Liquid injection method of lithium-ion power battery

A power battery and lithium-ion technology, which is applied in the field of lithium-ion power batteries, can solve the problems of unfavorable high-power lithium-ion power batteries, and achieve the effects of improving high-temperature storage performance, prolonging calendar life, and ensuring production efficiency

Inactive Publication Date: 2012-08-01
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is even more unfavorable for high-power lithium-ion power batteries

Method used

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  • Liquid injection method of lithium-ion power battery
  • Liquid injection method of lithium-ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of the cathode sheet: the cathode active material LiMn 2 o 4 (Lithium manganese oxide), conductive agent Super-P (conductive carbon) and bonding PVDF (polyvinylidene fluoride) are added to the solvent N-methylpyrrolidone (NMP) according to the mass ratio of 95.0:2.7:2.3 and mixed and stirred evenly to obtain The slurry with a certain fluidity is coated on both sides of the 16um thick metal aluminum foil, and dried into a pole piece with a certain degree of softness.

[0031]Preparation of the anode electrode sheet: artificial graphite is used as the anode active material, carbon powder (Super-P) is used as the conductive agent, styrene-butadiene rubber (SBR) is used as the binder, and sodium carboxymethyl cellulose (CMC) is used as the thickener agent; the above-mentioned anode active material, conductive agent, binder and thickener are added to the solvent deionized water with a mass ratio of 95:2:2:1 and mixed evenly to obtain a fluid anode slurry, and th...

Embodiment 2

[0041] Different from Example 1 is the preparation of electrolyte:

[0042] Preparation of Electrolyte E1:

[0043] Mix ethylene carbonate (EC), propylene carbonate (PC) and dimethyl carbonate (DMC) uniformly in a mass ratio of 3:3:4 to obtain a mixed solvent, and then add lithium tetrafluoroborate (LiBF 4 ), and lithium tetrafluoroborate (LiBF 4 ) concentration is 1.2M, then add high-temperature additive ethylene carbonate (VEC), ethylene carbonate (VEC) accounts for 1% of the total mass of the electrolyte E1.

[0044] Preparation of Electrolyte E2:

[0045] Mix ethylene carbonate (EC), propylene carbonate (PC) and diethyl carbonate (DMC) in a mass ratio of 3:3:4 to obtain a mixed solvent, and then add lithium tetrafluoroborate (LiBF 4 ), and lithium tetrafluoroborate (LiBF 4 ) concentration is 1.2M, then add high-temperature additive ethylene carbonate (VEC), ethylene carbonate (VEC) accounts for 15% of the total mass of the electrolyte E1.

[0046] In addition, the inj...

Embodiment 3

[0050] Different from Example 1 is the preparation of electrolyte:

[0051] Preparation of Electrolyte E1:

[0052] Mix ethylene carbonate (EC), propylene carbonate (PC) and ethyl methyl carbonate (EMC) uniformly in a mass ratio of 3:3:4 to obtain a mixed solvent, then add lithium bisoxalate borate (LiBOB) and make the bis The concentration of lithium oxalate borate (LiBOB) is 0.8M, and then high-temperature additive ethylene carbonate (VEC) is added, and ethylene carbonate (VEC) accounts for 0.5% of the total mass of the electrolyte E1.

[0053] Preparation of Electrolyte E2:

[0054] Mix ethylene carbonate (EC), propylene carbonate (PC) and ethyl methyl carbonate (EMC) uniformly in a mass ratio of 3:3:4 to obtain a mixed solvent, then add lithium bisoxalate borate (LiBOB) and make the bis The concentration of lithium oxalate borate (LiBOB) is 0.8M, and then the high-temperature additive ethylene carbonate (VEC) is added, and ethylene carbonate (VEC) accounts for 25% of the...

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Abstract

The invention belongs to the technical field of the lithium-ion power battery, and particularly relates to a liquid injection method of a lithium-ion power battery. The liquid injection method of the lithium-ion power battery comprises the following steps of: step one, injecting a liquid for the first time, putting an electrical core into a packaging shell, and injecting an electrolyte E1 containing a high-temperature additive A1 to carry out formation, air exhaust and volume testing; and step two, injecting a liquid for the second time, injecting an electrolyte E2 containing a high-temperature additive A2 after the volume testing, and then testing the voltage, the internal resistance and the K value of the battery. Compared with the prior art, the liquid injection method of the lithium-ion power battery provided by the invention utilizes electrochemical characteristics of the high-temperature additives containing functional groups of olefin and a two-time liquid injection mode to adjust the content of the high-temperature additives of the two-time injection liquid. The liquid injection method of the lithium-ion power battery not only prevents a compact SEI film from forming at the time of the initial charging, but also retains higher concentration additives in the normal use process of the electrical core. Under the condition of not enhancing the internal resistance of the electrical core, the high temperature storage performance of the battery is improved, and the service life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion power batteries. More specifically, the invention relates to a liquid injection method for lithium-ion power batteries that can not only maintain the power performance of the battery, but also prolong the service life of the battery. Background technique [0002] For high-power lithium-ion power batteries, low DC resistance (DCR) or high power density and long calendar life are two extremely important properties. We usually use accelerated tests to predict the calendar life of batteries, which is what we often call high-temperature storage experiments, and predict the calendar life of batteries at room temperature based on the performance decay trend of batteries during high-temperature storage. Previous research work has shown that the performance of the battery cell tends to attenuate severely in the early stage of storage, and tends to gradually level off in the later stage. Therefore, in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/36
CPCY02E60/12Y02E60/10
Inventor 邹武元金婧
Owner NINGDE AMPEREX TECH
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