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Lithium ion battery and preparation method thereof

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as poor electrode compatibility, and achieve the effects of being suitable for large-scale production applications, easy to operate, and improving safety.

Active Publication Date: 2016-06-08
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfone compounds are not compatible with carbon material electrodes as electrolyte solvents, that is, sulfone electrolytes cannot form a stable solid electrolyte interface film (SEI) film on the surface of carbon material electrodes.

Method used

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  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof

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preparation example Construction

[0057] Another object of the present application is to provide a method for preparing a lithium-ion battery provided by the present application, which includes injecting the aforementioned electrolyte solution, wherein injecting the electrolyte solution includes the following two steps.

[0058] Step (1), pre-film forming process: after putting the battery cell into the packaging case, inject the pre-injection liquid, and after standing still, perform chemical conversion, and the pre-injection liquid forms a film on the surface of the negative electrode active material layer.

[0059] In the above step (1), the standing time is selected according to actual needs, preferably, standing for 1 to 15 hours.

[0060] In the above step (1), the time and current of the formation can be adjusted according to the different film-forming additives used. Preferably, the formation is carried out for 100 minutes with a current of 0.05C, and then the formation is carried out with a current of ...

Embodiment 1～16

[0086] In embodiment 1~16, all prepare according to following method:

[0087] (1) Pre-film formation process: take a single-layer laminated battery comprising lithium cobaltate and graphite, and design the capacity of the battery to be 2000mAh. In a dry environment, inject the pre-injection liquid, and after standing for 11 hours, carry out the formation. The pre-injection liquid forms a film on the surface of the negative electrode, and the formation conditions are as follows: charge at a constant current for 100 minutes at a current of 0.05C, leave it for more than 10 minutes, keep the liquid injection port open, charge at a constant current for 15 minutes at a current of 0.2C, and keep the injection The liquid port is left open for 48 hours; wherein, the pre-injection liquid is a mixture obtained by mixing lithium salt, organic solvent and film-forming additive, and the liquid retention coefficient of the pre-injection liquid is 0.002g / mAh;

[0088] (2) Secondary liquid in...

Embodiment 17～23

[0095] In embodiment 17~23, all prepare according to following method:

[0096] (1) Pre-film formation process: Take a single-layer laminated battery containing lithium cobalt oxide and graphite, with a design capacity of 2000mAh, inject the pre-injection liquid in a dry environment, and let it stand for 13 hours before forming. The pre-injection The liquid forms a film on the surface of the negative electrode, and the formation conditions are as follows: charge with a constant current of 0.05C for 100 minutes, leave it for more than 10 minutes, keep the liquid injection port open, and charge with a constant current of 0.2C for 15 minutes, keep the liquid injection port open In an open state, leave it for 48 hours; wherein, the pre-injection solution contains a mixed organic solvent with a weight ratio of EC:PC:EMC=1:1:1, LiPF with a concentration of 0.5mol / l in the electrolyte 6 and 0.5mol / l of LiFSI and 20% FEC of the total weight of the pre-injection solution, the liquid re...

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Abstract

The invention relates to a lithium ion battery and a preparation method of the lithium ion battery. The lithium ion battery comprises a negative plate and electrolyte, wherein the negative plate comprises a negative active substance layer containing a negative active material; the negative active material is a carbon material; the surface of the negative active substance layer is provided with an SEI (Solid Electrolyte Interface) membrane; the electrolyte is prepared from a solvent; the solvent is a sulphone compound; the sulphone compound is prepared from chain sulphone and annular sulphone. When the lithium ion battery is prepared, the preparation method comprises the following steps of selecting a pre-filming technology: injecting pre-injection liquid after putting a battery cell in a packaging shell, and forming after standing; selecting a secondary liquid injection technology: injecting the electrolyte which uses the sulphone compound as a solvent after the forming in step (1), standing under a vacuum condition, and then carrying out subsequent treatment. According to the lithium ion battery and the preparation method of the lithium ion battery, disclosed by the invention, the electrolyte which uses the sulphone compound as the solvent can be applied to a negative electrode of a carbon-containing material, and the lithium ion battery provided by the invention contains the electrolyte using the sulphone compound as the solvent and has good security under high voltage.

Description

technical field [0001] The present application relates to the field of lithium ion batteries, in particular, to a lithium ion battery and a preparation method thereof. Background technique [0002] The application of lithium-ion batteries in the field of consumer electronics has achieved great success. However, in the face of increasing energy and environmental threats, the development of power batteries that can be used in new energy vehicles has become a worldwide consensus. For power batteries, in order to solve the problem of battery life, it is necessary to further increase the energy density of the battery cells; in addition, the safety and stability of the electrolyte in the power cells has also become a major challenge. [0003] In order to solve the problem of energy density, it is hoped to develop lithium-ion batteries above 4.40V. However, most of the currently used electrolyte solvent systems contain organic carbonates such as ethylene carbonate (EC), propylene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0569H01M10/058H01M2300/0028Y02E60/10Y02P70/50
Inventor 湛英杰颜剑谢岚付成华
Owner DONGGUAN AMPEREX TECH
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