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TiB<2>-coated lithium nickel cobalt manganate positive electrode material and preparation method therefor

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the field of lithium-ion battery positive electrode materials and its preparation, and achieves the effects of simple operation, low cost, and increased conductivity

Inactive Publication Date: 2018-03-13
CHANGZHOU POWERGENIE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiB has not been found 2 Literature and patents on modified ternary cathode materials for lithium-ion batteries

Method used

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  • TiB&lt;2&gt;-coated lithium nickel cobalt manganate positive electrode material and preparation method therefor
  • TiB&lt;2&gt;-coated lithium nickel cobalt manganate positive electrode material and preparation method therefor
  • TiB&lt;2&gt;-coated lithium nickel cobalt manganate positive electrode material and preparation method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The nickel cobalt lithium manganese oxide LiNi prepared in the comparative example 0.5 co 0.2 mn 0.3 o 2 TiB with an average primary particle size of 100-500nm 2 Dry Blend, LiNi 0.5 co 0.2 mn 0.3 o 2 with TiB 2 According to the mass ratio of 1000:5, put it into the ball milling tank lined with polytetrafluoroethylene, use agate balls according to the ball material mass ratio of 1:4.5, and ball milling mixing and coating at the speed of 250 rpm in the ball milling tank After 2 hours, put the mixed powder into a sagger and smooth it, sinter at 820°C for 6 hours in an air atmosphere, cool naturally after completion, take out the powder and sieve to obtain TiB 2 Coated LiNi 0.5 co 0.2 mn 0.3 o 2 Sample S523T-1.

Embodiment 2

[0032] The nickel cobalt lithium manganese oxide LiNi prepared in the comparative example 0.5 co 0.2 mn 0.3 o 2 TiB with an average primary particle size of 500-1000nm 2 Dry Blend, LiNi 0.5 co 0.2 mn 0.3 o 2 with TiB 2 According to the mass ratio of 1000:5, put it into the ball milling tank lined with polytetrafluoroethylene, use agate balls according to the ball material mass ratio of 1:4.5, and ball milling mixing and coating at the speed of 250 rpm in the ball milling tank After 2 hours, put the mixed powder into a sagger and smooth it, sinter at 820°C for 6 hours in an air atmosphere, cool naturally after completion, take out the powder and sieve to obtain TiB 2 Coated LiNi 0.5 co 0.2 mn 0.3 o 2 Sample S523T-2.

Embodiment 3

[0034] The nickel-cobalt lithium manganese oxide LiNi prepared by sintering 0.6 co 0.2 mn 0.2 o 2 TiB with an average primary particle size of 100-500nm 2 Dry Blend, LiNi 0.6 co 0.2 mn 0.6 o2 with TiB 2 According to the mass ratio of 1000:5, put it into the ball milling tank lined with polytetrafluoroethylene, use agate balls according to the ball material mass ratio of 1:4.5, and ball milling mixing and coating at the speed of 250 rpm in the ball milling tank After 2 hours, put the mixed powder into a sagger and smooth it, sinter at 780°C for 6 hours in an air atmosphere, cool naturally after completion, take out the powder and sieve to obtain TiB 2 Coated LiNi 0.6 co 0.2 mn 0.6 o 2 Sample S622T-1.

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Abstract

The invention discloses a TiB<2>-coated lithium nickel cobalt manganate positive electrode material and a preparation method therefor. The positive electrode material has the chemical formula of LiNi<x>Co<y>Mn<z>O<2>, wherein a is greater than or equal to 0.9 and less than or equal to 1.2; x+y+z is equal to 1; the TiB<2> granules are 20-2,000nm in dimensions; and the mass ratio of TiB<2> to thelithium nickel cobalt manganate positive electrode material is (0.002-0.02) to 1. The conductivity of the positive electrode material is improved, and surface polarization effect of the material in the charging-discharging process of the material is lowered effectively, thereby improving rate capability and cycle performance of the material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials and preparation thereof, in particular to a TiB2-coated nickel-cobalt lithium manganese oxide cathode material and a preparation method thereof. Background technique [0002] Nickel cobalt lithium manganese oxide ternary cathode material has been widely studied since it was first reported in 1999. The ternary cathode material combines lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide through the synergistic effect of Ni-Co-Mn. The advantages of the three materials: high capacity characteristics of lithium nickel oxide, high safety performance and low cost of lithium manganese oxide, good cycle performance of lithium cobalt oxide, has become one of the most promising cathode materials for lithium ion batteries in recent years . At present, the country is vigorously developing new energy vehicles. As a high-capacity, high-energy-density lithium-io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 韦建良孙姣丽周文泽庄文杰
Owner CHANGZHOU POWERGENIE MATERIALS
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