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Preparation method of silicon-oxygen-carbon type lithium ion battery negative electrode material

A technology of silicon oxygen carbon lithium and ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of high cycle stability, easy industrial preparation, and simple preparation process

Active Publication Date: 2021-01-05
SHENZHEN RES INST OF XIAMEN UNIV +1
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  • Application Information

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Problems solved by technology

Dahn et al [Wilson A M, Reimers J N, Fuller E W, et al. Lithium Insertion in Pyrolyzed Siloxane Polymers [J]. Solid State Ionics, 1994, 74 (3-4): 249-254] with methyl phenyl silicone oil and poly Using phenylsilsesquioxane as raw material, Si x o y C z Ceramics at 0~1.0V(vs.Li / Li + ) The reversible specific capacity within the voltage window is 550mAh g -1 , but the first Coulombic efficiency is only ~60%

Method used

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  • Preparation method of silicon-oxygen-carbon type lithium ion battery negative electrode material

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[0023] A preparation method of a silicon oxygen carbon type lithium ion battery negative electrode material, comprising the following steps:

[0024] 1) reacting vinyl-containing compounds with PCS in different proportions to regulate the Si-C ratio; in step 1), the vinyl-containing compounds can be selected from styrenes, divinylbenzenes, methacrylic acid One of vinyl compounds such as esters and acrylates; the specific method of reacting vinyl-containing compounds and PCS in different proportions to regulate the ratio of Si-C can be: use a Pt-containing catalyst to catalyze vinyl and Si The addition reaction of -H bond, by adjusting the feed ratio of vinyl compound and PCS, control Si x o y C z The ratio of Si and C of the ceramic; the mass ratio of the vinyl compound: PCS is 0.05-1.

[0025] 2) reacting the product of step 1) and the metal organic compound in different proportions; in step 2), the metal organic compound can be one of carbonyl metal organic compounds, ace...

Embodiment 1

[0030] 1) Grind 1.0g of PCS into powder, place it in a tube furnace, pass in air, first raise the temperature to 100°C at 5°C / min, then raise the temperature to 160°C at 10°C / h, keep it warm for 20 hours and then cool with the furnace;

[0031] 2) Put 1.0 g of the polycarbosilane obtained in step 1) in a tube furnace, raise the temperature to 1300° C. at 180° C. / h under an Ar atmosphere, keep it warm for 1 hour, and then cool it with the furnace to obtain a silicon oxygen carbon ceramic.

[0032] figure 1 The cycle performance diagram of the button-type half-cell assembled from the silicon-oxygen-carbon ceramics obtained in Example 1.

Embodiment 2

[0034] 1) React 5.0g PCS, 0.5g divinylbenzene, 100μL 10% chloroplatinic acid isopropanol solution and 100mL n-hexane under an inert atmosphere at 70°C for 24h, remove n-hexane after the reaction, and dry at 50°C under vacuum 24h to obtain divinylbenzene modified PCS.

[0035] 2) Place the product obtained in step 1) in a tube furnace, feed air, first raise the temperature to 100°C at 5°C / min, then raise the temperature to 200°C at 10°C / h, keep it warm for 3 hours and then cool with the furnace;

[0036] 3) The sample obtained in step 2) was placed in a tube furnace, and the temperature was raised to 900°C at 120°C / h under Ar atmosphere, kept for 1h, and then cooled with the furnace to obtain silicon oxygen carbon ceramics.

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Abstract

The invention discloses a preparation method of a silicon-oxygen-carbon type lithium ion battery negative electrode material, and belongs to the field of lithium ion batteries. The preparation methodcomprises the following steps: 1) reacting a vinyl-containing compound with PCS according to different proportions, and regulating the Si-C ratio; 2) reacting the product obtained in the step 1) witha metal organic compound according to different proportions; 3) oxidizing the product obtained in the step 2) in air to obtain crosslinked PCS with different oxygen contents; and 4) carrying out high-temperature pyrolysis on the cross-linked PCS with different oxygen contents obtained in the step 3) in an inert atmosphere, and carrying out furnace cooling to obtain the silicon-oxygen-carbon type lithium ion battery negative electrode material. A series of SixOyCz ceramics with different compositions and structures are prepared by modifying industrial PCS and regulating and controlling the contents of introduced C, metal and O, the influence factors of the compositions and the structures of the SixOyCz ceramics on the electrochemical performance of the SixOyCz ceramics can be systematicallyresearched, and the negative electrode material for the lithium ion battery, which is high in cycling stability and excellent in rate capability, is obtained. The process is simple, industrial preparation is easy, and the product is rich and diverse.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a method for preparing a negative electrode material of a silicon oxygen carbon type lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices and other energy storage systems, especially in electric vehicles, due to their high energy density and excellent cycle durability. However, the capacity of the cathode material of lithium-ion batteries on the market is generally 140-200mAh / g, while the theoretical capacity of the graphite anode is only 370mAh / g. Therefore, the current commercial positive and negative electrode materials cannot meet the needs of light-weight and high-capacity lithium-ion batteries, and it is urgent to design electrode active materials with better performance. [0003] Wang et al.[C.Wang.et al.Nano-and bulk-silicon-based insertion anodes forlithium-ion secondarycells.Journal of P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/571C04B35/577C04B35/622H01M4/58H01M10/0525
CPCC04B35/571C04B35/622H01M4/58H01M10/0525C04B2235/658C04B2235/6562C04B2235/6567C04B2235/441C04B2235/44Y02E60/10
Inventor 刘安华史本洋陈绍鸿郭晓鑫余兆菊
Owner SHENZHEN RES INST OF XIAMEN UNIV
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