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A kind of preparation method of nickel-cobalt-aluminum anode material of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of different electrochemical properties of materials, affecting the electrochemical properties of materials, mixed discharge, etc., and achieve high reversible specific capacity and cycle stability Good performance and improved electrochemical performance

Inactive Publication Date: 2017-03-15
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nickel-cobalt-aluminum hydroxide, mainly nickel hydroxide, decomposes above 230°C to form NiO. When the temperature reaches 400°C, part of NiO absorbs air and oxidizes into Ni 2 o 3 , and finally when the temperature is higher than 600℃, the Ni 2 o 3 Reduced NiO with low activity; in addition, if the content of divalent nickel in nickel-cobalt-aluminum oxide is too high, the subsequent sintering process cannot be completely oxidized to trivalent nickel, and the radius of divalent nickel is very close to that of lithium ions, which is prone to mixing. , affecting the electrochemical performance of the material
Therefore, pre-sintering at different temperatures results in different Ni 2+ and Ni 3+ content of the precursor, the electrochemical performance of the final material is different

Method used

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  • A kind of preparation method of nickel-cobalt-aluminum anode material of lithium ion battery
  • A kind of preparation method of nickel-cobalt-aluminum anode material of lithium ion battery
  • A kind of preparation method of nickel-cobalt-aluminum anode material of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0040]Using nickel nitrate, cobalt nitrate and aluminum nitrate as raw materials, according to the Ni:Co:Al molar ratio of 0.8:0.15:0.05, prepare a 1mol / L mixed solution, mix the mixed solution with 2mol / L sodium hydroxide solution and 6mol / L L of ammonia solution is fed into a 2L reaction kettle in parallel through a constant flow pump. The reaction kettle contains 600mL of ammonia solution with a pH value of 10.5 and a temperature of 50°C as the bottom liquid, and the stirring speed is 600 rpm for precipitation. During the reaction, the fluctuation of pH value shall not exceed ±0.4, and the fluctuation of temperature shall not exceed ±1°C. After the precipitation reaction is complete, filter and wash several times until the pH value of the filtrate is close to 7, and the nitrate content in the filtrate is less than 1×10 -5 mol / L, dried under vacuum at 120°C to obtain a grass-green nickel-cobalt-aluminum hydroxide precursor;

[0041] The nickel-cobalt-aluminum precursor prepa...

Embodiment 2

[0044] Using nickel nitrate, cobalt nitrate and aluminum nitrate as raw materials, according to the Ni:Co:Al molar ratio of 0.8:0.15:0.05, prepare a 2mol / L mixed solution, mix the mixed solution with 5mol / L sodium hydroxide solution and 10mol / L L of ammonia solution is fed into a 2L reaction kettle in parallel through a constant flow pump. The reaction kettle contains 600mL of ammonia solution with a pH value of 11.0 and a temperature of 60°C as the bottom liquid, and the stirring speed is 1000 rpm for precipitation. During the reaction, the fluctuation of pH value shall not exceed ±0.4, and the fluctuation of temperature shall not exceed ±1°C. After the precipitation reaction is complete, filter and wash several times until the pH value of the filtrate is close to 7, and the nitrate content in the filtrate is less than 1×10 -5 mol / L, dried under vacuum at 120°C to obtain a grass-green nickel-cobalt-aluminum hydroxide precursor;

[0045] The nickel-cobalt-aluminum precursor pr...

Embodiment example 3

[0048] Using nickel nitrate, cobalt nitrate and aluminum nitrate as raw materials, according to the Ni:Co:Al molar ratio of 0.8:0.15:0.05, prepare a 1mol / L mixed solution, mix the mixed solution with 2mol / L sodium hydroxide solution and 6mol / L L of ammonia solution is fed into a 2L reaction kettle in parallel through a constant flow pump. The reaction kettle contains 600mL of ammonia solution with a pH value of 10.5 and a temperature of 60°C as the bottom liquid, and the stirring speed is 750 rpm for precipitation. During the reaction, the fluctuation of pH value shall not exceed ±0.4, and the fluctuation of temperature shall not exceed ±1°C. After the precipitation reaction is complete, filter and wash several times until the pH value of the filtrate is close to 7, and the nitrate content in the filtrate is less than 1×10 -5 mol / L, dried under vacuum at 120°C to obtain a grass-green nickel-cobalt-aluminum hydroxide precursor;

[0049] The nickel-cobalt-aluminum precursor prep...

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Abstract

The invention discloses a method for preparing nickel-cobalt-aluminum cathode material of lithium ion battery, which comprises the following steps: mixing nickel, cobalt and aluminum salt solutions, and then co-flowing a precipitating agent and a complexing agent with the above-mentioned mixed solution of nickel-cobalt-aluminum Add it into the reaction kettle for co-precipitation reaction, adjust the pH value of the system to 10~11, the temperature is 40~60°C, the stirring speed is 500~1500 rpm, and after 10~30 h of reaction, filter, wash, and dry. The hydroxide precursor is obtained; the precursor is pre-sintered at high temperature to obtain nickel-cobalt-aluminum oxide, then mixed with lithium source, sintered at high temperature in an oxygen atmosphere, and nickel-cobalt-aluminum powder is obtained after crushing and sieving. By calculating the pre-sintering loss rate of the precursor, and using XPS to analyze the contents of Ni2+ and Ni3+ in nickel-cobalt-aluminum oxides at different pre-sintering temperatures, the nickel-cobalt-aluminum oxides with the highest Ni3+ content were obtained to promote the secondary sintering process. More nickel ions are converted into Ni3+, reducing the mixing of Li+ and Ni2+, and improving the electrochemical performance of the material.

Description

technical field [0001] The invention relates to the fields of energy storage materials and electrochemistry, in particular to a preparation method of nickel-cobalt-aluminum cathode material for lithium ion batteries. Background technique [0002] Since the Japanese SONY company first successfully developed and commercialized lithium-ion batteries in 1991, lithium-ion batteries have attracted more and more attention because of their light weight, small size, high specific energy, small self-discharge, and good cycle performance. With the characteristics of low pollution and no memory effect, it has become one of the most promising green secondary batteries in the 21st century. With the development of electrode materials, battery cathode materials with their own characteristics have emerged one after another, such as lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium iron phosphate, and nickel-cobalt-manganese ternary materials. At present, lithium-i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/525
CPCH01M4/485H01M4/525Y02E60/10
Inventor 朱永明胡会利阮泽文滕祥国于元春
Owner HARBIN INST OF TECH AT WEIHAI