Method for establishing failure mechanism map of lithium ion battery high-capacity electrode material in chare-discharge process through dimensional analysis
A lithium-ion battery, charging and discharging process technology, applied in electrical digital data processing, special data processing applications, instruments, etc., to achieve the effect of a simple technical solution
Active Publication Date: 2016-06-08
XIANGTAN UNIV
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Problems solved by technology
[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a simple and efficient method for accurately establishing the failure mechanism diagram of the high-capacity electrode material of lithium-ion batteries in the process of charging and discharging through dimensional analysis, so as to solve the problems of the prior art. In this paper, complex experiments are used to explore the failure of high-capacity electrode materials in lithium-ion batteries during charging and discharging.
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Embodiment 1
[0035] Select thin film structure electrode material as the research object, consider its lithiation deformation process during charging, and study its failure mechanism diagram based on geometric parameters and material parameters during lithiation deformation process.
[0036] figure 1 It is a schematic diagram of the whole process of using dimensional analysis to establish a failure mechanism map of thin-film structure electrode materials during charging.
[0037] In the charging process of thin-film structure electrode materials, the destruction energy Γ under the condition of no failure phenomenon such as fracture or peeling between the active material and the substrate reflects the ability of the electrode material to resist failure. There are many parameters that affect the fracture and peeling of electrode materials. First, the main parameters related to the failure of electrode materials for thin-film structures are listed:
[0038] Γ=Γ(h 0 , E, σ Y , v, SOC)
[...
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The invention discloses a method for establishing a failure mechanism map of a lithium ion battery high-capacity electrode material in charge-discharge process through dimensional analysis. The method comprises the following steps: carrying out dimensional analysis on the main parameters involved in the charge-discharge process of the electrode material according to the pi theorem, and establishing a non-dimensional function relation; determining a specific expression of non-dimensional functions through finite element calculation and function fitting; and further establishing the failure mechanism map in the charge-discharge process of the electrode material. The method is simple and efficient; through the dimensional analysis, the failure mechanism map of the lithium ion battery high-capacity electrode material in the charge-discharge process is correctly established, so that the problem that the failure of the lithium ion battery high-capacity electrode material in the charge-discharge process is explored through complicated experiments in the prior art is solved; and a basis is provided for controlling the large volume change lithiation reaction and instructing to design and optimize the electrode structure, so that a basis is provided for fundamentally solving the failure problem of the electrode material.
Description
technical field [0001] The invention relates to a method for establishing a failure mechanism diagram of a lithium-ion battery high-capacity electrode material in a charging and discharging process through dimensional analysis; it belongs to the field of lithium-ion battery electrode materials. Background technique [0002] The establishment of material failure mechanism diagram plays an important guiding role in the design, processing and optimization of materials. With the rapid development of computer technology, the effective combination of finite element numerical simulation, computer simulation and processing experiments to study the failure behavior of lithium-ion battery high-capacity electrode materials during charging and discharging has become a current research hotspot. [0003] Lithium-ion batteries have many advantages such as high-voltage platform, high energy density, low self-discharge rate, long cycle life, no memory effect, and no pollution. They are curre...
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IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 马增胜王程鹏张晶高翔潘勇
Owner XIANGTAN UNIV