Method for solving high-temperature flatulence of lithium titanate negative lithium-ion battery

A lithium ion battery, lithium titanate technology, applied in electrical components, battery pack components, circuits, etc., can solve problems such as battery short circuit, achieve the effect of solving the problem of flatulence, excellent rate charging and discharging performance, and avoiding battery short circuit

Inactive Publication Date: 2016-03-30
WANXIANG 123 CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the common problem of flatulence in lithium ion batteries with lithium titanate as negative electrode material in the prior art, and provides a method for solving high temperature flatulence of lithium titanate negative electrode lithium ion batteries, with simple process steps and operability Strong, can completely solve the problem of flatulence of lithium titanate batteries during high-temperature cycles, and ensure the excellent rate charge and discharge performance of lithium titanate batteries while improving high-temperature cycle performance
In the present invention, the high-temperature aging of the battery after the formation is carried out first, and then the capacity is divided. The high-temperature aging temperature is controlled at 90-120°C (high temperature). Ti on the surface of lithium oxide particles 3+ It is isolated from the organic solvent of the electrolyte, so as to completely solve the problem of flatulence of lithium titanate batteries during high-temperature cycles. At the same time, the present invention coats a layer of ceramic coating on one side of the separator. Conventional ceramic-coated polyethylene separators are prone to Shrinkage occurs, which leads to direct contact between the positive and negative electrodes in the battery, resulting in a short circuit of the battery. The ceramic coating can ensure that the diaphragm does not shrink during the high temperature aging stage, avoiding the short circuit of the battery. In addition, the lithium titanate coating on the diaphragm and the lithium titanate negative Very same material, can maintain good electrochemical interfacial compatibility, compared to other types of ceramic coatings, such as silicon dioxide (SiO 2 ) or aluminum oxide (Al 2 o 3 ), lithium titanate (Li 4 Ti 5 o 12 ) etc. have a higher lithium ion conductivity, while improving the high temperature cycle performance, it can also ensure the excellent rate charge and discharge performance of lithium titanate batteries

Method used

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  • Method for solving high-temperature flatulence of lithium titanate negative lithium-ion battery

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Embodiment 1

[0021] (1) Making positive and negative electrodes: the positive electrode material (polyvinylidene fluoride 7%, superconducting carbon black 5%, LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The remainder) is dispersed in an organic solvent (N-methylpyrrolidone), stirred evenly and coated on the positive electrode current collector, dried at 80°C and rolled to obtain a thickness of 200 μm and a compacted density of 3 g / cm 3 positive electrode sheet; disperse the negative electrode materials (2% sodium carboxymethyl cellulose, 8% styrene-butadiene rubber, 4% superconducting carbon black, and the rest of lithium titanate) in water, stir evenly and coat on the negative electrode current collector , after drying at 100°C, the thickness is 120μm, and the compaction is 2g / cm 3 When coating, the capacity per unit area of ​​the positive electrode: the capacity per unit area of ​​the negative electrode = 1.2:1; put the above-mentioned electrode sheet in a vacuum oven and bake at 125°C for 23 hours, t...

Embodiment 2

[0030] (1) Making positive and negative electrodes: the positive electrode material (polyvinylidene fluoride 7%, superconducting carbon black 5%, LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The remainder) is dispersed in an organic solvent (N-methylpyrrolidone), stirred evenly and coated on the positive electrode current collector, dried at 50°C and rolled to obtain a thickness of 100 μm and a compacted density of 2.8 g / cm 3 positive electrode sheet; disperse the negative electrode materials (2% sodium carboxymethyl cellulose, 8% styrene-butadiene rubber, 4% superconducting carbon black, and the rest of lithium titanate) in water, stir evenly and coat on the negative electrode current collector , after drying at 90°C, the thickness is 60μm and the compaction is 1.8g / cm 3 When coating, the capacity per unit area of ​​the positive electrode: the capacity per unit area of ​​the negative electrode = 1.05:1; put the above-mentioned electrode sheet in a vacuum oven and bake at 120°C for 22 hours,...

Embodiment 3

[0036] (1) Making positive and negative electrodes: the positive electrode material (polyvinylidene fluoride 7%, superconducting carbon black 5%, LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The remainder) is dispersed in an organic solvent (N-methylpyrrolidone), stirred evenly and coated on the positive current collector, dried at 100°C and rolled to obtain a thickness of 350 μm and a compacted density of 3.4 g / cm 3 positive electrode sheet; disperse the negative electrode materials (2% sodium carboxymethyl cellulose, 8% styrene-butadiene rubber, 4% superconducting carbon black, and the rest of lithium titanate) in water, stir evenly and coat on the negative electrode current collector , after drying at 120°C, the thickness is 200μm, and the compaction is 2.4g / cm 3 When coating, the capacity per unit area of ​​the positive electrode: the capacity per unit area of ​​the negative electrode = 1.5:1; put the above-mentioned electrode sheet in a vacuum oven and bake at 130°C for 24 hours, then c...

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Abstract

The invention discloses a method for solving high-temperature flatulence of a lithium titanate negative lithium-ion battery. The method comprises the following steps: fabricating a positive plate and a negative plate; fabricating a battery core; carrying out welding and packaging; carrying out encapsulating and liquid filling; carrying out formation and grading; controlling and designing the capacity of the positive plate when fabricating the positive plate and the negative plate; and designing the capacity of the negative plate; the adopted diaphragm when the battery core is fabricated is a ceramic-coated polyethylene diaphragm; the thickness of the ceramic-coated polyethylene diaphragm is 16-25 microns; high-temperature ageing and re-grading are carried out on the battery after formation in the forming and grading processes; and the high-temperature ageing temperature is 90-120 DEG C. The method disclosed by the invention is simple in process step and high in operability; the problem of flatulence of a lithium titanate battery in a high-temperature cycle can be thoroughly solved; and high-rate charge-discharge capability of the lithium titanate battery is ensured when the high-temperature cycle performance is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion batteries, in particular to a method for solving high-temperature flatulence of lithium titanate negative electrode lithium ion batteries. Background technique [0002] At present, most of the negative electrode materials of lithium-ion batteries that have been commercialized are graphite materials. Due to the low coulombic efficiency and low lithium intercalation potential of graphite materials, it is easy to cause lithium crystal dendrites to precipitate on the surface of the negative electrode during the discharge process, thereby stimulating A broken diaphragm causes a short circuit in the battery, resulting in a safety accident. [0003] Lithium titanate with a spinel structure is a new type of negative electrode material with excellent performance. First of all, it has a high lithium extraction potential (1.55Vvs.Li + / Li) and higher Li-ion diffusion coefficient (2×10 -8...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/12H01M2/16H01M50/434H01M50/446H01M50/451H01M50/497
CPCY02E60/10
Inventor 石先兴王慧敏严红吕豪杰
Owner WANXIANG 123 CO LTD
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