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Negative electrode material for lithium battery production and preparation method of negative electrode material

A negative electrode material, lithium battery technology, applied in battery electrodes, negative electrodes, nanotechnology for materials and surface science, etc., can solve the problems of low gram capacity, easy peeling off of layered structure, etc., to improve rate performance, The effect of suppressing erosion damage and reducing the probability of damage

Inactive Publication Date: 2019-11-22
徐州硕祥信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a negative electrode material for lithium battery production and its preparation method, which solves the problem of commonly used carbon negative electrode materials; the layered structure is easy to peel off when the gram capacity is low and the number of cycles is large; silicon is used as the lithium battery negative electrode when charging. The ions are extracted from the positive electrode material and embedded in the inner lattice of the silicon crystal, causing a large expansion and forming a silicon-lithium alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A negative electrode material for lithium battery production, comprising the following raw materials in parts by weight:

[0028] 40 parts of silane; 40 parts of polyvinyl alcohol; 5 parts of conductive agent; 10 parts of adhesive.

[0029] Silane is prepared by mixing monosilane SiH4 and disilane Si2H6 at a weight ratio of 2:1. The conductive agent is acetylene powder. The binder is a PAA binder; it is used to form a SEI-like coating on the Si surface and inhibit electrolyte decomposition.

[0030] The preparation method of negative electrode material for lithium battery production comprises the following specific steps:

[0031] S1. Introduce silane into the plasma generator, and re-nucleate to obtain nano-silicon particles through ionization and decomposition;

[0032] S2. After the nano-silicon particles are separated from the gas-solid and cooled, the nano-silicon powder is obtained; take it out for use;

[0033] S3. Put the nano-silicon powder into a sealed co...

Embodiment 2

[0039] A negative electrode material for lithium battery production, comprising the following raw materials in parts by weight:

[0040] 60 parts of silane; 60 parts of polyvinyl alcohol; 5 parts of conductive agent; 15 parts of adhesive.

[0041] In this embodiment, the silane is prepared by mixing monosilane SiH4 and disilane Si2H6 at a weight ratio of 2:1. The conductive agent is acetylene powder. The binder is a PAA binder; it is used to form a SEI-like coating on the Si surface and inhibit electrolyte decomposition.

[0042] The preparation method of negative electrode material for lithium battery production comprises the following specific steps:

[0043] S1. Introduce silane into the plasma generator, and re-nucleate to obtain nano-silicon particles through ionization and decomposition;

[0044] S2. After the nano-silicon particles are separated from the gas-solid and cooled, the nano-silicon powder is obtained; take it out for use;

[0045] S3. Put the nano-silicon...

Embodiment 3

[0051] A negative electrode material for lithium battery production, comprising the following raw materials in parts by weight:

[0052] 50 parts of silane; 50 parts of polyvinyl alcohol; 4 parts of conductive agent; 15 parts of adhesive.

[0053] In this embodiment, the silane is prepared by mixing monosilane SiH4 and disilane Si2H6 at a weight ratio of 2:1. The conductive agent is acetylene powder. The binder is a PAA binder; it is used to form a SEI-like coating on the Si surface and inhibit electrolyte decomposition.

[0054] The preparation method of negative electrode material for lithium battery production comprises the following specific steps:

[0055] S1. Introduce silane into the plasma generator, and re-nucleate to obtain nano-silicon particles through ionization and decomposition;

[0056] S2. After the nano-silicon particles are separated from the gas-solid and cooled, the nano-silicon powder is obtained; take it out for use;

[0057]S3. Put the nano-silicon ...

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Abstract

The invention belongs to the technical field of lithium battery production, and particularly relates to a negative electrode material for lithium battery production and a preparation method of the negative electrode material. The objective of the invention is to solve problems that for the existing carbon negative electrode material, the gram volume is low, and the layered structure is easy to peel off and easily falls off when the cycle index is high; when silicon is used as the negative electrode of the lithium battery, lithium ions are separated from the positive electrode material and embedded into crystal lattices in silicon crystals during charging, so that great expansion is caused; and in the discharging process, lithium ions are separated from lattices, and a large gap is formed.Thus, the negative electrode material comprises the following materials in parts by weight: 40 to 60 parts of silane; 40 to 60 parts of polyvinyl alcohol; 3-5 parts of a conductive agent; and 10 to 15parts of an adhesive; compared with a silicon-carbon material with a walnut structure, the silicon-carbon material with the coating structure contains more silicon, so that the lithium embedding space is greatly improved; and the phenomena of expansion and crushing of the silicon particles are also greatly reduced. Nano-silicon is coated through silicon dioxide and then is co-heated with polyvinyl alcohol to generate a carbon-silicon composite material shell film, so that the structural change of the composite material is effectively relieved, and the cycle life of the lithium battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium battery production, in particular to a negative electrode material for lithium battery production and a preparation method thereof. Background technique [0002] There are many kinds of negative electrode materials for lithium batteries, and the negative electrode of the battery refers to the end with a lower potential (potential) in the power supply. In a primary battery, it refers to the electrode that oxidizes, and it is written on the left in the battery reaction. From a physical point of view, it is a pole from which electrons flow out of the circuit. The negative electrode material refers to the raw material that constitutes the negative electrode in the battery. At present, the common negative electrode materials include carbon negative electrode materials, tin-based negative electrode materials, lithium-containing transition metal nitride negative electrode materials, alloy negative elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/1395H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/1395H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 于祥波
Owner 徐州硕祥信息科技有限公司
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