Method for preparing positive composite positive material precursor for lithium ion batteries

A lithium-ion battery and composite material technology, applied in the field of new energy materials and preparation, can solve the problems of low utilization rate of by-products, failure to meet the requirements of environmental protection, and many steps in the synthesis process, so as to increase the added value of products and facilitate The effect of simple operation and synthesis method

Inactive Publication Date: 2019-03-05
成都乐沸科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the positive electrode 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 process steps are relatively many, and the utilization rate of by-products is not high, resulting in high production costs. ; There are many industrial wastewaters in the synthesis process, or the requirements of environmental protection cannot be met, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (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.;

[0028] (2) Feed liquid ammonia under the protection of inert gas argon or nitrogen, supplement 62.7g water, pressurize to 1.2Mpa, slowly add by dropping funnel, react while stirring, the flow rate of liquid ammonia is controlled at 0.04L / min;

[0029] (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 the precursor of the amorphous ternary positive electrode material.

[0030] (4) The precursor and lithium carbonate are mixed in a ratio of 1:1:1 by metal ion and lithium ion molar ...

Embodiment 2

[0033] (1) Take nickel chloride hydrate, cobalt chloride hydrate, and manganese chloride hydrate with a molar ratio of 1: 1: 1 and put 100g in total into a three-necked flask, and heat to 120°C;

[0034] (2) Pass liquid ammonia under the protection of inert gas argon or nitrogen, pressurize to 1.4Mpa, react while stirring, and control the flow rate of liquid ammonia at 0.08L / min;

[0035] (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 an amorphous ternary cathode material precursor.

[0036] (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,...

Embodiment 3

[0039] (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.;

[0040](2) Pass liquid ammonia under the protection of inert gas argon or nitrogen, pressurize to 1.3pa, react while stirring, and control the flow rate of liquid ammonia at 0.05L / min.

[0041] (3) After the reaction is complete, change to 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 positive electrode material.

[0042] (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 ball ...

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Abstract

The invention discloses a method for preparing a positive composite positive material precursor for lithium ion batteries, and the method is simple and convenient in technology. The method comprises the following specific steps: (1) putting any two or three salt solid raw materials of nickel, cobalt and manganese with crystal water into a reactor, and heating to a molten state; (2) introducing ammonia gas under inert gas shielding, carrying out pressurization until 1.2 to 1.4 Mpa, appropriately supplementing a small mount of water or not adding water according to the solubility of the salt atdifferent temperatures, and reacting while stirring; (3) evaporating ammonium salt after the reaction is completed, taking out a solid, and drying to obtain an amorphous binary or ternary positive composite material precursor; and (4) mixing the precursor with lithium carbonate in proportion, and carrying out a two-stage sintering process to prepare the positive composite material for lithium ionbatteries. The positive composite material prepared by the precursor is excellent in performance, 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 cathode 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 automobile industry, are mainly driven 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 y...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张优雨
Owner 成都乐沸科技有限责任公司
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