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Low-temperature lithium ion battery

A lithium-ion battery, low-temperature technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low-temperature performance of lithium-ion batteries that need to be further improved, low energy density, and no obvious improvement in the first-time efficiency of lithium-ion batteries. Improved low-temperature charging performance, high dielectric constant, and the effect of increasing low-temperature charging performance

Inactive Publication Date: 2020-01-31
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the first efficiency of the low-temperature lithium-ion battery has not been significantly improved, and the energy density is low, and the low-temperature performance of the lithium-ion battery needs to be further improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The low-temperature lithium-ion battery of this embodiment includes a positive electrode sheet, a negative electrode sheet, a diaphragm, and an electrolyte;

[0029] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer arranged on the surface of the positive electrode current collector. The surface density of the positive electrode active material layer is 148g / m 2 , the compacted density of the positive electrode active material layer is 4.0g / m 3 , the positive electrode active material layer includes a 4.4V lithium cobaltate material with a mass ratio of 97.5:1.5:1, a positive electrode conductor and a positive electrode binder; the 4.4V lithium cobaltate material is mixed by at least two spherical particles with different particle sizes, The 4.4V lithium cobaltate material has a median particle size of 15 μm and a specific surface area of ​​0.27m 2 / g, the tap density is 2.7g / cm 3 , wherein, the...

Embodiment 2

[0040] The difference with embodiment 1 is:

[0041] The surface density of the positive electrode active material layer is 145g / m 2 , the compacted density of the positive electrode active material layer is 3.6g / m 3 . The surface density of the negative electrode active material layer is 75g / m 2 , the compacted density of the negative electrode active material layer is 1.3g / m 3 .

[0042] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0044] The difference with embodiment 1 is:

[0045] The surface density of the positive electrode active material layer is 150g / m 2 , the compacted density of the positive electrode active material layer is 4.2g / m 3 . The surface density of the negative electrode active material layer is 80g / m 2 , the compacted density of the negative electrode active material layer is 1.8g / m 3 .

[0046] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the field of lithium batteries, in particular to a low-temperature lithium ion battery. The positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer comprises 4.4 V lithium cobaltate material, a positive electrode conductive agent and a positive electrode binder. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer comprises a hard carbon coatedsecondary particle artificial graphite material, a negative electrode conductive agent, a dispersant and a negative electrode binder. The electrolyte comprises 10-20% of lithium hexafluorophosphate,10-20% of ethyl propionate, 10-20% of diethyl carbonate, 15-30% of vinyl carbonate, 15-30% of propyl propionate, 3-10% of fluorovinyl carbonate, 2-3% of propylene sulfite, 0.5-2.5% of ethylene glycolmonobutyl ether and 0.5-2.5% of 2, 2'-dithiopyridine. Compared with the batteries in the prior art, the lithium ion battery has good charging and discharging performance and higher energy density under low temperature condition.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a low-temperature lithium ion battery. Background technique [0002] In recent years, as the development of lithium-ion batteries has become increasingly mature, its use has become more and more extensive, and the use environment of batteries is relatively complex and changeable, so the performance requirements for lithium-ion batteries are also higher. At present, the low-temperature performance of lithium-ion batteries is relatively poor, especially in low-temperature environments below -20°C, the charging of lithium-ion batteries becomes extremely difficult, lithium dendrites will precipitate, the battery may be short-circuited, and the battery will discharge The performance will also be greatly attenuated, and the subsequent electrochemical performance will be greatly reduced. Therefore, the research on the use of lithium-ion batteries in cold environments has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/36H01M4/587H01M10/0569
CPCH01M10/0525H01M4/366H01M4/587H01M10/0569H01M2300/0042Y02E60/10
Inventor 李红朱坤庆计阳夏小勇庞佩佩刘露聂灿
Owner 东莞维科电池有限公司
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