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Lithium battery diaphragm, preparation method thereof, and lithium battery using the same

A lithium battery diaphragm, lithium battery technology, applied in secondary batteries, battery components, nanotechnology for materials and surface science, etc., can solve the problems that hinder the widespread application of lithium metal negative electrodes, electrolyte solution and active lithium loss, Reduced Coulombic efficiency and other issues, to achieve the effect of facilitating uniform nucleation, strong capacity retention, and eliminating short circuits

Active Publication Date: 2020-04-28
咸阳瞪羚谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the dendritic growth of Li is the reason that hinders the widespread application of Li metal anodes.
This dendritic growth of Li metal may lead to two important problems: (1) generation of brittle and heterogeneous solid electrolyte interphase (SEI); (2) loss of electrolyte solution and active Li leading to decreased Coulombic efficiency
However, all these strategies mentioned above are based on the inhibition of dendrite growth by artificial SEI and confinement effects of 3D hosts, seldom considered from the aspects of nucleation and grain growth, while the growth of lithium dendrites is in terms of thermodynamics and kinetics. All are spontaneous; in addition, the non-uniform electric field in the liquid electrolyte solution system is also an important reason for the uneven nucleation of lithium

Method used

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  • Lithium battery diaphragm, preparation method thereof, and lithium battery using the same
  • Lithium battery diaphragm, preparation method thereof, and lithium battery using the same
  • Lithium battery diaphragm, preparation method thereof, and lithium battery using the same

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preparation example Construction

[0038] The specific preparation method of the above diaphragm and lithium battery comprises the following steps:

[0039] Step 1, uniformly deposit elements with good wettability with lithium on the separator of lithium battery by DC magnetron sputtering process;

[0040] Install the pre-purchased battery diaphragm as the diaphragm substrate in the sputtering chamber and cover it with a baffle, select the corresponding target according to the deposition elements, clean the target with acetone and dry it, and pre-sputter for 5 minutes to remove surface oxides and impurities , to ensure that there is no impurity deposited on the surface of the subsequent separator substrate, and the purity of the target is ≥99.99%; start sputtering to deposit elements with good wettability with lithium on the battery separator substrate, and the process parameters of DC magnetron sputtering are: background Vacuum degree (0.1~9.9)×10 -5Pa, the working pressure is 0.25-0.35Pa, the target distance...

Embodiment 1

[0057] Preparation of Mg-modified separator and its application on Li-LiCoO 2 full battery;

[0058] Install the pre-purchased battery separator in the sputtering chamber and cover it with a baffle. The Mg target with a purity of 99.99% is cleaned and dried with acetone, and then pre-sputtered for 5 minutes to remove surface oxides and impurities to ensure the smoothness of subsequent separator surface deposition. It is pure Mg, and the process parameters of DC magnetron sputtering are: the background vacuum degree is 5.0×10 -4 Argon gas with a purity of 99.99% was introduced at Pa, the working pressure was 0.30 Pa, the target distance was 10 cm, the sputtering power was 70 W, the sputtering temperature was 25° C., and the sputtering was 1 min.

[0059] LiCoO with a weight ratio of 8:1:1 2 , Super-P and PVDF were dispersed in NMP, and the mixture was ball-milled for 1.5 h to achieve thorough mixing to form LiCoO 2 slurry, the LiCoO 2 The slurry was dropped on the Al foil, ...

Embodiment 2

[0063] Fabrication of Ti-modified separators and their application on Li-LiCoO 2 full battery.

[0064] Install the pre-purchased battery diaphragm in the sputtering chamber and cover it with a baffle. The Ti target with a purity of 99.99% is cleaned and dried with acetone, and then pre-sputtered for 5 minutes to remove surface oxides and impurities to ensure the smoothness of subsequent deposition on the diaphragm surface. It is pure Ti, and the process parameters of DC magnetron sputtering are: the background vacuum degree is 5.0×10 -4 Argon gas with a purity of 99.99% was introduced at Pa, the working pressure was 0.30 Pa, the target distance was 10 cm, the sputtering power was 80 W, the sputtering temperature was 25° C., and the sputtering was 3 min.

[0065] LiCoO with a weight ratio of 8:1:1 2 , Super-P and PVDF were dispersed in NMP, and the mixture was ball milled for 2h to achieve thorough mixing to form LiCoO 2 slurry, the LiCoO 2 The slurry was dropped on the Al...

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Abstract

The invention discloses a lithium battery diaphragm, a preparation method thereof, and a lithium battery using the diaphragm. The battery separator uses nanoparticles capable of solid solution with lithium as its heterogeneous nucleation sites for its good wettability with lithium. Lithium metal first nucleates uniformly on the modified separator, and then on the separator-negative electrode grow in the direction. The preparation method is not to suppress lithium dendrites, but to reverse the growth direction of lithium from the negative electrode to the separator to the separator to the negative electrode, which prevents the possibility of lithium dendrites penetrating the separator and connecting the positive electrode to cause a short circuit, and greatly improves the lithium battery. Safety performance, with stronger capacity retention.

Description

【Technical field】 [0001] The invention belongs to the field of energy batteries, and in particular relates to a lithium battery diaphragm, a preparation method thereof, and a lithium battery using the diaphragm. 【Background technique】 [0002] With the rapid development of the economy and the continuous improvement of people's living standards, human demand for energy continues to increase. However, conventional graphite anodes used in commercial Li-ion batteries have a low theoretical capacity (372 mAh g -1 ), so there is an urgent need for anode materials with high energy density to meet the development of emerging high-end energy devices. Because lithium metal has 3860mAh·g -1 The extremely high theoretical capacity, which is more than 11 times higher than that of traditional graphite anodes, is considered to be the "holy grail" material of the anode. [0003] However, dendritic growth of Li is the reason that hinders the widespread application of Li metal anodes. Thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525B82Y30/00C23C14/35H01M50/403H01M50/443
CPCH01M10/0525C23C14/35B82Y30/00H01M50/431H01M50/403Y02E60/10
Inventor 宋江选刘洋洋熊仕昭王佳林宋忠孝
Owner 咸阳瞪羚谷新材料科技有限公司
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