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Egg-shaped dual-carbon shell layer tin-based negative electrode material of lithium ion battery and preparation method for negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as taking into account electrochemical properties, reduce migration distance and increase reaction sites point, the effect of increasing the specific capacity

Inactive Publication Date: 2017-11-21
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this material, the carbon shell accounts for 30-50wt% of the total mass of the composite material, but it is only treated as the outer cladding shell layer. Few people take their electrochemical properties into consideration, and even fewer people Considering the method of improving the electrochemical performance of this material from the perspective of carbon shell

Method used

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  • Egg-shaped dual-carbon shell layer tin-based negative electrode material of lithium ion battery and preparation method for negative electrode material
  • Egg-shaped dual-carbon shell layer tin-based negative electrode material of lithium ion battery and preparation method for negative electrode material
  • Egg-shaped dual-carbon shell layer tin-based negative electrode material of lithium ion battery and preparation method for negative electrode material

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Embodiment 1

[0035] The preparation method of a kind of egg-shaped double carbon shell layer tin-based lithium ion battery negative electrode material that the present invention proposes comprises the following steps:

[0036] S1. Dissolve tin tetrachloride in an aqueous sodium hydroxide solution with a concentration of 0.3mol / L and stir evenly to obtain solution A, wherein the molar concentration of tin ions is 0.08mol / L, and add solution A to aqueous sodium alginate solution under stirring conditions Mixed solution B was obtained, wherein the mass concentration of sodium alginate in mixed solution B was 10 mg / ml, mixed solution B was poured into the reaction kettle, heated to 180 ° C and kept for 2 hours, naturally cooled to room temperature, and centrifuged to obtain a precipitate. The precipitate was washed 4 times with absolute ethanol and deionized water respectively, and after drying under vacuum at 60°C for 10 hours, porous tin dioxide balls were obtained; a mixed solvent of ethanol...

Embodiment 2

[0040] The preparation method of a kind of egg-shaped double carbon shell layer tin-based lithium ion battery negative electrode material that the present invention proposes comprises the following steps:

[0041] S1. Dissolve tin tetrachloride in an aqueous sodium hydroxide solution with a concentration of 0.6mol / L and stir evenly to obtain solution A, wherein the molar concentration of tin ions is 0.03mol / L, and add solution A to aqueous sodium alginate solution under stirring conditions The mixed solution B was obtained in the mixed solution B, wherein the mass concentration of sodium alginate in the mixed solution B was 20mg / ml, the mixed solution B was poured into the reaction kettle, the temperature was raised to 160°C and kept for 10h, and the precipitate was obtained by centrifugal separation after natural cooling to room temperature. The precipitate was washed twice with absolute ethanol and deionized water, and dried under vacuum at 80°C for 5 hours to obtain porous t...

Embodiment 3

[0045] The preparation method of a kind of egg-shaped double carbon shell layer tin-based lithium ion battery negative electrode material that the present invention proposes comprises the following steps:

[0046] S1. Dissolve tin tetrachloride in an aqueous sodium hydroxide solution with a concentration of 0.4mol / L and stir evenly to obtain solution A, wherein the molar concentration of tin ions is 0.06mol / L, and add solution A to aqueous sodium alginate solution under stirring conditions Mixed solution B was obtained in the mixed solution B, wherein the mass concentration of sodium alginate in the mixed solution B was 15mg / ml, the mixed solution B was poured into the reaction kettle, the temperature was raised to 170°C and kept for 6h, and the precipitate was obtained by centrifugation after natural cooling to room temperature. The precipitate was washed three times with absolute ethanol and deionized water respectively, and after drying under vacuum at 70°C for 7 hours, poro...

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Abstract

The invention provides an egg-shaped dual-carbon shell layer tin-based negative electrode material of a lithium ion battery and a preparation method for the negative electrode material. The egg-shell-shaped dual-layer carbon-coated stannic oxide nanocomposite comprises a porous stannic oxide sphere kernel and a dual-layer carbon shell for coating the surface of the porous stannic oxide sphere kernel, and a hollow layer exists between the two parts; the preparation method comprises the steps of preparing the egg-shell-shaped silicon dioxide-coated porous stannic oxide sphere nanocomposite by adopting a surfactant soft template method, and then attaching an organic pyrolytic carbon raw material on the surface of the nanocomposite, and performing a hydrothermal reaction and then carrying out condensation polymerization and carbonization to obtain the egg-shell-shaped carbon-silicon dioxide-carbon-coated stannic oxide sphere nanocomposite, and finally, performing etching by adopting a sodium hydroxide alkali solution to obtain the egg-shell-shaped dual-layer carbon-coated stannic oxide nanocomposite. Finally, the invention provides the tin-based negative electrode material of the lithium ion battery with nanometer scale, high conductivity and capability of effectively suppressing the volume effect of stannic oxide, and a preparation method for the negative electrode material.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to an egg-shaped double carbon shell tin-based lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries will become the main power source for electric vehicles due to their performance advantages such as high specific energy and long-lasting stability. Chemical energy storage technologies represented by lithium-ion batteries are also being actively invested in research and development. The current commercial lithium ion battery anode material is graphite carbon material, but its theoretical capacity is only 372mAh / g; in addition, the lithium intercalation potential of this material is mainly concentrated in the range of 0-0.1V (vs.Li / Li+) , which is very close to the deposition potential of metal lithium, which is not conducive to the safety of the battery. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 万宁杨茂萍沈中宇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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