A kind of method of conductive polymer coating nickel cobalt lithium manganese oxide cathode material

Abstract

The invention discloses a method for coating a conductive polymer on a Ni-Co-Mn acid lithium positive electrode material, and relates to the technical field of electrode materials of lithium ion batteries and preparation. The method comprises the following steps: (1) preparing LiNi1 / 3Co1 / 3Mn1 / 3 precursor mixed liquid by means of mechanical activation; (2) adding aqueous solution or organic solution of the conductive polymer into the LiNi1 / 3Co1 / 3Mn1 / 3 precursor mixed liquid; (3) performing spray drying on the mixture prepared in the step (2) to obtain precursor powder which is uniformly mixed; and (4) calcining the precursor powder which is subjected to jolt ramming or compaction, and cooling to a room temperature to obtain a conductive polymer coated Ni-Co-Mn acid lithium positive electrode material. According to the method, the conductive polymer is coated on the surface of the Ni-Co-Mn acid lithium positive electrode material, the dissolution of transition metals in the positive electrode material in electrolytes during charging / discharging circulation is inhibited, and the battery cycle performance and capacity retention ratio of the positive electrode material are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrode materials and preparation thereof, in particular to a method for coating nickel-cobalt lithium manganese oxide cathode materials with conductive polymers. Background technique [0002] With the continuous progress of society, people have continuously put forward a series of new requirements for chemical power sources such as light weight, small size, high energy, safe use and environmental friendliness. Traditional chemical batteries are far from being able to meet these requirements, so research and development of new chemical power sources with high energy density, long service life, safety and pollution-free has become an urgent requirement. The secondary lithium-ion battery is a new type of high-energy battery with lithium-intercalated compounds as the positive and negative electrode materials. It has a series of advantages such as high specific energy, high voltage, smal...

AI Technical Summary

Problems solved by technology

At present, the commonly used coating material is conductive carbon, but in the surface carbon coating method, there are usually disadvantages such as long operation time, uneven mixing, high subsequent heat treatment temperature, and the need for inert gas protection.

At present, there is no related report on coating conductive polymer on the surface of nickel-cobalt-lithium manganese oxide to improve the poor cycle performance and unstable electrochemical performance of electrode materials.