A method for preparing lithium nickel cobalt aluminum oxide material by low heat solid state reaction

A lithium-nickel-cobalt-aluminum, low-heat solid-phase technology, which is applied in the field of low-heat solid-phase reaction to prepare lithium-nickel-cobalt-aluminum oxide cathode materials, can solve the problems of high energy consumption, high reaction temperature, and difficult mixing uniformity, etc. Effects of energy consumption and production cost reduction

Active Publication Date: 2017-01-18
山东天骄新能源有限公司
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  • Abstract
  • Description
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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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  • A method for preparing lithium nickel cobalt aluminum oxide material by low heat solid state reaction
  • A method for preparing lithium nickel cobalt aluminum oxide material by low heat solid state reaction
  • A method for preparing lithium nickel cobalt aluminum oxide material by low heat solid state reaction

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Effect test

Embodiment 1

[0027] (1) LiOH·H2O (12.445g), Ni(NO3)2·6H2O (69.790g), Co(NO3)2·6H2O (13.096g), Al(NO3)3·9H2O (5.627g) in molar ratio (1.06:0.8:0.15:0.05) Weighing and mixing in a high-speed mixer, the mixer rotates at 2000 rpm, and after mixing for 15 minutes, a green paste precursor is obtained. It was vacuum dried at 120°C for 12h.

[0028] (2) calcining the prepared precursor in an oxygen atmosphere or an air atmosphere at 700° C. for 8 hours to obtain a final product.

Embodiment 2

[0030] (1) LiOH·H2O(12.445g), Ni(NO3)2·6H2O(69.790g), Co(NO3)2·6H2O(13.096g), Al(NO3)3·9H2O(3.939g), MgCl2· 6H2O (0.919g) was weighed in a molar ratio (1.06:0.8:0.15:0.035:0.015), mixed in a high-speed mixer, the speed of the mixer was 2000 rpm, and after mixing for 15 minutes, a green paste precursor was obtained . It was vacuum dried at 120°C for 12h.

[0031] (2) calcining the prepared precursor in an oxygen atmosphere or an air atmosphere at 700° C. for 8 hours to obtain a final product.

Embodiment 3

[0033] (1) LiOH·H2O(12.445g), Ni(NO3)2·6H2O(69.790g), Co(NO3)2·6H2O(13.096g), Al(NO3)3·9H2O(3.939g), H3BO3( 0.278g) was weighed in a molar ratio (1.06:0.8:0.15:0.035:0.015), mixed in a high-speed mixer at a speed of 2000 rpm, and after mixing for 15 minutes, a green paste precursor was obtained. It was vacuum dried at 120°C for 12h.

[0034] (2) calcining the prepared precursor in an oxygen atmosphere or an air atmosphere at 700° C. for 8 hours to obtain a final product.

[0035] 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 group in LiOH is broken off and combined with Ni, Co, etc. to form metal hydroxide, while Li+ and NO3- Combine to form LiNO3.

[0036] from figure 2 , image 3 It can be seen that the nickel cobalt lithium aluminate sample obtained by the low temperature solid phase method has good crystallization, peak splitting, no i...

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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 positive electrode materials for lithium batteries, in particular to a method for preparing lithium nickel cobalt aluminum oxide positive electrode materials by low-thermal solid-phase reaction. Background technique [0002] Compared with lithium cobalt oxide, a commercial cathode material for lithium-ion batteries, lithium nickel cobalt aluminate has higher actual discharge specific capacity and better storage and cycling performance. Changes in the surface crystal / electronic structure and cation mixing of NCA cathode materials during long-term high temperature storage compared with LiCoO 2 The cathode material is much smaller, indicating that NCA has excellent storage properties [ref. Shoichiro Watanabe, Journal of Power Sources 247 (2014) 412-422]. [0003] At present, the production of nickel cobalt aluminate (NCA) mostly adopts the co-precipitation method to prepare the precur...

Claims

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Application Information

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Patent Type & Authority Patents(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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