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Lithium anode-protecting polymer layer for a lithium metal secondary battery and manufacturing method

A lithium secondary battery and polymer technology, applied in secondary batteries, lithium batteries, battery electrodes, etc., can solve problems such as no plausible solutions

Pending Publication Date: 2020-03-24
NANOTEK INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This important problem has been largely ignored and has had no plausible solution in the battery industry

Method used

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  • Lithium anode-protecting polymer layer for a lithium metal secondary battery and manufacturing method
  • Lithium anode-protecting polymer layer for a lithium metal secondary battery and manufacturing method
  • Lithium anode-protecting polymer layer for a lithium metal secondary battery and manufacturing method

Examples

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Effect test

example 1

[0104] Example 1: Lithium anode with elastic polymer protection and V 2 o 5 Granular Cathode for Lithium Batteries

[0105] respectively by V 2 o 5 V surrounded by particles and graphene 2 o 5 The particles prepare the cathode active material layer. V 2 o 5 Pellets are commercially available. V surrounded by graphene 2 o 5 Granules are prepared in-house. In a typical experiment, by placing V 2 o 5Mix in an aqueous LiCl solution to obtain a vanadium pentoxide gel. The Li+ exchanged gel obtained by interaction with LiCl solution (Li:V molar ratio kept at 1:1) was mixed with GO suspension and then placed in a Teflon-lined stainless steel 35 ml autoclave, sealed, and heated up to 180° C. for 12 h. After this hydrothermal treatment, the green solid was collected, washed thoroughly, sonicated for 2 min, and dried at 70 °C for 12 h, then mixed with another 0.1% GO in water, sonicated to break down the nanoribbon size, and It was then spray-dried at 200 °C to obtain gr...

example 2

[0113] Example 2: High Elastic Polymer in Li-LiCoO 2 Implementation in the anode of a cell (originally said cell does not contain lithium)

[0114] The highly elastic polymer used for anode protection is based on cationic polymerization and crosslinking of cyanoethyl polyvinyl alcohol (PVA-CN) in succinonitrile (SN). The procedure starts with dissolving PVA-CN in succinonitrile to form a mixture solution. This step is followed by the addition of an initiator to the solution. For the purpose of incorporating some lithium species into the elastomeric polymer, we choose to use LiPF 6 as an initiator. LiPF 6 The ratio to the PVA-CN / SN mixture solution was varied from 1 / 20 to 1 / 2 by weight to form a series of precursor solutions. Subsequently, these solutions were separately spray-deposited onto the lithium foil surface to form thin layers of precursor reactive species. The precursor reactive mass is then heated at a temperature from 75°C to 100°C for 2 to 8 hours to obtain a...

example 3

[0117] Example 3: Li Metal Cell Containing Metal Fluoride Nanoparticle-Based Cathode and PETEA-Based Highly Elastic Polymer Protected Li Anode

[0118] For acting as an anode lithium metal protective layer, pentaerythritol tetraacrylate (PETEA) (Formula 3) was used as monomer:

[0119]

[0120] In a representative procedure, the precursor solution was composed of 1.5 wt.% PETEA dissolved in a solvent mixture of 1,2-dioxolane (DOL) / dimethoxymethane (DME) (1:1 by volume). (C 17 h 20 o 8 ) monomer and 0.1wt.% azobisisobutyronitrile (AIBN, C 8 h 12 N 4 ) Initiator composition. The PETEA / AIBN precursor solution was cast onto a Li metal layer pre-deposited on the surface of Cu foil to form a precursor film, which was polymerized and cured at 70 °C for half an hour to obtain a lightly cross-linked polymer .

[0121] Additionally, the reactive mass PETEA / AIBN (without conductive additives) was cast onto a glass surface to form several films, which were polymerized and cured...

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Abstract

Provided is lithium secondary battery comprising a cathode, an anode, and an electrolyte or separator-electrolyte assembly disposed between the cathode and the anode, wherein the anode comprises: (a)a foil or coating of lithium or lithium alloy; and (b) a thin layer of a high-elasticity polymer disposed between the foil / coating and the electrolyte (or separator-electrolyte assembly), having a recoverable tensile strain no less than 2%, a lithium ion conductivity no less than 10-6 S / cm at room temperature, and a thickness from 1 nm to 10 [mu]m, wherein the high-elasticity polymer contains a cross-linked network of polymer chains having an ether linkage, nitrile-derived linkage, benzo peroxide-derived linkage, ethylene oxide linkage, propylene oxide linkage, vinyl alcohol linkage, cyano-resin linkage, triacrylate monomer-derived linkage, tetraacrylate monomer-derived linkage, or a combination thereof in the cross-linked network of polymer chains.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Patent Application No. 15 / 485,934, filed April 12, 2017, which is incorporated herein by reference. technical field [0003] The present invention relates to the field of rechargeable lithium metal batteries having a lithium metal layer (in the form of a thin lithium foil, coating or sheet) as the anode active material and methods of manufacture thereof. Background technique [0004] Lithium-ion and lithium (Li) metal cells (including lithium-sulfur cells, Li-air cells, etc.) are considered to be used in electric vehicles (EV), hybrid electric vehicles (HEV) and portable electronic devices such as laptop Promising power sources for small computers and cell phones. With any other metal or metal intercalation compound (except Li 4.4 Lithium metal has the highest capacity (3,861mAh / g) compared to Si). Therefore, in general, rechargeable Li metal batteries have significantly higher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0569H01M2/02
CPCH01M4/134H01M4/1395H01M10/052H01M4/628H01M4/5825H01M4/5815Y02E60/10Y02P70/50
Inventor 潘宝飞贺慧阿茹娜·扎姆张博增
Owner NANOTEK INSTR
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