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Lithium secondary batteries containing protected particles of anode active materials and method of manufacturing

一种阳极活性、锂电池的技术，应用在二次电池、燃料电池型的半电池和二次电池型的半电池、活性物质电极等方向，能够解决过度、没有展示复合材料等问题

Pending Publication Date: 2019-12-17
NANOTEK INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, polymeric carbon, amorphous carbon, or pre-graphitized carbon may have too many lithium capture sites that irreversibly trap lithium during the first few cycles, resulting in excessive irreversibility
[0016] In conclusion, the prior art does not demonstrate a composite material having all or most of the properties desired for use as an anode active material in lithium-ion batteries

Method used

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  • Lithium secondary batteries containing protected particles of anode active materials and method of manufacturing
  • Lithium secondary batteries containing protected particles of anode active materials and method of manufacturing
  • Lithium secondary batteries containing protected particles of anode active materials and method of manufacturing

Examples

Experimental program
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Effect test

example 1

[0122] Example 1: cobalt oxide (Co 3 o 4 ) anode particles

[0123] Appropriate amount of inorganic salt Co(NO 3 ) 2 ·6H 2 O and ammonia solution (NH 3 ·H 2 O, 25wt.%) are mixed together. The resulting suspension was stirred under argon flow for several hours to ensure complete reaction. The obtained Co(OH) 2 The precursor suspension was calcined at 450 °C for 2 h in air to form layered Co 3 o 4 particle. Partial Co was then encapsulated with an ETPTA-based elastomeric polymer according to the following procedure 3 o 4 Particles:

[0124] Ethoxylated trimethylolpropane triacrylate monomer (ETPTA, Mw=428, Sigma-Aldrich) was added at a weight basis of 3 / 97 (w / w) of ETPTA / solvent The composition ratio is dissolved in a solvent mixture of ethylene carbonate (EC) / diethyl carbonate (DEC). Subsequently, benzoyl peroxide (BPO, 1.0 wt.% relative to the ETPTA content) was added as a radical initiator to allow thermal crosslinking reaction after mixing with the anode parti...

example 2

[0132] Example 2: Tin Oxide Particles Encapsulated by Elastomeric Polymer

[0133] Pass through SnCl using the following procedure 4 ·5H 2 The controlled hydrolysis of O and NaOH yields tin oxide (SnO2 ) nanoparticles: the SnCl 4 ·5H 2 O (0.95 g, 2.7 m-mol) and NaOH (0.212 g, 5.3 m-mol) were each dissolved in 50 mL of distilled water. The NaOH solution was added dropwise to the tin chloride solution at a rate of 1 mL / min under vigorous stirring. This solution was homogenized by sonication for 5 min. Subsequently, the resulting hydrosol was reacted with H 2 SO 4 reaction. Add a few drops of 0.1M H to this mixed solution 2 SO 4 to flocculate the product. The precipitated solid was collected by centrifugation, washed with water and ethanol and dried in vacuo. The dried product was heat-treated at 400 °C for 2 h under Ar atmosphere.

[0134] Used to encapsulate SnO 2 The elastomeric polymer of the nanoparticles is based on cationic polymerization and crosslinking of c...

example 3

[0137] Example 3: Tin (Sn) Nanoparticles Encapsulated by PETEA-Based Elastomeric Polymer

[0138] For the encapsulation of Sn nanoparticles, pentaerythritol tetraacrylate (PETEA) (Formula 3) was used as monomer:

[0139]

[0140] The precursor solution consisted of 1.5 wt.% PETEA (C 17 h 20 o 8 ) monomer and 0.1wt.% azobisisobutyronitrile (AIBN, C 8 h 12 N 4 ) Initiator composition. Nanoparticles of Sn (76 nm in diameter) were added to the precursor solution and encapsulated with a thin layer of PETEA / AIBN / solvent precursor solution by spray drying (some solvent evaporated, but some remained). The precursor solution was polymerized and cured at 70° C. for half an hour to obtain microparticles consisting of particles encapsulated by the elastomeric polymer.

[0141] The reaction mass PETEA / AIBN (without Sn particles) was cast onto a glass surface to form several films, which were polymerized and cured to obtain crosslinked polymers with different degrees of crosslinki...

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Abstract

Provided is anode active material layer for a lithium battery, the anode active material layer comprising multiple particulates of an anode active material, wherein a particulate is composed of one ora plurality of particles of a high-capacity anode active material being embraced or encapsulated by a thin layer of a high-elasticity polymer having a recoverable tensile strain no less than 10% whenmeasured without an additive or reinforcement, a lithium ion conductivity no less than 10-5 S / cm at room temperature, and a thickness from 0.5 nm (or a molecular monolayer) to 10 [mu]m (preferably less than 100 nm), and the high-capacity anode active material has a specific lithium storage capacity greater than 372 mAh / g (e.g. Si, Ge, Sn, SnO2, Co3O4, etc.).

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Patent Application No. 15 / 436,964, filed February 20, 2017, which is incorporated herein by reference. technical field [0003] The present invention relates generally to the field of rechargeable lithium batteries, and more particularly to anode active materials in the form of elastomeric polymer-encapsulated particles and methods for their production. Background technique [0004] The unit cell or structural unit of a Li-ion battery typically consists of an anode current collector, an anode or negative electrode layer (containing an anode active material responsible for storing lithium therein, a conductive additive and a resin binder), an electrolyte and a porous separator, a cathode or The positive electrode layer (containing the cathode active material responsible for storing lithium therein, the conductive additive and the resin binder) and a separate cathode current collect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/60H01M4/62
CPCH01M4/38H01M4/405H01M4/485H01M4/62H01M12/08H01M4/366H01M10/0525H01M4/628H01M4/625H01M4/386H01M4/387H01M2004/027H01M2004/021Y02E60/10
Inventor 潘宝飞贺慧阿茹娜·扎姆张博增
Owner NANOTEK INSTR
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