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A kind of positive electrode material of lithium ion battery and modification method thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult synthesis of lithium nickelate, poor cycle performance, short platform discharge time, etc., to improve cycle life and stability , improve the rate performance, and the effect of simple preparation process

Active Publication Date: 2018-07-17
ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium cobaltate is the earliest material for industrialization and commercialization. The electrochemical performance of lithium cobaltate is relatively stable, good conductivity, high voltage platform, good cycle performance, and compaction density can reach 4.0g / cm³, but the lithium cobaltate The specific capacity is relatively low, and cobalt is highly toxic, cobalt resources are scarce, expensive, and its overcharge safety performance is poor
The synthesis of lithium nickelate is difficult, and the reproducibility of the material is poor; although the layered lithium manganate has a high specific capacity, its structural stability is poor, while the specific capacity of the spinel lithium manganate is low, and the high temperature structure needs to be strengthened
Although the nickel-cobalt lithium manganate ternary material has the characteristics of good thermal stability, high specific capacity at high potential and low raw material cost, the voltage platform of the ternary material is low, the platform discharge time is short, the compaction density is low, and the cycle poor performance
[0004] Nickel-cobalt lithium aluminate cathode material has the advantages of high specific capacity, good cycle performance and cheap raw materials, but its low electrical conductivity and low compaction density limit the application of this material in high-energy-density lithium-ion batteries. The modification of the material is imperative

Method used

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  • A kind of positive electrode material of lithium ion battery and modification method thereof
  • A kind of positive electrode material of lithium ion battery and modification method thereof
  • A kind of positive electrode material of lithium ion battery and modification method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Li with a mass ratio of 0.01:1 2 RuO 3 and LiNi 0.8 co 0.15 Al 0.05 o 2 Perform wet mixing to make Li 2 RuO 3 Evenly coated in LiNi 0.8 co 0.15 Al 0.05 o 2 The surface of the particles is uniformly mixed and then spray-dried; the dried mixed material is calcined in an air atmosphere at 500° C. for 10 hours, cooled, pulverized, and sieved to obtain a coated and modified positive electrode material.

[0032] The electrochemical performance test of the material is tested at 25°C with the blue battery test system, and the test voltage range is 3V to 4.3V; the rate performance test conditions: 0.2C charge and discharge once, 0.2C charge 0.5C / 1C / 5C / 10C Each discharge once; cycle performance test conditions: charge and discharge at a rate of 1C, cycle for 500 cycles, and investigate the capacity retention rate. The discharge specific capacity of the material at 0.2C rate is 191mAh / g, the discharge specific capacity at 0.5C rate is 187 mAh / g, the discharge specific c...

Embodiment 2

[0034] Li with a mass ratio of 0.03:1 2 RuO 3 and LiNi 0.75 co 0.2 Al 0.05 o 2 Perform wet mixing to make Li 2 RuO 3 Evenly coated in LiNi 0.75 co 0.2 Al 0.05 o 2 The particle surface is uniformly mixed and then spray-dried; the dried mixed material is calcined in an oxygen atmosphere at 600° C. for 8 hours, cooled, pulverized, and sieved to obtain a coated and modified positive electrode material.

Embodiment 3

[0036] Using ruthenium dioxide, nickel hydroxide, tricobalt tetroxide, lithium carbonate and aluminum oxide as raw materials respectively according to Li 2 RuO 3 and LiNi 0.7 co0.2 Al 0.1 o 2 The stoichiometric ratio was mixed, mixed evenly, and then spray-dried; the dried mixed material was calcined in an oxygen atmosphere at 900 ° C for 30 hours, cooled, crushed, and sieved to obtain a doped modified positive electrode material.

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Abstract

The invention relates to a positive pole material for a lithium ion battery and a modification method thereof. The general chemical formula of the material is LiNi1-a-bCoaAlbO2 / Li2RuO3, wherein a is larger than 0.1 and smaller than 0.3, b is larger than 0.01 and smaller than 0.2, and 1-a-b is larger than zero and smaller than 1; Li2RuO3 serves as clad materials or doped materials; the mass ratio of Li2RuO3 to LiNi1-a-bCoaAlbO2 is 0.01-0.2:1. The modification method comprises the steps of wet mixing, spray drying, calcining, cooling, smashing and sieving, or the steps of mixing, surface treatment, calcining, cooling, smashing and sieving. The positive pole material for the lithium ion battery and the modification method thereof has the advantages that the cycle life of the lithium ion battery is prolonged, and the stability and the rate capacity of the lithium ion battery are improved; the machining property of the material can be improved, and the uniformity of pole pieces is guaranteed; the preparation technology is simple, the period is short, the efficiency is high, and scale production can be achieved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery cathode material and a modification method thereof. Background technique [0002] As a new type of high-energy battery, lithium-ion batteries have the advantages of high energy density, good cycle performance, long service life and no memory effect. They are widely used in portable mobile electronic products and electric vehicles. The positive electrode material is used as a lithium-ion battery. One of the core components that greatly affects the performance of lithium-ion batteries. [0003] At present, the most widely used lithium-ion cathode materials are mainly lithium cobaltate, lithium nickelate, lithium manganate and nickel-cobalt lithium manganate ternary materials. Lithium cobaltate is the earliest material for industrialization and commercialization. The electrochemical performance of lithium cobaltate is relatively stable, good conductivity, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 毛玉琴韩珽
Owner ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD