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Thin film electrolyte for thin film batteries

A technology of electrolyte and inorganic electrolyte, which is applied in the direction of non-aqueous electrolyte, solid electrolyte, non-aqueous electrolyte battery, etc., and can solve the problems of large battery impedance, Lipon electrolyte body ion conductivity, large charge transfer resistance, etc.

Active Publication Date: 2010-12-29
SAPURAST RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when the Lipon TFB is operated below 0°C, especially for the temperature range of -40°C, as required by military or aerospace applications and other government departments, the battery internal impedance of currently known lithium compounds will change. too big
The reason for this characteristic is that the bulk ionic conductivity of the Lipon electrolyte at the cathode and anode interface and its charge transfer resistance become too large at low temperature

Method used

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Examples

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Embodiment 1

[0044] Embodiment 1: In a specific embodiment of the present invention, tested the Li of electrolyte in conductivity test cell with two sandwich inert metal electrodes + ionic conductivity. This electrolyte exhibits an improved activation enthalpy, E a Less than 0.5eV (compared to Lipond's E a =0.514eV), so that Li at 25°C + Ionic conductivity greater than 5*10 -6 S / cm. The Li of the electrolyte at 0°C + Ionic conductivity is 1.48*10 -6 S / cm, 5 times higher than Lipon (2.95*10 -7 S / cm), 10 times higher at -40°C (8.1*10 -8 S / cm) (Lipon: 8.1*10 -9 S / cm). The electrolyte of the present invention is relatively Li before collapse + The electrochemical stability window of Li / Li is at least 0-5.5V, and the electronic conductivity significantly exceeds 1*10 -6 S / cm.

Embodiment 2

[0045] Example 2: In yet another embodiment, a size of 1 inch is prepared using the electrolyte of the present invention 2 The TFB can supply 700μAh at 1 / 2C rate in the voltage range of 4.2-2.0V at 25℃, and deliver 250μAh at 100mA (140C rate) at the same temperature and the same voltage window. This TFB was prepared on a 50μm metal foil substrate, which also contained a 0.5μm conductive barrier layer, 3.5μm LiCoO 2 Positive cathode, 1.2 μm inventive electrolyte, approximately 9 μm Li anode and standard metal foil envelope, where the metal foil substrate is also used as the positive terminal.

Embodiment 3

[0046] Example 3: One embodiment of the present invention consists of preparing a TFB that can supply 700 μAh at 1 / 2C rate in the voltage range of 4.2-2.0V at 25°C, at -40°C and the same voltage window within, capable of delivering a continuous current of 0.4mA.

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Abstract

The invention relates to a solid-state lithium-ion thin- film electrolyte that, compared to the current state-of-the-art thin-film electrolyte, Lipon, exhibits an equal or larger electrochemical stability window (0-5.5 V vs. Li+ / Li), an equal or smaller electronic conductivity (10-14 S / cm at 25 DEG C), the same ideal transference number for Li+ions (t =1.000), and a 10x higher Li+ion conductivity at -400C. Latter provides thin- film batteries (TFBs) with at least a 5x higher power performance at -400C over the current state- of-the-art Lipon TFBs.

Description

[0001] related application [0002] This application is related to and claims priority under 35 U.S.C. §119 to U.S. Provisional Patent Application No. 61 / 022904, entitled "Membrane Electrolytes for Thin Film Batteries," filed January 23, 2008; US Patent Application Serial No. 12 / 339,361, filed May 19, entitled "Method for Sputtering Targets for Electrolyte Membranes," and claims priority thereto under 35 U.S.C. §120, and US Patent Application Serial No. 12 / No. 339,361 claims priority under 35 U.S.C. §119 to U.S. Provisional Patent Application No. 61 / 016038, filed December 21, 2007, entitled "Method for Sputtering Targets for Electrolyte Films," all of which are filed in their entirety at Incorporated herein by reference. technical field [0003] The present invention relates to a solid lithium ion thin film electrolyte having, for example, enhanced lithium ion conductivity, which helps to improve the electrical performance and shelf life of thin film batteries; it also relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/08
CPCH01M10/0562C04B2235/3227H01M2300/0068C04B2235/3203H01M10/052C04B2235/3224C04B2235/3217C04B35/447H01B1/122C04B2235/3225C04B2235/3244C04B35/58Y02E60/10
Inventor B·J·纽德克尔
Owner SAPURAST RES
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