Glass, in particular solder glass or fusible glass

Abstract

A glass, for example a glass solder, includes the following components in mole percent (mol-%): P2O5 37-50 mol-%, for example 39-48 mol-%; Al2O3 0-14 mol-%, for example 2-12 mol-%; B2O3 2-10 mol-%, for example 4-8 mol-%; Na2O 0-30 mol-%, for example 0-20 mol-%; M2O 0-20 mol-%, for example 12-20 mol-%, wherein M is, for example, K, Cs or Rb; Li2O 0-42 mol-%, for example 0-40 mol-% or 17-40 mol-%; BaO 0-20 mol-%, for example 0-20 mol-% or 5-20 mol-%; and Bi2O3 0-10 mol-%, for example 1-5 mol-% or 2-5 mol-%.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001]This is a continuation of PCT application No. PCT / EP2012 / 000703, entitled “GLASS, IN PARTICULAR GLASS SOLDER OR FUSIBLE GLASS”, filed Feb. 17, 2012 which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a glass and by association to a glass composition, in particular a solder glass as well as to a feed-through for a storage device, such as a lithium-ion battery, for example a lithium-ion accumulator.[0004]2. Description of the Related Art[0005]Solder glasses or fusible glasses are glasses which are used to bond metals having a high heat expansion and low melting temperature, for example by means of soldering with a solder glass or sealing by means of a fusible glass.[0006]Glasses which find use as solder glasses are known from a multitude of patent specifications. For example, U.S. Pat. No. 5,262,364 describes a high expansion solder glass comprising 10-2...

AI Technical Summary

Benefits of technology

[0022]Surprisingly it has been shown that the inventive glass composition with a lithium-share of up to 45 mol-%, for example 35 mol-% are crystallization-stable, meaning they do not display detrimental crystallization during a subsequent sintering process. At a lithium-content of up to 35 mol-%, significant crystallization is no longer produced. The high crystallization stability of the phosphate glasses ensures that melting of the glasses generally is not hindered even at temperatures of <600° C. This allows the inventive glass composition to be used as solder glass, since melting of the glasses generally is not hindered even at temperatures of <600° C.

[0057]The feed-through according to the present invention, in particular the battery feed-through, has a sufficient chemical stability, in particular in regard to non-aqueous battery electrolytes.

Problems solved by technology

A disadvantage of the solder glass according to U.S. Pat. No. 5,262,364 is that the solder glass contains lead, in other words PbO as well as a relatively high amount of Na2O.

Even though these glasses contain little or no lead, they do have very high alkali content.

In particular in the use of storage devices, such as lithium-ion accumulators in the automobile industry, a multitude of problems such as corrosion resistance, stability in accidents and vibration resistance must be solved.

An additional problem is the hermetic seal of the battery, for example the lithium-ion battery over an extended period of time.

The hermetic seal may, for example, be compromised by leakage in the area of the electrodes of the battery or respectively the electrode feed-through of the battery.

The seal may for example be compromised by a battery short circuit or temperature changes resulting in a shortened life span.

An additional problem with battery feed-throughs is the instability against aggressive battery electrolytes, in particular non-aqueous electrolytes as are used, for example in lithium-ion accumulators.

A disadvantage of the synthetic material insulation is the limited temperature resistance, the uncertain hermetic seal over the service life and the limited chemical stability in regard to the battery electrolytes.

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