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Pre-lithiation method of silicon monoxide negative electrode material

A negative electrode material, silicon oxide technology, applied in the direction of battery electrodes, lithium batteries, structural parts, etc., can solve the problems of long reaction time, hindered lithium migration, difficult industrialization promotion, etc., to reduce production costs and improve pre-lithiation The effect of speed and ease of industrialization

Pending Publication Date: 2022-05-13
DEZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can effectively improve the first Coulombic efficiency of SiO materials, since the pre-lithiation process is mostly a solid-state reaction, and SiO is a micron particle, the migration of lithium is hindered, so the required reaction time is longer (usually dozens of hours), it is difficult to promote industrialization

Method used

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  • Pre-lithiation method of silicon monoxide negative electrode material
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  • Pre-lithiation method of silicon monoxide negative electrode material

Examples

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Effect test

Embodiment 1

[0022] A method for pre-lithiation of silicon oxide negative electrode material, comprising the following steps

[0023] (1) Pre-lithiation: Crushing, pulverizing, and grinding the silicon dioxide and elemental silicon so that the diameter of the silicon dioxide and elemental silicon particles is 80 nanometers, and the nano-scale silicon dioxide and elemental silicon are mixed at a ratio of 90:10 The molar ratio is mixed evenly and pressed into a tube furnace, and the heating system of the tube furnace is turned on. The high temperature zone 1 is heated to 1200 °C at 8 °C / min, and the low temperature area 2 is heated to 400 °C at 4 °C / min. The inlet valve of lithium vapor 3 in the low temperature zone 2 of the tube furnace was maintained for 4 minutes, and then the vacuum system 4 of the tube furnace was opened to maintain the vacuum at -0.09MPa. The material SiO@Li particles were collected in the storage tank outside the tube furnace, and the lithium process as attached figu...

Embodiment 2

[0030] A method for pre-lithiation of silicon oxide negative electrode material, comprising the following steps

[0031] (1) Pre-lithiation: Crushing, pulverizing, and grinding the silicon dioxide and elemental silicon so that the diameter of the silicon dioxide and elemental silicon particles is 90 nanometers, and the nano-scale silicon dioxide and elemental silicon are mixed at an ratio of 80:20 The molar ratio is mixed evenly and pressed into a tube furnace, and the tube furnace heating system is turned on. The high temperature zone 1 is heated at 10°C / min to 1500°C, and the low temperature zone 2 is heated at 5°C / min to 600°C. In between, open the inlet valve of lithium vapor 3 in the low temperature zone of the tube furnace and maintain it for 5 minutes, then turn on the vacuum system 4 of the tube furnace to maintain the vacuum at -0.08MPa, and collect the material SiO@Li particles in the storage tank outside the tube furnace , the pre-lithiation process is as attached ...

Embodiment 3

[0038]A method for pre-lithiation of silicon oxide negative electrode material, comprising the following steps

[0039] (1) Pre-lithiation: Crushing, pulverizing, and grinding the silicon dioxide and elemental silicon so that the diameter of the silicon dioxide and elemental silicon particles is 100 nanometers. The molar ratio is mixed evenly and pressed into a tube furnace, and the heating system of the tube furnace is turned on. The high temperature zone 1 is heated at 12°C / min to 1800°C, and the low temperature zone 2 is heated at 6°C / min to 800°C. In between, open the inlet valve of lithium vapor 3 in the low temperature zone of the tube furnace and maintain it for 6 minutes, then turn on the vacuum system 4 of the tube furnace to maintain the vacuum at -0.07MPa, and collect the material SiO@Li particles in the storage tank outside the tube furnace , the pre-lithiation process is as attached figure 1 shown;

[0040] (2) Disproportionation / carbon coating: mix the material...

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Abstract

The invention relates to a pre-lithiation method of a silicon monoxide negative electrode material, which comprises the following steps: (1) pre-lithiation: carrying out crushing, crushing and grinding treatment on silicon dioxide and monatomic silicon to enable the particle diameters of the silicon dioxide and monatomic silicon to be 80-100 nanometers, and then carrying out drying to obtain a pre-lithiation product; the preparation method comprises the following steps: uniformly mixing nanoscale silicon dioxide and monatomic silicon according to a molar ratio of 90: 10-10: 90, carrying out compression molding, and then loading into a tubular furnace; (2) disproportionation / carbon coating; and (3) electrochemical testing: preparing slurry from the pre-lithiated SiO negative electrode material, polyvinylidene fluoride and acetylene black according to a mass ratio of 80: 10: 10-70: 15: 15 in NMP (N-Methyl Pyrrolidone). The metal lithium is introduced in the preparation process of the silicon monoxide, the silicon monoxide can be generated by monatomic silicon and silicon dioxide in a high-temperature area under the vacuumizing condition, the pre-lithiation speed is greatly increased, then the production efficiency is improved, the production cost is reduced, and industrialization is easy.

Description

technical field [0001] The invention belongs to the technical field of SiOx pre-lithiation, and in particular relates to a method for pre-lithiation of a silicon oxide negative electrode material. Background technique [0002] Pre-lithiation of SiOx can pre-intercalate a small amount of lithium before the official charge-discharge cycle of the electrode to increase the additional lithium source, supplement the lithium consumption of the positive electrode due to side reactions and SEI film formation, improve the first Coulombic efficiency, and then increase the energy density of the battery . To this end, researchers have developed a series of SiO pre-lithium methods. Literature (Improvement of irreversible behavior of SiO anodes for lithium ion batteries by a solid state reaction at high temperature [J]. Journal of Power Sources, 2016, 311, 159-166) by calcining SiO and metal Li powder at 600 ℃ to combine silicon oxide The first Coulombic efficiency of the negative electr...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M10/052
CPCH01M4/364H01M4/48H01M4/382H01M10/052
Inventor 唐其伟王丽
Owner DEZHOU UNIV
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