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Preparation method of lithium ion batteries cathode material solid solution with core-shell structure

A positive electrode material and core-shell structure technology, which is applied in the field of preparation of solid solution of positive electrode material for core-shell structure lithium ion batteries, can solve the problems of limited application, poor rate performance, poor conductivity, etc., achieve high rate performance, and improve volume specific energy. , the effect of high energy density

Inactive Publication Date: 2015-06-17
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the insulating phase Li 2 MnO 3 The existence of the material has poor conductivity, which leads to poor rate performance, which limits its application in electric vehicles

Method used

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  • Preparation method of lithium ion batteries cathode material solid solution with core-shell structure
  • Preparation method of lithium ion batteries cathode material solid solution with core-shell structure
  • Preparation method of lithium ion batteries cathode material solid solution with core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Solid solution Li 1.2 [(Mn 1 / 3 Ni 1 / 3 co 1 / 3 ) 0.5 (Ni 1 / 4 mn 3 / 4 ) 0.5 ] 0.8 o 2 The preparation process

[0017] (1) Weigh the required MnSO according to the stoichiometric ratio of 1:1:1 4 、NiSO 4 Salt and CoSO 4 Dissolve the salt in deionized water to prepare a 300ml solution with a concentration of 1.5mol / L.

[0018] (2) Prepare 300ml of sodium carbonate solution with the same concentration as the above-mentioned total metal ions, add ammonia water as complexing agent, and the concentration of ammonia water is 0.2 mol / L.

[0019] (3) Use a peristaltic pump to continuously input the metal salt solution and sodium carbonate solution into the reaction flask, control the flow rate to 5ml / min, the temperature of the water bath in the reactor is in the range of 55 °C, control the pH of the slurry to 8, and control the stirring speed at 600 rpm .

[0020] (4) After stirring for 3 hours, the NiSO 4 with MnSO 4 According to the molar ratio of stoichiometric ...

Embodiment 2

[0026] Solid solution Li 1.1 [(Mn 1 / 3 Ni 1 / 3co 1 / 3 ) 0.5 (Ni 1 / 4 mn 3 / 4 ) 0.5 ] 0.9 o 2 The preparation process

[0027] (1)-(7) Same as Example 3

[0028] (8) Mix the precursor with Li at a molar ratio of 1.1:0.45 2 CO 3 Mix the powder evenly and roast in the air atmosphere. Pre-calcined at 400–600 °C for 5 h, and then roasted at 800–1000 °C for 10 h with a heating rate of 5 °C / min.

[0029]

Embodiment 3

[0031] Solid solution Li 1.2 [(Mn 1 / 3 Ni 1 / 3 co 1 / 3 ) 0.7 (Ni 1 / 4 mn 3 / 4 ) 0.3 ] 0.8 o 2 The preparation process

[0032] (1) Weigh the required Mn(NO 3 ) 2 , Ni(NO 3 ) 2 Salt and Co(NO 3 ) 2 The salt was dissolved in deionized water to prepare 400ml of a solution with a concentration of 1.4mol / L.

[0033] (2) Prepare 400ml of sodium carbonate solution with the same concentration as the above-mentioned total metal ions, add ammonia water as complexing agent, and the concentration of ammonia water is 0.2 mol / L.

[0034] (3) Use a peristaltic pump to continuously input the metal salt solution and sodium carbonate solution into the reaction flask, control the flow rate to 5ml / min, the temperature of the water bath in the reactor is in the range of 55 °C, control the pH of the slurry to 8, and control the stirring speed at 600 rpm .

[0035] (4) After stirring for 3 hours, the Ni(NO 3 ) 2 with Mn(NO 3 ) 2 According to the molar ratio of stoichiometric ratio 1:...

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Abstract

The invention relates to a preparation method of a lithium ion batteries cathode material solid solution with a core-shell structure. The solid solution is prepared by a two-step coprecipitation method, a molecular formula of the core-shell structure is Li1+y[(Mn1 / 3Ni1 / 3Co1 / 3)x(Ni1 / 4Mn3 / 4)1-x]1-yO2. The method comprises the following steps: spherical [Mn1 / 3Ni1 / 3Co1 / 3]CO3 is synthesized in a stirring reactor through the coprecipitation method, then nickel salt and manganese salt are placed in a reactor according to mol ratio of 1: 3, then a [Mn1 / 3Ni1 / 3Co1 / 3]CO3 precursor with the core-shell structure is obtained through a secondary coprecipitation method, and the precursor and the lithium salt are mixed for calcination to obtain the lithium ion batteries cathode material solid solution with the core-shell structure. The obtained product has excellent electrochemistry property, the preparation method is simple, and is suitable for large scale industrial production.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a method for preparing a solid solution of a positive electrode material of a core-shell structure lithium ion battery. Background technique [0002] With the advancement of science and technology, the requirements for energy storage devices in the fields of electronic products, electric vehicles, medical equipment, and aerospace are increasing. Lithium-ion batteries with high energy density, small size, and long cycle life are widely used. Among them, the traditional cathode material LiCoO 2 Low capacity and high cost; while LiNiO 2 Harsh synthesis conditions, poor reversibility; relatively cheap LiFePO 4 The ionic conductivity is poor, and the actual discharge specific capacity is only 160 mAh / g. These cathode materials for lithium-ion batteries are difficult to meet the requirements of high-capacity, high-energy-density electronic products. [0003] need. ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/10
Inventor 孙琦李岩刘燕杰
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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