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Formation method of lithium ion secondary battery using lithium titanate as cathode

A technology of secondary battery and formation method, which is applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, non-aqueous electrolyte storage battery, etc., which can solve problems such as gas swelling, affecting battery capacity and cycle performance, and achieves guaranteed The effect of capacity and circulation, and good application prospects

Inactive Publication Date: 2010-06-16
SUZHOU PHYLION BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual use, overpotentials are likely to occur, causing the potential of the negative electrode of the lithium battery to drop below 1V, resulting in the decomposition of lithium titanate and the electrolyte to produce gas that has nowhere to be released, resulting in flatulence, which in turn affects the capacity and cycle performance of the battery.

Method used

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  • Formation method of lithium ion secondary battery using lithium titanate as cathode
  • Formation method of lithium ion secondary battery using lithium titanate as cathode

Examples

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Embodiment 1

[0016] Lithium manganate is used as the positive electrode active material, lithium titanate is used as the negative electrode active material, and the electrolyte LiPF 6 Dissolved in a mixed solution of ethylene carbonate (EC) / dimethyl carbonate (DMC) with a volume ratio of 1:1 to form an electrolyte, the concentration of the electrolyte is 1 mol / liter, and a battery is made, and the prepared battery Under the condition of a formation temperature of 15°C, it was charged at a constant current of 0.3C to 2.7V, and then charged at a constant voltage to the cut-off current to form a solid electrolyte interface film on the surface of the negative electrode material, then vacuum sealed, and then a cycle test was performed.

Embodiment 2

[0018] Lithium manganate is used as the positive electrode active material, lithium titanate is used as the negative electrode active material, and the electrolyte LiPF 6 Dissolved in a mixed solution of ethylene carbonate (EC) / dimethyl carbonate (DMC) with a volume ratio of 1:1 to form an electrolyte, the concentration of the electrolyte is 1 mol / liter, and a battery is made, and the prepared battery Under the condition of a formation temperature of 25°C, it was charged at a constant current of 0.3C to 2.7V, and then charged at a constant voltage to the cut-off current to form a solid electrolyte interface film on the surface of the negative electrode material, then vacuum sealed, and then a cycle test was performed.

Embodiment 3

[0020] Lithium manganate is used as the positive electrode active material, lithium titanate is used as the negative electrode active material, and the electrolyte LiPF 6 Dissolved in a mixed solution of ethylene carbonate (EC) / dimethyl carbonate (DMC) with a volume ratio of 1:1 to form an electrolyte, the concentration of the electrolyte is 1 mol / liter, and a battery is made, and the prepared battery Under the condition of formation temperature of 50°C, charge at 0.3C constant current to 2.7V, and then charge at constant voltage to cut-off current to form a solid electrolyte interface film on the surface of the negative electrode material, then vacuum seal it, and then conduct a cycle test.

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Abstract

The invention relates to a formation method of a battery, in particular to an opening formation method of a lithium ion secondary battery using lithium titanate as a cathode, and the method comprises the following steps: at a formation temperature of the lithium ion secondary battery using lithium titanate as the cathode, the charging process comprises large current constant-current charge to a charge cutoff voltage and a constant-voltage charge to a cutoff current, and a solid electrolyte interfacial film is formed on the surface of the cathode material, wherein the large current is 0.2 C to 3C; the charge cutoff voltage is 1.8V to 2.8V, the cutoff current is less than or equal to 0.05C, and the formation temperature of the lithium ion secondary battery is 15 DEG C to 60 DEG C. Aiming at the characters of the lithium ion secondary battery using lithium titanate as the cathode, the large current is adopted to charge in the formation process, thus forcing to form an SEI film on the surface of the lithium titanate cathode, and the generated gas is pumped, thus avoiding the gas bulging problem owning to reaction of the lithium titanate active material and electrolyte caused by over-potential in the using process of the lithium battery and ensuring the capacity and the cyclicity of the battery simultaneously.

Description

technical field [0001] The invention relates to a battery formation method, in particular to an opening formation method for a lithium ion secondary battery with lithium titanate as the negative electrode. Background technique [0002] Before the battery is used, it must be chemically formed in order to activate the active materials of the positive and negative electrodes of the battery, so that the battery can reach the best state of charge and discharge. The formation step of lithium-ion secondary batteries is an important stage in the manufacture of batteries. The formation is related to the quality of the battery's capacity, cycle life, and safety performance. Formation refers to the process of charging the battery several times before. There are mainly two ways of formation of the existing lithium-ion secondary batteries, sealed formation and open formation. Sealing formation is to seal the liquid injection hole after the electrolyte is injected, and then perform batt...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/44
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 吴晓东
Owner SUZHOU PHYLION BATTERY
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