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Lithium ion battery negative electrode active material and preparation thereof, lithium ion battery negative electrode material, lithium ion battery negative electrode and 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 rate performance and cycle stability decline, low initial efficiency of lithium-ion batteries, and reduced capacity of lithium-ion batteries. Achieve the effects of strong cycle stability, high initial efficiency, and high rate performance

Active Publication Date: 2016-03-30
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the volume expansion of Sn-based negative electrode materials used in lithium-ion batteries when deintercalating lithium, which causes serious reduction in lithium-ion battery capacity, low initial efficiency of lithium-ion batteries, and decline in rate performance and cycle stability, the present invention proposes A lithium ion battery negative electrode active material, the preparation method of the lithium ion battery negative electrode active material and the prepared lithium ion battery negative electrode active material, the lithium ion battery negative electrode material containing the lithium ion battery negative electrode active material, containing the lithium ion battery Lithium ion battery negative electrode of battery negative electrode material, and lithium ion battery containing the lithium ion battery negative electrode

Method used

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  • Lithium ion battery negative electrode active material and preparation thereof, lithium ion battery negative electrode material, lithium ion battery negative electrode and lithium ion battery
  • Lithium ion battery negative electrode active material and preparation thereof, lithium ion battery negative electrode material, lithium ion battery negative electrode and lithium ion battery
  • Lithium ion battery negative electrode active material and preparation thereof, lithium ion battery negative electrode material, lithium ion battery negative electrode and lithium ion battery

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preparation example Construction

[0034] According to the second aspect of the present invention, the present invention provides a kind of preparation method of described lithium-ion battery negative pole active material, and this method comprises the steps:

[0035] (1) contacting a mixed solution containing a water-soluble tin salt, a water-soluble cobalt salt and a carbon source material with an alkaline substance for a contact reaction, and obtaining a solid powder A from the obtained contact mixture;

[0036] Wherein, the carbon source material is selected from at least one of natural spherical graphite, soft carbon, and hard carbon; relative to 100 parts by weight of the carbon source material, the amount of the water-soluble tin salt is the weight of the tin element The sum of the parts by weight of parts and the consumption of water-soluble cobalt salt is 5-20 parts by weight in terms of cobalt element;

[0037] (2) performing reduction treatment on the solid powder A obtained in step (1) to obtain sol...

Embodiment 1

[0075] This example is used to illustrate the lithium ion battery negative electrode active material provided by the present invention and its preparation method, as well as the lithium ion battery containing the lithium ion battery negative electrode active material and its preparation method.

[0076] (1) Mix stannous sulfate, cobalt chloride hexahydrate, polyvinylpyrrolidone (purchased from Sinopharm Chemical Reagent Co., Ltd. with the brand name K-30) and natural spherical graphite (purchased from Qingdao Taihelong New Energy Materials Co., Ltd. A10 commodity) into deionized water, stirring constantly to mix evenly. Add the mixed solution into a stainless steel reaction kettle, heat it in a circulating water bath at 80°C, and stir at a speed of 180r / min for 0.5h;

[0077] Ammonium bicarbonate is made into the solution of 0.2g / mL with deionized water, then use metering pump (purchased from IWAKIPUMPS company trade mark to be the commodity of EHN_R type) slowly drop in the s...

Embodiment 2

[0092] Except the operating parameters in Table 1 and the following parameters, the operating method is the same as in Example 1.

[0093] In step (1), the composition of the carbon source material used is: 90% by weight of natural spherical graphite and 10% by weight of soft carbon. The alkaline substance used is sodium bicarbonate. The ratio of the weight of tin salt calculated as tin element to the weight of cobalt salt calculated as cobalt element is 1:0.5.

[0094] The obtained lithium-ion battery is denoted as S2. The performance parameters of S2 are shown in Table 2.

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Abstract

The invention discloses a lithium ion battery negative electrode active material. The negative electrode active material adopts a core-shell structure; the inner core layer of the core-shell structure adopts a carbon source material; the carbon source material is selected from at least one kind of natural spherical graphite, soft carbon and hard carbon; the shell layer of the core-shell structure comprises 1.5-8 parts of amorphous carbon, 5-20 parts of tin-cobalt alloy and 0.5-3 parts of carbon nanotube based on 100 parts of carbon source materials in parts by weight. The invention also provides a preparation method for the lithium ion battery negative electrode active material, a lithium ion battery negative material containing the negative electrode active material, a lithium ion battery negative electrode containing the negative electrode material, and a lithium ion battery containing the negative electrode. The lithium ion battery prepared from the lithium ion battery negative electrode active material with the core-shell structure provided by the invention is high in initial efficiency, specific volumetric capacity, rate capability and cycling stability.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode active material and a preparation method thereof, a lithium ion battery negative electrode material formed from the lithium ion battery negative electrode active material, a lithium ion battery negative electrode containing the lithium ion battery negative electrode material, and a lithium ion battery containing the lithium ion battery Negative lithium-ion battery. Background technique [0002] With the rapid development of portable and mobile electronic devices in today's society, the market demand for lithium-ion batteries with light weight, small size, higher capacity and energy density is increasing. The key to the successful application of lithium-ion batteries is the anode material that can reversibly intercalate and deintercalate lithium ions. Therefore, the anode material is the main component of the lithium-ion battery, and the performance of the anode material directly affects ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/134H01M4/1395H01M10/0525
CPCY02E60/10
Inventor 张开刘会权
Owner BYD CO LTD
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