Preparation method of lithium ion battery positive electrode composite material and precursor thereof

A lithium-ion battery and composite material technology, which is applied in the field of new energy materials and preparation, can solve the problems of not meeting the requirements of environmental protection, low utilization rate of by-products, and many steps in the synthesis process, so as to achieve easy operation and increase product addition. The effect that the value and synthesis method are simple

Inactive Publication Date: 2012-01-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cathode composite materials obtained by these methods have the following disadvantages: the product purity is low, especially the sodium content exceeds the standard, which seriously affects the performance of the battery; the synthesis proc

Method used

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  • Preparation method of lithium ion battery positive electrode composite material and precursor thereof
  • Preparation method of lithium ion battery positive electrode composite material and precursor thereof
  • Preparation method of lithium ion battery positive electrode composite material and precursor thereof

Examples

Experimental program
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Embodiment 1

[0030] (1) 100 g of nickel chloride hydrate, cobalt chloride hydrate, and manganese chloride hydrate are weighed in a molar ratio of 1:1:1 and put into a reactor, heated to 90° C.;

[0031] (2) Pass liquid ammonia under the protection of inert gas argon or nitrogen, supplement 62.7g water, add slowly from the dropping funnel, react while stirring, the flow rate of liquid ammonia is controlled at 0.04L / min;

[0032] (3) After the reaction is complete, change to a distillation unit. Water is used as a circulating coolant in the distillation unit, and the gas receiving unit adopts water to absorb hydrogen chloride and ammonia. Heating with an electric heating mantle, the temperature is controlled at 340°C, the ammonium salt is distilled off, the solid is taken out, and dried to obtain an amorphous ternary cathode material precursor.

[0033] (4) The precursor and lithium carbonate are mixed in a ratio of 1:1:1 by metal ion and lithium ion molar ratio, mixed evenly in a planetary ...

Embodiment 2

[0036] (1) Weigh nickel chloride hydrate, cobalt chloride hydrate and manganese chloride hydrate with a molar ratio of 1:1:1 and put 100 g in total into a three-necked flask, and heat to 120° C.;

[0037] (2) Pass liquid ammonia under the protection of inert gas argon or nitrogen, react while stirring, and the flow rate of liquid ammonia is controlled at 0.08L / min;

[0038] (3) After the reaction is complete, change to a distillation unit. Water is used as a circulating coolant in the distillation unit, and the gas receiving unit adopts water to absorb hydrogen chloride and ammonia. Heating with an electric heating mantle, the temperature is controlled at 360°C, the ammonium salt is distilled off, the solid is taken out, and dried to obtain the precursor of the amorphous ternary cathode material.

[0039] (4) Mix the precursor and lithium carbonate according to the ratio of metal ion to lithium ion molar ratio of 1:118, mix the materials evenly in a planetary ball mill, sinter...

Embodiment 3

[0042] (1) 100 g of nickel chloride hydrate, cobalt chloride hydrate and manganese chloride hydrate were weighed in a molar ratio of 1:1:1 and put into a three-necked flask, heated to 110° C.;

[0043] (2) Pass liquid ammonia under the protection of inert gas argon or nitrogen, react while stirring, and the flow rate of liquid ammonia is controlled at 0.05L / min.

[0044] (3) After the reaction is complete, the distillation unit is changed into a distillation unit. In the distillation unit, water is used as a circulating coolant, and the gas receiving unit adopts water to absorb ammonium chloride. Heating with an electric heating mantle, the temperature is controlled at 355°C, the ammonium salt is distilled off, the solid is taken out, and dried to obtain the precursor of the amorphous ternary cathode material.

[0045] (4) Mix the precursor and lithium carbonate according to the ratio of metal ion to lithium ion molar ratio of 1:1.22, mix the materials evenly in a planetary ba...

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Abstract

The invention discloses a preparation method of a lithium ion battery positive electrode composite material and a precursor thereof, and in particular relates to a novel method for preparing a high-purity low-cost binary or ternary precursor and preparing a high-performance lithium ion battery binary or ternary positive electrode composite material by utilizing the precursor, belonging to the technical field of new energy materials and the preparation thereof. The method comprises the following specific steps: (1) putting salt-type solid raw materials of two or three of nickel, cobalt and manganese with crystal water into a reactor, and heating the materials to the molten state; (2) introducing ammonia under the protection of inert gas, supplementing a small amount of water or no water according to the solubility of salts at different temperatures, stirring and reacting; (3) evaporating ammonium salt after full reaction, taking the solid out, and drying so as to get the amorphous binary or ternary positive electrode composite material precursor; and (4) mixing the precursor with lithium carbonate according to a certain ratio, and further preparing the lithium ion battery positive electrode composite material through a two-section sintering method. The precursor synthetic method is simple, sodium hydroxide is avoided from being used, separation and purification are not required, and the high-purity positive electrode composite material precursor which has no impurities basically can be obtained; furthermore, no industrial waste water is discharged, and the by-product ammonium salt can further generate economic benefit; and the positive electrode composite material prepared by the precursor has excellent performances, and is convenient for industrialization.

Description

technical field [0001] The present invention relates to a method for preparing lithium-ion battery cathode composite materials, in particular to a method for preparing high-purity and low-cost binary or ternary precursors, and preparing high-performance lithium-ion battery binary or ternary precursors from the precursors The method for the positive composite material belongs to the field of new energy materials and preparation technology. Background technique [0002] In the past 10 years, lithium-ion batteries have been widely used in electronic communication fields such as mobile phones, notebook computers, and cameras, and have occupied a dominant position. New energy vehicles, which represent the development direction of the future automotive industry, are mainly powered by lithium-ion batteries. The industrialization of new energy vehicles will directly drive the rapid growth of the lithium-ion battery market. my country's automobiles are growing at a rate of 15% every...

Claims

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Application Information

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IPC IPC(8): H01M4/485
CPCY02E60/122Y02E60/10
Inventor 李新海吴贤文王志兴郭华军张云河胡启阳彭文杰岳鹏肖围
Owner CENT SOUTH UNIV
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