Compounding and coating method of anode material for lithium ion cell

A technology for lithium-ion batteries and positive electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of positive electrode material structure decomposition and cycle performance deterioration, and achieve improved stability, cycle performance and rate discharge performance. The effect of chemical reactions

Inactive Publication Date: 2013-04-03
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high charge cut-off voltage, the cycle performance of ordinary positive electrode materials such as lithium cobalt oxide material deteriorates rapidly, mainly because the positive electrode material has a strong oxidative property under high voltage, which reacts with the electrolyte and causes the positive electrode Due to the decomposition of the material structure

Method used

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  • Compounding and coating method of anode material for lithium ion cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare 570ml of mixed solution of lanthanum nitrate, aluminum nitrate and magnesium nitrate according to the molar ratio of elements La:Al:Mg=1:1:1, La 3+ 、Al 3+ , Mg 2+ The total concentration of 0.5mol / L; the preparation concentration of 1mol / L NH 4 F solution.

[0031] Put 3000g of lithium cobalt oxide cathode material into 5000ml of deionized water, stir with an electric stirrer, and keep the solution temperature at 20°C. During the stirring process, 570ml of the nitrate solution was added dropwise into the lithium cobalt oxide material slurry, and the stirring was continued for 0.5h after the dropwise addition was completed.

[0032] Add NH dropwise 4 F solution. Use a precision pH meter to measure the pH value of the solution, and stop adding NH when the pH value reaches 8-9 4 F solution, continue to stir for 0.5h.

[0033] The slurry was filtered, and the filtrate was dried at 100° C. for 10 h. The dried powder was heat-treated at 600 °C for 10 h in a mu...

Embodiment 2

[0036] Prepare 1100ml of mixed solution of lanthanum nitrate, aluminum nitrate and magnesium nitrate according to the molar ratio of La:Al:Mg=0.5:1:0.5, the total concentration of La, Al and Mg is 1mol / L; the preparation concentration is 2mol / L of NH 4 F solution.

[0037] Put 5000g of lithium cobalt oxide cathode material into 15000ml of deionized water, keep the temperature of the solution at 60°C, and stir with an electric stirrer. During the stirring process, 1100 ml of the nitrate solution was added dropwise into the lithium cobalt oxide material slurry, and the stirring was continued for 0.5 h after the dropwise addition was completed.

[0038] Add NH dropwise 4 F solution. Use a precision pH meter to measure the pH value of the solution, and stop adding NH when the pH value reaches 8-9 4 F solution, continue to stir for 0.5h.

[0039] The slurry was filtered, and the filter was dried at 110° C. for 10 h. The powder obtained after drying was put into a muffle furnac...

Embodiment 3

[0042]Prepare 2400ml of mixed solution of lanthanum nitrate, aluminum nitrate and magnesium nitrate according to the molar ratio of La:Al:Mg=2:1:1, the total concentration of La, Al and Mg is 2.5mol / L; the prepared concentration is 2.5mol / L NH 4 F solution.

[0043] 20kg LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The positive electrode material was put into 40L deionized water, and the temperature of the solution was kept at 30°C, and stirred with an electric stirrer. Add 2400ml of nitrate solution dropwise to LiNi during stirring 1 / 3 co 1 / 3 mn 1 / 3 o 2 In the material slurry, the stirring was continued for 1 h after the dropwise addition was completed.

[0044] Add NH dropwise 4 F solution. Use a precision pH meter to measure the pH value of the solution, and stop adding NH when the pH value reaches 8-9 4 F solution, continue to stir for 1h.

[0045] The slurry was filtered, and the filter was dried at 150° C. for 10 h. The powder obtained after drying was put into a muffle furn...

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Abstract

The invention discloses a compounding and coating method of an anode material for a lithium ion cell. The compounding and coating method comprises the steps that fluorides of La, Al and Mg are coprecipitated on the surface of a lithium ion anode material in a liquid phase; and then, the anode material for the lithium ion cell cooperatively coated by La3+, Al3+, Mg2+ and F- is obtained by heat treatment. With the adoption of the coating treatment, the circulating property and the rate discharge property of the anode material under the charge cut-off voltage are improved; and the high-temperature circulating property of a spinel manganese oxide lithium material and the ordinary pressure circulating property of a nickelic anode material are improved.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion battery, in particular to a composite coating method for the positive electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries are currently the hottest secondary batteries and are widely used in various electronic devices, especially in mobile consumer electronics such as notebook computers, digital cameras and smart phones. As the functions of mobile electronic consumer products become more and more powerful, the power consumption of batteries has increased significantly, and at the same time, the volume is required to be smaller and smaller to improve their portability. Therefore, the energy density of lithium-ion batteries matching them is required to continue to increase. Although lithium-ion batteries have undergone continuous technological development and energy density has continued to increase since their inception, they still canno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48
CPCY02E60/10
Inventor 陈勃涛唐淼程晓坤徐宁
Owner TIANJIN B&M SCI & TECH
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