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Electrolytes, cells and methods of forming passivaton layers

A technology for electrolytes and batteries, applied in the fields of electrolytes, batteries and the formation of passivation layers

Active Publication Date: 2009-02-25
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The present invention solves the problems associated with conventional reversible or rechargeable cells for lithium batteries by providing an electrolyte that produces a suitable SEI layer

Method used

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  • Electrolytes, cells and methods of forming passivaton layers
  • Electrolytes, cells and methods of forming passivaton layers
  • Electrolytes, cells and methods of forming passivaton layers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] figure 1 MCMB / Li overcharged by a pulse is shown 1.1 [Mn 1 / 3 Ni 1 / 3 co 1 / 3 ] 0.9 o 2 (L333) The battery voltage of the Li-ion battery. The electrolyte used was 1.2 M LiPF in EC / PC / DMC (1:1:3 by weight, EC for ethylene carbonate, PC for propylene carbonate and DMC for dimethyl carbonate) 6 . The battery was pulse overcharged for 18 seconds every 60 minutes at the 8C rate (20 mA). figure 1 It is clearly shown that the cell voltage increases steadily with the number of pulsed currents applied. In only 4 pulses, the peak voltage of the battery increased to 4.95 V, which was high enough to trigger the decomposition of the positive electrode and anhydrous electrolyte.

Embodiment 1

[0056] figure 2 MCMB / Li overcharged by a pulse is shown 1.1 [Mn 1 / 3 Ni 1 / 3 co 1 / 3 ] 0.9 o 2 (L333) The battery voltage of the Li-ion battery. The electrolyte used was 0.8M LiBOB in EC / PC / DMC (1:1:3 by weight). The battery was pulse overcharged for 18 seconds every 60 minutes at the 8C rate (20 mA). figure 2 It is clearly shown that the cell voltage increases steadily with the number of pulsed currents applied. In only 4 pulses, the peak voltage of the battery increased to 4.95 V, which was high enough to trigger the decomposition of the positive electrode and anhydrous electrolyte.

Embodiment 1

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Abstract

An electrolyte comprising at least one organic aprotic solvent, at least one salt and at least one chelatoborate additive. A method of forming an SEI layer in a cell comprising a positive electrode, a negative electrode and an electrolyte, said method comprising the step of overcharging the electrolyte prior to fabricating the cell, or said cell during the formation cycle.

Description

[0001] This application is a continuation-in-part of Application No. 11 / 300287, filed December 15,2005. Application No. 11 / 300287 claims priority over provisional application No. 60 / 642,815, filed January 11,2005. The disclosure of the prior application is hereby incorporated by reference. [0002] Statement Regarding Federally Sponsored Research or Development [0003] The Government has rights in this invention pursuant to Agreement 85N14 between Argonne National Laboratory and Air Products And Chemicals, Inc. Background of the invention [0001] Lithium and lithium-ion secondary batteries, due to the large reduction potential and low molecular weight of elemental lithium, offer enormous improvements in power density over existing primary battery and storage battery technologies. A lithium secondary battery is a battery including metallic lithium as a negative electrode. Lithium-ion batteries contain a lithium-ion host material as a negative electrode. "Battery" means a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M6/16H01M4/58H01M4/48H01G11/06H01G11/54H01G11/58H01G11/60H01G11/62H01M4/131H01M4/133H01M4/38H01M4/485H01M4/505H01M4/525H01M4/587H01M10/052H01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M10/36
CPCH01M10/052H01M10/0567H01M10/0568Y02T10/7011Y02E60/122H01M4/133H01M4/131Y02E60/10Y02P70/50H01M10/05H01M4/02H01M4/48H01M4/58
Inventor 陈宗海K·阿迈恩
Owner AIR PROD & CHEM INC
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