Method for making lithium-included pole material with inter-metal compound of multi-element metal

A technology of intermetallic compounds and multiple metals, which is applied in the field of materials and electrochemistry, can solve the problems of shortening the production process of electrode materials, complex doping modification process, and many reaction by-products, and achieves easy large-scale clean industrial production and shortens the production process. Reaction process, the effect of short reaction process

Inactive Publication Date: 2008-08-06
SICHUAN UNIV
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  • Abstract
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the common coexistence shortcomings of current electrode materials such as single raw material, complex doping modification process, many reaction by-products and high production cost, and integrate knowledge from different disciplines, start with raw materials, synthetic routes and processes, and directly price Inexpensive and easy-to-obtain intermetallic compounds of multiple metals as raw materials, and use the advantages of raw material diversity and multi-element coexistence to design and develop new electrode materials, shorten the production process of electrode materials, reduce the cost of multi-component composite electrode materials, and broaden the scope of multiple metals. The application fields of intermetallic compounds can improve the recycling efficiency and utilization rate of resources, and realize energy saving and comprehensive utilization of resources.

Method used

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  • Method for making lithium-included pole material with inter-metal compound of multi-element metal

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Effect test

Embodiment 1

[0020] Ferrovanadium FeV by solid phase method 6 Preparation of Li as raw material 3 V 2 (PO 4 ) 3 Iron-doped Li 3 Fe 0.3 V 1.8 (PO 4 ) 3 Cathode material, in FeV 6 as iron source and vanadium source, with LiH 2 PO 4 Lithium source and phosphorus source, the ratio of the two substances is 1:10.8. After ball milling for 5 hours, put it into a controlled atmosphere tube furnace at 200-850°C for 0.5-10 hours and control a certain air flow. , using oxygen in the air as the oxygen source, with N 2 or CO burned as C 2 As an inert protective gas, Li 3 Fe 0.3 V 1.8 (PO 4 ) 3 materials, the reaction equation is as follows:

[0021] 3FeV 6 +30LiH 2 PO 4 +15O 2 —→10Li 3 Fe 0.3 V 1.8 (PO 4 ) 3 +30H 2 o

[0022] Not only iron vanadium FeV can be used 6 The impurity elements in the electrode material can be modified by different in-situ self-doping, and different carbon or carbon-containing compounds can be added to the precursor to form Li 3 Fe 0.3 V 1.8 (P...

Embodiment 2

[0024] Preparation of Li by reaction pulverization method using ferro-titanium FeTi as raw material 4 / 3 Ti 5 / 3 o 4 Iron-doped LiTiFeO 4 Negative electrode material, FeTi is used as iron source and titanium source, and metal Li is used as lithium source. The ratio of the two substances is 1:1.05. After high-energy ball milling for 20 hours, put it into a muffle furnace at 200-900 ° C. Roasting in air atmosphere for 0.5-15h, using oxygen in the air as oxygen source, to obtain LiTiFeO 4 Electrode material, the reaction equation is as follows:

[0025] FeTi+Li+2O 2 —→LiTiFeO 4

[0026] Different in-situ self-doping modifications can be performed on electrode materials by using impurity elements in titanium-iron FeTi.

Embodiment 3

[0028] Preparation of LiMn from Manganese Nickel NiMn as Raw Materials by Rheological Phase Method 2 o 4 Nickel-doped LiNiMnO 4 Cathode material, with NiMn as nickel source and manganese source, with Li 2 O is the lithium source, and the molar ratio of the two substances is 2:1.08. Ethanol is used as a solvent. After sufficient ball milling or grinding to form a rheological phase, it is put into a muffle furnace at 200-900°C for 2-25 hours. Oxygen in LiNiMnO was obtained as the oxygen source 4 Electrode material, the reaction equation is as follows:

[0029] 4NiMn+2Li 2 O+7O 2 —→4LiNiMnO 4

[0030] Different in-situ self-doping modifications can be performed on electrode materials by using impurity elements in manganese nickel NiMn.

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Abstract

The invention relates to a method for preparing a lithium-containing electrode material with a multi-metal intermetallic compound, in particular to the method for preparing a Li-ion battery and a multiple composite electrode material of a super-capacitor and belongs to the materials and electrochemistry field. The multi-metal intermetallic compound comprises at least two kinds of metallic elements at the same time, is allowed to comprise other non-metallic elements as impurities, provides partial or all metals for the electrode materials and can be minerals, smelt products of the minerals, by-products or recycling products in chemical industry, or can be self-made. Compared with the prior art, the raw material adopted in the method is wide in range, simple in synthesizing process, low in price, short in reaction process and easy to obtain; in-situ self-doped modification can be carried out on the electrode material with the self-contained impurities, the cycling efficiency and utilization rate of resources are very notable and the electrode material is low in cost and practical, which brings convenience to the scaled industry cleaning production and is favorable for decreasing consumption, saving energy and the comprehensive utilization of resources.

Description

technical field [0001] The invention relates to a method for preparing lithium-containing electrode materials by using intermetallic compounds of multi-element metals, in particular to a method for preparing multi-element composite electrode materials for lithium ion batteries and supercapacitors, and belongs to the field of materials and electrochemistry. Background technique [0002] With the rapid development of electric vehicles, electric tools and portable electronic products, the market and demand for lithium-ion batteries and supercapacitors are increasing, and the performance requirements are getting higher and higher, and electrode materials are one of the factors that affect their electrochemical performance. The key factor. At present, in order to improve the performance of electrode materials, most of them are directed towards LiCoO 2 , LiMnO 2 , LiMn 2 o 4 , Li 4 mn 5 o 12 , LiNiO 2 , Li 1+x V 3 o 8 、LiFePO 4 and Li 4 Ti 5 o 12 The other electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04H01G9/042C01D15/00C01G1/02C04B35/622H01M4/38
CPCY02E60/10Y02E60/13
Inventor 王贵欣闫康平
Owner SICHUAN UNIV
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