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A kind of electrolytic solution and lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of poor cycle performance of batteries, achieve the effects of improving service life, good charge and discharge cycle performance, and reducing gas production

Active Publication Date: 2016-03-09
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the charging cut-off voltage is properly higher than 4.2V, although the capacity of the lithium-ion battery can be effectively improved, the gassing reaction of the battery leads to poor cycle performance of the battery.

Method used

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  • A kind of electrolytic solution and lithium ion battery
  • A kind of electrolytic solution and lithium ion battery
  • A kind of electrolytic solution and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0030] 1. Characteristics of the battery system

[0031] Battery model: 624199P; positive electrode system: lithium cobaltate (coated, doped); negative electrode system: natural graphite. Physical and chemical properties of lithium cobaltate: D50 is 18.75μm; specific surface area is 0.2m 2 / g; the compacted density of pole piece is 3.7~3.8g / cm 3 ; 1C capacity of 150 ~ 170mA / g; natural graphite: D50 is 20.65μm; specific surface area is 1.64m 2 / g; the compacted density of pole piece is 1.5~1.6g / cm 3 ; 1C capacity play 330 ~ 360mA / g.

[0032] Electrolyte solution system: EC / EMC / DEC (volume ratio: 2:1:4), lithium ion concentration (Li+): 1.2mol / L; additive is benzotriazole compound 2% (percentage of total weight of electrolyte ), perfluoroethylene carbonate 2% (the percentage of the total weight of the electrolyte).

[0033] 2. Determination of battery capacity

[0034] The battery capacity is tested by the blue electricity detection cabinet, and the specific operations are...

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Abstract

The invention discloses an electrolyte and a lithium ion battery and belongs to the field of lithium ion batteries. The electrolyte solves the problem that the existing lithium ion battery has a low capacity and when charging voltage is higher than 4.2V, the existing lithium ion battery produces gas and expands so that cycling performances are poor and a service life is influenced. The electrolyte comprises lithium hexafluorophosphate, solvents and additives. The additives comprise a benzotriazole compound and perfluoroethylene carbonate The electrolyte can reduce a gas production amount in battery formation, prevent gas production and expansion of a battery, and improve a battery service life, a battery capacity and cycling performances. The lithium ion battery adopts the electrolyte so that charge cut-off voltage of the lithium ion battery is improved to 4.35V; a capacitance is improved by 15% and after 300 cycles, a capacitance is still 90% of the initial capacitance; the thickness of the lithium ion battery is changed by below 3%; and a service life is improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] Due to its high operating voltage, high energy density, and long cycle life, lithium-ion batteries have been widely used in various portable digital products after more than ten years of development. extremely broad. However, in recent years, as these devices have become more efficient, batteries have been required to have higher capacities. [0003] In order to obtain a higher capacity of lithium-ion batteries, technicians usually improve and modify the performance of positive electrode materials and negative electrode materials. The effective capacity of lithium-ion batteries is directly related to the cut-off voltage of lithium-ion batteries. The higher the cut-off voltage is within a certain range, the higher the effective capacity of the battery will be. Of course, the cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCY02E60/10
Inventor 张雨婷姚彩芳赵付双贾秋荣张小海邱沫
Owner ZHENGZHOU BAK BATTERY CO LTD
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