Lithium ion power battery and preparation method thereof

Abstract

The invention discloses a lithium ion power battery and a preparation method thereof. According to the invention, the cathode pole piece of the lithium ion power battery comprises, on a mass percentage basis, 83 to 94% of lithium titanate, 2 to 10% of an adhesive and 3 to 10% of a conductive agent; the anode material of the lithium ion power battery comprises, on a mass percentage basis, 83 to 95% of nickel-cobalt-lithium manganese, 1 to 10% of an adhesive and 4 to 12% of a conductive agent. Lithium titanate (Li4Ti5O12) is used as an active substance of the cathode of the lithium ion power battery in the invention, and nickel-cobalt-lithium manganese is used as an active substance of the anode; the lithium ion power battery has the advantages of great capacity, an excellent charge-discharge rate, a long cycle life and high volumetric specific energy; the preparation method provided in the invention has the advantages of low cost and a simple and practicable process.

Description

technical field [0001] The invention relates to a lithium ion power battery and a preparation method of the lithium ion power battery. Background technique [0002] The world's energy and environmental protection situation is becoming increasingly tense, and batteries are increasingly favored by people as a new energy source. Due to its high energy density, light volume, small weight, environmental protection and pollution-free, lithium-ion batteries have become the main direction of new energy development. With the rapid development of electric vehicles, space technology, national defense industry, and power storage systems, higher requirements are put forward for the specific capacity, cycle life, and safety of secondary batteries, and the electrochemical performance of batteries is improved. It can start with electrode materials and other aspects. [0003] Traditional lithium-ion batteries all use graphite as the main active material of the negative electrode material. ...

AI Technical Summary

Problems solved by technology

[0005] The positive electrode material is also an important part of lithium-ion power batteries. The first positive electrode material industrialized by Sony mainly uses lithium cobalt oxide (LiCoO 2 ), and now because cobalt resources are becoming more and more scarce, its price is getting higher and higher, at the same time, its thermal stability is poor, its safety performance is not good, and it also has a greater destructive effect on the environment. Therefore, more and more Researchers and engineers have turned their attention to other positive electrode materials, and the positive electrode materials that have attracted much attention for lithium-ion power batteries include LiNiO 2 , LiMn 2 o 4 、LiFePO 4 etc., LiNiO 2 The capacity is large, but it is difficult to prepare, it is difficult to obtain a relatively pure substance, and its safety performance is not good; LiMn 2 o 4 The price is relatively cheap, and the safety performance is good. However, its cycle performance is poor, the capacity is not high, and the high temperature performance is not good. LiFePO 4 It does not contain precious elements, the raw materials are cheap, and the resources are extremely rich; the working voltage is moderate, the voltage is relatively stable, the theoretical capacity is large, the structure is stable, and the safety performance is also good, but its voltage is low, the volume specific energy is small, and the use in series requires more battery, which directly increases the manufacturing cost of the battery pack

Images