Preparation method and application of gel electrolyte cell
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A gel electrolyte and gel electrolyte technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of blocked lithium ion transmission channels, insufficient dispersion of copolymers, and lithium precipitation, etc. Chip interface, small impedance, slow rate effect
Active Publication Date: 2021-12-31
HUNAN LIFANG NEW ENERGY SCI & TECH
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[0006] One of the purposes of the present invention is to provide a method for preparing a gel electrolyte cell to solve the problem that the current gel electrolyte copolymer cannot fully Dispersed into the inside of the battery cell, resulting in the obstruction of lithium ion transmission channels, causing the problem of lithium ionization in the negative electrode
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[0034] The first aspect of the present invention provides a method for preparing a gel electrolyte cell, such as figure 1 shown, including the following steps:
[0035] S1. Add liquid gel electrolyte with a temperature ≤ 5°C into the battery cell, one packet;
[0036] S2. Place the sealed battery in an environment with a temperature ≤ 5°C for a standing time ≥ 6h;
[0037] S3. Carry out charging and forming in an environment with a temperature of ≤10°C, the forming pressure is 0.1-1.3MPa, and the charging current is ≤0.2C;
[0038] S4, degassing and sealing twice after the formation, standing still to carry out the polymerization reaction, converting the liquid gel electrolyte into a gel electrolyte, and completing the preparation of the battery cell.
[0039] Wherein, the above-mentioned liquid gel electrolyte includes a liquid electrolyte mother solution, at least two monomers and an initiator. The liquid electrolyte mother liquor is a conventional lithium-ion battery ele...
Embodiment 1
[0056] A preparation method of a gel electrolyte cell, comprising the following steps:
[0057] S1. Remove water from the cell to make the water content of the cell pass the test, then place the cell and the liquid gel electrolyte in an environment of -30-5°C for a standing time of ≥1 hour; then put the liquid gel electrolyte Add the gel electrolyte into the cell, one packet;
[0058] S2. After one letter, place the battery core in an environment of -30~5℃, and the standing time is ≥6h;
[0059] S3. Carry out charging and formation under the environment of -30~10℃, the formation pressure is 0.1~1.3MPa, and the charging current≤0.2C;
[0060] S4, degassing and sealing twice after the formation, standing still to carry out the polymerization reaction, the ambient temperature of the polymerization reaction is 20-90°C, the pressure is 0.15-1.5MPa, and the time is 0.5-100h, so as to transform the liquid gel electrolyte For the gel electrolyte, the preparation of the cell is compl...
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Abstract
The invention provides a preparation method and application of a gel electrolyte cell, and the preparation method comprises the following steps: S1, adding a liquid gel electrolyte with the temperature of less than or equal to 5 DEG C into the cell, and sealing primarily; S2, placing the primarily sealed battery cell in an environment with the temperature of less than or equal to 5 DEG C, and standing for more than or equal to 6 hours; S3, conducting charging formation in the environment with the temperature smaller than or equal to 10 DEG C, wherein the formation pressure ranges from 0.1 MPa to 1.3 MPa, and the charging current is smaller than or equal to 0.2 C; and S4, carrying out degassing and secondary sealing after formation, carrying out standing for a polymerization reaction, converting the liquid gel electrolyte into gel electrolyte, and completing preparation of the battery cell. Compared with the prior art, the rate of the copolymerization reaction is slowed down through low temperature, so that the liquid electrolyte fully infiltrates the pole piece and the diaphragm before being converted into gel, thereby solving the problems that the copolymer of the existing gel electrolyte cannot be fully dispersed into the battery cell before being polymerized, so that a lithium ion transmission channel is blocked, and local lithium precipitation of the negative electrode is caused.
Description
technical field [0001] The invention relates to the field of lithium batteries, in particular to a preparation method and application of a gel electrolyte cell. Background technique [0002] Lithium-ion batteries can be roughly divided into liquid lithium-ion batteries, gel electrolyte lithium batteries, and solid-state batteries according to the type of electrolyte. Liquid lithium-ion batteries are widely used in people's daily life because of their fast lithium ion migration rate, high voltage platform, high energy density, and small self-discharge. However, in recent years, due to the potential safety hazards of leakage and corrosion of the liquid electrolyte, under the influence of high temperature and high pressure, external force extrusion, overcharging and other factors, safety accidents have occurred frequently. Compared with liquid lithium-ion batteries, solid-state batteries use solid-state electrolytes to completely replace liquid electrolytes, completely avoidin...
Claims
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