Anode active material, preparation method therefor, and anode and lithium secondary battery, which include anode active material
A negative electrode active material and secondary battery technology, applied in secondary batteries, active material electrodes, negative electrodes, etc., can solve problems such as low initial efficiency and inability to increase silicon particles, and achieve improved life characteristics, improved initial efficiency and Life characteristics, effects of preventing side reactions
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0048] Preparation method of negative electrode active material
[0049] Next, a method for preparing the anode active material according to the present invention will be described.
[0050] Specifically, according to the preparation method of the negative electrode active material of the present invention, the negative electrode active material is prepared by performing the following steps: SiO x (0≤x≤2) is mixed with at least one element selected from lithium (Li), magnesium (Mg), calcium (Ca) and aluminum (Al), and a first heat treatment is performed to set the metal compound In SiO x (0≤x≤2) on the surface or set on SiO x (0≤x≤2) on the surface and inside; the SiO that will undergo the first heat treatment x (0≤x≤2) immersed in the corrosion solution to x Pores are formed in (0≤x≤2); the SiO with pores formed therein x (0≤x≤2) is mixed with a polymer, and a second heat treatment is performed to form a silicon-based composite material by disposing the polymer in pore...
Embodiment approach
[0104] Hereinafter, the present invention will be described in detail based on specific examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these exemplary embodiments are provided so that this description will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Embodiment 1
[0107] The average particle size (D 50 ) SiO with 6 μm and magnesium (Mg) powder were mixed at a ratio of 10:1, and the mixture was heat-treated at 950°C for 2 hours to prepare a material containing MgSiO 3 and Mg 2 SiO 4 Represents the SiO particles of the metal compound. In this case, the metal compound was contained in an amount of 8% by weight based on the total weight of the SiO particles.
[0108] Subsequently, the MgSiO will contain 3 and Mg 2 SiO 4 The SiO particles were immersed in 1M NaOH solution for 3 h to 3 and Mg 2 SiO 4 Pores are formed in the SiO particles. After forming the pores, in order to determine the inclusion of MgSiO 3 and Mg 2 SiO 4 Average pore size of SiO particles in , cut using a focused ion beam (FIB) and photographed using a scanning electron microscope in which pores are formed and contain MgSiO 3 and Mg 2 SiO 4 cross-sectional images of SiO particles, and confirmed that the average pore size is 300 nm, as figure 2 shown in . ...
PUM
| Property | Measurement | Unit |
|---|---|---|
| diameter | aaaaa | aaaaa |
| particle size | aaaaa | aaaaa |
| specific surface area | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More