Lithium transition-metal oxide cell

Abstract

The invention provides a lithium transition-metal oxide cell. The lithium transition-metal oxide cell comprises a negative plate and a positive plate. The negative plate comprises a negative active substance layer, negative current collector Cu foil and a negative conductive coating. The negative current collector Cu foil is coated with the negative conductive coating. The negative active substance layer is located on the negative conductive coating. The negative active substance layer comprises a mixture of graphite and hard carbon, a negative pole binder and a negative pole conductive agent. The positive plate comprises a positive active substance layer, positive current collector Al foil and a positive conductive coating. The positive current collector Al foil is coated with the positive conductive coating. The positive active substance layer is located on the positive conductive coating. The positive active substance layer comprises a lithium transition-metal oxide, a positive pole binder and a positive conductive agent. The lithium transition-metal oxide cell improves cell high-rate charge-discharge performances, prolongs a cell service life and can be used for electric bicycles, electric automobiles 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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