Capacitive type lithium manganate power lithium-ion battery

Abstract

The invention discloses a capacitive type lithium manganate power lithium-ion battery. The capacitive type lithium manganate power lithium-ion battery comprises positive electrode plates, negative electrode plates and a membrane, wherein the positive electrode plates, the negative electrode plates and the membrane are wound or laminated with one another at intervals, the membrane is arranged between the positive electrode plates and the negative electrode plates, the positive electrode plates are capacitive type positive electrode plates, the capacitive type positive electrode plates are of three-layer composite structures, each positive electrode plate comprises a supercapacitor positive electrode layer, a lithium-ion battery positive electrode layer and a positive electrode current collector layer, the supercapacitor positive electrode layer and the lithium-ion battery positive electrode layer are respectively coated on a negative surface and a positive surface of a positive electrode current collector, the supercapacitor positive electrode layer is an activated carbon electrode material layer, the lithium-ion battery positive electrode layer is a lithium manganate positive electrode material layer, and the negative electrode layer is a mixture of a natural graphite layer, an artificial graphite layer, soft carbon and hard carbon. The capacitive type lithium manganate power lithium-ion battery disclosed by the invention has the characteristics of high device applicability, excellent performance, moderate quality, high production efficiency and low cost, and is convenient to process.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a capacitive lithium manganate power lithium ion battery. Background technique [0002] With the rapid development of informatization and intelligence in modern society, as well as the increasingly serious environmental pollution and energy shortage, the society has higher and higher requirements for the capacity and output power of storage devices, and lithium-ion batteries and capacitors have become current research hotspots. Lithium-ion batteries have the advantages of high energy density and low self-discharge rate, but the rate performance is not ideal, the power density is low, and the voltage range of lithium-ion batteries is between 3.0 and 4.1V. When it is higher than 4.1V, the positive electrode material of the battery And the electrolyte is unstable and easy to oxidize, and the surface of the negative electrode is easy to decompose lithium to form lithium...

AI Technical Summary

Problems solved by technology

However, in its technical proposal, activated carbon accounts for 5.0% to 50.0% of the capacity of the positive active material, and A-type materials such as soft carbon or hard carbon account for 50.0 to 95.0% of the capacity of the negative active material, seriously reducing the capacity of lithium-ion batteries. energy density; moreover, when A-type materials such as soft carbon or hard carbon are added to the negative electrode material and activated carbon is added to the positive electrode material, it needs to be added during the mixing process of the positive electrode and the negative electrode during the processing process, which is not only difficult to process but not conducive to production The efficiency is improved, and many uncertain factors are caused to the beating process of the positive and negative electrodes. The product quality is heavily dependent on the uniformity of the mixing pulp, and the quality risk is too high

[0004] At the same time, lithium manganese oxide, as a commonly used cathode material for lithium-ion batteries, has the characteristics of low cost, safety and good low-temperature performance, but its material itself is not very stable, easy to decompose and generate gas, and its cycle life decays quickly. Prone to bulging, poor high-temperature performance, and relatively short life, which directly limit the popularization and application of lithium manganate in lithium-ion batteries

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