Wide-temperature-range high-performance primary lithium-manganese battery and preparation method thereof

Abstract

The invention discloses a wide-temperature high-performance primary lithium-manganese battery and a preparation method thereof, which are applied to a temperature environment of -50 to 75 DEG C. A positive plate and a negative plate are respectively a manganese dioxide positive plate and a lithium-carbon composite negative plate, positive plate reserved tabs are arranged on the front and back surfaces of the positive plate, and negative plate reserved tabs are arranged on the front and back surfaces of the negative plate; through application of preferred materials and preferred process technologies, the beneficial effects are fully illustrated, the discharge voltage platform and the discharge current multiplying power of the lithium-manganese battery are effectively improved, effective application in ultralow-temperature and high-temperature environments is met; meanwhile, the safety risk caused by using a metal lithium strip in the negative electrode preparation process of the conventional process is effectively avoided, and the method is very suitable for being applied to the fields of power consumption type electronic digital, special exploration, starting power supplies, military equipment power supplies and the like.

Description

Technical field: [0001] The invention relates to the technical field of primary lithium batteries, in particular to a wide-temperature high-performance primary lithium-manganese battery and a preparation method thereof. Background technique: [0002] The primary lithium-manganese battery is widely used in the market because of its stable voltage platform, long storage time, and wide temperature range. At present, the temperature range of primary lithium-manganese batteries on the market is -20°C to 60°C, which is difficult to meet the application needs of consumer electronic digital, special exploration, start-up power supply and military equipment power supply. [0003] The key to increasing the wide temperature use range of primary lithium-manganese batteries is to improve the discharge performance of primary lithium-manganese batteries. The paste electrolytic manganese dioxide is extruded on the current collector to form a positive electrode coating. The positive electro...

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Problems solved by technology

At present, the temperature range of primary lithium-manganese batteries on the market is -20°C to 60°C, which is difficult to meet the application needs of consumer electronic digital, special exploration, starting power supply and military equipment power supply.

[0003] The key to increasing the wide temperature use range of primary lithium-manganese batteries is to improve the discharge performance of primary lithium-manganese batteries. The paste electrolytic manganese dioxide is extruded on the current collector to form a positive electrode coating. The positive electrode coating is relatively fluffy on the current collector and has a low density. Moreover, the contact surface between the manganese dioxide particles and the current collector is small, and the internal resistance increases. Affect the discharge characteristics of primary lithium-manganese batteries; 2. Traditional metal lithium strips are used as negative electrode materials for lithium-manganese batteries. On the other hand, the chemical properties of metal lithium strips are relatively active. When metal lithium strips are processed as negative electrodes, they are easy to chemically react with moisture in the preparation environment, resulting in poor electrochemical performance of negative electrodes. 3. The application range of the electrolyte temperature in the prior art is relatively narrow. In an ultra-low temperature environment, the compatibility between the electrolyte and the primary lithium-manganese battery is low, resulting in poor fluidity of the electrolyte in the battery and reducing the LI+ in the electrolyte. Migration flexibility; in a high temperature environment, the electrolyte is easy to volatilize, and dry areas are prone to appear inside the battery; 4. In the prior art, when the positive electrode and the negative electrode are connected to the external current collector, most of them use external electrodes. In the way of ear welding, the internal resistance of the battery is relatively high; 5. In the prior art, in the manufacturing process of the primary lithium-manganese battery, the moisture control inside the battery is insufficient, which easily leads to the presence of moisture in the primary lithium-manganese battery. This will cause the decomposition of the electrolyte and a series of adverse reactions, resulting in damage to the interior of the battery, affecting the quality of the primary lithium-manganese battery in a wide temperature environment.

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