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Method for measuring powder body material electric conductivity and electric conductivity measuring apparatus suitable for the method

A measurement method and technology of powder materials, applied in the direction of material impedance, etc., can solve the problems of the influence of compaction density lithium ions, the first discharge efficiency of the material gram capacity and the unfavorable cycle performance, and achieve the effect of optimizing the electrode material formula.

Active Publication Date: 2008-12-17
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, excessive compaction density has a negative impact on the deintercalation process of lithium ions, and is also unfavorable to the performance of the material's gram capacity, first discharge efficiency and cycle performance.

Method used

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  • Method for measuring powder body material electric conductivity and electric conductivity measuring apparatus suitable for the method
  • Method for measuring powder body material electric conductivity and electric conductivity measuring apparatus suitable for the method
  • Method for measuring powder body material electric conductivity and electric conductivity measuring apparatus suitable for the method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] figure 1 An embodiment of the conductivity measuring device according to the invention is shown.

[0038] Such as figure 1 As shown, the conductivity measuring device comprises a powder container 1, an upper piston 2, a lower piston 3, a tablet press (i.e. the pressurizing device in the technical solution of the present invention, figure 1 Not shown in; pressurization range can be selected in 0-10MPa), DC resistance instrument (being the resistance measuring instrument in the technical scheme of the present invention, figure 1 not shown).

[0039] A straight cylindrical cavity is arranged in the powder container 1, and the cross section of the straight cylindrical cavity is circular; the cross sections of the upper piston 2 and the lower piston 3 are also circular; figure 1Among them, under the straight cylindrical cavity, there is a stepped hole in the powder container 1, and the radial dimension of the end of the lower piston 3 in contact with the powder to be meas...

Embodiment 2

[0050] image 3 A further embodiment of the conductivity measuring device according to the invention is shown.

[0051] Compared figure 1 and image 3 The difference between the conductivity measuring device and the first embodiment is that the ends of the upper piston 2 and the lower piston 3, which are far away from the measured powder, are conical in shape.

[0052] During the test, the two test terminals of the DC resistance meter are in contact with the respective tapered ends of the upper piston 2 and the lower piston 3, so that the distance between the test terminals of the DC resistance meter and the tapered ends of the upper piston 2 and the lower piston 3 is kept smaller. The contact resistance further ensures the measurement accuracy.

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Abstract

The invention provides a method for measuring the conductivity of the powder material. The method comprises the following steps: (a) keeping the powder material to be measured in a cylinder shape and applying a certain pressure P to the powder material until the shape of the cylinder powder body can be kept stable; (b) measuring the length L, the cross-sectional area S and the resistance R of thecylinder powder body; and (c) calculating the conductivity of powder material based on the formula that Sigma is equal to L divide (R multiply S). The invention further provides a device for measuring the conductivity, which comprises a powder container, two conductive pistons, a pressure device, and a resistance measuring device. By adopting the method and the device, the conductivity of the powder material to be measured in a pressurized state can be measured, thereby the conductivity of the powder material to be measured in an operating pressure can be quantitatively provided. The relationship of the conductivity of the powder material to be measured varying with the pressure P can be obtained through changing the pressure value of the powder material to be measured and measuring the conductivity thereof. The method facilitates the selection of the electrode material, the optimization of the electrode material formulation and the integrated design of the battery system.

Description

technical field [0001] The invention relates to a method and a device for measuring electrical conductivity, in particular to a method and a device for measuring the electrical conductivity of powder under pressure. Background technique [0002] At present, the anode materials of lithium-ion batteries in production practice basically use carbon materials, such as artificial graphite, natural graphite, acetylene black, mesophase pitch-based carbon microspheres (MCMB), petroleum coke, carbon fiber, pyrolytic resin carbon, etc. Lithium-ion batteries require that the negative electrode carbon material has good electrical conductivity. When selecting carbon material in the manufacturing process, it is often judged whether the electrical conductivity of the carbon material meets the requirements by measuring the electrical conductivity of the powdered carbon material. [0003] The usual way to measure the conductivity of powder materials is to press the powder into a sheet-like so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/02
Inventor 骆兆军毛焕宇肖斌胡领坡
Owner SHENZHEN BAK POWER BATTERY CO LTD
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