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Lithium ion battery, positive electrode material of lithium ion battery and preparation method for positive electrode material

A positive electrode material, lithium ion technology, applied in the field of positive electrode materials and its preparation, can solve the problems of not much help in improving the rate, the limitation of the improvement effect of the rate performance, and the difficulty of obtaining uniform mixing at the nanometer level, so as to achieve inhibition of dissolution and side effects. Response, improved cycle stability, and broad prospects for large-scale production

Active Publication Date: 2016-03-23
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these materials, LiCoO 2 It is one of the most mature materials for commercialization, especially in consumer electronics, which occupies a large market share; but the disadvantage is that Co is a scarce resource, expensive, and pollutes the environment. The structure becomes unstable after 4.3V, which leads to a big challenge in terms of safety
It can be seen that the above-mentioned coating method is indeed of great help to improve the first-time efficiency and cycle stability of Li-Ni-Co-Mn ternary materials, but because these coating materials themselves have poor ion conductivity, the coating The overlay method doesn't do much to improve the magnification
In addition, it was proposed to modify the lithium-rich manganese-based lithium-ion battery cathode material doped with rare earth elements by using a fast ion conductor phase. temperature range; however, due to the Li 2 MnO 3 The structure itself is not activated, and it is synthesized by a solid-phase method. It is difficult to obtain uniform mixing at the nanometer level between different material particles, so the improvement effect on the rate performance is limited to a certain extent.

Method used

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  • Lithium ion battery, positive electrode material of lithium ion battery and preparation method for positive electrode material
  • Lithium ion battery, positive electrode material of lithium ion battery and preparation method for positive electrode material
  • Lithium ion battery, positive electrode material of lithium ion battery and preparation method for positive electrode material

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Effect test

Embodiment 1

[0042] Preparation of cathode material:

[0043] a) Weigh lithium hydroxide and boric acid at a molar ratio of 1:0.5, dissolve them in deionized water, add 10ml of nitric acid, and stir at a speed of 70r / min at a temperature of 80°C to make dissolve;

[0044] b) According to Li 2 O-mB 2 o 3 Accounting for the mass fraction of the bulk material and the fast ion conductor material is 0.5% and weighs Li[Li 0.22 Ni 0.17 mn 0.61 ]O 2 Suspend the powder material into the solution of a) and continue to sonicate for 1 hour in a water bath at 80°C, then stir to make Li[Li 0.22 Ni 0.17 mn 0.61 ]O 2 The powder is evenly dispersed in the solution a, and after the dispersion is uniform, all the solvents in the solution are evaporated to obtain a uniformly mixed composite material;

[0045] c) heat-treat the mixed material obtained in step b at 350°C for 3 hours to obtain the fast ion conductor Li 2 O-mB 2 o 3 Coated lithium-rich manganese-based cathode materials.

[0046] f...

Embodiment 2

[0050] Preparation of cathode material:

[0051] a) Weigh Li according to the molar ratio of 1.5:1:1.5 2 CO 3 , V 2 o 5 and NH 4 h 2 PO 4 , dissolve it in absolute ethanol, add 50ml of hydrochloric acid, and stir at a speed of 150r / min at a temperature of 80°C to dissolve it;

[0052] b) According to Li 3 V 2 (PO 4 ) 3 Accounting for 5% of the mass fraction of bulk material and fast ion conductor material, weigh Li[Li 0.14 Ni 0.15 co 0.14 mn 0.57 ]O 2 Suspend the powder material into the solution a, continue ultrasonication for 1 hour in a water bath at 80°C, and then stir to make Li[Li 0.14 Ni 0.15 co 0.14 mn 0.57 ]O 2 The powder is uniformly dispersed in the solution of a), and after the dispersion is uniform, all the solvents in the solution are evaporated to obtain a uniformly mixed composite material;

[0053] c) heat-treat the mixed material obtained in step b at 500°C for 10 hours to obtain the fast ion conductor Li 3 V 2 (PO 4 ) 3 Coated lithium...

Embodiment 3

[0057] Preparation of positive electrode material:

[0058] a) Weigh Li according to the molar ratio of 1:1:1 2 CO 3 , Al(NO 3 ) 3 and SiO 2 , dissolve it in absolute ethanol, add 15ml of sulfuric acid, and stir at a speed of 240r / min at a temperature of 80°C to dissolve it;

[0059] b) According to Li 2 O-AlO-SiO 2 Accounting for 12% of the mass fraction of bulk material and fast ion conductor material, weigh Li[Li 0.3 Cr 0.05 mn 0.65 ]O 2 Suspend the powder material into the solution of a) and continue ultrasonication for 1 hour in a water bath at 80°C, then stir to make Li[Li 0.3 Cr 0.05 mn 0.65 ]O 2The powder is evenly dispersed in the solution a, and after the dispersion is uniform, all the solvents in the solution are evaporated to obtain a uniformly mixed composite material;

[0060] c) Heat-treat the mixed material obtained in step b at 600°C for 20 hours to obtain the fast ion conductor Li 2 O-AlO-SiO 2 Coated lithium-rich manganese-based cathode mater...

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Abstract

The invention discloses a lithium ion battery, a positive electrode material of the lithium ion battery and a preparation method for the positive electrode material. The positive electrode material is a lithium-rich manganese-base positive electrode material with the surface coated with a fast ion conductor material, and is prepared with a liquid phase method; and the lithium ion battery is a battery taking the positive electrode material as a positive active substance. Compared with the prior art, the positive electrode material of the lithium ion battery adopts a fast ion conductor as a surface coating material, so that the rate performance and the cycle stability under high voltage are greatly improved, and the battery taking the positive electrode material as the positive active substance has the advantages of high rate performance, high specific capacity, high cycle stability, high first efficiency and the like.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically, the invention relates to a positive electrode material and a preparation method thereof. Background technique [0002] At present, the key factors that limit the energy density and price of lithium-ion batteries are mainly in the cathode material. The existing cathode materials on the market are mainly based on layered LiCoO 2 Mainly, spinel lithium manganate, layered lithium manganate, layered nickel cobalt lithium manganate, olivine lithium iron phosphate, etc. also occupy a certain market share. Among these materials, LiCoO 2 It is one of the most mature materials for commercialization, especially in consumer electronics, which occupies a large market share; but the disadvantage is that Co is a scarce resource, expensive, and pollutes the environment. The structure becomes unstable after 4.3V, which leads to a big challenge in terms of safety. Manganese LiMnO 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 何金铧张小细罗文辉
Owner CONTEMPORARY AMPEREX TECH CO
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