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Composite coated Ni65 type nickel-cobalt-manganese ternary positive electrode material as well as preparation method and application thereof

A cathode material and composite material technology, applied in the field of lithium ion battery cathode materials, can solve the problems of increasing the resistivity of material powder, affecting the cycle of high-nickel cathode material, the electrochemical performance of charge and discharge capacity, and reducing the material and electrolyte, etc. Achieve the effect of improving bulk conductivity, improving cycle stability, and increasing diffusion rate

Active Publication Date: 2020-03-27
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, it should be pointed out that the uniform coating on the surface of the positive electrode material can minimize the reaction between the material and the electrolyte, but at the same time it will inhibit the Li + The migration and diffusion of the material, thereby increasing the powder resistivity of the material, and the size of the powder resistivity directly affects the electrochemical performance of the high-nickel cathode material such as cycle, charge and discharge capacity, etc.

Method used

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  • Composite coated Ni65 type nickel-cobalt-manganese ternary positive electrode material as well as preparation method and application thereof
  • Composite coated Ni65 type nickel-cobalt-manganese ternary positive electrode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A Ni65-type nickel-cobalt-manganese ternary positive electrode material coated with aluminum phosphate molecular sieve and phosphate fast ion conductor and a preparation method thereof, comprising the following steps:

[0034] 1) Dissolve boehmite, phosphoric acid, and hydrofluoric acid in deionized water, stir at room temperature for 2 hours, and then add diisopropylamine (IPA) dropwise. 2 o 3 In terms of phosphoric acid in P 2 o 5 Meter, so that the molar ratio of each substance in the above-mentioned crystallization liquid is: n(Al 2 o 3 ):n(P 2 o 5 ):n(IPA):n(HF):n(H 2 (0)=0.4:1:1.25:1:100; and continue to stir for 0.5h; then transfer the above mixed solution to a polytetrafluoroethylene-lined hydrothermal reaction kettle, and perform a hydrothermal reaction at 180°C for 48h to prepare AlPO 4 -11 molecular sieve; the product of hydrothermal reaction is washed with deionized water for 3 times and then dried to obtain AlPO 4 -11 molecular sieve;

[0035] 2) S...

Embodiment 2

[0042] A Ni65-type nickel-cobalt-manganese ternary positive electrode material coated with aluminum phosphate molecular sieve and phosphate fast ion conductor and a preparation method thereof, comprising the following steps:

[0043] 1) Dissolve boehmite, phosphoric acid, and isopropylamine in deionized water. Among them, boehmite is Al 2 o 3 In terms of phosphoric acid in P 2 o 5 Meter, so that the molar ratio of each substance in the above-mentioned crystallization liquid is: n(Al 2 o 3 ):n(P 2 o 5 ):n(IAP):n(H 2 (0)=1:1:0.9:100; Stir at room temperature for 2h; Then transfer the above mixed solution to a polytetrafluoroethylene-lined hydrothermal reaction kettle, and perform a hydrothermal reaction at 200°C for 36h to prepare aluminum phosphate AlPO 4 -14 molecular sieve; the product of the hydrothermal reaction is washed 3 times with deionized water and then dried to obtain AlPO 4 -14 molecular sieves;

[0044] 2) Preparation of fast ion conductor LiAl by solid-s...

Embodiment 3

[0051] A Ni65-type nickel-cobalt-manganese ternary positive electrode material coated with aluminum phosphate molecular sieve and phosphate fast ion conductor and a preparation method thereof, comprising the following steps:

[0052] 1) Dissolve aluminum isopropoxide, phosphoric acid, ethylene glycol (EG), and ethylenediamine (EDA) in deionized water. Among them, boehmite is Al 2 o 3 In terms of phosphoric acid in P 2 o 5 Meter, so that the molar ratio of each substance in the above-mentioned crystallization liquid is: n(Al 2 o 3 ):n(P 2 o 5 ):n(EG)n(EDA):n(H 2 (0)=1:1.8:1:0.9:100, stirred at room temperature for 2h; after that, the above mixed solution was transferred to a polytetrafluoroethylene-lined hydrothermal reactor, irradiated for 30h under the action of 2.45GHz microwave, and AlPO was prepared 4 -31 molecular sieves; the resulting product is washed with deionized water for 3 times and then dried to obtain AlPO 4 -31 molecular sieve;

[0053] 2) Synthesis of L...

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Abstract

The invention discloses a composite coated Ni65 type nickel-cobalt-manganese ternary positive electrode material as well as a preparation method and application thereof. The method comprises the following steps: (1) uniformly mixing a Ni65 type nickel-cobalt-manganese ternary positive electrode material, an aluminum phosphate molecular sieve and a phosphate fast ion conductor according to a mass ratio of 100: (0.05-2): (0.05-3) to obtain a composite material; and (2) calcining the composite material at 300-900 DEG C for 4-12 hours. According to the method, AlPO<4> can be used for effectively inhibiting dissolution of transition metal Co / Mn in the circulation process of the positive electrode material, so that the structural stability of the positive electrode material is improved; a pore structure in the aluminum phosphate molecular sieve can provide a special channel for diffusion and migration of Li<+> and accelerate the de-intercalation process of Li<+>, so that the electrochemicalperformance of the material is improved. And the fast ion conductor can increase the bulk phase conductivity and grain boundary conductivity of the material, so that the rate capability of the positive electrode material is improved.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a compound-coated Ni65-type nickel-cobalt-manganese ternary positive electrode material and its preparation method and application, in particular to a composite coating of an aluminum phosphate molecular sieve and a phosphate fast ion conductor Ni65 type nickel-cobalt-manganese ternary positive electrode material and its preparation method and application. Background technique [0002] In rechargeable lithium-ion batteries, commercialized cathode materials such as lithium cobaltate LiCoO 2 , NCM523, etc. Theoretical specific capacity can reach 274mAh / g, 280mAh / g, but the Li released from the lattice of the material during the charging process + Excessive amounts will lead to the collapse of the crystal structure, resulting in a sharp attenuation of the electrochemical performance of the cathode material and irreversible ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 汪乾刘婧婧唐盛贺阮丁山李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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