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Preparation method of solid solution positive material covering surface of fast ionic conductor

A positive electrode material and surface coating technology, applied in the field of new energy materials, can solve the problems that the rate performance cannot meet the requirements, affect the rate performance of solid solution positive electrode materials, and the low lithium ion conductivity

Active Publication Date: 2014-12-03
湖北江宸新能源科技有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, according to the results reported so far, its rate performance still cannot meet the requirements of lithium-ion batteries for electric vehicles.
Because the above-mentioned coating itself is not a fast ion conductor, the conductivity of lithium ions is low, which affects the improvement of the rate and performance of solid solution positive electrode materials.

Method used

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  • Preparation method of solid solution positive material covering surface of fast ionic conductor

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Embodiment 1

[0011] Embodiment 1: first take by weighing nickel sulfate, cobalt sulfate, manganese sulfate and excessive 20% sodium hydroxide according to stoichiometric ratio, be mixed with concentration and be the mixed solution of 0.1mol / L nickel-cobalt-manganese, nickel, cobalt, manganese in solution The concentration ratio of ions is 1:1:3, and the concentration of sodium hydroxide in the mixed solution is 0.24mol / L. By ultrasonic external field assisted co-precipitation method, the temperature is controlled at 50°C, and the pH value is controlled at 8.0 to prepare the precursor, and then Mixed with lithium carbonate weighed according to the stoichiometric ratio, mechanically activated for 1h, calcined at 400°C for 1h, then calcined at 750°C for 24h, and finally cooled to obtain the layered solid solution positive electrode material Li 1.5 Ni 0.2 co 0.2 mn 0.6 o 2.5 ; Then according to Li 1.2 (Al 0.1 Ti 0.9 ) 2 (PO 4 ) 3 ) stoichiometric ratio to take H 3 PO 4 、TiO 2 、A1 ...

Embodiment 2

[0013] Embodiment 2: first take by weighing nickel sulfate, cobalt sulfate, manganese sulfate and excessive 20% sodium hydroxide according to stoichiometric ratio, be mixed with concentration and be the mixed solution of 1mol / L nickel cobalt manganese, nickel, cobalt, manganese ion in solution The concentration ratio of the solution is 1:1:2, the concentration of sodium hydroxide in the mixed solution is 2.4mol / L, and the ultrasonic field-assisted co-precipitation method is used to control the temperature at 80 ° C and the pH value at 12.0 to prepare the precursor, and then with Lithium carbonate weighed according to the stoichiometric ratio was mixed, mechanically activated for 12 hours, calcined at 400°C for 4 hours, then calcined at 900°C for 8 hours, and finally cooled to obtain the layered solid solution cathode material Li 1.5 Ni 0.25 co 0.25 mn 0.5 o 2.5 ; Then according to Li 1.4 (Al 0.2 Ti 0.8 ) 2 (PO 4 ) 3 ) stoichiometric ratio to take H 3 PO4 、TiO 2 、A1 ...

Embodiment 3

[0015] Embodiment 3: first take by weighing nickel nitrate, cobalt nitrate, manganese nitrate and excessive 20% potassium hydroxide according to stoichiometric ratio, be mixed with concentration and be the mixed solution of 0.5mol / L nickel-cobalt-manganese, nickel, cobalt, manganese in solution The concentration ratio of the ions is 0.25:0.15:0.6, the concentration of sodium hydroxide in the mixed solution is 1.2mol / L, and the ultrasonic field-assisted co-precipitation method is used to control the temperature at 60°C and the pH value at 11.0 to prepare the precursor, and then Mixed with lithium carbonate weighed according to the stoichiometric ratio, mechanically activated for 4 hours, calcined at 400°C for 6 hours, then calcined at 850°C for 12 hours, and finally cooled to obtain the layered solid solution positive electrode material Li 1.5 Ni 0.25 co 0.15 mn 0.6 o 2.5 ; Then according to Li 1.6 (Al 0.3 Ti 0.7 ) 2 (PO 4 ) 3 ) stoichiometric ratio to take H 3 PO 4 ...

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Abstract

The invention relates to a novel lithium ion battery positive material covering the surface of a fast ionic conductor, belonging to the field of new energy materials. A preparation method of the novel positive material comprises the steps of weighing H3PO4, TiO2, Al2O3 and Li2CO3 according to the stoichiometric ratio of Li3-2x(Al1-xTix)2(PO4)3, fully mixing uniformly in a beaker, dispersing appropriate amount of layered solid solution positive material powder Li1.5NiyCozMn1-y-zO2.5 in solution, heating at 150-200 DEG C for 1-3h, and then heating at 350-450 DEG C for 2-5h. The novel positive material adopts Li3-2x(Al1-xTix)2(PO4)3 with the rapid ionic conductivity as a coating material, the transmission speed of lithium ions on the surface of the positive material is effectively increased and the rate capability of the positive material is improved.

Description

technical field [0001] The invention relates to a novel positive electrode material of a lithium ion battery coated on the surface of a fast ion conductor, belonging to the field of new energy materials. Background technique [0002] In recent years, lithium-rich solid solution cathode materials xLi 2 MnO 3 1-xLiMO 2 (0<x<1, M=Ni, Co, Mn) has become a research hotspot because of its high discharge specific capacity, good cycle performance, and high energy density, and is considered to be a new generation of lithium batteries for electric vehicles. The preferred cathode material for ion power batteries. [0003] However, with the deepening of research, it is found that lithium-rich solid solution cathode materials still have shortcomings such as poor rate performance; these shortcomings have seriously affected the application of lithium-rich solid solution cathode materials in the field of electric vehicles, so it is necessary to modify them. , to improve its rate p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/1397
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M10/0525Y02E60/10
Inventor 刘云建王启亮高彦涌王星奇王天成潘凌理
Owner 湖北江宸新能源科技有限公司
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