A lithium transition metal oxide battery

Abstract

The invention provides a lithium transition metal oxide battery, including a negative electrode sheet and a positive electrode sheet; the negative electrode sheet includes a negative electrode active material layer, a negative electrode current collector Cu foil, and a negative electrode conductive coating, and the conductive coating is coated on the negative electrode collector. On the fluid Cu foil, the negative electrode active material layer is located on the conductive coating, and the negative electrode active material layer includes a mixture of graphite and hard carbon, a negative electrode binder, and a negative electrode conductive agent; the positive electrode sheet includes a positive electrode active material layer, a positive electrode current collector Al foil, positive electrode conductive coating, the conductive coating is coated on the positive electrode current collector Al foil, the positive electrode active material layer is located on the conductive coating, the positive electrode active material layer includes lithium transition metal oxide, positive electrode binder, positive electrode conductive agent . The lithium transition metal oxide battery of the present invention improves the high-rate charging and discharging performance of the battery, prolongs the service life of the battery, and enables the battery to be better used in electric bicycles, electric vehicles, and energy storage power stations.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to a lithium transition metal oxide battery. Background technique [0002] Known as clean energy and high-efficiency energy, lithium battery energy has been popular in the market since its successful development. Among them, lithium-ion batteries have been developing rapidly in recent years and are widely used in various industries. With the development of emerging industries such as electric bicycles, electric vehicles, and energy storage power stations, higher requirements are placed on the power and life of lithium-ion batteries. [0003] Lithium-ion battery positive and negative electrode materials are lithium ions, lithium ion intercalation compound with layered or tunnel structure that can be freely inserted and extracted. Graphite materials have the advantages of high first-time efficiency, high lithium intercalation capacity, low lithium intercalation potential, abundant resources,...

AI Technical Summary

Problems solved by technology

Graphite materials have the advantages of high first-time efficiency, high lithium intercalation capacity, low lithium intercalation potential, abundant resources, and low price. At the same time, there are some defects: first, graphite materials show large volume changes during the process of lithium intercalation and deintercalation. During the cycle of the battery, a large stress is generated between the carbon material particles, which leads to powder loss of the negative electrode and poor cycle life; secondly, the graphite material has a complete sheet structure and can only insert lithium from the end face, and the high-current charge and discharge performance is low

Hard carbon materials have some characteristics that are completely different from graphite materials. The advantages of hard carbon are low temperature power and cycle performance, but its initial efficiency is low and processing performance is poor.

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