High-safety semi-solid lithium ion battery and manufacturing method thereof

A technology of lithium-ion batteries and manufacturing methods, which is applied in the direction of electrolyte storage battery manufacturing, secondary batteries, battery pack components, etc., can solve the problems of battery life and power performance impact, uneven electrode interface, increase battery internal resistance, etc., to achieve Improve the effect of large interface resistance, reduce the amount of electrolyte, and reduce the interface resistance

Pending Publication Date: 2022-04-05
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional semi-solid battery is coated with a solid electrolyte on the separator or added to the electrode. Although the lithium ion conduction of the all-solid battery has been improved, the electrode interface is still not uniform enough. A high energy barrier leads to an increase in diffusion resistance, and the interface resistance will also increase the internal resistance of the battery, which will affect the life and power performance of the battery to a certain extent.

Method used

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  • High-safety semi-solid lithium ion battery and manufacturing method thereof
  • High-safety semi-solid lithium ion battery and manufacturing method thereof
  • High-safety semi-solid lithium ion battery and manufacturing method thereof

Examples

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Embodiment approach

[0037] According to a specific embodiment of the present invention, the coating is gravure coating.

[0038] According to the present invention, the thickness of the mixed coating can be determined as required, preferably, the thickness of the mixed coating on one side is 2-7 μm.

[0039] Optionally, the pressure formed by the high temperature pressure is 0.05-1 MPa, and the temperature is 45-85°C.

[0040] The present invention will be described in more detail below by way of examples and comparative examples.

Embodiment 1

[0051] (1) Prepare a functionalized diaphragm according to step (1) of Comparative Example 2;

[0052] (2) The diaphragm and the ternary positive electrode sheet and the graphite negative electrode sheet are laminated by a lamination machine, and are packaged with an aluminum-plastic film after being connected to the lug;

[0053] (3) Inject liquid into the packaged cell, the liquid injection coefficient is 2.0g / Ah, and let the liquid injection stand for 24 hours;

[0054] (4) Then pre-charge and form the batteries, and after the formation, heat-press the batteries. The SOC of the batteries is 50%, the hot-pressing temperature is 85°C, the hot-pressing pressure is 0.6MPa, and the hot-pressing time is 20 After hot pressing, quickly put it into the normal temperature fixture and carry out cold pressing for 10 minutes;

[0055] (5) The composite battery cell is subjected to 24h aging treatment, degassing, and capacity separation to obtain a high-safety semi-solid battery.

Embodiment 2

[0057] (1) will be to the Li of step (1) in embodiment 1 2 S-P 2 S 5 Replace with Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 , and other parameter conditions remain unchanged, the functionalized separator is prepared;

[0058] (2) According to the steps (2)-(5) of Example 1, an integrated cell with a diaphragm and a pole piece was prepared.

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Abstract

The invention relates to a high-safety semi-solid lithium ion battery and a manufacturing method thereof, the battery comprises a positive pole piece, a negative pole piece, a diaphragm and a gel solid electrolyte layer, and the gel solid electrolyte layer is located between the pole pieces and the diaphragm; and the gel solid electrolyte layer is a mixed coating formed by uniformly dispersing solid electrolyte in gel electrolyte. According to the invention, a composite layer of the gel electrolyte and the solid electrolyte is constructed between the diaphragm and the electrode through electrolyte swelling, a thermal compounding process and an in-situ curing technology, and the solid electrolyte is uniformly dispersed in the gel electrolyte, so that the migration efficiency of lithium ions in the gel electrolyte layer is effectively improved. And the diaphragm can be effectively bonded with the electrode through the polymer glue layer, so that the uniformity of an interface is ensured, short circuit caused by dislocation of a pole piece in a use process is avoided, the hardness of the battery is improved, free liquid electrolyte of a battery cell is reduced, and the safety performance of the battery is further improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a high-safety semi-solid lithium ion battery and a manufacturing method thereof. Background technique [0002] Compared with liquid lithium-ion batteries, semi-solid lithium-ion batteries, because a part of the electrolyte is replaced by solid electrolyte, the risk of organic electrolyte decomposition and combustion at high temperature is greatly reduced, and the safety performance of the battery is significantly improved; compared with solid-state lithium-ion batteries, it needs to overcome There are fewer technical difficulties, and it is easier to realize industrialization. Based on the above advantages, semi-solid lithium-ion batteries have been favored by many battery manufacturers. [0003] At present, the traditional semi-solid battery is coated with a solid electrolyte on the separator or added to the electrode. Although the lithium ion conduction of the all-solid batt...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M50/403H01M50/489H01M50/46H01M10/056H01M10/0525
CPCY02P70/50
Inventor 孙小嫚李丹杨道均刘正耀吴宁宁
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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