Method for preparing cathode of lithium ion battery with lithium-silicon film through pulse electrodeposition

A lithium-ion battery, pulse electrodeposition technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor conductivity, difficult to thicken silicon films, etc., to improve quality, eliminate concentration polarization, and tightly bonded Effect

Inactive Publication Date: 2014-09-24
盐城市新能源化学储能与动力电源研究中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the poor electrical conductivity of silicon, it is difficult to thicken the silicon film during the electrodeposition process. The above-mentioned literature uses a deposition substrate w

Method used

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  • Method for preparing cathode of lithium ion battery with lithium-silicon film through pulse electrodeposition
  • Method for preparing cathode of lithium ion battery with lithium-silicon film through pulse electrodeposition
  • Method for preparing cathode of lithium ion battery with lithium-silicon film through pulse electrodeposition

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Effect test

Embodiment 1

[0036] A method for preparing lithium-silicon thin-film lithium-ion battery negative electrodes by pulse electrodeposition, the preparation process comprising the following process steps:

[0037] 1. Electrolyte Preparation

[0038] Under the protection of argon, lithium perchlorate and silicon tetrachloride were added to the propylene carbonate solvent, stirred and dissolved to obtain an electrolyte, and the molar concentration of silicon tetrachloride in the electrolyte was 0.5mol L -1 , the molar concentration of lithium perchlorate is 0.6mol L -1 ;

[0039] 2. Pulse Electrodeposition

[0040] Place the above electrolytic solution in a three-chamber electrolytic cell with a constant temperature jacket at a constant temperature of 30°C, and conduct co-electrodeposition of lithium and silicon under the protection of argon: the platinum sheet is the anode, the platinum wire is the quasi-reference electrode, and the cathode is the Copper net collector, 100 mesh; electrodepos...

Embodiment 2

[0044] A method for preparing lithium-silicon thin-film lithium-ion battery negative electrodes by pulse electrodeposition, the preparation process comprising the following process steps:

[0045] 1. Electrolyte Preparation

[0046] Under the protection of argon, lithium perchlorate and silicon tetrachloride were added to the propylene carbonate solvent, stirred and dissolved to obtain an electrolyte, and the molar concentration of silicon tetrachloride in the electrolyte was 0.5mol L -1 , the molar concentration of lithium perchlorate is 0.6mol L -1 ;

[0047] 2. Pulse Electrodeposition

[0048] Place the above electrolytic solution in a three-chamber electrolytic cell with a constant temperature jacket at a constant temperature of 30°C, and conduct co-electrodeposition of lithium and silicon under the protection of argon: the platinum sheet is the anode, the platinum wire is the quasi-reference electrode, and the cathode is the Copper foil current collector with a thickne...

Embodiment 3

[0051] A method for preparing lithium-silicon thin-film lithium-ion battery negative electrodes by pulse electrodeposition, the preparation process comprising the following process steps:

[0052] 1. Electrolyte Preparation

[0053] Under the protection of nitrogen, add lithium dioxalate borate and silicon tetrachloride into the dichloromethane solvent, stir and dissolve to obtain an electrolyte, and the molar concentration of silicon tetrachloride in the electrolyte is 0.4mol L -1 , the molar concentration of lithium dioxalate borate is 0.3mol L -1 ;

[0054] 2. Pulse Electrodeposition

[0055] Place the above electrolyte in a three-chamber electrolytic cell with a constant temperature jacket, at a constant temperature of 25°C, and conduct co-electrodeposition of lithium and silicon under nitrogen protection: the platinum sheet is the anode, the platinum wire is the quasi-reference electrode, and the cathode is nickel Foil current collector with a thickness of 0.03mm; the ...

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Abstract

The invention relates to a method for preparing a cathode of a lithium ion battery with a lithium-silicon film through pulse electrodeposition, belonging to the technical field of lithium ion batteries. The method for preparing the cathode of the lithium ion battery with the lithium-silicon film through pulse electrodeposition comprises the following process steps of: (1) electrolyte preparation: adding lithium salt and silicon tetrachloride into an anhydrous organic solvent under the protection of insert gases, and dissolving by stirring to obtain electrolyte; (2) pulse electrodeposition: carrying out lithium and silicon co-electrodeposition on the prepared electrolyte under the protection of inert gases and at the temperature of 20-30 DEG C, wherein a platinum sheet is used as an anode, a platinum wire is used as a reference electrode, and a cathode is a planar metal current collector or meshy metal current collector; carrying out electrodeposition in a constant-current pulse or constant-voltage pulse way; then, flushing by using an anhydrous aprotic organic solvent to obtain the cathode provided by the invention. The method has the advantages of uniform deposition layer, tight combination between the lithium and silicon film and the metal current collector, high lithium storage quantity, controllable circulation capacity and first circulation efficiency, good circulation stability and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a method for preparing lithium-silicon thin-film lithium-ion battery negative poles by pulse electrodeposition. Background technique [0002] At present, commonly used lithium-ion batteries are composed of graphitized carbon negative electrodes (such as mesocarbon microspheres MCMB and CMS) and transition metal oxide positive electrodes (such as LiCoO 2 ), the lithium storage capacity of these anode materials is not high, so the research and application of anode materials for high-capacity lithium-ion batteries has become the key to improving battery performance. Among the known lithium storage materials, silicon has the highest theoretical capacity (about 4200mAh g -1 ) and relatively moderate lithium intercalation potential (about 0.1-0.5V vs. Li / Li + ), very suitable for the negative electrode material of lithium ion battery (J.O.Besenhard, J.Yang, et.al., J Po...

Claims

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Application Information

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IPC IPC(8): H01M4/1395C25D5/18C25D3/56
CPCY02E60/122H01M4/0452H01M4/1395Y02E60/10
Inventor 于海艳吕荣冠王坚
Owner 盐城市新能源化学储能与动力电源研究中心
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