Preparation method of NCM811-type high-nickel ternary positive electrode material

A cathode material, high nickel technology, applied in the field of nickel-cobalt-manganese ternary cathode material production, can solve the problems of increasing Li+ diffusion kinetic resistance, low tap density, poor high temperature performance, etc., to improve cycle performance and charge-discharge Capacity, suppression of phase transition, low cost effect

Inactive Publication Date: 2018-04-13
淮安新能源材料技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The appearance of the surface reconstruction layer will increase the Li + Diffusion kinetic resistance, leading to capacity drop
High-nickel NCM layer

Method used

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  • Preparation method of NCM811-type high-nickel ternary positive electrode material
  • Preparation method of NCM811-type high-nickel ternary positive electrode material
  • Preparation method of NCM811-type high-nickel ternary positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a. Mixing: using ternary precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 Lithium hydroxide is used as a raw material, and the total molar ratio of lithium and nickel-cobalt-manganese metal is 1.05:1 during batching, mixed and ground, so that lithium, nickel-cobalt-manganese are evenly mixed;

[0027] b. Primary sintering: Sinter the uniformly mixed above-mentioned materials in stages using a tube furnace with pure oxygen. The first stage of sintering is at a temperature of 400 °C for 4 h; the second stage of sintering is at a temperature of 600 °C for 3 h; Three-stage sintering, sintering temperature 750 ℃, sintering 10h, after sintering is completed, lower to room temperature;

[0028] c. Coating: The material obtained by primary sintering is crushed, sieved, and mixed with nano-Al 2 o 3 and AlF 3 As a coating agent, doped with nano-Al 2 o 3 and AlF 3 The usage of the corresponding precursor is 0.2% and 0.8%, respectively, and the mechanical fusion machine with a rotati...

Embodiment 2

[0033] a. Mixing: using ternary precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 Lithium hydroxide is used as a raw material, and the total molar ratio of lithium and nickel-cobalt-manganese metal is 1.01:1 during batching, mixed and ground, so that lithium, nickel-cobalt-manganese are evenly mixed;

[0034] b. Primary sintering: The uniformly mixed raw meal is sintered in stages using a tube furnace with pure oxygen. The first stage is sintered at 500°C for 6 hours; the second stage is sintered at 700°C for 4 hours; the third stage is sintered Stage sintering, the sintering temperature is 870 ° C for 15 h; after the sintering is completed, the temperature is lowered to room temperature 25 ° C, and finally the lithium-ion battery cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 ;

[0035] c. Coating: The material obtained by primary sintering is crushed, sieved, and mixed with nano-Al 2 o 3 and LiF as a coating agent, doped with nano-Al 2 o 3 The amount of the precursor correspondi...

Embodiment 3

[0040] a. Mixing: using ternary precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 And Lithium Retard as raw material, lithium and nickel-cobalt-manganese metal total molar ratio 1.09:1 during batching, mixing and grinding, lithium, nickel-cobalt-manganese are evenly mixed;

[0041] b. Primary sintering: The uniformly mixed raw meal was sintered in stages using a tube furnace with pure oxygen. The first stage of sintering was held at 500 °C for 6 h; the second stage of sintering was held at 700 °C for 4 h; Three-stage sintering, the sintering temperature is 800 ° C for 15 h; after the sintering is completed, the temperature is lowered to room temperature 25 ° C, and finally the lithium-ion battery cathode material LiNi is obtained. 0.8 co 0.1 mn 0.1 o 2 ;

[0042] c. Coating: The material obtained by primary sintering is crushed, sieved, and mixed with nano-Al 2 o 3 and LiF as a coating agent, doped with nano-Al 2 o 3 The amount of the precursor corresponding to LiF is 0.3% and ...

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Abstract

The invention discloses a solid-phase preparation method of an NCM811-type high-nickel ternary positive electrode material. The preparation method comprises the process steps of raw material mixing, primary sintering performed in three segments, composite coating agent coating, secondary sintering and processing after sintering. According to relevant performance test, the composite coating methodof doping nanometer Al2O3 and AlF3 or Al2O3 and LiF into a lithium ion battery positive electrode is employed, primary sintering is performed in three segments, sintering and oxygen introduction are performed, the capacity attenuation of the material can be effectively reduced under the condition that favorable reversible capacity of the material is maintained, the cycle lifetime is prolonged, andthe comprehensive performance of the lithium ion battery positive electrode material is improved.

Description

technical field [0001] The invention belongs to the field of production of nickel-cobalt-manganese ternary positive electrode materials, and in particular relates to a preparation method of an NCM811 type nickel-cobalt-manganese ternary positive electrode material. Background technique [0002] High nickel ternary lithium ion battery cathode material LiNi 1−x−y co x mn y o 2 (NCM) has become a research hotspot due to its advantages of high specific capacity, low cost and excellent safety, and is considered to be a very promising cathode material for lithium-ion power batteries. However, due to the high industrial technical barriers in the research and development of high-nickel ternary materials, domestic high-nickel ternary materials still cannot meet the needs of industrialization of high-nickel ternary batteries. At present, the safety and stability of domestic high-nickel ternary cathode materials need to be improved, so the large-scale industrial application of high...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/48H01M4/505H01M4/525H01M4/582H01M10/0525Y02E60/10
Inventor 周翔顾冬生刘耀春刘清泉卢鹏陈天辰
Owner 淮安新能源材料技术研究院
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