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High-power lithium-ion positive electrode material and preparation method thereof

A cathode material, lithium-ion technology, applied in the field of high-power lithium-ion cathode materials and its preparation, can solve the problems of reducing the stability of the core nickel-cobalt-manganese ternary material, reducing battery performance, and the existence of coating voids, etc., to improve the structure Effects of stability and electrochemical performance, improvement of power performance, and improvement of electrical conductivity

Active Publication Date: 2014-10-08
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the usual coating method has uneven coating and coating voids, which will reduce the performance of the battery
For example, the invention with application number 201410004698.4 uses alumina coating to improve Ni during charging and discharging. 4+ The problem of direct contact with the electrolyte, but alumina itself is an insulating substance, which will reduce the activity of the positive electrode material
Moreover, since the crystal structure of the alumina coating is quite different from that of the positive electrode material, it is easy to fall off after a certain number of battery cycles, resulting in safety problems.
[0005] In addition, there is an invention with the application number 201310126568.3, which uses ternary materials as the core and ternary materials with low specific energy as the core, so that the specific energy of the positive electrode material is relatively low, and uses unstable binary materials as the outer shell, which reduces the Stability of core nickel-cobalt-manganese ternary materials

Method used

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  • High-power lithium-ion positive electrode material and preparation method thereof
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  • High-power lithium-ion positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] 1. Weigh nickel sulfate and cobalt sulfate crystals at a molar ratio of 9:1, dissolve them in water, mix the nickel sulfate solution and cobalt sulfate solution evenly, and the metal ion concentration is 2.0mol / L. The nickel-cobalt mixed solution is then fed into a continuous reaction kettle with 7mol / L ammonia water and 2mol / L potassium hydroxide solution in parallel. The reaction kettle is filled with bottom liquid with a pH value of 11.5 and a temperature of 50°C. The pH value of the reaction system was controlled at 11.5±0.02 by potassium hydroxide solution, the stirring speed was 500 r / min, and the reaction was carried out for 30 hours. When the pH value of the precipitated product is below 10.5 after washing, the washing is stopped and the slurry is dried. The dried precursor and magnesium oxide were sintered in an oxygen atmosphere at 750°C for 10 hours at a ratio of 1:0.05, and then crushed and classified to obtain the core material Ni 0.86 co 0.1 Mg 0.04 O. ...

Embodiment 2

[0066] (1) With embodiment 1 (1), only dopant is changed into TiO 2 , get Ni 0.86 co 0.1 Ti 0.04 o

[0067] (2) The inner core material that above-mentioned step (1) is made is dispersed in bottom liquid, then the potassium hydroxide solution that mixes uniform nickel, cobalt salt solution and 2mol / L ammoniacal liquor and 0.5mol / L also has lemon Sodium bicarbonate is added into the reaction kettle in parallel with the aluminum solution pre-complexed at 1:1, and the pH value of the reaction system is controlled at 10.5±0.02 by the potassium hydroxide solution. The stirring speed is 600r / min, and the reaction is heated at 60°C for 20h. The solution after the reaction is subjected to solid-liquid separation, the pH value of the precipitated product is below 10 after washing, the washing is stopped and the slurry is dried. The dried precursor and lithium hydroxide were sintered in an oxygen atmosphere at 850° C. for 20 hours at a ratio of 1:1.08, and then pulverized and class...

Embodiment 3

[0070] (1) With embodiment 1 (1), only dopant is changed into ZnO, obtains Ni 0.82 co 0.08 Zn 0.1 o 2 .

[0071] (2) The core material obtained in the above step 1) is dispersed in the bottom liquid, and then the mixed nickel, cobalt salt solution, ammoniacal liquor of 2mol / L and potassium hydroxide solution of 0.5mol / L also have sodium citrate According to the 1:1 pre-complexed aluminum solution co-flow into the reaction kettle, the pH value of the reaction system is controlled at 11±0.02 by the potassium hydroxide solution. The stirring speed was 500r / min, and the reaction was heated at 30°C for 40h. The solution after the reaction is subjected to solid-liquid separation, the pH value of the precipitated product is below 10 after washing, the washing is stopped and the slurry is dried. The dried precursor and lithium hydroxide were sintered in an oxygen atmosphere at 800°C for 30 hours at a ratio of 1:1.05, and then pulverized and classified to obtain a high-nickel cath...

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Abstract

The invention discloses a high-power lithium-ion positive electrode material and a preparation method thereof. The high-power lithium-ion positive electrode material is prepared by taking high-energy-density nickelic material as an inner core and taking a stable nickel-cobalt-aluminum-carbon layer as a shell. By virtue of the method for preparing a lithium-ion nickel series positive electrode material, the volumetric specific energy of the material is improved, the charging and discharging properties of the material are stabilized, and the effects of improving the capacity of the inner core and protecting the shell are highlighted in an optimal manner.

Description

technical field [0001] The invention belongs to the field of electrode materials, and in particular relates to a high-power lithium ion cathode material and a preparation method thereof. Background technique [0002] In lithium-ion battery cathode materials, LiNiO 2 It is considered as a promising cathode material due to its low cost and high specific capacity. LiNiO 2 The theoretical specific capacity of the battery is 274mAh / g, and the actual capacity has reached 190mAh / g~210mAh / g. The working voltage range is 2.5 ~ 4.2V. But LiNiO 2 The preparation conditions are very harsh, which gives LiNiO 2 The commercial production of LiNiO has brought considerable difficulties; LiNiO 2 poor thermal stability, under the same conditions as LiCoO 2 and LiMn 2 o 4 Cathode material compared to LiNiO 2 The thermal decomposition temperature of LiNiO is the lowest (about 200 ℃), and the heat release is the most, which brings a great safety hazard to the battery; LiNiO 2 There is ...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/485H01M4/62
CPCY02E60/122H01M4/366H01M4/485H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 吕正中姜倩荣袁中直刘金成
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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