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Ceramic slurry, ceramic separator and lithium-ion battery

A technology of ceramic slurry and ceramic diaphragm, which is applied in secondary batteries, battery pack components, circuits, etc., can solve the problems that need to be improved, the trend of thin diaphragm is contradictory, and the resistance to lithium dendrite puncture has not been greatly improved. , to achieve excellent electron barrier properties, good resistance to lithium dendrite puncture, and the effect of inhibiting self-discharge

Active Publication Date: 2022-05-17
乐凯胶片股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of a thicker ceramic coating will inevitably lead to an increase in the overall thickness and surface density of the separator, which is contrary to the trend of thinning the separator; The anti-lithium dendrite puncture ability of the lithium battery separator has not been greatly improved
[0004] Thereby, the relevant technology of existing lithium-ion battery still needs to be improved

Method used

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  • Ceramic slurry, ceramic separator and lithium-ion battery
  • Ceramic slurry, ceramic separator and lithium-ion battery
  • Ceramic slurry, ceramic separator and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 15g of montmorillonite, 25g of nano-ceramic particles, 5g of polymethyl methacrylate and 2.5g of fatty alcohol polyoxyethylene ether were evenly dispersed into 52.5g of water under stirring, and a ceramic slurry was prepared by sand milling, wherein the montmorillonite The diameter-thickness ratio of the soil is 200-350, and the specific surface area is 240m 2 / g, the average wafer thickness is less than 25nm. A polyethylene film with a thickness of 5 μm prepared by Lucky Film Co., Ltd. was used as the base film. After the ceramic slurry is prepared, the prepared ceramic slurry is evenly coated on one surface of the base film with a wire rod, and then dried in an oven at 70°C to evaporate the water to obtain a ceramic with a ceramic coating thickness of 3 μm. diaphragm.

Embodiment 2

[0056] Disperse 10g of montmorillonite, 30g of nano-ceramic particles, 8g of polymethyl methacrylate and 2g of fatty alcohol polyoxyethylene ether into 50g of water evenly under stirring, and prepare a ceramic slurry through sand milling, wherein the hydrotalcite powder The ratio of diameter to thickness is 350-400, and the specific surface area is 550m 2 / g, the average wafer thickness is less than 25nm. A polyethylene film with a thickness of 7 μm prepared by Lucky Film Co., Ltd. was used as the base film. After preparing the ceramic slurry, the prepared ceramic slurry was evenly coated on one surface of the base film with a wire rod, and then dried in an oven at 70°C to evaporate the water to obtain a ceramic coating with a thickness of 2.5 μm. Ceramic diaphragm.

Embodiment 3

[0058] 5g of montmorillonite, 35g of nano-ceramic particles, 3g of polymethyl methacrylate and 0.5g of fatty alcohol polyoxyethylene ether were uniformly dispersed into 50g of water under stirring, and prepared into a ceramic slurry by sand milling, wherein the montmorillonite The diameter-thickness ratio is 150-200, and the specific surface area is 150m 2 / g, the average wafer thickness is less than 25nm. A polyethylene film with a thickness of 16 μm prepared by Lucky Film Co., Ltd. was used as the base film. After the ceramic slurry is prepared, the prepared ceramic slurry is evenly coated on one surface of the base film with a wire rod, and then dried in an oven at 70°C to evaporate the water to obtain a ceramic with a ceramic coating thickness of 2 μm. diaphragm.

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Abstract

The invention provides ceramic slurry, ceramic separator and lithium ion battery. The ceramic slurry includes: layered inorganic material; nano ceramic particles; binder; additive; water, wherein the diameter-to-thickness ratio of the layered inorganic material is 150-400. The ceramic slurry has strong stability and can meet actual production needs, and it can extend the growth path of lithium dendrites in lithium-ion batteries, thereby making the ceramic separator have good resistance to lithium dendrite puncture; at the same time, the ceramic slurry has The formed ceramic coating can make the ceramic diaphragm have a small degree of thermal shrinkage and good stability.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery diaphragms, and in particular, relates to ceramic slurry, ceramic diaphragms and lithium-ion batteries. Background technique [0002] At present, with the increasing problems of environmental pollution and energy shortage, lithium-ion batteries with advantages such as high energy density, long cycle life, high power density, and no memory effect are increasingly recognized internationally and widely used in digital electronic products. , new energy vehicles and many other fields. As one of the key inner components that isolate the positive and negative electrodes of the battery to prevent short circuits and conduct lithium ions, the performance of the separator determines the interface structure, internal resistance, etc. of the battery, and affects the capacity and cycle life of the battery. Especially the safety performance of the battery. However, separators made of traditional po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/18H01M50/403H01M50/446H01M10/0525C04B40/02C04B111/90C04B111/94H01M50/434H01M50/449H01M50/491
CPCC04B26/18H01M10/0525C04B2111/00844C04B2111/90C04B2111/94H01M50/403H01M50/431H01M50/411C04B14/104C04B18/023C04B24/32C04B40/0263C04B22/06Y02E60/10
Inventor 张文静王莉吴斌章峰勇王小记柳青
Owner 乐凯胶片股份有限公司