Preparation method of high-strength lithium ion battery silicon alloy composite anode material
A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low mechanical strength and achieve the effects of excellent electrochemical performance, high mechanical elasticity, and high mechanical strength
Inactive Publication Date: 2020-12-22
WANXIANG 123 CO LTD
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Problems solved by technology
[0003] The present invention aims to overcome the problem of low mechanical strength in the prior art, and provides a method for preparing a high-strength lithium-ion battery silicon alloy composite negative electrode material
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[0032] A method for preparing a high-strength lithium-ion battery silicon alloy composite negative electrode material, comprising the following steps:
[0033] (1) Mix ferrosilicon alloy powder, silicon nanopowder, carbon material, polyacrylonitrile, pullulan gum or Glen gum and N,N-dimethylformamide to form a mixed slurry, each group in the negative electrode material The mass percentages are: ferrosilicon alloy powder 10-20%, silicon nano-powder 25-45%, carbon material (one or more of graphene, carbon black, carbon nanotube or conductive graphite) 15-25% , Polyacrylonitrile 15-25%, pullulan gum or Glen gum 5-10%, N,N-dimethylformamide 5-15%.
[0034] (2), pulverizing the mixed slurry described in step (1);
[0035] (3), the solution obtained in step (2) is ground, and the grinding beads are zirconium beads, and N,N-dimethylformamide is added during the grinding process;
[0036] (4), and then apply the slurry obtained by grinding in step (3) on the copper foil, the thickne...
Embodiment 1
[0041]
Embodiment 2
[0043]
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Abstract
The invention relates to the field of lithium ion battery materials, and discloses a preparation method of a high-strength lithium ion battery silicon alloy composite anode material in order to solvethe problem of low mechanical strength of an anode material, and the preparation method comprises the following steps: mixing alloy powder, silicon nano powder, a carbon material, polyacrylonitrile, pullulan gum and / or gellan gum to form a mixed slurry; crushing the mixed slurry; grinding the obtained mixed solution, and adding N, Ndimethylformamide in the grinding process; then coating the slurryobtained by grinding on a copper foil; drying the copper foil in vacuum; carrying out thermal decomposition treatment on the electrode plate; and annealing to cool the electrode plate to room temperature. The electrode structure prepared by adopting the method has higher mechanical strength; rapid reduction of battery performance caused by volume change of silicon can be effectively relieved; andthe graphene around the silicon particles has high mechanical elasticity, and is helpful for adapting to significant volume change.
Description
technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a method for preparing a high-strength lithium-ion battery silicon alloy composite negative electrode material. Background technique [0002] During the intercalation and extraction of lithium ions, the huge volume change of silicon particles leads to particle crushing, the electrode loses conductivity, and an unstable solid electrolyte film (SEI) is formed on the silicon surface, resulting in a rapid decline in battery capacity. The study showed that silicon is intrinsically resistant to particle breakage below a critical size of 150 nanometers, the size of particles that help maintain the integrity of the electrodes. In addition, the small particle size shortens the length of the lithium ion diffusion path and improves the rate capability. Therefore, constructing a nano-sized silicon anode with a composite structure is an important way to improve the volume expansi...
Claims
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IPC IPC(8): H01M4/1395H01M4/38H01M4/62H01M10/0525
CPCH01M4/1395H01M4/386H01M4/622H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 宫娇娇资小林许梦清高明霞
Owner WANXIANG 123 CO LTD