High-compaction-density and high-first-effect ternary positive electrode material and preparation method thereof

A positive electrode material and high-pressure compaction technology, applied in chemical instruments and methods, electrical components, battery electrodes, etc., can solve the problems of low first effect and low compaction density, achieve uniform particle size, increase compaction density, Improve the effect of charging and discharging the first effect

Inactive Publication Date: 2020-04-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of low compaction density and low first effect in the above-mentioned prior art, the present invention provides a high-pressure compaction density and high first-efficiency ternary cathode material with high first effect and high compaction density and a preparation method thereof

Method used

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  • High-compaction-density and high-first-effect ternary positive electrode material and preparation method thereof
  • High-compaction-density and high-first-effect ternary positive electrode material and preparation method thereof
  • High-compaction-density and high-first-effect ternary positive electrode material and preparation method thereof

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Effect test

Embodiment 1

[0031] A high compacted density, high first effect ternary cathode material, its theoretical chemical expression is Li 0.99 Rb 0.01 Ni 0.8 co 0.1 mn 0.1 o 2 , where a=0.01.

[0032] The preparation method of above-mentioned high compacted density, high first effect ternary cathode material comprises the following steps:

[0033] (1) be 1.05:0.01:0.8:0.1:0.1 by weighing Lithium Retard (according to theoretical chemical expression Li 0.99 Rb 0.01 Ni 0.8 co 0.1 mn 0.1 o 2 , the mol ratio of Li, Rb, Ni, Co, Mn should be 0.99:0.01:0.8:0.1:0.1, that is, the actual amount of Lithium Retard in the present embodiment is excessive 5%), rubidium chloride, nickel nitrate, cobalt nitrate, Manganese nitrate for subsequent steps;

[0034] (2) Nickel nitrate, cobalt nitrate, manganese nitrate are mixed with deionized water to obtain an aqueous phase; wherein, the consumption of deionized water is 3.7 times of the total mass of nickel nitrate, cobalt nitrate and manganese nitrate; ...

Embodiment 2

[0047] A high compacted density, high first effect ternary cathode material, its theoretical chemical expression is Li 0.9 Rb 0.1 Ni 0.8 co 0.1 mn 0.1 o 2 , where a=0.1.

[0048] The preparation method of above-mentioned high compacted density, high first effect ternary cathode material comprises the following steps:

[0049] (1) be 1.05:0.1:0.8:0.1:0.1 by Li, Rb, Ni, Co, the mol ratio of Mn and take Lithium Hydroxide (excessive about 15% with respect to the actual consumption of Lithium Hydroxide of theoretical chemical expression), Rubidium carbonate, nickel nitrate, cobalt nitrate, manganese nitrate for subsequent steps;

[0050] (2) Nickel nitrate, cobalt nitrate, manganese nitrate are mixed with deionized water to obtain an aqueous phase; wherein, the consumption of deionized water is 3 times of the total mass of nickel nitrate, cobalt nitrate and manganese nitrate;

[0051] (3) Mix Emcol PS-50 and Altlas G-3915 to prepare an emulsifier with an HLB value of 3, then...

Embodiment 3

[0058] A high compacted density, high first effect ternary cathode material, its theoretical chemical expression is Li 0.95 Rb 0.05 Ni 0.8 co 0.1 mn 0.1 o 2 , where a=0.05.

[0059] The preparation method of above-mentioned high compacted density, high first effect ternary cathode material comprises the following steps:

[0060] (1) be 1.05:0.05:0.8:0.1:0.1 by Li, Rb, Ni, Co, the mol ratio of Mn and take Lithium Hydroxide (excessive about 10% with respect to the actual consumption of Lithium Hydroxide of theoretical chemical expression), Rubidium carbonate, nickel chloride, cobalt chloride, manganese chloride for subsequent steps;

[0061] (2) Nickel chloride, cobalt chloride, manganese chloride are mixed with deionized water to obtain a water phase; wherein, the consumption of deionized water is 5 times of the total mass of nickel nitrate, cobalt nitrate and manganese nitrate;

[0062] (3) Mix Emcol EL-50 and Altlas G-3720 to prepare an emulsifier with an HLB value of ...

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Abstract

The invention relates to a high-compaction-density and high-first-effect ternary positive electrode material and a preparation method thereof, the theoretical chemical expression of the high-compaction-density and high-first-effect ternary positive electrode material is Li<1-a> baNi<0.8>Co<0.1>Mn<0.1>O<2>, and a is greater than or equal to 0.001 and less than or equal to 0.1. The preparation method of the ternary positive electrode material is characterized by comprising: mixing a nickel source, a cobalt source and a manganese source according to a certain proportion; obtaining a ternary material mixture; adding the mixture into water according to a certain proportion to obtain a water phase; introducing ammonia gas, adding an oil phase, preparing a precursor by using a reversed-phase microemulsion method; and uniformly mixing and sintering the precursor, a lithium source and rubidium salt at a certain temperature to obtain a high-compaction-density rubidium ion doped material with uniform particle size, replacing lithium ions in the ternary material in a rubidium ion doping manner, and enabling an active material to be in better contact, so that the ternary material has better compaction density and higher charge-discharge first effect.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a high compacted density, high first-efficiency ternary cathode material and a preparation method thereof. Background technique [0002] Nickel-rich ternary materials, as lithium-ion battery cathode materials, have high reversible capacity and become one of the most promising lithium-ion battery cathode materials in the field of new energy vehicles. However, the main problems currently existing in high-nickel ternary materials are low compaction density and low first effect. For the low compaction density of high-nickel cathode materials, the current explanation is mainly: the internal gap of the particles is large; for the irreversible capacity of high-nickel cathode materials in the first charge and discharge process, the current explanation is mainly: after the first delithiation, in the The kinetic properties of the material decrease during lithium intercalati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525C01G53/00H01M10/0525
CPCC01G53/50C01P2004/03H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 唐浩林李丹鹏朱泰洋林文
Owner WUHAN UNIV OF TECH
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