Battery liquid injection method and lithium ion battery prepared by method

A liquid injection and battery technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., can solve the problems of poor high and low voltage performance of lithium-ion batteries, failure to take into account the matching of positive and negative electrode materials and electrolytes, etc. Achieve the effect of improving electrochemical performance and good electrochemical performance

Active Publication Date: 2019-05-07
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method does not take into account the compatibility between the positive and negative electrode materials and the electrolyte, and the obtained lithium-ion battery has poor high and low voltage performance

Method used

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  • Battery liquid injection method and lithium ion battery prepared by method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A kind of preparation method of lithium ion battery comprises the steps:

[0048] (1) LiNi 0.9 co 0.05 mn 0.05 o 2 Prepare the positive electrode sheet as the positive electrode material, graphite as the negative electrode material to prepare the negative electrode sheet, the diaphragm is Celgard2400, make the positive electrode sheet, the negative electrode sheet and the diaphragm into an electrode group, and put the battery pack into the battery case;

[0049] (2) In the battery shell containing the electrode group, a negative electrode film-forming electrolyte is used for one-time injection. The negative electrode film-forming electrolyte is lithium hexafluorophosphate with a molar concentration of 1.5mol / L, and the amount of liquid injection is the electrolyte in the battery. 60% of the total mass, the battery obtained after liquid injection is subjected to a pumping and sealing and standing at 80°C for 15 hours;

[0050] (3) Charge the battery obtained after th...

Embodiment 2

[0054] The difference from Embodiment 1 is that the first charge cut-off voltage in step (3) is 1.5V.

Embodiment 3

[0056] The difference from Embodiment 1 is that the first charge cut-off voltage in step (3) is 2.7V.

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Abstract

The invention relates to a battery liquid injection method and a lithium ion battery prepared by the method. The method comprises that a cathode film forming electrolyte is used in a battery casing including an electrode group to carry out primary liquid injection, and primary formation is then carried out to form an SEI film in the cathode; and an anode film forming electrolyte is used to carry out secondary liquid injection, and secondary formation is carried out to form an SEI film in the anode. Different electrolytes are used in twice liquid injection, and compared with a once liquid injection manner in the prior art, the two different electrolytes are used to consider both requirements for the electrolyte of anode and cathode SEI film formation, and two different formation processes are arranged according to cathode and anode SEI film formation conditions, further sound SEI films can be formed in the surfaces of the cathode and anode, and the battery obtained by liquid injection has a high electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a battery liquid injection method and the prepared lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, no memory effect, low self-discharge rate, long cycle life and high energy density. They are widely used in portable electronic devices, new energy vehicles, energy storage and starting power lamps. Lithium-ion batteries are mainly composed of positive pole pieces, negative pole pieces, electrolyte and shell. The electrolyte is usually composed of lithium salt and organic solvent. As an important part of lithium-ion batteries, electrolyte is an important part of lithium-ion batteries. All aspects of performance have a direct impact. [0003] Liquid injection is a very important process in the production of lithium-ion batteries, which directly affects the electrochemical performance of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/36H01M10/0567H01M10/058H01M10/0525H01M50/60
CPCY02P70/50
Inventor 黄苗侯桃丽杨威威陈校军徐锋曾冬冬赵红维刘金成
Owner EVE ENERGY CO LTD
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