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Anode material for lithium ion battery and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of poor cycle performance and low capacity, and achieve the effects of good cycle performance, alleviation of volume changes, and simple preparation process.

Active Publication Date: 2011-05-04
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of poor cycle performance and low capacity of common lithium-ion battery negative electrode materials, thereby providing a lithium-ion battery with high lithium storage capacity and good cycle performance without multiple cycles. negative electrode material

Method used

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  • Anode material for lithium ion battery and preparation method thereof
  • Anode material for lithium ion battery and preparation method thereof
  • Anode material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] At normal pressure and in the temperature range of 0-5°C, Fe(NO 3 ) 3 Uniformly disperse in pyrrole, then slowly add oxidant hydrogen peroxide (H 2 o 2 ). where Fe(NO 3 ) 3 The molar ratio to the oxidant is 1:3, Fe(NO 3 ) 3 The molar ratio to pyrrole is 1:1. After fully stirring and reacting for 8 hours, the complex (black solid) of Fe and polypyrrole was obtained through filtration, washing and drying.

[0031]The lithium storage performance of the Fe / polypyrrole complex was investigated by a button-type simulated battery. The Fe / polypyrrole complex was used as the working electrode of the coin cell. The preparation method of the working electrode sheet is as follows: under normal temperature and pressure, the complex powder is uniformly mixed with the N-methylpyrrolidone (NMP) solution of conductive carbon black and polyvinylidene fluoride (PVDF) (the weight ratio of the three after drying is 80:10:10), the slurry is prepared and evenly coated on the copper ...

Embodiment 2

[0036] Add Co(NO 3 ) 2 And evenly disperse, then add the oxidant hydrogen peroxide (H 2 o 2 ). After fully reacting, filtering, washing and drying, a black Co / polypyrrole complex solid powder is obtained.

[0037] The preparation of the working electrode of the button-type simulated battery, the assembly process and conditions of the battery and the test method are the same as in Example 1, and the charge-discharge curve of the simulated battery is as follows: image 3 shown. from image 3 It can be seen that the complex of Co and polypyrrole formed by coordination has a high capacity, and the coordination with metal cobalt makes polypyrrole electrochemically active.

Embodiment 3

[0039] Add CuCl to liquid pyridine 2 , after uniform dispersion, the oxidant iron trichloride (FeCl 3 ). After fully reacting, after filtering, washing and drying, a black solid is obtained, which is the complex of Cu and pyridine.

[0040] The preparation of the working electrode of simulation battery, the assembly of battery and test method are the same as example 1, and the charge-discharge curve of simulation battery is as follows Figure 4 shown. from Figure 4 It can be seen that the complexes of Cu and pyridine formed by coordination have higher capacity, among which pyridine is electrochemically active.

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Abstract

The invention relates to an anode material for a lithium ion battery, which is a complex formed by an organic compound and a metal or metalloid material. The invention also provides a preparation method of the anode material, comprising the steps of: uniformly mixing the metal or metalloid material and the organic compound under an atmospheric pressure within a temperature range of 0-25 DEG C andadding an oxidizing agent to obtain the required complex of the organic compound and the metal or metalloid material. According to the invention, the complex compound can be directly used as the anode material of a lithium ion battery and can be also mixed with other lithium storing materials in a proportion of 1-99 wt%; the anode material has very high lithium storing capacity and good circulating performance without being subjected to a plurality of circulations, can improve the electrical contact and adhering performances among electrode material particles as well as between an electrode material and a current collector, can effectively restrain the volume change of the electrode material in a charge-discharge process, can slow down the capacity attenuation of the electrode material, and can prolong the circulating life of the constituted battery.

Description

technical field [0001] The invention belongs to the technical field of high-energy batteries. Specifically, the invention relates to a negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] It has been found that transition metal oxides such as cupric oxide and cuprous oxide (CuO, Cu 2 O), cobalt oxide (CoO, Co 3 o 4 ), iron oxide (Fe 2 o 3 ), nickel oxide (NiO), ruthenium oxide (RuO 2 ), and some simple substances that can form alloys with lithium, such as silicon (Si), tin (Sn), antimony (Sb), etc., can store lithium reversibly and have a high specific capacity. It has also been found that sulfides, nitrides, phosphides or fluorides of these transition metals also have considerable lithium storage capacity, such as cobalt sulfide (CoS 0.89 ), titanium fluoride (TiF 3 ), vanadium fluoride (VF 3 ), iron sulfide (FeS), cobalt phosphide (CoP 3 ), iron phosphide (FeP 2 ), zinc nitride (Zn 3 N 2 ), copper...

Claims

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Application Information

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IPC IPC(8): H01M4/60C07F15/02C07F15/06C07F1/08C07F17/02C07F3/06H01M4/36H01M4/139
CPCY02E60/10
Inventor 毛亚郭炳焜王兆翔陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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