Preparation method of nano-ternary complex lithium-ion battery cathode material

A lithium-ion battery and ternary composite technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of affecting material performance, non-concentrated particle size distribution, long reaction time and energy consumption, and achieve the goal of improving consistency performance Effect

Inactive Publication Date: 2011-01-12
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current process route for synthesizing the ternary system is to use a high-temperature solid-phase method, which is refined and mixed by mechanical means and then sintered at a high temperature to obtain this type of positive electrode material. The high-temperature solid-phase method is the most widely used in the field of material preparation because of its simple equipment and process, and is easy to industrialize. Widely used, but the high-temperature solid-phase method of mechanical mixing has the following disadv

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  • Preparation method of nano-ternary complex lithium-ion battery cathode material

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Experimental program
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Effect test

Embodiment 1

[0019] Lithium nitrate, nickel nitrate, cobalt nitrate, and manganese nitrate were dissolved in deionized water to form a homogeneous solution, wherein the molar ratio of Li:Ni:Co:Mn was 1:0.2:0.5:0.3, and all the metals were added after mixing the above solutions. Citric acid with 3 times the amount of ionic substances is used as a metal ion chelating agent and fully stirred, and the mixed solution is moved into a water bath and heated at a constant temperature of 95°C until a sol is formed, and the obtained sol is vacuum-dried at 120°C. Sinter at 850°C for 10 hours to obtain α-NaFeO with primary particle size below 100nm 2 Type LiNi 0.2 co 0.5 mn 0.3 o 2 Cathode material.

[0020] see figure 1 It is shown that the sample prepared by this process method has the characteristics of concentrated particle size distribution and primary particle size less than 100nm. This process method effectively avoids the ball milling treatment process adopted by the high-temperature soli...

Embodiment 2

[0022] Lithium nitrate, nickel acetate, cobalt oxalate, and manganese nitrate were dissolved in deionized water to form a homogeneous solution, wherein the molar ratio of Li:Ni:Co:Mn was 1:0.2:0.6:0.2, and all the metals were added after mixing the above solutions. Citric acid with 5 times the amount of ionic substances is used as a metal ion chelating agent and fully stirred. The mixed solution is moved into a water bath and heated at a constant temperature of 85°C until a sol is formed. The resulting sol is vacuum-dried at 100°C. Sintering at 750°C in air for 22 hours to obtain α-NaFeO with primary particle size below 100nm 2 Type LiNi 0.2 co 0.6 mn 0.2 o 2 Cathode material.

Embodiment 3

[0024] Dissolve lithium nitrate, nickel sulfate, cobalt oxalate, and manganese nitrate in deionized water to form a homogeneous solution, in which the molar ratio of Li:Ni:Co:Mn is 1:0.4:0.2:0.4, mix the above solutions and add all the metals Citric acid with 2 times the amount of ionic substances is used as a metal ion chelating agent and fully stirred, and the mixed solution is moved into a water bath and heated at a constant temperature of 90°C until a sol is formed, and the obtained sol is vacuum-dried at 100°C. Sinter at 900°C in air for 8 hours to obtain α-NaFeO with primary particle size below 100nm 2 Type LiNi 0.4 co 0.2 mn 0.4 o 2 Cathode material.

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Abstract

The invention provides a preparation method of a nano-ternary complex lithium-ion battery cathode material, which comprises the following steps: 1) respectively dissolving soluble Li, Ni, Co and Mn compounds into deionized water according to the molar ratio of 1: x: y: z, mixing four kinds of solution, fully stirring and obtaining the uniform mixed solution, wherein x is not less than 0 and not more than 0.5, y is not less than 0.2 and not more than 0.6, z is not less than 0 and not more than 0.5, and x plus y plus z is equal to 1; 2) adding citric acid into the mixed solution as a metal ion chelating agent; and 3) transferring the mixed solution into a water bath pot for heating, carrying out full reaction, forming sol, carrying out vacuum drying on the obtained sol, then carrying out high-temperature sintering in air and obtaining the cathode material with the primary particle diameter of below 100nm and the molecular formula of LiNixCoyMnzO2. Compared with the prior art, the preparation method can prepare the LiNixCoyMnzO2 ternary material with primary particles of below 100nm by adopting the sol-gel method.

Description

technical field [0001] The invention belongs to the field of energy material preparation technology, and relates to a preparation method of a nanometer ternary composite lithium ion battery cathode material. Background technique [0002] The layered ternary material Li-Ni-Co-Mn-O has the advantages of high specific capacity, low cost, stable cycle performance, and good safety, and can effectively make up for LiCoO 2 , LiNiO 2 , LiMnO 2 Due to their respective shortcomings, the development of ternary materials has become a research hotspot in the field of cathode materials. The current process route for synthesizing the ternary system is to use a high-temperature solid-phase method, which is refined and mixed by mechanical means and then sintered at a high temperature to obtain this type of positive electrode material. The high-temperature solid-phase method is the most widely used in the field of material preparation because of its simple equipment and process, and is easy...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/58
CPCY02E60/122Y02E60/10
Inventor 赵金鑫
Owner IRICO
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