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Method for preparing lithium-nickel-cobalt-aluminium oxide material by adopting low-heat solid-phase reaction

A lithium-nickel-cobalt-aluminum, low-heat solid-phase technology is applied in the field of preparing lithium-nickel-cobalt-aluminum oxide cathode materials by low-heat solid-phase reaction, which can solve the problems of high energy consumption required, high reaction temperature, difficult to mix uniformly, etc. Production cost, the effect of reducing energy consumption

Active Publication Date: 2014-07-23
山东天骄新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects existing in the prior art, to provide a method for preparing lithium nickel cobalt aluminum oxide material by low heat solid phase reaction, to solve the problems existing in the synthesis of lithium nickel cobalt aluminum oxide material by high temperature solid phase method The reaction temperature is high, the energy consumption is high; the chemical reaction components are difficult to control and the mixing is not easy to be uniform.

Method used

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  • Method for preparing lithium-nickel-cobalt-aluminium oxide material by adopting low-heat solid-phase reaction
  • Method for preparing lithium-nickel-cobalt-aluminium oxide material by adopting low-heat solid-phase reaction
  • Method for preparing lithium-nickel-cobalt-aluminium oxide material by adopting low-heat solid-phase reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) LiOH·H 2 O (12.445g), Ni(NO 3 ) 2 ·6H 2 O (69.790g), Co (NO 3 ) 2 ·6H 2 O (13.096g), Al(NO 3 ) 3 9H 2 O (5.627g) was weighed according to the molar ratio (1.06:0.8:0.15:0.05), and mixed in a high-speed mixer at a speed of 2000 rpm. After mixing for 15 minutes, a green paste precursor was obtained. It was vacuum-dried at 120° C. for 12 h.

[0027] (2) Calcining the prepared precursor in an oxygen or air atmosphere at 700°C for 8 hours to obtain the final product.

Embodiment 2

[0029] (1) LiOH·H 2 O (12.445g), Ni(NO 3 ) 2 ·6H 2 O (69.790g), Co (NO 3 ) 2 ·6H 2 O (13.096g), Al(NO 3 ) 3 9H 2 O (3.939g), MgCl 2 ·6H 2 O (0.919g) was weighed according to the molar ratio (1.06:0.8:0.15:0.035:0.015), and mixed in a high-speed mixer with a speed of 2000 rpm. After mixing for 15 minutes, a green paste precursor was obtained . It was vacuum-dried at 120° C. for 12 h.

[0030] (2) Calcining the prepared precursor in an oxygen or air atmosphere at 700°C for 8 hours to obtain the final product.

Embodiment 3

[0032] (1) LiOH·H 2 O (12.445g), Ni(NO 3 ) 2 ·6H 2 O (69.790g), Co (NO 3 ) 2 ·6H 2 O (13.096g), Al(NO 3 ) 3 9H 2 O (3.939g), H 3 BO 3 (0.278g) weighed by molar ratio (1.06:0.8:0.15:0.035:0.015), mixed in a high-speed mixer with a mixer speed of 2000 rpm, and after mixing for 15 minutes, a green paste precursor was obtained. It was vacuum-dried at 120° C. for 12 h.

[0033] (2) Calcining the prepared precursor in an oxygen or air atmosphere at 700°C for 8 hours to obtain the final product.

[0034] From figure 1 The XRD pattern of the medium precursor shows that when the precursor is prepared by high-speed mixing, most of the crystal water has been removed, and the hydroxyl groups in LiOH are broken off and combined with Ni, Co, etc. to form metal hydroxides, while Li + with NO 3 - combined to form LiNO 3 .

[0035] From figure 2 , image 3 It can be seen that the crystallization of the nickel-cobalt-aluminate lithium sample obtained by the low-temperature ...

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Abstract

The invention discloses a method for preparing a lithium-nickel-cobalt-aluminium oxide material by adopting low-heat solid-phase reaction. The method comprises the following steps: a. preparing a precursor, namely weighing lithium hydroxide monohydrate, nickel nitrate hexahydrate, cobalt nitrate hexahydrate, lithium nitrate nonahydrate and a doping element M according to stoichiometry of LiNi(0.8)Co(0.15)Al(0.05+ / -x)M(y)O(2), wherein x is greater than or equal to 0 and is less than or equal to 0.05, y is greater than or equal to 0 and is less than or equal to 0.05, x+y is equal to 0.05, M is B, Zr, Ti or AlPO4, mixing in a high-speed mixer at the rotating speed of 2000r / m for 15 minutes according to a stoichiometric ratio so as to obtain a synthesized material, and drying the synthesized material at the temperature of 120-150 DEG C in vacuum so as to prepare the precursor; and b. roasting the precursor prepared in the step a at the temperature of 600-800 DEG C in an oxygen atmosphere or an air atmosphere so as to obtain the final product-lithium-nickel-cobalt-aluminium oxide material. The method has the following advantages that the stoichiometric ratio of the components is relatively easy to control, the components are uniformly mixed, the synthesis temperature can also be reduced, and the energy consumption and the production cost are reduced.

Description

technical field [0001] The invention relates to the technical field of preparation methods of lithium battery positive electrode materials, in particular to a method for preparing lithium nickel cobalt aluminum oxide positive electrode materials by low-heat solid-state reaction. Background technique [0002] Compared with lithium cobalt oxide, a commercial lithium-ion battery cathode material, lithium nickel cobalt aluminate has a higher actual discharge specific capacity and better storage and cycle performance. Changes in surface crystal / electronic structure and cation mixing of NCA cathode materials during long-term high-temperature storage compared to LiCoO 2 The cathode material is much smaller, indicating that NCA has excellent storage properties [ref. Shoichiro Watanabe, Journal of Power Sources247(2014) 412-422]. [0003] At present, the production of nickel cobalt lithium aluminate (NCA) mostly adopts the co-precipitation method to prepare the precursor. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/485
CPCH01M4/362H01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 仇卫华段小刚王伟东
Owner 山东天骄新能源有限公司
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