Thermal closed pore composite diaphragm as well as preparation method and application thereof
A composite diaphragm and closed-cell technology, which is applied in the field of lithium-ion batteries, can solve the problems that the safety of the diaphragm cannot be fundamentally improved, the safety of the diaphragm cannot be fundamentally improved, and the heat resistance of the diaphragm is poor, achieving excellent thermal stability, Effect of improving dimensional stability and improving wettability
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Embodiment 1
[0067] This embodiment provides a thermally closed-cell composite diaphragm, which includes a heat-sensitive coating, a polyethylene diaphragm (Celgard 2730) and a heat-sensitive coating arranged in sequence;
[0068] The thickness of the heat-sensitive coating is 5 μm, including polyvinyl alcohol and heat-sensitive particles with a core-shell structure; the shell thickness of the heat-sensitive particles is 110 nm, and the average particle diameter of the core is 0.6 μm;
[0069] The shell layer of the thermosensitive particles includes polydopamine, and the core includes polystyrene and silicon dioxide; the particle diameter D of the polystyrene 50 is 0.3 μm, and the melting point is 110°C; the particle size D of the silica 50 0.7μm, the specific surface area is 5m 2 / g; The mass ratio of polystyrene, silicon dioxide and polyvinyl alcohol is 4.5:5:0.5;
[0070] The preparation method of the thermally closed-cell composite diaphragm comprises the following steps:
[0071] ...
Embodiment 2
[0076] This embodiment provides a thermally closed-cell composite diaphragm, which includes a heat-sensitive coating, a polypropylene diaphragm, and a heat-sensitive coating arranged in sequence;
[0077] The thickness of the heat-sensitive coating is 1 μm, including heat-sensitive particles with a core-shell structure and polyacrylonitrile; the shell thickness of the heat-sensitive particles is 20 nm, and the average particle diameter of the core is 0.2 μm;
[0078] The shell layer of the heat-sensitive particles includes polydopamine, and the core includes polyethylene and aluminum oxide; the particle size D of the polyethylene 50 is 0.5 μm, and the melting point is 100°C; the particle size of the alumina is D 50 0.2μm, the specific surface area is 8m 2 / g; The mass ratio of polyethylene, aluminum oxide and polyacrylonitrile is 1:8.9:0.1;
[0079] The preparation method of the thermally closed-cell composite diaphragm comprises the following steps:
[0080] At a stirring ...
Embodiment 3
[0084] This embodiment provides a thermally closed-cell composite diaphragm, which includes a heat-sensitive coating, a polyethylene diaphragm, and a heat-sensitive coating arranged in sequence;
[0085] The thickness of the heat-sensitive coating is 10 μm, including heat-sensitive particles with a core-shell structure and polyvinyl alcohol; the shell thickness of the heat-sensitive particles is 200 nm, and the average particle diameter of the core is 1.0 μm;
[0086] The shell layer of the heat-sensitive particles includes polydopamine, and the core includes polylactic acid and magnesium hydroxide; the particle diameter of the polylactic acid is D 50 is 0.1 μm, and the melting point is 120°C; the particle size D of the magnesium hydroxide 50 1.2μm, the specific surface area is 2m 2 / g; The mass ratio of polylactic acid, magnesium hydroxide and polyvinyl alcohol is 4:5:1;
[0087] The preparation method of the thermally closed-cell composite diaphragm comprises the following...
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Abstract
Description
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Application Information
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