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A diaphragm and battery technology, applied in the field of diaphragms and batteries, can solve the problems of battery performance degradation, electrolyte viscosity increase, etc.
Pending Publication Date: 2021-10-15
ZHUHAI COSMX BATTERY CO LTD
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Problems solved by technology
[0003] The embodiment of the present invention provides a diaphragm and a battery to solve the problem that the existing method of directly adding a flame retardant to the electrolyte will greatly increase the viscosity of the electrolyte, resulting in a decrease in the performance of the battery
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preparation example Construction
[0044] see figure 2 , figure 2 It is a flowchart of the preparation method of the diaphragm provided in the embodiment of the present application. The preparation method of this membrane comprises:
[0045] Step 201, adding the polymer into the solvent and heating, and stirring after the polymer is dissolved to obtain a first solution, wherein the melting point temperature or viscous flow temperature of the polymer is lower than the thermal failure critical temperature of the diaphragm;
[0046] Step 202, adding a free radical scavenger into the solvent and stirring to obtain a second solution, wherein the free radical scavenger is 2,2-diphenyl-1-trinitrophenylhydrazine, p-benzoquinone, tetramethyl At least one of benzoquinone, 2-methyl-2-nitrosomethane and phenyl-N-tert-butylnitrone;
[0047] Step 203, adding the second solution to the rapidly stirred first solution to obtain a third solution of polymer-coated radical scavenger;
[0048] Step 204, adding the acid amide ...
Embodiment 1
[0065] A conventional separator (that is, the separator body not coated with a flame-retardant coating), positive electrode sheet, and negative electrode sheet is wound into a battery. The pass rate of the security test is 40%.
Embodiment 2
[0067] Heat polyethylene in xylene to 120°C to dissolve at a concentration of 2% to obtain the first solution, and stir at high speed to dissolve 2,2-diphenyl-1-trinitrophenylhydrazine in the xylene solution, Obtain the second solution; add the second solution to the rapidly stirred first solution to obtain the third solution of the polymer-coated free radical scavenger, stir at a low speed, then add the acid amide, evaporate the solvent, and finally obtain the polyethylene-coated solution The free radical scavenger small particles; the small particles are dispersed in the CMC solution, evenly coated on the separator, and the final separator is prepared, and the positive electrode sheet and the negative electrode sheet are wound into a battery. The pass rate of the security test is 100%.
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Abstract
The invention discloses a diaphragm and a battery, and relates to the technical field of lithium ion batteries. The diaphragm comprises a diaphragm body and a flame retardant coating coated on the diaphragm body, wherein the flame-retardant coating comprises a free radical capturing agent and a polymer wrapping the free radical capturing agent; the free radical capturing agent is at least one of 2, 2-diphenyl-1-trinitrophenylhydrazine, p-benzoquinone, tetramethyl benzoquinone, 2-methyl-2-nitrosomethane and phenyl-N-tert-butyl nitrone, and the melting point temperature or viscous flow temperature of the polymer is lower than a thermal failure critical temperature of the diaphragm. Therefore, when the temperature of the battery is higher, the polymer wrapping the outer layer of the free radical capturing agent is melted at a high temperature, so that the free radical capturing agent is fused with the electrolyte, and oxygen free radicals generated by the decomposition of the electrolyte are captured, and the explosion of the battery is avoided.
Description
technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a diaphragm and a battery. Background technique [0002] Due to the advantages of high energy density, low self-discharge, and no memory effect, lithium-ion batteries are widely used in mobile phones, tablets, and power industries. When the lithium-ion battery is abused during use, the electrolyte of the lithium-ion battery will decompose a large amount of gas, causing the battery to explode. To solve this problem, in the prior art, a flame retardant is usually directly added to the electrolyte, which can release free radicals under high temperature conditions and capture oxygen free radicals generated by the decomposition of the electrolyte, thereby solving the problem of battery explosion . However, in this way, a large amount of flame retardant is required, which will greatly increase the viscosity of the electrolyte, resulting in a decrease in the performance ...
Claims
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Application Information
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