A lithium battery composite diaphragm with a three-dimensional network structure and its preparation method
A technology of composite diaphragm and network structure, which is applied in the direction of structural parts, electrolyte battery manufacturing, circuits, etc., can solve the problems of weak bonding force of ceramic coating base film, easy to block the texture of base film pores, etc., and achieve good application prospects and process cycle Effect of short, narrow pore size distribution
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[0030] The preparation method of the lithium battery composite diaphragm with a three-dimensional network structure of the present invention comprises the following steps:
[0031] (1) Purification treatment of the bacterial cellulose wet film, the bacterial cellulose wet film is treated in a sodium hydroxide solution for a certain period of time, and then repeatedly washed with deionized water until neutral, and the wet film state is kept for standby;
[0032] (2) Bacterial cellulose wet film is compounded with functional particles. According to the different formation methods of functional particles, this operation is divided into two methods:
[0033] 1) The above-mentioned purified bacterial cellulose wet film is added to pre-dispersed functional particles in a solvent, and the functional particles are diffused into the internal network structure of the cellulose film by ultrasonic assistance to obtain a composite diaphragm wet film;
[0034] 2) Add precursors that can gen...
Embodiment 1
[0038]The bacteria cellulose wet film with a size of 10cm×10cm and a thickness of 2.0mm (fiber diameter about 60nm) was immersed in a sodium hydroxide solution with a mass concentration of 10% for 30min (40°C), and then repeated with excess deionized water. Wash until neutral; mix the above-mentioned bacterial cellulose wet film with zirconia particles with a particle size of 50nm (the mass ratio of cellulose dry film to particle is 1:0.5) in 500ml acetone, and ultrasonically treat it for 120min; finally composite the diaphragm The wet film was dried at 40°C for 12 hours, and a lithium battery composite separator with a three-dimensional network structure was obtained after rolling treatment.
[0039] The above-mentioned composite separator was prepared into a lithium-ion button battery according to the prior art for testing.
[0040] Membrane structure test results: thickness 28μm, average pore diameter 90nm, porosity 51%.
[0041] Film strength test results: transverse tens...
Embodiment 2
[0045] Immerse the bacterial cellulose wet film (fiber diameter about 100nm) with a size of 10cm×10cm and a thickness of 5.0mm in a sodium hydroxide solution with a mass concentration of 20% for 30min (80°C), and then repeatedly use excess deionized water. Wash until neutral; mix the above-mentioned bacterial cellulose wet film with alumina particles with a particle size of 200nm (the mass ratio of cellulose dry film to particle is 1:2) in 500ml dimethylformamide, and sonicate for 180min ; Finally, the composite diaphragm wet film was dried at 60° C. for 12 hours, and a lithium battery composite diaphragm with a three-dimensional network structure was obtained after rolling treatment.
[0046] The above-mentioned composite separator was prepared into a lithium-ion button battery according to the prior art for testing.
[0047] Membrane structure test results: thickness 32μm, average pore diameter 130nm, porosity 56%.
[0048] Film strength test results: transverse tensile str...
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