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Lithium ion battery and method for preparing negative electrode active material of lithium ion battery

A negative electrode active material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle stability, large volume change, easy powdering of particles, etc., to achieve high safety, high purity, The effect of reducing lattice stress

Active Publication Date: 2018-01-23
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy density of existing lithium-ion single batteries is about 100-150Wh / kg, and the energy density of battery modules is generally less than 100Wh / kg. Therefore, people in the industry have been working hard to improve the energy density of lithium-ion batteries
[0003] At present, the negative electrode active material of commercialized lithium-ion batteries is mainly graphite material, but when graphite realizes the storage and release of electric energy through the reversible intercalation / deintercalation of lithium ions between its layers, every 6 carbon atoms can only combine one lithium ion, so Its specific capacity is low, the theoretical specific capacity is only 372mAh / g
On the other hand, transition metal oxides such as Fe 2 o 3 、Co 3 o 4 、CoMn 2 o 4 、ZnCo 2 o 4 etc., because it can transform and lose multiple electrons, it has a high theoretical specific capacity, among which, FeO z (1≤z≤1.5) The specific capacity can be as high as 1000mAh / g, and the raw materials used are cheap and easy to get; poor

Method used

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  • Lithium ion battery and method for preparing negative electrode active material of lithium ion battery
  • Lithium ion battery and method for preparing negative electrode active material of lithium ion battery
  • Lithium ion battery and method for preparing negative electrode active material of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0040] Preparation of negative electrode active materials for lithium-ion batteries:

[0041] 1) FeCl 3 Dissolve in water to obtain a reddish-brown solution with a concentration of 0.001M;

[0042] 2) Set the specific surface area to 1100m 2 g -1 The carbon black XC-72 produced by Cabot Company of the United States is ultrasonically dispersed in the solution to obtain a suspension, and the ultrasonic dispersion time is 1h. XC-72 and FeCl 3 The molar ratio is 0.18:1;

[0043] 3) Add an ethanol solution of tetraethylsilane to the suspension obtained in step 2), wherein the volume ratio of tetraethylsilane to ethanol is 1:1, tetraethylsilane and FeCl 3 The molar ratio is 1:2 / 3;

[0044] 4) With a constant stirring speed of 500 rpm and a constant temperature of 10°C, add tetrahydrofuran dropwise until the pH value of the reaction system reaches 8.0, and control the change rate of the pH value of the reaction system over time ΔpH / min to 0.01 to obtain a precipitate ;

[0045...

Embodiment 2

[0052] Preparation of negative electrode active materials for lithium-ion batteries:

[0053] 1) Fe(NO 3 ) 3 Dissolve in water to obtain a reddish-brown solution with a concentration of 0.01M;

[0054] 2) Set the specific surface area to 1500m 2 g -1 The carbon black Black Pearl 2000 produced by American Cabot Company was ultrasonically dispersed in the solution to obtain a suspension, and the ultrasonic dispersion time was 1h. Black Pearl 2000 and Fe(NO 3 ) 3 The molar ratio is 6.29:1;

[0055] 3) Add the ethanol solution of tetrabutyl silicate to the suspension obtained in step 2), wherein the volume ratio of tetrabutyl silicate to ethanol is 30:1, tetraethylsilane and Fe(NO 3 ) 3 The molar ratio is 1:2;

[0056] 4) Constant stirring speed is 20 rev / min, constant temperature is 20 DEG C, add ethylene oxide drop by drop until the pH value of the reaction system reaches 12.0, control the change rate of the pH value of the reaction system over time ΔpH / min is 2, get se...

Embodiment 3

[0061] Preparation of negative electrode active materials for lithium-ion batteries:

[0062] 1) Fe 2 (SO 4 ) 3 Dissolve in water to obtain a reddish-brown solution with a concentration of 3.0M;

[0063] 2) Ultrasonic dispersion of glucose in the solution to obtain a suspension, the ultrasonic dispersion time is 3min, glucose and Fe 2 (SO 4 ) 3 The molar ratio is 0.36:1;

[0064] 3) Add an ethanol solution of tetrapropyl silicate to the suspension obtained in step 2), wherein the volume ratio of tetrapropyl silicate to ethanol is 10:1, tetraethylsilane and Fe 2 (SO 4 ) 3 The molar ratio is 1:4 / 3;

[0065] 4) A constant stirring speed of 100 rpm, a constant temperature of 40°C, adding epichlorohydrin drop by drop until the pH value of the reaction system reaches 10.0, and controlling the change rate ΔpH / min of the pH value of the reaction system over time to 4, get sediment;

[0066] 5) After the precipitate obtained in step 4) was allowed to stand for 24 hours, it w...

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Abstract

The invention discloses a negative active material for a lithium-ion battery. A chemical formula of the negative active material is FexSiOy / C, wherein x is smaller than or equal to 2 and greater than or equal to 2 / 3; and y is smaller than or equal to 4 and greater than or equal to 3. In addition, the invention further discloses a preparation method of the negative active material for the lithium-ion battery and the lithium-ion battery employing the negative active material. Compared with the prior art, the negative active material FexSiOy / C for the lithium-ion battery disclosed by invention has the advantages of high specific capacity, high cycling stability, low cost and the like; the preparation method is simple, convenient and feasible; the prepared FexSiOy / C is high in purity and excellent in electrochemical property; and the lithium-ion battery has the advantages of high energy density, long service lifetime, high safety and the like.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically, the invention relates to a lithium ion battery negative electrode active material and a preparation method thereof. Background technique [0002] The energy density of a battery is an important performance indicator that affects its application. For example, the development goals of lithium-ion power batteries formulated by the U.S. Department of Energy (DOE) and the Japanese New Energy Industrial Technology Development Organization (NEDO) point out that in order to meet the needs of pure electric vehicles , The energy density of the lithium-ion power battery should be at least 200Wh / kg. However, the energy density of existing lithium-ion single batteries is about 100-150Wh / kg, and the energy density of battery modules is generally less than 100Wh / kg. Therefore, people in the industry have been working hard to increase the energy density of lithium-ion batteries. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/36H01M10/0525
CPCY02E60/10
Inventor 王福庆
Owner CONTEMPORARY AMPEREX TECH CO