Modified lignocellulose separator for lithium ion battery and its preparation method and application

A technology of lignocellulose and lithium-ion batteries, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., can solve problems such as high production costs, poor electrochemical performance of batteries, and cumbersome production techniques, and achieve stable Electrochemical properties, overcoming poor thermal stability, and cost-saving effects
CN112397850BActive Publication Date: 2022-04-05TONGJI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TONGJI UNIV
Publication Date
2022-04-05

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Abstract

The invention relates to a modified lignocellulose diaphragm for lithium ion batteries and its preparation method and application. The lignocellulose diaphragm is made of a natural wood film with a thickness of 30-300 μm, which is treated with a mixed lye and placed in a vacuum environment It is obtained by mixing lye and fully immersing the interior of the wood film and treating it at high temperature. Compared with the prior art, the lithium-ion battery separator based on natural lignocellulose prepared by the present invention not only has high ion conductivity, thermal stability, and excellent mechanical strength, but also has the advantages of low cost and abundant raw materials. The preparation method of the diaphragm is very simple, and the cut micron-level natural wood film can be obtained by one-step modification in a mixed solution of potassium hydroxide and sodium sulfite. This method greatly simplifies the preparation process, effectively reduces the cost, and is expected to realize green, low-cost, and large-scale application.
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Description

technical field

[0001] The invention relates to the technical field of energy storage devices, in particular to a modified lignocellulose separator for a lithium ion battery and a preparation method and application thereof. Background technique

[0002] Lithium-ion batteries mainly include positive and negative electrode materials, separators, electrolytes, etc. The main function of the separator is to avoid direct contact between the positive and negative electrodes and cause a short circuit, or even a battery explosion accident, which is an important part of the battery. To a certain extent, the quality of the separator determines the energy storage efficiency, thermal stability and safety of the battery. At present, the research on positive electrode materials and negative electrode materials is flourishing, but the separator, as a key component of the battery, has been studied relatively little. The development of new high-performance separators is the focus of comprehen...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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