Lithium-ion battery

Abstract

The invention discloses a lithium-ion battery, which comprises a positive electrode, a negative electrode and a membrane arranged between the positive electrode and the negative electrode, wherein thenegative electrode is a copper oxide-graphene oxide composite material / aetylene black / polyvinylidene fluoride; copper oxide directly grows in graphene oxide through the copper oxide-graphene oxide composite material by adopting a hydrothermal method; and the membrane is copper oxide / polyvinylidene fluoride-hexafluoropropylene. According to the lithium-ion battery, the copper oxide directly growsin the graphene oxide by adopting the hydrothermal method, so that the condition that the electron conductivity is relatively low due to the fact that the copper oxide is directly mixed with a carbonmaterial and is not closely combined is avoided; and the copper oxide is doped into the membrane, so that the structural strength of the membrane is improved. The ratio of an amorphous phase of the polyvinylidene fluoride-hexafluoropropylene membrane is improved, so that formation of holes of the membrane of the lithium-ion battery is facilitated; and the negative electrode and the membrane of thelithium battery generate synergistic effects through the copper oxide in the negative electrode and the copper oxide in the membrane.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium ion battery. Background technique [0002] Lithium-ion batteries have long been widely used in various portable electronic devices and electric vehicles, but the electrochemical performance of batteries is often limited by the performance of electrodes. Therefore, it is necessary to find a new electrode material with high performance, high cycle and high rate. The challenges we face. Copper oxide (CuO) has attracted special attention due to its high theoretical capacity (674mAh / g), low toxicity, and high natural abundance, but copper oxide electrodes suffer from low conductivity and large volume expansion during charge and discharge. problems, resulting in limited cycle performance of copper oxide anode materials. In order to solve these problems, the volume expansion is suppressed and the stability of the material is improved by directly adding carbon mater...

AI Technical Summary

Problems solved by technology

However, the copper oxide in the negative electrode treated in this way is usually not tightly combined with the carbon material, and the electron conductivity is still relatively low.

Secondly, the lithium battery separator is an important part of the battery structure. The traditional Celgard commercial separator has seriously affected the performance of the battery due to its poor thermal stability and low liquid absorption.

Moreover, in the traditional battery structure, both the negative electrode and the separator perform their own duties, and there is no synergistic effect.

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