Highly dispersed hexagonal nanosheet structure nickel-cobalt-manganese ternary positive electrode material and preparation method thereof

Abstract

The invention relates to a high-dispersion nickel-cobalt-manganese ternary cathode material adopting a hexagonal nanosheet structure and a preparation method of the ternary cathode material. Accordingto the technical scheme, materials are blended in the mole ratio of nickel salt to cobalt salt to manganese salt being (1-x-y):x:y, a mixture I is obtained, the mixture I and deionized water are stirred, and a solution I is obtained; lithium salt and the mixture I are stirred in the mole ratio of the lithium salt to the mixture I being (10-30):1, and a solution II is obtained; the solution II issubjected to a hydrothermal reaction, cooling and washing are performed, a product is dried at 70-80 DEG C for 5-8 h, then put in a tubular atmosphere furnace, heated to 600-850 DEG C at the rate of 3-6 DEG C / min, kept at the constant temperature for 5-11 h and cooled with the furnace, and the high-dispersion nickel-cobalt-manganese ternary cathode material adopting the hexagonal nanosheet structure is prepared. The preparation method has the characteristics that the process is simple and easy and convenient to operate, the production cost is low, the method is environmentally friendly and industrial production can be realized; the prepared product is a single crystal material and has regular morphology, stable structure, high specific capacity, excellent cycle performance and good rate performance.

Description

technical field [0001] The invention belongs to the technical field of nickel-cobalt-manganese ternary cathode materials. In particular, it relates to a nickel-cobalt-manganese ternary cathode material with a highly dispersed hexagonal nanosheet structure and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. Since the 1970s, various high-energy lithium primary batteries with metal lithium as the negative electrode have come out and been widely used. Lithium-ion batteries have high working voltage, high specific energy, large capacity, small self-discharge, good cycle performance, long service life, light weight and small size. It is an ideal power source and is expected to become one of the main power sources for electric vehicles and cordless power tools in the future. The main structure of a lithium-ion battery inc...

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Problems solved by technology

Ding Chuxiong et al. (Ding Chuxiong et al. Research progress on ternary cathode materials for lithium-ion batteries. Chemical and Physical Power Systems, 2009) proposed that nickel-cobalt-manganese ternary materials are the same as LiCoO 2 In contrast, its conductivity is low, and the performance of large rate is not good; the tap density is low, which affects the volumetric energy density; the pursuit of high specific capacity and the use of high charge cut-off voltage lead to unstable cycle performance and serious capacity attenuation

Zou Bangkun et al. (Zou Bangkun et al. Research progress on ternary cathode materials for lithium-ion batteries. Chinese Science: Chemistry, 2014) pointed out that ternary materials have low initial charge and discharge efficiency and relatively complex synthesis processes

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