Preparation method of positive electrode material for lithium-ion battery

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, batteries, secondary batteries, etc., can solve the problems of lithium carbonate residue, reduce gram capacity, reduce NCM ion conductance and electron conductance, etc., to prevent agglomeration growth, improve Operability and the effect of improving ion conductivity

Inactive Publication Date: 2017-05-10
OPTIMUM BATTERY CO LTD
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Problems solved by technology

Washing with water can remove part of the alkaline substances on the surface, but due to the low solubility of lithium carbonate, some lithium carbonate with poor conductivity still remains; coatings such as aluminum oxide and zinc oxide are electrochemically inert coatings, which will not only reduce the ion density of NCM conductance and electronic conductance, also reduces actual gram capacity

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  • Preparation method of positive electrode material for lithium-ion battery
  • Preparation method of positive electrode material for lithium-ion battery
  • Preparation method of positive electrode material for lithium-ion battery

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Embodiment Construction

[0027] Please refer to figure 1 , the invention provides a kind of preparation method of lithium-ion battery cathode material, comprises the following steps:

[0028] 1) configuring an oxalic acid solution with a molar concentration of 0.3-0.9mol / L, adding a certain amount of phosphoric acid to obtain a mixed acid solution, the molar ratio of the oxalic acid to the phosphoric acid in the mixed acid solution is 1.5-90;

[0029] 2) Add a certain amount of nickel-cobalt-manganese ternary positive electrode material to the mixed acid solution obtained in step 1), and the quality of the nickel-cobalt-manganese ternary positive electrode material is 5-30 times of the mass of the oxalic acid, at room temperature Stir for 10-60min to form a slurry;

[0030] 3) The slurry obtained in step 2) is spray-dried according to an inlet temperature of 150±50°C, an outlet temperature of 100±50°C, and a spray speed of 500-1000mL / h to obtain a dried powder;

[0031] 4) The powder obtained in ste...

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Abstract

The invention provides a preparation method of a positive electrode material for a lithium-ion battery. The method comprises the following steps of (1) preparing an oxalic acid solution of which the molar concentration is 0.3-0.9mol/L, and adding a certain amount of phosphoric acid to obtain a mixed acid liquid, wherein the molar ratio of an oxalic acid to the phosphoric acid in the mixed acid liquid is 1.5-90; (2) adding a certain amount of Ni-Co-Mn ternary positive electrode material to the mixed acid liquid obtained in the step (1), wherein the mass of the Ni-Co-Mn ternary positive electrode material is 5-30 times of that of the oxalic acid, and stirring at a room temperature to form slurry; (3) carrying out spray drying on the slurry obtained in the step (2) at an inlet speed of 150+/-50 DEG C and the spray speed of 500-1000mL/h to obtain dry powder; and (4) putting the powder obtained in the step (3) in a muffle furnace, roasting the powder at 400-700 DEG C for 3-7 hours, naturally cooling and then carrying out grinding treatment.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a positive electrode material of a lithium ion battery. [0003] 【Background technique】 [0004] Due to the limited energy density of battery packs for electric vehicles, it seriously hinders the further improvement of cruising range. The energy density of the battery partly depends on the positive electrode material. The nickel-cobalt-manganese ternary positive electrode material (NCM) has the advantages of high gram capacity and low price, but it has problems such as high pH, ​​easy water absorption, high activity, poor storage performance, and poor conductivity. It needs to be strengthened. For the above problems of NCM, water washing or surface coating are mainly used. Washing with water can remove part of the alkaline substances on the surface, but due to the low solubility of lithium carbonate, some lithium carbona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M4/628H01M10/0525H01M2220/20Y02E60/10
Inventor 陈鹏刘晓艳
Owner OPTIMUM BATTERY CO LTD
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