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Reticular porous lithium-manganese-rich-based positive electrode material for lithium ion cell and preparation method of material

A lithium-rich manganese-based lithium ion battery technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve problems such as poor conductivity, bottlenecks in rate performance, and decreased lattice order. Achieve long service life, simplify the preparation process, and improve the effect of rate performance

Active Publication Date: 2013-12-25
SHENZHEN KEXIN COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of lithium-rich manganese-based lithium-ion battery cathode material itself has poor conductivity, so that the performance under high-current charging and discharging is still not ideal, and it cannot meet the requirements of practical applications.
Especially due to the lower conductivity of Li 2 MnO 3 The existence of phases and the decrease in lattice order during the first activation process affect the transport of lithium ions, so the rate performance of this type of lithium-rich manganese-based lithium-ion battery cathode material has become one of the bottlenecks in its practical application.

Method used

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  • Reticular porous lithium-manganese-rich-based positive electrode material for lithium ion cell and preparation method of material
  • Reticular porous lithium-manganese-rich-based positive electrode material for lithium ion cell and preparation method of material
  • Reticular porous lithium-manganese-rich-based positive electrode material for lithium ion cell and preparation method of material

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Effect test

Embodiment 1

[0030] 1) According to the molar ratio of 1.236:0.56:0.16:0.08, the raw material LiNO 3 , Mn(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O was dissolved in deionized water (an excess of 3% lithium salt was added to offset the loss of lithium at high temperature) to form a transparent solution, and then sucrose with a total metal salt molar weight of 15% was added to the transparent solution, and Stir continuously until the solution becomes transparent again, then heat the solution to 80°C, and continuously evaporate to remove the water in the solution, first to obtain a sol, and finally to obtain a gel.

[0031] 2) Put the gel into a box-type furnace, heat up to 500°C at a rate of 10°C / min in an air atmosphere, heat-preserve and calcinate for 2 hours to remove organic components, and then cool to room temperature 25°C with the furnace to obtain a preliminary product. Grind the obtained preliminary product, and finally heat up to 800°C at a heating rate...

Embodiment 2

[0038] 1) According to the molar ratio of 1.236:0.54:0.13:0.13, the raw material LiNO 3 , Mn(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O was dissolved in deionized water (an excess of 3% lithium salt was added to offset the loss of lithium at high temperature) to form a transparent solution, and then 20% sucrose was added to the transparent solution, and Stir continuously until the solution becomes transparent again, then heat the solution to 80°C, and continuously evaporate to remove the water in the solution, first to obtain a sol, and finally to obtain a gel.

[0039] 2) Put the gel into a box-type furnace, heat up to 500°C at a rate of 10°C / min in an air atmosphere, heat-preserve and calcinate for 2 hours to remove organic components, and then cool to room temperature 25°C with the furnace to obtain a preliminary product. Grind the obtained preliminary product, and finally heat up to 800°C at a heating rate of 10°C / min for the second calcination....

Embodiment 3

[0046] 1) According to the molar ratio of 1.236:0.56:0.16:0.08, the raw material LiNO 3 and LiCH 3 COO·2H 2 Mixed lithium salts of O, Ni(NO 3 ) 2 ·6H 2 O and Ni(CH 3 COO) 2 4H 2 Mixed nickel salts of O, Mn(NO 3 ) 2 ·6H 2 O and Mn(CH 3 COO) 2 4H 2 Mixed manganese salts of O, Co(NO 3 ) 2 ·6H 2 O and Co(CH 3 COO) 2 4H 2 Mixed cobalt salts of O (in which nitrate accounts for 50% in each mixed salt) were dissolved in deionized water (to which an excess of 3% lithium salt was added to offset the loss of lithium at high temperature) to form a transparent solution, and then Add 10% sucrose with a molar mass of total metal salts to the transparent solution, and keep stirring until the solution becomes transparent again, then heat the solution to 80°C, and continuously evaporate to remove the water in the solution, first to obtain a sol, and finally to obtain a gel.

[0047] 2) Put the gel into a box-type furnace, heat up to 500°C at a rate of 10°C / min in an air atmos...

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Abstract

The invention discloses a preparation method of a reticular porous lithium-manganese-rich-based positive electrode material for a lithium ion cell. The preparation method comprises the following steps: dissolving lithium salt, nickel salt, manganese salt and cobalt salt into deionized water according to a certain ratio, so as to form a transparent solution; adding appropriate amount of cane sugar serving as a complexing agent according to the added metal salts, so as to form a transparent solution; heating for evaporating the solution, so as to remove water and obtain colloidal sol, and finally obtain gel; calcining the gel for 1-6 hours at the temperature of 400-600 DEG C, and then calcining the gel for 10-30 hours at the temperature of 700-950 DEG C, so as to finally form the reticular porous lithium-manganese-rich-based positive electrode material for the lithium ion cell. The preparation method is simple in process, the obtained reticular porous lithium-manganese-rich-based positive electrode material has excellent contact effect between particles and large specific surface area, thus the rate capability of the material is improved.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a mesh porous lithium-rich manganese-based lithium ion battery positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in mobile phones, cameras, notebook computers, portable appliances, etc. Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high platform voltage (about 3.2-3.7V), high energy density, and no memory effect. Early commercial production of lithium-ion batteries mainly uses LiCoO 2 As the cathode material, LiCoO 2 It has high capacity and good stability, but this kind of positive electrode material has performance, economic and environmental problems, and people need to develop a new positive electrode material system to meet people's requirements for energy storage battery energy density, power density, Saf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 毛秦钟施少君张立军谷长栋涂江平
Owner SHENZHEN KEXIN COMM TECH
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