Lithium-iron battery diaphragm and lithium-iron diaphragm

Abstract

The invention provides a lithium-iron battery diaphragm and a lithium-iron battery, and relates to the technical field of separators, wherein the thickness of the diaphragm is 25-35[mu]m, and the porosity of the diaphragm is 40-50%, and the puncture strength of the diaphragm is 700-1200Mpa, which alleviates the technical problem that when is used in a lithium-iron battery, an existing diaphragm is easy to pierce, causing a micro-short circuit inside the battery, causing battery self-discharge, at the same time, it is easy to induce safety accidents, the lithium-iron battery diaphragm providedby the invention can not only ensure the transmission efficiency of electrolyte ions, but also avoid the dust and burr puncture on the positive electrode sheet of the lithium-iron battery, thus ensuring the safety of the lithium-iron battery, and meanwhile, the thickness of the lithium-iron battery diaphragm provided by the invention is moderate, so as to ensure the stability of the lithium-ironbattery in use.

Description

Technical field [0001] The invention relates to the technical field of diaphragms, in particular to a lithium-iron battery diaphragm and a lithium-iron battery. Background technique [0002] With the continuous advancement of electronic information technology, consumer electronic products continue to develop towards diversification, miniaturization, and high power. The performance requirements of all aspects of batteries are also rapidly increasing, requiring high energy density, high power density and price. Suitable, easy to use, low self-discharge rate, long storage life, especially for the energy density and power density of the battery puts forward higher and higher requirements. [0003] Secondary batteries have developed rapidly due to rechargeable and repeated use, but they cannot replace primary batteries due to their low primary capacity, high self-discharge rate, short storage time, poor safety performance, need to be recharged after use, and poor model versatility. The...

AI Technical Summary

Problems solved by technology

[0003] Secondary batteries have been rapidly developed because they can be recharged and reused, but they cannot replace primary batteries due to their low primary capacity, high self-discharge rate, short storage time, poor safety performance, need to be charged after use, unstandardized models, and poor versatility. The primary battery has developed rapidly in recent years due to its advantages of high primary capacity, slow discharge level, standardized model and good versatility.

[0005] The safety performance of lithium primary batteries has always been concerned, and the separator plays an important role in the safety of lithium primary batteries. However, the existing separators have high tensile strength and low puncture strength, making them suitable for use in lithium iron batteries , it is easy to be pierced by dust burrs on the positive electrode sheet, causing local micro-short circuit inside the battery, causing battery self-discharge, and battery life is significantly reduced. , and then cause a large area of ​​short circuit inside the battery, aggravate the accumulation of heat, cause thermal runaway, and cause the battery to burn or explode

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