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Formation floating charge method for lithium battery with Li4Ti5O12 negative electrode

A technology of lithium battery and lithium titanate, applied in secondary battery charging/discharging, secondary battery, electrochemical generator, etc. Problems such as high-temperature cycle deviation can be achieved to promote application development, improve cycle and high-temperature performance, and reduce costs

Inactive Publication Date: 2016-12-21
SICHUAN JIANXING LITHIUM BATTERY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The above-mentioned patented methods all have advantages and uses, but the above-mentioned methods have higher requirements on the purity of electrolyte additives and solvents; through the reproduction of the high-voltage formation process, the experimental data reflects the deviation of the high-temperature cycle performance of the battery and the large thickness change rate; through the reproduction Patented (patent number: CN 103259048A) process, the experimental data reflects the high temperature cycle deviation of the battery and the large thickness change

Method used

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  • Formation floating charge method for lithium battery with Li4Ti5O12 negative electrode

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Experimental program
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Effect test

Embodiment 1

[0023] A lithium titanate negative electrode lithium battery formation float charging method, with nickel cobalt lithium manganese oxide as the positive electrode, with lithium titanate as the negative electrode:

[0024] (1) Formation: At 20°C, charge the lithium titanate negative electrode lithium battery with a constant current of 0.05C to a cut-off voltage of 2.7V, and then charge at a constant voltage to a cut-off current of 0.01C;

[0025] (2) One-time activation: at 50°C, activate the lithium titanate negative electrode lithium battery at high temperature for 72 hours, let it stand for 5 hours, and vacuum pump at a vacuum degree of -0.08MPa;

[0026] (3) Floating charge: The lithium titanate negative electrode lithium battery is charged with a constant current to a cut-off voltage of 2.7V by alternating cycles of small current and micro current, and the number of alternating cycles is 50 times. The small current is 0.05C, and the micro current A current of 0.005C;

[0...

Embodiment 2

[0029] A lithium titanate negative electrode lithium battery formation float charging method, with nickel cobalt lithium manganese oxide as the positive electrode, with lithium titanate as the negative electrode:

[0030] (1) Formation: At 50°C, charge the lithium titanate negative electrode lithium battery with a constant current to a cut-off voltage of 2.7V at a current of 1C, and then charge at a constant voltage to a cut-off current of 0.03C;

[0031] (2) One-time activation: at 80°C, activate the lithium titanate negative electrode lithium battery at high temperature for 24 hours, let it stand for 1 hour, and vacuum pump at a vacuum degree of -0.1MPa;

[0032] (3) Floating charge: at 50°C, the lithium titanate negative electrode lithium battery is charged with a constant current to a cut-off voltage of 2.7V at 50°C with alternating cycles of small current and micro current, the number of alternating cycles is 200, and the small current is 0.5C The current, the micro curre...

Embodiment 3

[0035] A lithium titanate negative electrode lithium battery formation float charging method, with nickel cobalt lithium manganese oxide as the positive electrode, with lithium titanate as the negative electrode:

[0036] (1) Formation: At 38°C, charge the lithium titanate negative electrode lithium battery with a constant current of 0.4C to a cut-off voltage of 2.7V, and then charge at a constant voltage to a cut-off current of 0.02C;

[0037] (2) One-time activation: at 65°C, activate the lithium titanate negative electrode lithium battery at high temperature for 36 hours, let it stand for 2 hours, and vacuum pump at a vacuum degree of -0.06MPa;

[0038] (3) Floating charge: at 38°C, the lithium titanate negative electrode lithium battery is charged with a constant current to a cut-off voltage of 2.7V at 38°C with a small current and a small current alternating cycle, the number of alternating cycles is 100, and the small current is 0.2C The current, the micro current is the...

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Abstract

The invention relates to the technical field of a lithium battery, in particular to a formation floating charge method for a lithium battery with a Li4Ti5O12 negative electrode. The formation floating charge method comprises the following steps of (1) formation, in which the lithium battery with the Li4Ti5O12 negative electrode is charged with a constant current of 0.05-1C to a cutoff voltage and then is charged with a constant voltage to a cutoff current; (2) primary activation, in which the lithium battery with the Li4Ti5O12 negative electrode is activated in a high-temperature of 50-80 DEG C for 24-72 hours and is allowed to be stood, and vacuum pumping is performed; (3) floating charging, in which the lithium battery with the Li4Ti5O12 negative electrode is alternatively and circularly charged with the constant current by using a small current and a micro current to the cutoff voltage, the alternative cycle frequency is 50-200 times, the small current is a current of 0.05-0.5C, and the micro current is a current of 0.005-0.05C; and (4) secondary activation, in which the lithium battery with the Li4Ti5O12 negative electrode is activated in a high-temperature of 50-80 DEG C for 24-72 hours and is allowed to be stood, and vacuum pumping is performed. The method is simple and is low in cost, the problem of Li4Ti5O12 bubbling is solved on a condition that no over-charging and easiness in operation are ensured, the cycle performance of the battery is improved, and the method has an important significance to promote application and development of the lithium battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for formation and floating charging of a lithium titanate negative electrode lithium battery. Background technique [0002] Lithium-ion batteries have gradually become a rookie in the energy field due to their significant advantages such as small size, light weight, high energy density, environmental protection, and no memory effect. Lithium titanate (Li 4 Ti 5 o 12 ) as a lithium-ion battery anode material, compared with the traditional graphite-based carbon anode, has many advantages: excellent cycle performance, almost no change in unit cell size before and after lithium titanate charging, it is a zero-strain material; fast charging , Lithium titanate belongs to the spinel structure, has a three-dimensional lithium ion channel, and the diffusion speed of lithium ions is fast; high safety, the lithium intercalation potential of lithium titanate is about 1....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44
CPCH01M10/44H01M10/443Y02E60/10
Inventor 龚本利朱勇张健范未峰
Owner SICHUAN JIANXING LITHIUM BATTERY
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