Capacitive type lithium cobalt oxide power battery

Abstract

The invention discloses a capacitive type lithium cobalt oxide power battery. The lithium cobalt oxide power battery comprises a positive plate, a negative plate and a diaphragm; the positive plate, the negative plate and the diaphragm are coiled or laminated at intervals; the diaphragm is arranged between the positive plate and the negative plate; the positive plate is a capacitive type positive plate; the capacitive type positive plate adopts a three-layer composite structure; the positive electrode pole piece comprises a supercapacitor positive electrode layer, a lithium ion battery positive electrode layer and a positive electrode current collector layer; the negative electrode surface and the positive electrode surface of the positive electrode current collector are coated with the supercapacitor positive electrode layer and the lithium ion battery positive electrode layer respectively; the supercapacitor positive electrode layer is an active carbon electrode material layer; the lithium ion battery positive electrode layer is a lithium cobalt oxide positive electrode material layer; the negative electrode material layer is a mixture of natural graphite, synthetic graphite, soft carbon and hard carbon, wherein the soft carbon and the hard carbon account for 50-95% of the mixture in percentage by mass. The capacitive type lithium cobalt oxide power battery has the characteristics of high applicability, excellent performance, good quality, convenient processing, high production efficiency and low cost.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a capacitive lithium cobalt oxide power 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 dendrite...

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 cobalt oxide, as the earliest commercially used cathode material for lithium-ion batteries, has the characteristics of stable structure, high capacity ratio, and outstanding comprehensive performance. Popularization and Application of Lithium Cobalt Oxide in the Field of Lithium-ion Batteries

Images