Ternary positive electrode material micron-sized platy monocrystal structure aggregate and preparation method thereof

A sheet-like single crystal, cathode material technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of single crystal materials with good high voltage resistance, poor capacity and rate performance, and battery capacity attenuation, etc. Cyclic stability, shortening of processing time, effect of lowering melting point

Pending Publication Date: 2019-02-19
圣戈莱(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The morphology of aggregates is secondary micron spherical particles composed of nanometer or submicron primary particles. The fine primary particles make the contact area between the active material and the electrolyte larger, which makes the material have a higher capacity and a better rate performance; but the material The interface structure is easily corroded and damaged by the electrolyte, which leads to the dissolution of transition metals Ni, Co, and Mn in the electrolyte, resulting in the attenuation of battery capacity
Single crystal materials have good high voltage resistance, the particles are not easy to break during the cycle, and the cycle stability is better; but their capacity and rate performance are not as good as aggregates

Method used

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  • Ternary positive electrode material micron-sized platy monocrystal structure aggregate and preparation method thereof
  • Ternary positive electrode material micron-sized platy monocrystal structure aggregate and preparation method thereof
  • Ternary positive electrode material micron-sized platy monocrystal structure aggregate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The micron-scale flake single crystal structure aggregate of the ternary positive electrode material prepared in this example has a main chemical formula of LiNi 0.6 co 0.2 mn 0.2 o 2 , also contains a small amount of doping element zirconium; the specific preparation method is as follows:

[0030] (1) Preparation of precursors: ① Weigh 2.4 mol of nickel sulfate, 0.8 mol of manganese sulfate, and 0.8 mol of cobalt sulfate, dissolve them in pure water, and prepare a 2-liter solution to obtain 2.0 mol / L of metal Salt solution A; ②Weigh 8.4mol of sodium hydroxide, dissolve it in pure water, and prepare 2 liters of aqueous solution to obtain a precipitant solution B with a concentration of 4.2mol / L; ③Use ammonia water as a complexing agent, take an appropriate amount thick ammonia water, add appropriate amount of pure water, and prepare 2 liters of 8mol / L ammonia solution C; Co-precipitation reaction; reaction parameters: stirring speed 400rpm, reaction system temperatu...

Embodiment 2

[0041] The micron-scale flake single crystal structure aggregate of the ternary positive electrode material prepared in this example has a main chemical formula of LiNi 0.5 co 0.2 mn 0.3 o 2 , also contains a small amount of doping element boron; the specific preparation method is as follows:

[0042] (1) Preparation of precursor: ① Weigh 2 mol of nickel sulfate, 0.8 mol of manganese sulfate, and 1.2 mol of cobalt sulfate, dissolve them in pure water, and prepare a 2-liter solution to obtain a 2.0 mol / L metal salt Solution A; 2. Weigh 8.4mol of sodium hydroxide, dissolve it in pure water, and prepare 2 liters of aqueous solution to obtain a concentration of 4.2mol / L precipitant solution B; 3. use ammonia as a complexing agent, take an appropriate amount of Concentrated ammonia water, add an appropriate amount of pure water, and prepare 2 liters of 8mol / L ammonia solution C; ④Pump the above metal salt solution A, precipitant solution B and ammonia solution C into the chemica...

Embodiment 3

[0048] The micron-scale flake single crystal structure aggregate of the ternary positive electrode material prepared in this example has a main chemical formula of LiNi 0.6 co 0.2 mn 0.2 o 2 , also contains a small amount of doping elements zirconium and aluminum, the specific preparation method is as follows:

[0049] (1) Preparation of precursors: Weigh 2.4mol of nickel sulfate, 0.8mol of manganese sulfate, and 0.8mol of cobalt sulfate, dissolve them in pure water, and prepare a 2-liter solution to obtain a 2mol / L metal salt solution A; 2. Weigh 8.4mol of sodium hydroxide, dissolve it in pure water, and prepare 2 liters of aqueous solution to obtain a concentration of 4.2mol / L precipitant solution B; 3. utilize ammonia water as a complexing agent, take an appropriate amount of concentrated Ammonia water, add an appropriate amount of pure water to prepare 2 liters of 6mol / L ammonia solution C; ④Pump the above metal salt solution A, precipitant solution B and ammonia soluti...

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Abstract

The invention discloses a preparation method of a ternary positive electrode material micron-sized platy monocrystal structure aggregate. The method comprises the steps that an improved chemical coprecipitation method is adopted for preparing a micron spherical precursor formed by closely stacking nanometer sheets, wherein the size of the precursor D50 ranges from 6 micrometers to 8 micrometers; then the precursor is fully mixed with an appropriate amount of fluxing agent and lithium salt in sequence; finally, two-step high temperature sintering is conducted in a high temperature sintering furnace, and a ternary positive electrode material of the micron-sized platy monocrystal structure aggregate is obtained finally. The prepared positive electrode material combines the advantages of a monocrystal structure and an aggregate structure, on the one hand, a micron-sized platy monocrystal can make the positive electrode material tolerate high voltage and have better cycling stability and the high capacity and rate performance; one the other hand, the spherical structure ensures that the material has the high compaction density and excellent battery processing performance; therefore, theternary positive electrode material with the excellent performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and relates to a micron-scale flake single crystal structure aggregate of a ternary positive electrode material and a preparation method thereof. Background technique [0002] Ternary cathode material is a new type of cathode material for lithium-ion batteries that has been successfully developed in recent years and has rapidly entered commercialization. It better combines the advantages of lithium cobaltate, lithium nickelate, and lithium manganate. The ternary synergistic effect makes its comprehensive performance better than any single-component compound, making it have high specific capacity, stable cycle performance, and relatively low cost. It is an ideal cathode material for power lithium-ion batteries, and is also considered to be the best and can replace LiCoO 2 positive electrode material. [0003] As we all know, the morphology of lithium-ion battery c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/60
CPCH01M4/364H01M4/602Y02E60/10
Inventor 闫东伟赵宜男吴志坚谷丰宏冯一涛
Owner 圣戈莱(北京)科技有限公司
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