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Porous silicon negative electrode material

A negative electrode material, porous silicon technology, applied in battery electrodes, structural parts, secondary battery repair/maintenance, etc., can solve volume expansion and other problems, achieve the effect of improving cycle life, not easy to break, and increasing migration rate

Pending Publication Date: 2022-07-26
LANXI ZHIDE ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present application provides a porous silicon negative electrode material to solve the problem of volume expansion in the charging and discharging process when silicon material is used as the lithium battery negative electrode material

Method used

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  • Porous silicon negative electrode material
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Embodiment 1

[0022] The silicon powder and silicon dioxide powder are mixed evenly in the ratio of (1~2):1, and then put into the sublimation chamber 1, and heated at 1300~1600 ℃ for 2 hours to generate silicon oxide vapor; the potassium chloride is put into the sublimation chamber In 2, heating at 1000~1400 ℃ for 2 hours to generate potassium chloride vapor; the silicon oxide vapor and potassium chloride vapor are introduced into the condensation chamber at the same time, and argon gas preheated to 100~500 ℃ is passed into the condensation chamber at this time. , the three gases are evenly mixed in the condensing chamber, the temperature in the condensing chamber is controlled to be ≤500 °C, and the pressure in the condensing chamber is 5×10 3~4 Pa, silicon oxide vapor and potassium chloride vapor are condensed and formed in the form of small particles; the product obtained after condensation is cleaned with deionized water, the soluble potassium chloride in the condensed product is remove...

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Abstract

The invention provides a porous silicon negative electrode material which comprises a porous silicon compound, conductive carbon and a composite material, and at least one part of the surface of the porous silicon compound is coated with the conductive carbon; at least one part of the surface of the porous silicon compound or at least one part of the surface of the conductive carbon or at least one part of the porous silicon compound and the conductive carbon is coated with a composite material. The porous silicon material is used as an inner core, so that the high capacity of the negative electrode material is ensured, and pores in the porous silicon can effectively relieve the problem of volume expansion during charging and discharging; a conductive carbon material exists in pores of the porous silicon material, so that a pinning effect can be formed, and the structure is stabilized while the conductivity of the silicon negative electrode material is improved. Besides, a composite material coating layer and a composite material layer on the surface of the porous silicon material have an SEI film function, so that the migration rate of lithium ions can be effectively improved, and meanwhile, the composite material layer has certain elasticity, so that the volume expansion of an inner core can be relieved to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a porous silicon negative electrode material. Background technique [0002] Volume expansion is a problem that any lithium ion electrode material has to face in the process of delithiation and intercalation, but this problem is particularly serious for Si negative electrodes. In the state of complete lithium intercalation, the expansion of Si negative electrodes can reach 300%. This will not only cause the Si anode particles to break, but also destroy the structure of the anode pole piece, causing the anode to pulverize and fall off, resulting in an irreversible loss of battery capacity. In order to solve the above problems, the Si anode is made porous by various means, and the pores can absorb the volume expansion of the Si anode, thereby improving the cycle performance of the Si anode. SUMMARY OF THE INVENTION [0003] In view of this, the present application p...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525H01M10/42
CPCH01M4/386H01M4/366H01M4/625H01M10/0525H01M10/4235
Inventor 陈青华肖旦姚林林贺劲鑫
Owner LANXI ZHIDE ADVANCED MATERIALS CO LTD