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A kind of preparation method of high nickel content lithium ion battery cathode material

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of synthesizing high-nickel materials restricting development speed, lack of large-scale production and application, and harsh synthesis conditions for high-nickel materials, etc. To achieve the effect of low requirements for synthesis equipment, high tap density and good processing performance

Active Publication Date: 2015-09-09
HUNAN CHANGYUAN LICO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conditions for the synthesis of high-nickel materials are harsh, not only the synthesis atmosphere is strict, but the synthesis temperature range is narrow, and it is difficult to obtain all electrochemically active α-NaFeO during synthesis. 2 Nickel-based cathode materials with layered crystal structure
During synthesis, divalent nickel is difficult to be oxidized to trivalent nickel to generate stoichiometric materials. Usually, a small amount of divalent nickel occupies the lattice points of trivalent nickel. Nickel will also enter the lithium layer, resulting in the mixing of cations, reducing the capacity and stability
Therefore, various difficulties in synthesizing high-nickel materials have restricted its development speed, and there is no large-scale production and application so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of high nickel content lithium ion battery positive electrode material of the present invention, comprises the following steps:

[0023] (1) Pretreatment of precursors: The nickel-cobalt-aluminum hydroxide precursor whose nickel content accounts for 80% of the total metal molar mass is calcined in an atmosphere muffle furnace at a calcination temperature of 550°C for 10 hours. Introduce dry air into the muffle furnace, and cool down with the furnace after calcination to obtain high-valent nickel oxides;

[0024] (2) Wet mixing: mix the high-valent nickel oxide and lithium hydroxide aqueous solution for slurry preparation, the ratio of the total molar amount of metal in the high-valent nickel oxide to the molar amount of lithium in lithium hydroxide is 1:1.03, Spray drying is carried out after the pulping is completed. The pressure in the spray tower is -60kPa, the inlet temperature is 340°C, and the outlet temperature is 125°C. The material obtained...

Embodiment 2

[0028] A kind of preparation method of high-nickel-content lithium-ion battery cathode material of the present invention, compared with the step of embodiment 1, except the ratio of the molar weight of total metal in the oxide of high-valent nickel to the molar weight of lithium in lithium hydroxide is 1 : Except for 1.08, other steps were the same.

[0029] After testing, the tap density of the high-nickel content lithium-ion battery positive electrode material prepared by the method of this embodiment is 2.81g / cm 3 , the positive electrode material has excellent processing performance. When it is made into a battery, the capacity is 197mAh / g, and the 500-cycle 1C, 2.8V~4.2V charge-discharge capacity retention rate is 81.1%. The battery performance is good, and there is no bad change such as swelling.

Embodiment 3

[0031] A preparation method of high nickel content lithium ion battery positive electrode material of the present invention, comprises the following steps:

[0032] (1) Pretreatment of precursor: same as step (1) of Example 1;

[0033] (2) Dry blending: Vacuum treat lithium hydroxide with a particle size of -150 μm at 180°C for 5 hours at a vacuum degree of -50kPa, then mix high-valent nickel oxide with lithium hydroxide after vacuum treatment (high-valent The ratio of the total molar weight of metal in nickel oxide to the molar weight of lithium in lithium hydroxide is 1:1.08) to obtain a mixture;

[0034] (3) Sintering: Same as step (3) of Example 1.

[0035] After testing, the tap density of the high-nickel-content lithium-ion battery cathode material prepared by the method of this embodiment is 2.90 g / cm 3 , the positive electrode material has excellent processing performance. When it is made into a battery, the capacity is 202mAh / g, and the 500-cycle 1C, 2.8V~4.2V charg...

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Abstract

The invention discloses a preparation method of a high-nickel-content anode material for a lithium ion battery. The method comprises the steps of calcining a synthesized high-nickel precursor, supplying non-reducing gas during calcining, obtaining high-valence nickel oxide, mixing high-valence nickel oxide with a lithium source in a wet mixing or dry mixing mode, obtaining a mixture, conducting segmented sintering on the mixture at an oxygen atmosphere, and obtaining the high-nickel-content anode material for the lithium ion battery. The high-nickel-content anode material for the lithium ion battery prepared with the method has the characteristic of high capacity, and also has good cycling stability and processability. The preparation method is high in production automation degree, avoids pollution to the environment, and has a very wide market prospect.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a battery, in particular to a preparation method of a high nickel content lithium ion battery positive electrode material. Background technique [0002] Energy, resources and the environment are important issues facing human beings. With the development of industry, the homeland on which human beings depend for survival - the resources on the earth are becoming increasingly exhausted, and the energy crisis is becoming more and more serious. Lithium-ion batteries have developed rapidly under the background of protecting the environment and saving non-renewable energy, and have now involved in daily life, industrial production, military defense, aerospace and other fields. [0003] With the advancement of science and technology, people's requirements for lithium-ion batteries are also getting higher and higher. On the one hand, people need lithium-ion secondary batteries ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525
CPCY02E60/122Y02E60/10
Inventor 周新东周友元胡柳泉黄承焕周耀张帆
Owner HUNAN CHANGYUAN LICO CO LTD
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