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Method for appraising sphere nickel fast charging and discharging performance

A technology of charge and discharge performance and spherical nickel, which is applied in the field of evaluating the rapid charge and discharge performance of spherical nickel used as a positive electrode material for secondary nickel-hydrogen/nickel-cadmium batteries, can solve problems such as long cycle, shorten judgment time and shorten incoming materials The effect of testing the inspection cycle and simplifying the operation steps

Inactive Publication Date: 2010-09-29
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for quickly and effectively evaluating the rapid charge and discharge performance of spherical nickel in order to overcome the shortcoming of the long period of the existing evaluation method for rapid charge and discharge performance of spherical nickel

Method used

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  • Method for appraising sphere nickel fast charging and discharging performance
  • Method for appraising sphere nickel fast charging and discharging performance
  • Method for appraising sphere nickel fast charging and discharging performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] This example is used to illustrate the method for evaluating the rapid charge and discharge performance of spherical nickel provided by the present invention.

[0017] Instrument: D / MAX2200PC X-ray powder diffractometer produced by Rigaku Corporation;

[0018] Instrument configuration and test conditions: copper X-ray source, wavelength λ=1.54056 angstroms, Cu / Kα1; the preferred power of the Cu target is 40 kV, 20 mA; graphite monochromator is used; the scan rate of the goniometer is 4° / min, the scanning range is 2θ=15°-65°, the scanning method is θ / 2θ linkage scanning; the scanning step is 0.02° / step; the divergence slit of the optical path is 1°, the anti-scattering slit is 10mm, The variable slit is automatically adjusted by the instrument, and the receiving slit is 0.3mm;

[0019] Instrument data processing software: MDI-JADE (5.0);

[0020] Spherical nickel sample: cadmium-added spherical nickel sample, numbered A (D03 cadmium-added type, Jiangmen Changyou Indust...

Embodiment 2-6

[0027] This group of examples is used to illustrate the method for evaluating the rapid charge and discharge performance of spherical nickel provided by the present invention.

[0028] Add cadmium spherical nickel sample B (SY-1 adds cadmium type, Xiamen Fangyuan Chemical Industry Co., Ltd.), C (D03 adds cadmium type, Jiangmen Changyou Industrial Co., Ltd.), D respectively according to the test method described in Example 1. (D03 cadmium-added type, Jiangmen Changyou Industrial Co., Ltd.), E (D03 cadmium-added type, Jiangmen Changyou Industrial Co., Ltd.) and F (SY-2 cadmium-added type, Xiamen Fangyuan Chemical Industry Co., Ltd.) XRD diffraction test , to obtain the FWHM of the sample 101 、d 001 , and evaluate the electrochemical performance of the spherical nickel sample according to the method described in Example 1. The diffraction pattern of the sample is obtained as figure 1 As shown in B, C, D, E, and F in Table 1, the measurement results are shown in B, C, D, E, and...

Embodiment 7-12

[0033] This group of examples is used to prepare batteries.

[0034] Preparation of positive electrode sheet

[0035] Weigh 42.5 parts by weight of spherical nickel samples A, B, C, D, E, F and 10 parts by weight of conductive agent nickel powder, 3.5 parts by weight of improver CoO, and 1 part by weight of binder polytetrafluoroethylene , 20 parts by weight of water mixed and stirred evenly to prepare positive electrode slurry, respectively coated on the foamed nickel mesh with drainage fluid, dried and calendered at 150 ° C to grow 200 mm, 30 mm wide, and 0.75 mm thick positive electrode sheet Z1, Z2 , Z3, Z4, Z5, Z6, wherein the contents of the positive electrode active material in the positive electrode sheets Z1, Z2, Z3, Z4, Z5, Z6 are all 3.75 grams.

[0036] Preparation of negative electrode sheet

[0037] Weigh 40 parts by weight of CdO powder, 10 parts by weight of Cd powder, and 25 parts by weight of water, mix and stir evenly to prepare negative electrode slurry, ...

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Abstract

The invention provides a method to appraise the ball nickel charge and discharge performance of positive material in secondary nickel-hydrogen / nickel-cadmium battery. The method includes: it gets the parameter of ball nickel crystal and sets the parameter field of ball nickel crystal; comparing the ball nickel crystal parameter to the setting ball nickel crystal parameter, if the getting value isin the range of setting value, the charge and discharge performance can satisfy the battery. The ball nickel crystal parameter includes diffraction maximums width value of at least one crystal side and the diffraction side distance of at least one crystal side. The method in invention can determine if the ball nickel charge and discharge good or bad quickly, it is especially proper for appraisingthe ball nickel material of factory.

Description

technical field [0001] The present invention relates to a method for evaluating the rapid charge and discharge performance of spherical nickel, more specifically to a method for evaluating the rapid charge and discharge performance of spherical nickel used as the positive electrode material of a secondary nickel-hydrogen / nickel-cadmium battery. Background technique [0002] Power tool batteries are currently one of the main application fields of nickel-metal hydride and nickel-cadmium secondary batteries, and fast charging and discharging capabilities are a basic requirement for power tool batteries. Spherical nickel (that is, spherical nickel hydroxide, usually β-crystal structure) is the main positive electrode active material used in nickel-metal hydride and nickel-cadmium secondary batteries. The rapid charge and discharge ability of spherical nickel directly affects the nickel-metal hydride , Nickel-cadmium secondary battery fast charge and discharge capacity. For manu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36G01R31/00
Inventor 李永胜
Owner BYD CO LTD
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