In-situ coating method of high-nickel ternary material

A high-nickel ternary material and in-situ coating technology, which is applied to electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of increased battery impedance, poor cycle performance, and low conductivity, and achieve suppressed capacity and Decrease in rate performance, suppression of generation, and improvement in cycle performance

Active Publication Date: 2016-04-20
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the cycle of the layered ternary material battery, due to the erosion and catalysis of the electrolyte, with the continuous insertion and extraction of lithium ions, a large number of NiO cubic phases will be generated on the surface of the high-nickel ternary material; high-potential discharge above 4.5V , it will accelerate the formation of NiO cubic phase on the surface of the material and the collapse of the material structure
Due to the low conductivity of NiO cubic phase electrons and lithium ions, the battery impedance will rise sharply, resulting in technical problems such as the reduction of capacity and rate performance of high-nickel ternary material batteries, and poor cycle performance.

Method used

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Effect test

Embodiment 1

[0027] A method for in-situ coating of a high-nickel ternary material, comprising the following process steps:

[0028] First, prepare 1L of dilute sulfuric acid solution with a volume fraction of 2%, add 1.2KgLiNi 0.5 Co 0。2 Mn 0.3 O 2 The ternary material was continuously stirred, treated at room temperature for 40 minutes, then filtered and washed with distilled water until the pH value reached 6 or more, and then placed in a nitrogen oven at 120 ° C, dried for 5 hours; the dried powder was mass ratio 1: 0.4% add 4.8g NaOH, then add 1L of distilled water, after stirring and mixing evenly, send it to a spray dryer for spray drying, the heating air pressure is 0.4MPa, the air inlet temperature is 300°C, the air outlet temperature is 100°C, and the inlet temperature is 100°C. The amount of material is 0.5L / h; after the spray drying is completed, it is sent to the sintering furnace, sintered in an air atmosphere for 3 hours, and the sintering temperature is 750 ° C. After th...

Embodiment 2

[0030] A method for in-situ coating of a high-nickel ternary material, comprising the following process steps:

[0031] First, prepare 1L of dilute nitric acid solution with a volume fraction of 3%, add 1.2KgLiNi 0.5 Co 0.2 Mn 0.3 O 2 The ternary material was stirred continuously, treated at room temperature for 30 minutes, then filtered and washed with distilled water until the pH value reached 6 or more, and then placed in a nitrogen oven at 120 ° C, dried for 6 hours; the dried powder was mass ratio 1: 0.5% add 6g NaOH, then add 1L of distilled water, stir and mix evenly, then send it to a spray dryer for spray drying, the heating air pressure is 0.5MPa, the inlet temperature is 300°C, and the outlet temperature is 100°C. The amount is 0.7L / h; after the spray drying is completed, it is sent to the sintering furnace, sintered in an air atmosphere for 5 hours, and the sintering temperature is 780 ℃. After the sintering is completed, the product is obtained by sieving.

Embodiment 3

[0033] A method for in-situ coating of a high-nickel ternary material, comprising the following process steps:

[0034] First, prepare 1L of dilute phosphoric acid solution with a volume fraction of 4%, add 1.2KgLiNi 0.6 Co 0。2 Mn 0.2 O 2The ternary material was stirred continuously, treated at room temperature for 20 minutes, then filtered and washed with distilled water until the pH value reached 6 or more, and then placed in a nitrogen oven at 130 ° C, dried for 7 hours; the dried powder was mass ratio 1: 0.4% add 4.8g NaOH, then add 1L of distilled water, after stirring and mixing evenly, send it to a spray dryer for spray drying, the heating air pressure is 0.4MPa, the air inlet temperature is 300°C, the air outlet temperature is 100°C, and the inlet temperature is 100°C. The amount of material is 0.5L / h; after the spray drying is completed, it is sent to the sintering furnace, sintered in an air atmosphere for 3 hours, and the sintering temperature is 850 ° C. After t...

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Abstract

The invention relates to an in-situ coating method of a high-nickel ternary material, and belongs to the technical field of anode materials of lithium ion batteries. The in-situ coating method of the high-nickel ternary material comprises the following processing steps of (1) acid treatment: adding anode material powder into an acid solution to carry out soaking acid treatment; (2) drying treatment: filtering, washing and drying the anode material powder which is subjected to the acid treatment; (3) sodium source preparation: adding a sodium source in the dried anode material according to a mass ratio of 1:(0.002 to 0.007), and uniformly mixing the anode material with distilled water according to a volume ratio of 1:(0.8 to 1.2); (4) spray drying: carrying out spray drying on a mixed solution in a spray drying machine; (5) sintering treatment: sintering dried powder in air atmosphere under 600 to 900 DEG C, wherein the sintering time is 2 to 5 hours; sieving after sintering, thus obtaining a product. The in-situ coating method disclosed by the invention has the advantages that the technology is simple, the reduction of the capacity and the rate capability of a battery is restricted, the cycle performance of the battery is increased, and the like.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to an in-situ coating method for high-nickel ternary materials. Background technique [0002] Lithium-ion secondary batteries have the advantages of high specific capacity, high operating voltage, wide operating temperature range, low self-discharge rate, long cycle life, no memory effect, no pollution, light weight, and good safety performance, so they are widely used in mobile phones, Mobile devices such as digital cameras and laptops. With the development of science and technology, most products tend to be portable and economical, which requires lithium-ion battery products to develop in the direction of high energy density. [0003] At present, the widely used lithium cobalt oxide has shortcomings such as shortage of resources and high price, and the space for further improving the energy density of lithium cobalt oxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘攀
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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