Palygorskite/aluminum oxide composite lithium ion battery coating diaphragm and preparation method thereof

Abstract

The invention discloses a palygorskite / aluminum oxide composite lithium ion battery coating diaphragm and a preparation method thereof. The surface of a lithium ion battery diaphragm substrate of the palygorskite / barium sulfate composite lithium ion battery coating diaphragm disclosed by the invention is uniformly coated by a layer of palygorskite / barium sulfate slurry; the palygorskite / barium sulfate slurry is prepared from the following raw materials by weight percent: 0.7-1.5% of a surfactant, 0.5-1.0% of a thickening agent, 6.0-12.0% of an adhesive, 0.1-0.5% of a dispersing agent, 20.0-50.0% of a palygorskite / barium sulfate mixture, 3.0-7.0% of a defomaing agent and 40.0-70.0% of a solution, wherein the sum of the percentages of the raw materials is 100.0%. The invention further discloses a preparation method. By adopting the palygorskite / barium sulfate composite lithium ion battery coating diaphragm disclosed by the invention, the electrochemical property of a lithium ion battery can be effectively improved by the related product, the cost is low, and great competitive advantages in market can be achieved.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to a palygorskite / alumina composite lithium-ion battery coating diaphragm and a preparation method thereof. Background technique [0002] According to the National Bureau of Statistics, from 2005 to 2014, the average annual growth rate of automobiles reached 15.61%. However, the increase in the number of automobiles has brought about problems such as the reduction of petroleum energy, environmental pollution, and urban space congestion, so new energy vehicles have developed rapidly. In 2014, a total of 353,522 electric vehicles were sold in the global market, a year-on-year increase of 53.5%. According to statistics from the Ministry of Industry and Information Technology, from January to June 2015, my country's new energy vehicles produced a total of 78,500 units, a year-on-year increase of 3.0 times. The new energy vehicle market has huge prospects. As an important chemical po...

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Problems solved by technology

[0004] Chinese patent 201210091286.X discloses a method for preparing a β-alumina ceramic diaphragm, Chinese patent 201510291767.9 discloses a method for preparing a ceramic diaphragm modified with nano-alumina particles, and Chinese patent 201310572688.6 discloses a ceramic diaphragm and its The preparation method and application are all made of alumina, binder and related auxiliary materials. After the slurry is prepared, it is evenly coated on the surface of the traditional polyethylene or polypropylene diaphragm. Due to the high price of high-purity alumina, the price of the corresponding coated diaphragm is relatively high. High, which is not conducive to reducing the production cost of lithium-ion batteries, and has no obvious market competitive advantage; the density of alumina is relatively high, on the one hand, the prepared suspended ceramic slurry is easy to precipitate, resulting in uneven concentration of ceramic slurry, and the thickness of diaphragm coating The accuracy is difficult to control; on the other hand, it is relatively difficult to improve the mass specific energy of lithium-ion batteries for this type of coating separator; the alumina crystal structure is dense and the specific surface area is small, and the lithium-ion batteries prepared by corresponding coating separators are in the capacity, Formation, aging and other stages will produce partial swelling, resulting in low pass rate of lithium-ion batteries

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