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A method for preparing nano-and micro-scale core-shell ternary cathode materials by low temperature self-propagation method

A cathode material, self-propagating technology, applied in electrical components, battery electrodes, electrochemical generators, etc., can solve the problems of high cost of time instruments, three wastes, increased costs, etc., and achieve the effect of shortening the production cycle and reducing the three wastes

Inactive Publication Date: 2019-01-08
SHANDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the co-precipitation method is mainly used to synthesize ternary materials. The operation is controllable and the processing performance is good, but it will bring a lot of three wastes, and the cost of time and equipment is high.
On the other hand, in order to improve the electrochemical performance of NCM, two modification methods are usually used: (1) doping, which enhances the structural stability by introducing impurity atoms; (2) coating, which coats the surface with a thin layer of Metal oxides are used to suppress the occurrence of side reactions, and the cycle performance and thermal stability of the modified NCM materials are improved, but the cost is increased

Method used

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  • A method for preparing nano-and micro-scale core-shell ternary cathode materials by low temperature self-propagation method
  • A method for preparing nano-and micro-scale core-shell ternary cathode materials by low temperature self-propagation method
  • A method for preparing nano-and micro-scale core-shell ternary cathode materials by low temperature self-propagation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this example, 0.9 parts of Li are first prepared 1.2 Ni 0.133 co 0.133 mn 0.534 o 2 Lithium-rich core, then prepare 0.1 part of LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The low-nickel shell, the general structural formula is Li 1.18 Ni 0.153 co 0.153 mn 0.514 o 2 . Prepare 2mol / L LiNO according to the stoichiometric ratio of 9:1:1:4 3 , Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and Mn(NO 3 ) 2 (50% aqueous solution) metal salt mixed solution 45ml, add 0.6mol glycine, stir evenly, add ammonia water dropwise to adjust pH to 9, and obtain solution A. Pour solution A into a crucible, burn it at 600°C, then raise the temperature to 900°C, keep it warm for 4 hours, take it out after cooling in the furnace to obtain powder B, collect and grind B. Configure 0.5mol / L LiNO at a stoichiometric ratio of 3:1:1:1 3、 Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and Mn(NO 3 ) 2 (50% aqueous solution) Metal salt mixed solution 20ml, add 0.2mol glycine, stir evenly, add ...

Embodiment 2

[0032] In this example, prepare 0.7 parts of LiNi first 0.8 co 0.1 mn 0.1 o 2 of high nickel core, and then prepare 0.3 parts of LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The low-nickel shell, the general structural formula is LiNi 0.66 co 0.17 mn 0.17 o 2 .

[0033] Prepare 1mol / L LiNO according to the stoichiometric ratio of 100:80:10:10 3 , Ni(CH 3 COO) 2 4H 2 O, Co(CH 3 COO) 2 4H 2 O and Mn(NO 3 ) 2 (50% aqueous solution) Metal salt mixed solution 35ml, add 0.3mol citric acid, stir evenly, add ammonia water dropwise to adjust pH to 8.5, and obtain solution A. Pour solution A into a crucible, burn it at 500°C, then raise the temperature to 750°C, keep it warm for 2 hours, take it out after cooling in the furnace to obtain powder B, collect and grind B. Configure 0.5mol / L LiNO at a stoichiometric ratio of 3:1:1:1 3、 Ni(CH 3 COO) 2 4H 2 O, Co(CH 3 COO) 2 4H 2 O and Mn(NO 3 ) 2 (50% aqueous solution) Metal salt mixed solution 30ml, add 0.2mol citric acid, stir ev...

Embodiment 3

[0036] In this example, 0.6 parts of LiNi are prepared first 0.7 co 0.15 mn 0.15 o 2 of high nickel core, and then prepare 0.4 parts of LiNi 0.4 co 0.2 mn 0.4 o 2 The low-nickel shell, the general structural formula is LiNi 0.58 co 0.17 mn 0.25 o 2 .

[0037] Prepare 1mol / L LiNO according to the stoichiometric ratio of 100:70:15:15 3、 Ni(CH 3 COO) 2 4H 2 O, Co(CH 3 COO) 2 4H 2 O and Mn(NO 3 ) 2 (50% aqueous solution) metal salt mixed solution 60ml, add 0.5mol urea, stir evenly, add ammonia water dropwise to adjust pH to 8, and obtain solution A. Pour solution A into a crucible, burn it at 500°C, then raise the temperature to 750°C, keep it warm for 2 hours, take it out after cooling in the furnace to obtain powder B, collect and grind B. Configure 1mol / L LiNO at a stoichiometric ratio of 100:40:20:40 3、 Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and Mn(NO 3 ) 2(50% aqueous solution) Metal salt mixed solution 40ml, add 0.4mol urea, stir evenly, add am...

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Abstract

The invention belongs to the technical field of preparation of cathode materials for lithium ion batteries, in particular to a core-shell ternary cathode material mLi [NibCocMnd] O2. NLi1 + e [NifCogMnh] 1 prepared by a low-temperature self-propagation method. EO2 (m+n=1, ne=a, mb+n (1-E) f=x (1-A), mc+n (1-E) g=y (1-A), md+n (1-E) h=z (1-A), 0.1 < = b <= 0. 5, 0.6 <= f <= 0. 9, 0 <= e <= 0. 4).At first, a high-nickel or lithium-rich core is prepare, and then a core-shell structure ternary cathode material is prepared as that core, and finally, the nano-and micro-scale core-shell ternary cathode material is obtain by high-temperature calcination. If the multilayer core-shell structure material is prepared, the shell is prepared repeatedly according to the actual design ratio. With the high stability ternary cathode material of low nickel as the shell, the core of high nickel or lithium-rich system which has many defects but high capacity is coated. Through the design of the structureand batch preparation, the obtained material will play a better role in the high capacity of the core and the stability of the shell. The preparation method is simple, rapid, low energy consumption,and does not need additional doping coating to increase the cost of capacity loss and other problems, so it is a practical and industrialized application method.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium ion batteries, and specifically provides a method for preparing core-shell ternary positive electrode materials by a low-temperature self-propagating method. Background technique [0002] Lithium-ion batteries have been widely used as power sources for portable electronic devices such as mobile phones, laptops, and digital cameras due to their high energy density, light weight, long cycle life, and environmental friendliness. A key factor that determines the energy density of a battery is the specific capacity of the cathode material. Compared with commercial cathode materials lithium cobaltate, lithium manganese oxide, and lithium iron phosphate, the ternary cathode material Li[Ni x co y mn z ]O 2 It is considered as a promising cathode material due to its high reversible capacity and low cost. [0003] In the ternary cathode materials, due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 温广武张俊亭王桢
Owner SHANDONG UNIV OF TECH
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