Anti-overcharging lithium battery electrolyte, lithium battery and preparation method of lithium battery

A lithium battery, anti-overcharge technology, applied in the manufacture of electrolyte batteries, lithium batteries, secondary batteries, etc., can solve problems such as heat diffusion, battery performance degradation, battery short circuit, etc., to reduce side reactions, slow down speed, increase The effect of moving distance

Inactive Publication Date: 2018-11-13
GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the positive electrode potential is too high, it is easy to oxidize the non-aqueous organic solvent in the electrolyte, but the heat released by oxidizing the non-aqueous solvent during overcharging is far greater than the heat released by conventional charging and discharging; and when the overcharging reaches a certain level, the surface of the negative electrode will Lithium deposition occurs, which will cause the performance of the battery to decline sharply. In severe cases, problems such as large-scale diffusion of heat and internal short circuit of the battery will occur, which increases the possibility of battery fire and explosion.

Method used

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  • Anti-overcharging lithium battery electrolyte, lithium battery and preparation method of lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] ①When coating the battery, the density of one side is 22mg / cm 2 ;

[0036] ②Complete rolling and die-cutting according to the production process of the battery cell;

[0037] ③The laminate uses (16+4)μm ceramic-coated non-woven diaphragm;

[0038] ④ Carry out spot welding packaging and baking according to the cell production process;

[0039] ⑤Electrolyte preparation:

[0040] The electrolyte uses 1.1mol / L lithium hexafluorophosphate as the solute, EC, EMC, and DMC as the organic solvent at a volume ratio of 1:1:1, and adds biphenyl (1.5%), a derivative of benzene, and rutin (0.02%), a flavonoid compound. , and flame retardant hexamethoxycyclotriphosphazene (0.5%) as additives;

[0041] ⑥Inject the above-mentioned electrolyte into the baked cell, and complete the production of the cell according to the process.

Embodiment 2

[0043] ①When coating the battery, the density of one side is 22mg / cm 2 ;

[0044] ②Complete rolling and die-cutting according to the production process of the battery cell;

[0045] ③The laminate uses (16+4)μm ceramic-coated non-woven diaphragm;

[0046] ④ Carry out spot welding packaging and baking according to the cell production process;

[0047] ⑤Electrolyte preparation:

[0048] The electrolyte uses 1.1mol / L lithium hexafluorophosphate as the solute, and a mixture of EC, EMC, and DMC with a volume ratio of 1:1:1 as the organic solvent, and adds biphenyl (1.5%), a derivative of benzene, and rutin ( 0.04%), and flame retardant hexamethoxycyclotriphosphazene (1%) as additives;

[0049] ⑥Inject the above-mentioned electrolyte into the baked cell, and complete the production of the cell according to the process.

Embodiment 3

[0051] ①When coating the battery, the density of one side is 22mg / cm 2 ;

[0052] ②Complete rolling and die-cutting according to the production process of the battery cell;

[0053] ③The laminate uses (16+4)μm ceramic-coated non-woven diaphragm;

[0054] ④ Carry out spot welding packaging and baking according to the cell production process;

[0055] ⑤Electrolyte preparation:

[0056] The electrolyte uses 1.1mol / L lithium hexafluorophosphate as the solute, EC, EMC, and DMC as the organic solvent at a ratio of 1:1:1, and adds benzene derivatives biphenyl (1.5%), flavonoids rutin (0.05%), And flame retardant hexamethoxycyclotriphosphazene (1.5%) as additive;

[0057] ⑥Inject the above-mentioned electrolyte into the baked cell, and complete the production of the cell according to the process.

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Abstract

The invention discloses anti-overcharging lithium battery electrolyte, a lithium battery and a preparation method of the lithium battery. The anti-overcharging lithium battery electrolyte is preparedfrom a mixed solution which is prepared from a solute and an organic solvent and of which the concentration is 0.5 to 1.5 mol/L, an overcharging additive which accounts for 0.1 to 5 percent by mass ofthe mass sum of the solute and the organic solvent, 0.01 to 5 percent of a flavonoid compound and 0.1 to 5 percent of a flame retardant. The preparation method of the lithium battery comprises the following steps: coating a battery under the situation that the surface density of a single surface is 20 to 30 mg/cm<2> during coating of the battery; stacking ceramic coating non-woven cloth diaphragms of which the size is 15 to 40 mum for use; using the anti-overcharging lithium battery electrolyte. According to the anti-overcharging lithium battery electrolyte, the lithium battery and the preparation method of the lithium battery, disclosed by the invention, by increasing the surface density, displacement distance of lithium ions is increased, impedance of a battery cell is properly increased, side effects of a positive electrode plate during a thermal runaway process can be reduced, the runaway speed of electrode plates can be slowed down, and the safety performance of the battery cellcan be increased.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an electrolyte solution for an anti-overcharge lithium battery, a lithium battery, and a preparation method for the lithium battery. Background technique [0002] When the lithium-ion battery is overcharged, the positive and negative electrodes of the lithium-ion battery will be overloaded, so a series of side reactions will occur. If the positive electrode potential is too high, it is easy to oxidize the non-aqueous organic solvent in the electrolyte, but the heat released by oxidizing the non-aqueous solvent during overcharging is far greater than the heat released by conventional charging and discharging; and when the overcharging reaches a certain level, the surface of the negative electrode will Lithium deposition occurs, which will cause the performance of the battery to decline sharply. In severe cases, problems such as large-scale diffusion of heat and internal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42H01M2/16H01M10/052H01M10/058
CPCH01M10/052H01M10/0567H01M10/058H01M10/4235H01M50/449Y02E60/10Y02P70/50
Inventor 覃关键胡立平王兆科段亮李福桥
Owner GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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