hydroxide particles in the mixing system, and then the calcium hydroxide dissolved in water is slowly precipitated during the heating process to continue coating the spherical nickel, thereby realizing the spherical nickel Dense coating of nickel surface, finally in CO 2 Calcium hydroxide is converted into calcium carbonate by baking in the environment, so as to obtain the positive electrode active material o...

Embodiment 1

[0027] (1) Preparation of positive electrode active material

[0028] Put 100 parts by weight of commercially available spherical nickel (average particle size of 15um) into 100 parts by weight of water, stir for 5 minutes, add 0.5 parts by weight of calcium hydroxide (average particle size of 0.05um), heat to 90°C, and stir for 2 hours , washed and filtered, and baked at 60° C. for 6 hours in a carbon dioxide environment to obtain the positive electrode active material S1 of this embodiment.

[0029] (2) Preparation of positive electrode

[0030] Take 100 parts by weight of positive electrode active material S1, 10 parts by weight of PTFE, add 5wt% of cobaltous oxide as a conductive agent, add 30 parts by weight of water, stir well, and apply the paste evenly until the surface density is 380g / m 2 On the foamed nickel, the surface density is 400g / m 2 The positive electrode sheet, the size is 10cm*10cm.

[0031] (3) Preparation of negative electrode

[0032] Take LaNi 5 Al...

Embodiment 2

[0036] The same steps as in Example 1 were used to prepare the nickel battery positive electrode active material S2 and the nickel hydrogen battery S22, the difference being:

[0037] In step (1), put 100 parts by weight of commercially available spherical nickel (with an average particle size of 15um) into 50 parts by weight of water, stir for 10 minutes, add 0.5 parts by weight of calcium hydroxide (with an average particle size of 0.1um), and heat to Stir at 80° C. for 3 hours, wash and filter, and bake at 60° C. for 6 hours in a carbon dioxide environment to obtain the positive electrode active material S2 of this embodiment.

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Abstract

The invention provides a nickel battery positive active material. The nickel battery positive active material comprises a core and a dense layer covering the core, wherein the core is spherical nickel hydroxide, and the dense layer is calcium carbonate. The invention further provides a preparation method of the nickel battery positive active material and a nickel-metal hydride battery containing the nickel battery positive active material. The nickel battery positive active material is applied to the nickel-metal hydride battery, can effectively weaken the self-discharge process inside the battery, and ensures the capacity and high-temperature performance of the battery. The preparation method of the nickel battery positive active material provided by the invention is simple and easy to implement.

Description

technical field [0001] The invention belongs to the field of nickel batteries, and in particular relates to a nickel battery cathode active material, a preparation method thereof and a nickel hydrogen battery. Background technique [0002] Ni-MH battery is an alternative product of traditional Ni-Cd battery. The main difference between Ni-MH battery and Ni-Cd battery is that Ni-MH battery uses high-energy hydrogen storage alloy as the negative electrode, which has greater energy and no longer uses toxic separators to avoid heavy metals. The pollution problem caused by elements to the environment belongs to the environmental protection battery. [0003] A nickel-metal hydride battery generally includes a battery case, an electrode group sealed in the battery case, and an alkaline electrolyte. The electrode group includes a positive electrode, a negative electrode and a separator. Among them, the positive electrode active material generally used in the positive electrode is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/26H01M10/30
CPCY02E60/124Y02E60/10
Inventor 谢红波
Owner BYD CO LTD
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