Method for preparing positive electrode materials NCM811 with uniform particle sizes for lithium batteries

Abstract

The invention discloses a method for preparing positive electrode materials NCM811 with uniform particle sizes for lithium batteries. Gel is formed from resorcinol, formaldehyde and metal acetate under hydrothermal reaction conditions; freeze-drying is carried out. The method includes steps of 1), preparing precursors; 2), preparing the positive electrode materials LiNi<0.8>Co<0.1>Mn<0.1>O<2>. Themethod has the advantages that metal ions can be uniformly mixed with one another, accordingly, the positive electrode materials LiNi<0.8>Co<0.1>Mn<0.1>O<2> with the high crystallinity for lithium ion batteries can be synthesized, I(003) / I(004) ratios of the positive electrode materials LiNi<0.8>Co<0.1>Mn<0.1>O<2> range from 1.55 to 1.76, and the particle sizes of the positive electrode materialsLiNi<0.8>Co<0.1>Mn<0.1>O<2> are uniformly distributed between the ranges from 500 nm to 900 nm; the positive electrode materials obtained by the aid of gelation and calcination two-step processes arelow in positive ion mixing degree; calcination conditions can be lowered as compared with high-temperature solid-phase processes and co-precipitation processes, mixed phase generation can be reduced,harsh conditions and steps on synthesis atmosphere and the like can be lowered, energy consumption and the cost can be effectively reduced, and the method includes simple technologies and is low in cost; the positive electrode materials NCM811 are excellent in electrochemical performance, cycle stability and specific capacity performance, and accordingly the method has an industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a method for preparing lithium battery cathode material NCM811 with uniform particle size. Background technique [0002] With the increasing shortage of global energy and resources, the development of new energy materials has become a hot spot in the world today. Lithium-ion batteries are favored by the field of new energy due to their advantages such as high specific capacity, long cycle life, small size and less environmental pollution. In lithium-ion batteries, the cathode material is an important factor affecting the cost and performance of the battery. Therefore, research on new cathode materials has become a current research hotspot. [0003] At present, the most widely used cathode materials for lithium-ion batteries mainly include LiCoO 2 , LiNiO 2 , LiMnO 2 , LiMn 2 o 4 Wait. LiCoO 2 With the advantages of high working voltage, good cycle performance, excellent re...

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Problems solved by technology

[0010] For the existing cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 The synthesis route is complex, the synthesis conditions are harsh, and the synthesized cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 Uneven particle size distribution, high degree of cation mixing and other shortcomings, using a two-step method of gelation and calcination, using resorcinol, formaldehyde and metal acetate to form a gel under hydrothermal reaction conditions, freeze-drying protection The microstructure of the gel is not destroyed, and the metal ions are uniformly mixed; the purpose is to make the synthesized material have a uniform particle size distribution, high crystallinity, reduce the degree of cation mixing, optimize the synthesis route and reduce production costs

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