Lithium nickel manganese oxide/lithium titanate battery and preparation method thereof

Abstract

The invention discloses a LiNi0.5Mn1.5O4 / lithium titanate battery and a preparation method thereof, and the battery has not only relatively high energy density but also favorable cycle performance, safety performance and quick charging and low-temperature charging capabilities. The technical scheme is that the mass ratio of anode slurry is that LiNi0.5Mn1.5O4: conductive carbon Super-p: conductive carbon KS-15: binder PVDF=95:1:1:3, and the solvent is NMP; the mass ratio of cathode slurry is (Li4Ti5O12): conductive carbon Super-p: conductive carbon KS-15: binder PVDF=91:3:2:4, and the solvent os NMP. The invention has the advantages that as lithium titanate which is a zero-strain material and has low probability of generating lithium dendrites serves as the cathode active substance of the battery, the battery has better safety performance, rate performance, low-temperature performance and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a preparation method of a lithium nickel manganese oxide / lithium titanate battery. Background technique [0002] At present, with the advancement of science and technology and the continuous improvement of human demand for new energy, the performance of lithium-ion batteries is also improving, especially now that new energy vehicles have higher requirements for lithium-ion batteries. To solve its safety problems, it also needs to improve its low temperature and fast charging capabilities. There are still some disadvantages in commercial graphite negative lithium-ion batteries, such as lithium dendrites are easy to form during overcharging, causing short circuit of the battery and affecting the safety performance of the battery; SEI film is easy to form, resulting in low initial charge and discharge efficiency and large irreversible capacity; The material platform is ...

AI Technical Summary

Problems solved by technology

There are still some disadvantages in commercial graphite negative lithium-ion batteries, such as lithium dendrites are easy to form during overcharging, causing short circuit of the battery and affecting the safety performance of the battery; SEI film is easy to form, resulting in low initial charge and discharge efficiency and large irreversible capacity; The material platform is low, which can easily cause the electrolyte to decompose, causing safety hazards, etc.

Lithium titanate is a zero-strain material with high potential, which is not easy to produce lithium branch crystals, has better safety performance, and has stronger fast charging and low-temperature charging capabilities. However, due to its high potential, lithium iron phosphate, ternary, lithium manganate, etc. The nominal voltage of the positive electrode system battery is low, only 2.0V~2.5V, and the energy density of the corresponding battery is low

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