Heat shrinkage-resistant lithium-ion battery separator

A technology for lithium ion batteries and battery separators, which is applied in the field of battery separator preparation, can solve the problems of incomplete sealing of pore formers, different product quality and morphology, unfavorable new battery separators, etc., and achieves excellent mechanical strength, porosity and ventilation. The effect of high temperature and low thermal shrinkage
CN106328867AActive Publication Date: 2017-01-11LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
Publication Date
2017-01-11

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Abstract

The invention discloses a heat shrinkage-resistant lithium-ion battery separator, which comprises a first outer layer, a second outer layer and an inner layer clamped between the first outer layer and the second outer layer, wherein the first outer layer, the second outer layer and the inner layer have different micropore structures. The heat shrinkage-resistant lithium-ion battery separator disclosed by the invention has excellent heat shrinkage resistance and good overall performance, has high puncture strength and tensile strength when reaching a relatively low thickness, can be applied to a relatively small battery and is not easily damaged in the installation process; a plurality of physical properties are taken into account; meanwhile, the heat shrinkage-resistant lithium-ion battery separator has good air permeability and porosity and small internal resistance; the capacity and the cycle performance of the battery are improved; and furthermore, the heat shrinkage-resistant lithium-ion battery separator also has relatively low closed pore temperature and membrane rupture temperature and high safety.
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Description

technical field

[0001] The invention relates to a preparation process of a battery diaphragm, in particular to a heat-shrinkable lithium-ion battery diaphragm and a preparation method thereof. Background technique

[0002] Lithium-ion batteries are widely used in the fields of electronic communication, energy storage, and power supply. They are mainly composed of positive electrodes, negative electrodes, electrolytes, and battery separators. And the short circuit allows the electrolyte ions to pass through at the same time, thereby generating current. The current battery separator is mostly a polyethylene composition film with a microporous structure, and its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity and cycle of the battery. As well as safety performance and other characteristics, a battery separator with excellent performance plays an important role in improving the overall performance of the ...

Claims

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