Method for preparing high-nickel NCA ternary lithium battery material by continuous coating

A nickel-cobalt lithium aluminate and ternary lithium battery technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as uneven coating, difficulty in controlling the coating thickness, and weak connection between the film and the active material. Achieve the effects of firm connection, solving the difficulty of controlling the coating process, and suppressing side reactions

Inactive Publication Date: 2018-08-21
CHENDU NEW KELI CHEM SCI CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] Aiming at the defects that the coating modification of the existing high-nickel-nickel-cobalt-aluminum ternary material is difficult to control the coating thickness, the coating is uneven, and the connection between the film and the active material is not firm, the present invention proposes a continuous coating to prepare nickel-cobalt-aluminate lithium The method of high nickel ternary lithium battery material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The nickel-cobalt lithium aluminate high-nickel ternary material was prepared by the following continuous coating modification method:

[0036] a. Preparation of precursor: Dissolve nickel sulfate, cobalt sulfate and aluminum sulfate in water respectively, and then mix the solutions to obtain a mixed aqueous solution containing nickel ions, cobalt ions and aluminum ions, wherein, in molar ratio, Ni: Co:Al=8:1:0.1, and the sum of nickel ion, cobalt ion and aluminum ion concentration is 0.5mol / L. Then add sodium hydroxide solution in the mixed aqueous solution of nickel ion, cobalt ion and aluminum ion as precipitation agent, the concentration of sodium hydroxide solution is 3mol / L, the volume ratio of control mixed aqueous solution and sodium hydroxide solution is 1:0.5, Then use ammonia water to adjust the pH value to 9, coprecipitate for 2 hours, filter and wash to obtain a high-nickel ternary precursor.

[0037] b. Two-stage screw extrusion: mix lithium sulfate and h...

Embodiment 2

[0040] The nickel-cobalt lithium aluminate high-nickel ternary material was prepared by the following continuous coating modification method:

[0041] a. Preparation of precursor: Dissolve nickel sulfate, cobalt sulfate and aluminum sulfate in water respectively, and then mix the solutions to obtain a mixed aqueous solution containing nickel ions, cobalt ions and aluminum ions, wherein, in molar ratio, Ni: Co:Al=8:2:1, and the sum of nickel ion, cobalt ion and aluminum ion concentration is 2mol / L. Then add sodium hydroxide solution in the mixed aqueous solution of nickel ion, cobalt ion and aluminum ion as precipitation agent, the concentration of sodium hydroxide solution is 5mol / L, the volume ratio of control mixed aqueous solution and sodium hydroxide solution is 1:2, Then adjust the pH value to 10 with ammonia water, co-precipitate for 8 hours, filter and wash to obtain a high-nickel ternary precursor.

[0042] b. Two-stage screw extrusion: mix lithium sulfate and high-ni...

Embodiment 3

[0045] The nickel-cobalt lithium aluminate high-nickel ternary material was prepared by the following continuous coating modification method:

[0046] a. Preparation of precursor: Dissolve nickel sulfate, cobalt sulfate and aluminum sulfate in water respectively, and then mix the solutions to obtain a mixed aqueous solution containing nickel ions, cobalt ions and aluminum ions, wherein, in molar ratio, Ni: Co:Al=8:1.5:0.5, and the sum of nickel ion, cobalt ion and aluminum ion concentration is 0.8mol / L. Then add sodium hydroxide solution in the mixed aqueous solution of nickel ion, cobalt ion and aluminum ion as precipitation agent, the concentration of sodium hydroxide solution is 4.5mol / L, the volume ratio of control mixed aqueous solution and sodium hydroxide solution is 1:0.8 , and then adjust the pH value to 10 with ammonia water, co-precipitate for 5 hours, filter and wash to obtain a high-nickel ternary precursor.

[0047] b. Two-stage screw extrusion: mix lithium sulf...

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Abstract

The invention relates to a method for preparing a high-nickel NCA ternary lithium battery material by continuous coating, and belongs to the technical field of lithium ion batteries. According to themethod, coating is performed by a double-stage screw extruder, and aluminum oxide continuously coated and dispersed high-nickel ternary precursor particles are obtained. Coating is uniform and is performed in the continuous high shear process, coating with controllable thickness is realized through measurement of aluminum isopropoxide and rotation speed of a screw, and the defect that the currentcoating process is difficult to control is overcome. The high-nickel NCA material is prepared in a continuous, stable and controllable manner. The method is continuously controllable, an aluminum oxide film with uniform surface distribution is firmly connected with an active material, and side reactions with an electrolyte are effectively suppressed, so that a battery prepared from the ternary material prepared with the method has high first reversible specific capacity and good cycle performance.

Description

technical field [0001] The invention relates to a method for continuously coating nickel-cobalt-lithium-aluminate high-nickel ternary lithium battery materials, belonging to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion battery is a secondary battery (i.e. rechargeable battery), which mainly relies on lithium ions (Li + ) to work by moving between positive and negative poles. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] Compared with traditional storage batteries, lithium-ion batteries not only have higher energy, but also have stronger discharge capacity and longer cycle life. Therefore, the application of lithium-ion batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/525
CPCH01M4/48H01M4/525Y02E60/10
Inventor 陈庆曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD
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