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Silicon-based lithium storage material and preparation method thereof

A silicon-based storage and lithium storage technology, applied in the field of lithium-ion batteries, can solve the problems of difficulty in forming silicon-based lithium storage materials, poor first coulomb efficiency and poor cycle characteristics of silicon-based lithium storage materials, and achieves improved initial charge and discharge coulombs. Efficiency, improvement of characteristics, effect of improving cycle characteristics

Pending Publication Date: 2020-05-12
SHANGHAI SHANSHAN TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology of using silicon oxide to prepare negative electrode materials for lithium batteries is mostly through the use of silicon particles Si and silicon oxide SiO 2 The raw material obtained under high-temperature vacuum conditions, the first coulombic efficiency of the silicon-based lithium storage material obtained by the method is poor, and the cycle characteristics are also poor, and the method is difficult to form doping elements including uniform doping (such as sulfur, phosphorus, etc.) etc.) silicon-based lithium storage materials

Method used

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  • Silicon-based lithium storage material and preparation method thereof
  • Silicon-based lithium storage material and preparation method thereof

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preparation example Construction

[0047] The present application also provides a method for preparing a silicon-based lithium storage material, including:

[0048] Step S1: providing a first mixture, the first mixture includes at least the elemental state of silicon and the +4 oxidation state of silicon, the first mixture includes a doping element R, and the doping element R includes at least I, One of the elements of the main group II, III, and where C R is the mole number of doping element R, is the number of moles of silicon elements with a valence between 0 and 4;

[0049] In the embodiment of the present application, the single state of silicon is, for example, polysilicon. The +4 oxidation state of silicon is, for example, silicon dioxide, and the raw material containing silicon dioxide is, for example, quartz, optionally, for example, β-type quartz. The +4 oxidation state of silicon can also be a silicate, for example, the general formula is MySiO 3 Compounds, where 1≤y≤2; M is I, II, III main gr...

Embodiment 1

[0077] A first mixture was prepared comprising Component A (polysilicon), Component B (beta-type quartz), and Component C (MgCO 3 ), the doping element R is based on the Mg element in component C, and the molar ratio of component B to component A (marked as Si(+4) / Si(0), representing +4 valence in component B The molar ratio of silicon to 0-valent silicon in component A) is 5:3, and the molar ratio of the Mg element in component C to the Si element in component A and component B is 0.5;

[0078] Under the protection of argon, the first mixture was heated to 2600°C in a molten state and then cooled to room temperature at a cooling rate of 20°C / S (the first mixture in the molten state was poured on a fast roller, passed through the roller The centrifugation of the first mixture in the molten state is separated from the roller to obtain a flaky cooling product), and then the flaky cooling product is pulverized to form a powder with a median diameter of 4 D, Then a 300 nm amorp...

Embodiment 2～ Embodiment 11

[0080] The specific process description refers to Example 1, and the specific process data and the performance parameters of the formed silicon-based lithium storage material are shown in Table 1.

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Abstract

The present application provides a novel silicon-based lithium storage material and a method for manufacturing the same, the silicon-based lithium storage material comprising: a first component comprising Si having a valence of 1 to 4 and a molar number of Si (0) having a valence of 0, and a second component comprising Si having a valence of 0 and a molar number of Si element having a valence of 1to 4; the second component comprises a doping element R, the doping element R at least comprises one of main group elements I, II and III, and CR is the mole number of the doping element R and is themole number of a silicon element with the valence of 0-4. The silicon-based lithium storage material improves the characteristics of the silicon-based lithium storage material as an active substanceof a lithium ion secondary battery under a high-temperature storage condition, and improves the cycle characteristics and initial charge-discharge coulombic efficiency of the battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a silicon-based lithium storage material and a preparation method thereof. Background technique [0002] In recent years, people have put forward higher requirements for the energy density of lithium-ion batteries, thus requiring higher-capacity anode materials. At present, silicon-oxygen negative electrodes have begun to be used in power batteries, and are showing a rapid growth trend. The existing technology of using silicon oxide to prepare negative electrode materials for lithium batteries is mostly through the use of silicon particles Si and silicon oxide SiO 2 The raw material obtained under high-temperature vacuum conditions, the first coulombic efficiency of the silicon-based lithium storage material obtained by the method is poor, and the cycle characteristics are also poor, and the method is difficult to form doping elements including uniform doping (such as sulfur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/36H01M4/62H01M10/0525
CPCH01M4/386H01M4/362H01M4/366H01M4/625H01M10/0525Y02E60/10C01B33/021H01M10/052C01P2004/80C01P2006/40
Inventor 马飞吴玉虎吴志红丁晓阳李凤凤
Owner SHANGHAI SHANSHAN TECH CO LTD
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