High-safety primary lithium-manganese battery and preparation method thereof

Abstract

The invention discloses a high-safety primary lithium-manganese battery and a preparation method thereof. The primary lithium-manganese battery comprises a positive plate, a negative plate, a ceramicdiaphragm, electrolyte and a battery shell, and the positive plate, the ceramic diaphragm, the negative plate and the ceramic diaphragm are sequentially and repeatedly stacked to form a dry battery cell; the primary lithium-manganese battery is prepared by putting a dry battery cell into a battery shell, injecting electrolyte, aging, sealing and aging, and is characterized in that a negative plateis subjected to electrochemical lithium pre-doping, so that a 'fully charged secondary lithium battery negative plate' or a 'zero charged lithium/carbon half battery positive plate' is converted intoa pre-lithiated negative plate; positive plate reserved tabs are arranged on front face and back face of positive plate, and negative plate reserved tabs are arranged on front face and back face of negative plate. According to the primary lithium-manganese battery disclosed by the invention, after the primary lithium-manganese battery is subjected to impact, extrusion and needling tests, the phenomena of firing, deflagration and explosion are avoided, and the safety performance of the primary lithium-manganese battery is higher than that of the traditional primary lithium-manganese battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a high-safety primary lithium-manganese battery and a preparation method thereof. Background technique [0002] Due to its high voltage platform, high energy density, low self-discharge rate and long storage time, lithium-manganese batteries are more and more widely used in the market. However, there are still certain safety hazards in the use of traditional lithium-manganese batteries, mainly: when lithium-manganese batteries are hit by heavy objects, squeezed, acupunctured, etc., it is very easy to cause safety accidents such as fire, deflagration, and explosion. [0003] The main factors affecting the safety performance of lithium-manganese batteries are: ① Traditional lithium-manganese batteries use metal lithium strips as negative electrodes. Because metal lithium is very active, when the battery is subjected to external forces, the internal metal lithium and elect...

AI Technical Summary

Problems solved by technology

However, there are still certain safety hazards in the use of traditional lithium-manganese batteries, mainly: when lithium-manganese batteries are hit by heavy objects, squeezed, acupunctured, etc., it is very easy to cause safety accidents such as fire, deflagration, and explosion

[0003] The main factors affecting the safety performance of lithium-manganese batteries are: ① Traditional lithium-manganese batteries use metal lithium strips as negative electrodes. Because metal lithium is very active, when the battery is subjected to external forces, the internal metal lithium and electrolyte are exposed to When in the air, metal lithium easily reacts with oxygen, nitrogen, and moisture in the air, especially reacts with water to produce hydrogen, and the organic solvent in the electrolyte also undergoes a series of decomposition reactions at the same time, which can easily cause fire and deflagration of the battery and explosion; ②The traditional lithium-manganese battery uses ordinary polypropylene diaphragm with low melting point. When the internal temperature rise is too high, ordinary diaphragms are easy to shrink and break holes, resulting in direct contact between the positive electrode and the negative electrode, causing a short circuit, which quickly triggers fire, deflagration and explosion of the battery; ③The electrolyte used by traditional lithium-manganese battery manufacturers Most of them are outsourced, lacking the independent research and development and design of the electrolyte in terms of safety performance, so that the batteries made of outsourced electrolytes have safety hazards such as elevated working temperature, volatile and decomposed electrolytes, and flammable and explosive batteries; ④Battery The unreasonable manufacturing process leads to high internal resistance of the battery, which increases the heat generation of the battery during operation and reduces the safety and stability of the battery

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