A method for analyzing and classifying the thermal conductivity of electrode materials for lithium-ion batteries
A technology for lithium ion batteries and electrode materials, which is used in material thermal analysis, analysis materials, measurement devices, etc.
Active Publication Date: 2018-09-04
XIAMEN UNIV
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[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0019] 1) Li cannot be accurately calculated using the structure type I reported in the literature x CoO 2 thermal conductivity
[0020] Select the cathode material Li for lithium-ion batteries x CoO 2 (0figure 1 shown. From figure 1 It can be found that only when the value of x is relatively small (0.6<x<0.76), the theoretical calculation value and the experimental value can be in good agreement.
[0021] 2) Li cannot be accurately calculated using the structure type II reported in the literature x CoO 2 thermal conductivity
[0022] Select the cathode material Li for lithium-ion batteries x CoO 2 (0 figure 2 shown. From figure 2 It can be found from the above that when 0.76<x<0.9, the theoretical calculation value and the experimental result can only be consistent within a specific range of x.
[0023] 3) Li cannot be accurately calcul...
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The invention discloses a lithium ion battery electrode material thermal conductivity analysis and classification method, and relates to lithium ion batteries. The change of the lithium ion concentration in a lithium ion battery electrode material is x=0-1, wherein 0 represents that no lithium ion exists in the material, 1 represents that the electrode material is an electrode material without defects, and intermediate values represent that the electrode material is in the two states, and if the intermediate values are larger, the lithium ion concentration is larger; when the lithium ion concentration is changed from 0 to X[im], the structure is defined as a structure type I; when the lithium ion concentration is changed from X[im] to X[mp], the structure is defined as a structure type II; when the lithium ion concentration is changed from X[mp] to 1, the structure is defined as a structure type III; under different structure types, the corresponding thermal conductivity of the material in the whole process of lithium ion changing is calculated; the intersection points X[im] and X[mp] of the different structure types are found out, and a combined structure type is defined, the thermal conductivity corresponding to the corresponding lithium ion concentration section is taken out, and the relationship of the thermal conductivity of the lithium ion battery electrode material during the whole charging and discharging process with x is obtained.
Description
technical field [0001] The invention relates to lithium ion batteries, in particular to a method for analyzing and classifying the thermal conductivity of electrode materials of lithium ion batteries. Background technique [0002] Since Japan's Sony company developed lithium-ion batteries, it has attracted worldwide attention. This battery not only has a large capacity, but also can be used repeatedly. It is widely used in modern electronic devices and energy storage devices, such as laptops, mobile phones, electric cars etc. After entering the 21st century, the society not only has a greater demand for lithium-ion batteries in terms of quantity, but also puts forward higher requirements for the quality of batteries, such as high voltage, high energy density, and long service life. However, such a high-quality battery has certain potential safety hazards, and even the battery exploded during use. The safety of lithium-ion batteries is closely related to the thermal conduct...
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IPC IPC(8): G01N25/00
Inventor 郑金成任飞李晓军程浩王惠琼
Owner XIAMEN UNIV