High-safety lithium ion battery and preparation method thereof
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A lithium-ion battery, high-safety technology, applied in the direction of secondary batteries, battery pack components, secondary battery repair/maintenance, etc., can solve problems such as safety hazards, mechanical abuse, thermal abuse, etc., to improve safety, Prevent positive and negative crosstalk and suppress thermal runaway effects
Active Publication Date: 2022-03-11
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST +1
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[0002] At present, although lithium-ion batteries are widely used and have broad prospects, their chemical characteristics and system composition determine that they are a potentially dangerous chemical power source, and there are mechanical, electrical and thermal abuses during use. and many other factors, have great potential safety hazards
Method used
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Embodiment 1
[0050] A preparation method of a high-safety lithium-ion battery, comprising the steps of:
[0051] S1. Preparation of positive pole piece: Lithium cobaltate, conductive agent SP, binder polyvinylidene fluoride and inorganic flame retardant component magnesium oxide are prepared into slurry according to the mass ratio of 95.5:3:1.5:5, coated and dried , rolling, and slitting to prepare the positive electrode sheet;
[0052] S2. Preparation of negative pole piece: mix 9g of graphite with 0.5g of conductive agent SP, then add 0.5g of PVDF and 40ml of NMP to prepare negative pole slurry, apply it on aluminum foil, and prepare negative pole piece by drying, rolling and cutting ;
[0053] S3. Preparation of electrolyte: The electrolyte solvent is made of EC, EMC, and DEC with a mass ratio of 1:1:1; the electrolyte is 1mol / L lithium hexafluorophosphate; 3% di Lithium fluorooxalate borate (LiDFOB), 3% ethylene sulfate (DTD), 5% ethoxypentafluorocyclotriphosphazene, 0.8‰ potassium p...
Embodiment 2
[0063] In this embodiment, lithium cobaltate, conductive agent SP, binder polyvinylidene fluoride, and inorganic flame retardant component magnesium oxide are configured according to the mass ratio of 95.5:3:1.5:1; except for the above matters, the same as the embodiment 1 The same method is used to manufacture lithium-ion batteries.
Embodiment 3
[0065] In this example, 1% of lithium difluorooxalate borate (LiDFOB), 1% of ethylene sulfate (DTD), 3% of ethoxylated pentafluorocyclotriphosphazene, 0.5‰ of all Potassium fluorobutanesulfonate;
[0066] Except for the above matters, a lithium ion battery was produced in the same manner as in Example 1.
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Abstract
The invention belongs to the technical field of batteries, and particularly relates to a high-safety lithium ion battery and a preparation method thereof. The battery comprises a shell and a battery cell, the battery cell comprises a positive pole piece, a diaphragm, a negative pole piece and an electrolyte; the positive pole piece contains an inorganic flame-retardant component, the diaphragm is composed of multiple layers, one side, close to the positive pole, of the base material is a coating composed of a polymer with a gel function and a fast ion conductor, and the polymer with the gel function contains a certain flame retardant; the electrolyte contains 0.1 to 0.8 wt% of a fluorine-containing flame retardant with a surfactant function, 0.1 to 3 wt% of a boron-containing additive, 0.1 to 3 wt% of a sulfur-containing additive and 1 to 5 wt% of a pentafluorocyclotriphosphazene additive. The battery has good safety characteristics of preventing overcharge, overdischarge, short circuit and the like, thermal runaway can be effectively inhibited, the safety of the battery is improved, meanwhile, the electrical performance of the battery is not influenced, and the cycle performance of the battery is facilitated.
Description
technical field [0001] The invention belongs to the technical field of batteries, in particular to a high-safety lithium-ion battery and a preparation method thereof. Background technique [0002] At present, although lithium-ion batteries are widely used and have broad prospects, their chemical characteristics and system composition determine that they are a potentially dangerous chemical power source, and there are mechanical, electrical and thermal abuses during use. And many other factors, have great security risks. [0003] In the prior art, the main measures to solve the safety problem of lithium-ion batteries include: increasing the internal resistance, reducing or cutting off the current; flame retardant; suppressing lithium dendrites; material optimization, etc. specific: [0004] 1) In terms of increasing internal resistance, reducing or cutting off the current, including coating a safety coating with chemical degradation between the current collector and the pos...
Claims
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