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High-capacity nickel-cobalt-based lithium ion positive electrode material and preparation method thereof

A positive electrode material and lithium ion technology, applied in the field of high-capacity nickel-cobalt-based lithium-ion battery positive electrode material and its preparation, can solve the problems of poor thermal stability, low initial charge and discharge efficiency, and small environmental pollution, and achieve consistent particle size and efficient Conducive to the control of morphology and the effect of adequate response

Inactive Publication Date: 2015-07-01
NANTONG RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] LiNi x co 1-x o 2 (0.62+ Difficult to completely oxidize to Ni 3+ , resulting in Ni during the high-temperature crystallization process 2+ with you 3+ There is a phenomenon of mixed cations between them, which will lead to defects such as poor thermal stability and low initial charge and discharge efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Precursor preparation: Ni:Co=0.6:0.4 was prepared into 0.5mol / L mixed solution A1, prepared 1.5mol / L sodium hydroxide solution and 0.5mol / L ammonium sulfate solution; poured pure water into the reaction vessel, And use 1.5mol / L sodium hydroxide solution to adjust the pH value of the initial solution to 8.5, adjust the temperature in the reaction vessel to 40°C, and the rotation speed to 200 r / min, and feed nitrogen; adjust the flow rate of the A1 solution to 20L / min, and at the same time Slowly add sodium hydroxide and ammonium sulfate dropwise, and when the particle size reaches the requirement, perform solid-liquid separation and dry to obtain the desired precursor A2.

[0030] Preparation of positive electrode material: Lithium hydroxide, A2, and aluminum hydroxide are prepared according to the molecular formula Li p Ni x co 1-x m m o 2 Mixing in the ratio, where p=1.25, x=0.6, m=0.12, the sintering temperature is controlled at 1050°C, the sintering time is 40h, ...

Embodiment 2

[0035] Precursor preparation: Ni:Co=0.85:0.15 is formulated into 3mol / L mixed solution A1, and 12mol / L sodium hydroxide solution and 5mol / L ammonium sulfate solution are prepared; pure water is injected into the reaction vessel, and 8mol / L L sodium hydroxide solution to adjust the pH value of the initial solution to 13.5, adjust the temperature in the reaction vessel to 80°C, the rotation speed to 200 r / min, and nitrogen gas; adjust the flow rate of the A1 solution to 3L / min, and slowly add hydrogen dropwise Sodium oxide and ammonium sulfate, when the particle size reaches the requirement, perform solid-liquid separation and dry to obtain the desired precursor A2.

[0036] Preparation of positive electrode material: Lithium hydroxide, A2, and aluminum hydroxide are prepared according to the molecular formula Li p Ni x co 1-x m m o 2 Mixing in the ratio, where p=0.95, x=0.85, m=0.01, the sintering temperature is controlled at 400°C, the sintering time is 4h, oxygen is intro...

Embodiment 3

[0041] Precursor preparation: Ni:Co=0.80:0.20 is formulated into 2mol / L mixed solution A1, and 2.5mol / L sodium hydroxide solution and 1.8mol / L ammonium sulfate solution are prepared; pure water is injected into the reaction vessel, and 2.5mol / L sodium hydroxide solution to adjust the pH value of the initial solution to 12, adjust the temperature in the reaction vessel to 60°C, and the rotation speed to 500 r / min, and feed nitrogen; adjust the flow rate of the A1 solution to 10L / min, and slowly Sodium hydroxide and ammonium sulfate were added dropwise, and when the particle size reached the requirement, solid-liquid separation was performed and dried to obtain the desired precursor A2.

[0042] Preparation of positive electrode material: Lithium hydroxide, A2, and aluminum hydroxide are prepared according to the molecular formula Li p Ni x co 1-x m m o 2 Mixing in the ratio, where p=0.11, x=0.80, m=0.04, the sintering temperature is controlled at 400°C, the sintering time i...

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Abstract

The invention discloses a high-capacity nickel-cobalt-based lithium ion positive electrode material. The positive electrode material of a lithium ion secondary battery consists of secondary particles formed by aggregating primary particles or the primary particles or mixed particles of the primary particles and the secondary particles. The preparation method comprises the following steps: preparing a precursor of the positive electrode material of the lithium ion secondary battery and preparing the positive electrode material of the lithium ion secondary battery. According to the positive electrode material disclosed by the invention, a nickel-cobalt binary precursor is subjected to continuous co-precipitation reaction, elements are uniformly mixed, the reaction is full, and the morphology is beneficial to be controlled. Moreover, the continuous production is realized, the production efficiency is improved, and the granularity tends to be uniform. According to the binary high-nickel material, the proper elements are doped and coated, the cation mixing phenomenon is reduced, the structure is stabilized, the electrochemical performance of the battery is improved, and the safety performance and high-temperature performance of the battery material are improved.

Description

technical field [0001] The invention specifically relates to a lithium ion battery positive electrode material, in particular to a high-capacity nickel-cobalt-based lithium ion battery positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of light weight, small size, high discharge platform, large capacity, long cycle life, and no memory effect, so they are widely used in mobile electronic devices such as mobile phones and notebook computers, and are also used in artificial satellites, electric vehicles, etc. Automotive, aerospace and other fields. [0003] LiNi x co 1-x o 2 (0.6<x<1) The positive electrode material has the advantages of lithium cobaltate and lithium nickelate, high discharge specific capacity, good cycle performance, low cost and less environmental pollution, but due to the presence of Ni in high-nickel materials 2+ Difficult to completely oxidize to Ni 3+ , resulting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/62
CPCH01M4/139H01M4/362H01M4/366H01M4/525H01M10/0525Y02E60/10C01B25/36C01G51/00C01G53/44C01P2004/80C01P2006/40H01M4/62
Inventor 李兴翠池田一崇张永虎宋文锋李巧玲许国干
Owner NANTONG RESHINE NEW MATERIAL
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