Tin-antimony oxide composite material, preparation method thereof and application of tin-antimony oxide composite material in preparation of battery negative electrode
A technology of composite materials and oxides, which is applied in the direction of battery electrodes, secondary batteries, dry solid materials, etc., can solve the problems of large volume change, fragile structure, poor conductivity, etc., to maintain structural stability, overcome poor conductivity, The effect of enhancing electrochemical activity
Pending Publication Date: 2022-07-29
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology
[0004] Aiming at the problems that the alloy-type negative electrode materials in the prior art have large volume changes during the cycle, easily damaged structures, and poor electrical conductivity, the purpose of the present invention is to provide a tin-antimony oxide composite material and its preparation method and its preparation method. For the application on the negative electrode of the battery, tin antimony oxide and carbon form a porous coating structure, which is used for the diffusion and migration of sodium ions, and at the same time reserves space for the volume expansion of the material during the sodium intercalation process, and maintains the structural stability of the electrode. It was once proposed to replace metal tin and antimony with metal oxide and porous carbon for research in a composite system to give full play to the advantages of the two and overcome the problems existing in the two
Method used
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Embodiment 1
[0042] 0.3g of glucose and 0.3g of polyvinylpyrrolidone were dissolved in 10ml of deionized water, fully stirred and dissolved, and 0.132g of stannous oxide was added. After stirring, ultrasonication was performed for 20 minutes. , and vacuum drying was carried out for 60 hours after freezing. After the vacuum drying treatment, the sample was carbonized, and the sample was placed in a tube furnace with argon-hydrogen mixed gas (5% hydrogen volume fraction), the heating rate was controlled at 5 °C / min, and the temperature was kept at 500 °C. After 3 hours, the temperature was naturally cooled to room temperature. After cooling to room temperature, the obtained solid powder was taken out to obtain the target product C-SnO.
Embodiment 2
[0044] Except replacing 0.132g of tin oxide with 0.442g of tin antimony oxide, the rest are carried out in Example 1 to obtain the target product C-Sb 2 SnO 5 .
Embodiment 3
[0046] Example 1 was followed except that 0.132 g of stannous oxide was replaced with 0.132 g of diammonium hydrogen phosphate and 0.132 g of stannous oxide. The target product C-SnO@N was obtained 2 / P.
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The invention discloses a tin-antimony oxide composite material, a preparation method thereof and application of the tin-antimony oxide composite material in preparation of a battery negative electrode. A porous carbon coated composite structure is constructed by utilizing a freeze drying or electrostatic spinning method; porous carbon in the composite system can improve the conductivity of the material, can promote the effective contact surface of an electrolyte and an active material, can shorten the transportation distance of sodium ions in the active material, and buffers the volume expansion and shrinkage of tin antimony oxide in the sodium embedding and removing process. The composite material prepared by the method shows good specific capacity and cycling stability when being used as a sodium ion battery negative electrode, the specific capacity can reach 575mAh g <-1 >, and the capacity retention rate of the first 40 circles reaches 99%.
Description
technical field [0001] The invention belongs to the preparation and application of a tin-antimony oxide@porous carbon negative electrode active material, and in particular relates to a tin-antimony oxide composite material and a preparation method thereof and its application in preparing a battery negative electrode. Background technique [0002] In the carbon peak and carbon neutral era, the battery industry needs to develop a new generation of sodium-ion batteries urgently to achieve rapid development, low-carbon interconnection of energy and comprehensive transportation electrification of electric vehicles, electric ships and aircraft. At present, the anode materials of sodium-ion batteries are mainly concentrated in hard carbon materials, but the theoretical capacity is limited to 300mAhg -1 In order to overcome the shortcomings of hard carbon materials, the need for new, low-cost battery anode materials has become the primary task for the development of sodium-ion batte...
Claims
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IPC IPC(8): H01M4/48H01M4/62H01M10/054D01F1/10D01F9/21F26B5/06
CPCH01M4/366H01M4/483H01M4/625H01M10/054D01F9/21D01F1/10F26B5/06
Inventor谌潇靖丁旭丽张宁
OwnerJIANGSU UNIV OF SCI & TECH