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Method for evaluating electrochemical performance of laminar structure lithium cobalt oxide

A technology of lithium cobalt oxide and layered structure, which is applied in the field of evaluating the electrochemical performance of layered structure lithium cobalt oxide, can solve the problems of cumbersome inspection methods, shorten the inspection cycle, save manpower and material resources, and shorten the inspection time Effect

Inactive Publication Date: 2011-08-17
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the invention is to overcome the existing layered structure LiCoO 2 The shortcoming of the evaluation method of electrochemical performance is that the inspection method is cumbersome, and a simple inspection method is provided to evaluate the layered structure LiCoO 2 Methods for Electrochemical Performance

Method used

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  • Method for evaluating electrochemical performance of laminar structure lithium cobalt oxide
  • Method for evaluating electrochemical performance of laminar structure lithium cobalt oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Instrument: D / MAX2200PC X-ray powder diffractometer produced by Rigaku Corporation;

[0036] Instrument configuration and test conditions: Copper X-ray source, wavelength λ=1.54056 Angstroms, Cu / Kα1, Cu target power is 40 kV, current is 20 mA; graphite monochromator is used; scan rate of goniometer It is 6 degrees / minute, the scanning range is 2θ=10°-80°, the scanning mode is θ / 2θ linked scanning; the scanning step diameter is 0.02° / step; the light path divergence slit is 1°, and the anti-scatter slit is 10 mm , The variable slit is automatically adjusted by the instrument, and the receiving slit is 0.3 mm;

[0037] The instrument data processing software is: MDI-JADE (5.0);

[0038] Layered structure LiCoO 2 Sample: No. A.

[0039] Specific steps:

[0040] 1. Preparation of the sample to be tested: Take about 5 grams of sample A to be tested and stir evenly. Take a standard etched glass sample holder (groove size: 20 mm × 18 mm × 0.5 mm), first fill and compact the powder sam...

Embodiment 2-6

[0048] According to the method described in Example 1, the layered structure lithium cobalt oxide samples B, C, D, E, and F were subjected to XRD diffraction tests to obtain the layer spacing d 003 , D 006 , D 110 Value, relative intensity value of diffraction peak (I 104 / I 003 ), the unit cell parameter c / a value and observe the diffraction peaks, as well as the split between the 006 and 012 diffraction peaks and between the 018 and 110 diffraction peaks, and compare samples B, C, D according to the method described in Example 1. The electrochemical performance of, E and F are evaluated. The diffraction patterns of samples B, C, D, E and F are as follows figure 1 As shown in B, C, D, E, and F, the results are listed in Table 1.

[0049] Table 1

[0050]

[0051] From the results in Table 1 above, it can be seen that the 006 crystal plane diffraction peak spacing of sample C is d 006 The value is 2.3398 angstroms, which is not within the range of the set parameters; the distance ...

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Abstract

The invention provides a method used for evaluating the electrochemical properties of laminated structure lithium cobalt oxide, which comprises the steps as follows: (A) an X-ray powder diffraction method is adopted to measure the parameter value of a laminated structure lithium cobalt oxide crystal; (B) the parameter value range of the laminated structure lithium cobalt oxide crystal is set; and(C) whether the parameter value of the laminated structure lithium cobalt oxide crystal is arranged within the set parameter value range is judged; when the parameter value of the measured laminated structure lithium cobalt oxide crystal is arranged within the corresponding set parameter value range, the electrochemical properties of the laminated structure lithium cobalt oxide can meet the requirement of the battery. The method provided by the invention simplifies the operation steps of evaluating the electrochemical properties of the laminated structure lithium cobalt oxide and shortens thedetection time.

Description

Technical field [0001] The invention relates to a method for evaluating the electrochemical performance of a layered structure lithium cobalt oxide. Background technique [0002] Lithium Cobalt Oxide (LiCoO 2 ) There are three common crystal structures, namely, α-NaFeO 2 LiCoO with two-dimensional layered structure 2 , Spinel structure of LT-LiCoO 2 LiCoO with rock salt phase structure 2 . [0003] Layered LiCoO 2 It has good electrochemical activity and is currently the main cathode active material for commercial rechargeable lithium-ion batteries. Its electrochemical performance directly determines or indirectly affects the capacity, cycle life and charge-discharge characteristics of rechargeable lithium-ion batteries. Electrochemical performance. [0004] For battery manufacturers, when producing secondary lithium-ion batteries for mobile phones, they should accurately understand and evaluate the layered structure of LiCoO used as the battery's positive electrode active material....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36G01N23/207
Inventor 李永胜
Owner BYD CO LTD
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