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Chemical lithiation of electrode active material

An electrode active material, electrochemical technology, used in electrochemical generators, negative electrodes, electrode manufacturing and other directions, can solve problems such as problems

Active Publication Date: 2018-03-13
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By-products formed during lithiation exist as gases or solids and can therefore be problematic in further processes

Method used

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  • Chemical lithiation of electrode active material

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Experimental program
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Effect test

Embodiment 1

[0086] Under an argon atmosphere, 50 g of polycrystalline silicon were added with stirring to 500 ml of a 2M solution of phenyllithium in cyclohexane / diethyl ether (70 / 30). The resulting suspension was stirred at room temperature for 10 hours. The prelithiated silicon was then filtered off and washed with cyclohexane / diethyl ether (70 / 30). 7 g of pre-lithiated silicon was treated with 2 g of carbon black, SBR in 1 g of toluene to give a paste. It was applied on both surfaces of the current collector 31 made of copper foil. The solvent was removed under reduced pressure. The electrode thus prepared can be used as the negative electrode 21 in a lithium ion battery.

Embodiment 2

[0088] with H 2 O treated a mixture of 7 g of silicon, 2 g of carbon black, and 1 g of polyacrylic acid (PAA) to obtain a paste. It was applied on both surfaces of the current collector 31 made of copper. The solvent was removed under reduced pressure. The electrode thus prepared was placed in a hexane solution (1.5 mol / L) of n-hexyllithium at room temperature for 30 minutes under an argon atmosphere. The pre-lithiated electrode is then washed with hexane and, after removing any solvent residue, can be used as the negative electrode 21 in a Li-ion battery.

[0089] exist figure 1 An electrochemical energy storage system 2 in the form of a battery cell is schematically shown in . The energy storage system 2 contains a battery housing 3 which is designed in the shape of a prism, here cuboid. The battery housing 3 is here electrically conductive and is made, for example, of aluminum. The battery housing 3 can however also be made of an electrically insulating material, for ...

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Abstract

The invention relates to a method for manufacturing an electrochemical energy storage system (2) that includes at least one electrode (21, 22), especially an anode, wherein the at least one electrodeincludes at least one prelithiated electrode active material (41, 42) and at least one current collector (31, 32). Lithiation is performed by reacting the electrode active material (41, 42) with an organolithium compound of formula Li-R, wherein R is selected from the group consisting of: a linear or branched, saturated or unsaturated, preferably saturated, aliphatic or heteroaliphatic hydrocarbongroup having 5 to 12 carbon atoms, which can include at least one heteroatom selected from Si, S, N, and O; a cycloaliphatic or heterocycloaliphatic hydrocarbon group having 5 to 12 carbon atoms, which can include at least one heteroatom selected from Si, S, N, and O; and an aromatic or heteroaromatic hydrocarbon group having 5 to 9 carbon atoms, which can include at least one heteroatom selectedfrom Si, S, N, and O.

Description

technical field [0001] Conventional electrochemical energy storage systems, such as lithium-ion batteries, typically use graphite as an anode material, which is characterized by good Coulombic efficiency and low charge loss during the first charging cycle. In view of the requirements for future energy storage systems, especially in the field of electromobility, the use of anode materials with higher storage capacities is indispensable. Silicon exhibits these desirable properties, but on the other hand, has lower cycle stability than graphite. It is known that this effect can be counteracted by lithiation of the anode material. Background technique [0002] US 5,543,021 A discloses a method for preparing a prelithiated carbon-containing anode material and its use in electrodes for energy storage systems. As a lithiation agent, butyl lithium and naphthalene lithium are used. By-products formed during lithiation are present as gases or solids and can therefore be problematic...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M10/0525H01G11/50
CPCH01G11/50H01M4/1395H01M10/0525H01M4/134H01M4/0404H01M4/386Y02E60/10Y02E60/13H01M2004/027
Inventor A.贡泽
Owner ROBERT BOSCH GMBH
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