Tin carbon nanometer compound material for lithium ion battery and method for making same

A technology of nanocomposite materials and lithium-ion batteries, applied in electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems of poor cycle performance of tin-carbon nanocomposite electrode materials, insufficient environmental protection of raw materials, complicated preparation process, etc., to achieve The effect of stable shape and structure, low cost and simple preparation process

Inactive Publication Date: 2008-06-18
GUANGXI NORMAL UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Although the tin-carbon nanocomposite material of the present invention can alleviate the serious volume effect produced by the tin-containing active material when deintercalating lithium, its preparation process is complicated, it is difficult to industrialize production, and the raw materials are not environmentally friendly enough. The obtained tin-carbon nanocomposite The cycle performance of the electrode material is also poor

Method used

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  • Tin carbon nanometer compound material for lithium ion battery and method for making same
  • Tin carbon nanometer compound material for lithium ion battery and method for making same

Examples

Experimental program
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Effect test

Embodiment 1

[0014] 1) With sodium stannate and cationic starch as initial raw materials, 7.5gNa 2 SnO 3 2H 2 O was prepared into a solution of 2 mol / L, and 5.0 g of cationic starch was added to the solution. After the resulting mixed solution was stirred evenly, it was heated while stirring until the water was evaporated to dryness, and then dried at 120° C. for 12 hours to obtain a mixture;

[0015] 2) The resulting mixture was heated to 400°C at 2°C / min in a flowing argon atmosphere (the flow rate of argon was 300ml / min) and kept at 400°C for 4 hours, then raised to 600°C at the same rate and kept for 4 hours, Then wait for it to cool naturally to room temperature, the obtained product is first washed with 5wt% hydrochloric acid to remove the sodium salt therein, and then washed to neutrality with distilled water, and the washed product is dried and ground through a 300-mesh sieve to obtain the lithium-ion battery negative electrode The tin-carbon nanocomposite material is used, its X...

Embodiment 2

[0018] 1) With tin chloride and cornstarch as initial raw materials, 5.6gSnCl 4 ·5H 2 O was prepared into a solution of 2 mol / L, and 5.0 g of cornstarch was added to the solution. After the resulting mixed solution was stirred evenly, it was heated while stirring until the water was evaporated to dryness, and then dried at 150° C. for 12 hours to obtain a mixture;

[0019] 2) In a flowing argon atmosphere (the flow rate of argon is 300ml / min), the resulting mixture was heated to 400°C at 2°C / min and kept for 4 hours, and then heated to 800°C at the same rate and kept for 10 hours. Then wait for it to cool naturally to room temperature, and grind the obtained product through a 300-mesh sieve to obtain the tin-carbon nanocomposite material for the negative electrode of the lithium ion battery.

[0020] The above-mentioned lithium-ion battery negative electrode is made of tin-carbon nanocomposite material plus 10wt% conductive agent acetylene black, 10wt% binder PVDF to make a s...

Embodiment 3

[0022] 1) take tin protochloride and tapioca starch as initial raw material, in 6.8gSnCl 2 2H 2 O and 5.0g of tapioca starch were mixed with 20ml of ethanol, ball milled at a rate of 500 rpm for 14 hours, then dried at 120°C for 6 hours to obtain the mixture;

[0023] 2) The resulting mixture is heated up to 400°C at 2°C / min in a flowing argon atmosphere (the flow rate of argon is 2000ml / min) and kept at a temperature of 4 hours, then heated to 1000°C at the same rate, and then allowed to cool naturally After reaching room temperature, the obtained product is ground and passed through a 300-mesh sieve to obtain the tin-carbon nanocomposite material for lithium-ion battery negative electrodes.

[0024] The above-mentioned lithium-ion battery negative electrode is made of tin-carbon nanocomposite material plus 10wt% conductive agent acetylene black, 10wt% binder PVDF to make a slurry, evenly coated on the copper foil, dried and compacted to form a round shape The pole piece is...

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Abstract

The invention discloses a tin-carbon nano-composite and a preparation method which are used for a cathode of a li-ion battery. The steps of the preparation method are as follows: 1) dissoluble stannate or dissoluble tin salt is mixed uniformly with starch in order to obtain admixture; the mass ratio of starch and tin in the dissoluble stannate or tin in the dissoluble tin salt is 1:0.01 to 0.5; 2) the obtained admixture is arranged in inertia gas environment, heated to the temperature of 300 DEG C to 400 DEG C which is kept for 0-10 hours, and then heated to the temperature of 500 DEG C to 1000 DEG C which is kept for 0-10 hours and then cooled to obtain the tin-carbon nano-composite used for the cathode of the li-ion battery. The preparation method of the invention has simple process, low cost, high specific capacity and excellent circulation performance of obtained tin-carbon nano-composite.

Description

(1) Technical field: [0001] The invention relates to a material for the negative pole of lithium ion batteries, in particular to a tin-carbon nanocomposite material for the negative pole of the lithium ion battery; the invention also relates to a preparation method for the tin carbon nanocomposite material for the negative pole of the lithium ion battery. (two) background technology: [0002] With the miniaturization of various portable electronic devices and the development of electric vehicles' demand for large-capacity and high-power chemical power sources, although the negative electrodes of commercialized lithium-ion batteries have excellent cycle performance, due to their low storage capacity, they are far from It is far from meeting the needs of large capacity, high power and miniaturization. At present, many studies on seeking new high-capacity anode materials are very active, among which metal tin has attracted widespread attention because of its high lithium interc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04B01J19/00H01M4/36H01M4/139
CPCY02E60/10
Inventor 王红强李庆余颜志雄张安娜陈美超
Owner GUANGXI NORMAL UNIV
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