Positive pole material of lithium ion cell

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of declining electrochemical properties of ternary materials, restricting the application of lithium ion batteries, and increasing production costs. The effect of reducing the cost of three wastes treatment and reducing the cost of raw materials

Inactive Publication Date: 2007-01-24
何平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium-ion battery is a new type of power source, it has many advantages such as high voltage, large capacity, safety and environmental protection, so it is being widely accepted by people, but lithium cobalt oxide is the most commonly used cathode material of current lithium-ion batteries. The cost of raw materials is high, and the safety is poor, which restricts the application of lithium-ion batteries. There are also lithium compounds of binary or ternary metals such as lithium manganate, but the synthesis method is complicated, and the reaction process requires a protective gas. Complexation precipitation is used. The method is that the salt solution of nickel, cobalt and manganese is complexed with ammonia and then precipitated with sodium hydroxide. This method is difficult to obtain a fixed ratio of materials due to the different complexation constants of the three, and if the salt solution of nickel, cobalt and manganese is precipitated After forming hydroxide, it is easy to oxidize into trivalent materials, and the electrochemical properties of the ternary materials synthesized by trivalent materials after calcination will be greatly reduced
Therefore, the methods used in the literature all require inert gas protection, which greatly increases the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare 2 liters of 0.5M nickel, cobalt and manganese aqueous solutions with 80.90g of industrial-grade cobalt chloride, 75.80g of manganese sulfate, and 95.43g of nickel sulfate with ion-free water, and prepare 5 liters of 0.5M aqueous solutions with industrial-grade sodium carbonate First add 1 liter of ion-free water into the reactor and stir to heat to 30°C, then add 2 liters of aqueous solution of nickel, cobalt and manganese at a flow rate of 2ml / min, and use sodium carbonate to prepare a 0.5M aqueous solution to adjust the pH value of the reaction system At 7.5±0.1, stir for another 0.5 hours to form a nickel-cobalt-manganese carbonate precipitate; then centrifuge to separate 156.07g of nickel-cobalt-manganese carbonate precipitate, wash with 156.07ml deionized water for 3 times until the pH value of the lotion is 3 .

Embodiment 2

[0029] Prepare 2 liters of 1.2M nickel, cobalt and manganese aqueous solutions with 224.74g of industrial-grade cobalt sulfate, 178.35g of manganese sulfate, and 224.55g of nickel sulfate with ion-free water, and prepare 6 liters of 1.2M aqueous solutions with industrial-grade potassium bicarbonate First add 1 liter of ion-free water into the reactor and stir to heat to 55°C, then add 2 liters of aqueous solution of nickel, cobalt and manganese at a flow rate of 5ml / min, and use sodium carbonate to prepare a 1.2M aqueous solution to adjust the pH value of the reaction system At 8.0 ± 0.1, stir for another 1.0 hour to generate a nickel-cobalt-manganese carbonate precipitate; then centrifuge 365.0 g of the nickel-cobalt-manganese carbonate precipitate, wash twice with 1095ml deionized water until the pH value of the washing solution is 3 .

Embodiment 3

[0031]With ion-free water, 389.85g of cobalt nitrate, 298.74g of manganese sulfate, and 376.12g of nickel sulfate were used to prepare 2 liters of 2.0M nickel, cobalt and manganese aqueous solutions, and 9 liters of 2.0M aqueous solutions were prepared with industrial-grade ammonium bicarbonate First add 1 liter of ion-free water into the reactor and stir to heat to 90°C, then add 2 liters of aqueous solution of nickel, cobalt and manganese at a flow rate of 3.5ml / min, and use ammonium bicarbonate to prepare a 2.0M aqueous solution to adjust the reaction system. The pH value is at 8.5±0.1, and then stirred for 1.0 hour to form a nickel-cobalt-manganese carbonate precipitate; then centrifuge to separate 605.20 g of the nickel-cobalt-manganese carbonate precipitate, wash with 3026ml deionized water once, until the pH value of the lotion is 3 .

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Abstract

This invention relates to a positive material of Li ionic batteries characterizing that it is a ball shape high tap density and high purity oxidized Ni Mn Co and Li in the molecular formula of Li(NiCoMn)1/3O2, the purity of 99.9-99.95% and a ball-shape secondary crystal composed of small grains, the mean diameter is 5-25mum, the tap density is greater than or equal to 2.5g/cu cm.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, in particular to a positive electrode material of a spherical lithium ion battery with high tap density and high purity nickel-manganese-cobalt-lithium oxide, which belongs to a chemical product. [0002] The invention also relates to a preparation method of the spherical high tap density nickel-manganese-cobalt-lithium oxide of the positive electrode material. Background technique [0003] Lithium-ion battery is a new type of power source, it has many advantages such as high voltage, large capacity, safety and environmental protection, so it is being widely accepted by people, but lithium cobalt oxide is the most commonly used cathode material of current lithium-ion batteries. The cost of raw materials is high, and the safety is poor, which restricts the application of lithium-ion batteries. There are also lithium compounds of binary or ternary metals such as lithium mang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01D15/00C01G1/02C01G45/00C01G51/00C01G53/00H01M4/505H01M4/525
CPCY02E60/10
Inventor 王浩然何平袁春怀徐锋赵东明
Owner 何平
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