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An electrolyte solution for improving the safety of lithium-manganese batteries

A technology of electrolyte solution and lithium-manganese battery, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of premature battery failure safety, battery internal pressure and temperature rise, and potential safety hazards, so as to improve safety issues , reduce the reaction, prevent the effect of explosion accidents

Inactive Publication Date: 2011-11-30
BASF BATTERY MATERIALS SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of battery has the following disadvantages: 1. Under the condition of short circuit, the internal pressure and temperature of the battery rise at the same time, which not only makes the battery easy to fail early but also has great potential safety hazards, such as explosion; 2. The external circuit current suddenly If it is too large, the internal pressure and temperature of the battery will rise at the same time, and there will be great safety hazards, such as explosion; 3. Under the condition of over-discharge, the internal pressure of the battery will be too high, and the battery will have a drum bottom or even explode possibility of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Using electrolytic manganese dioxide as the positive electrode, lithium metal as the negative electrode, and PP material as the diaphragm: electrolyte solution 1M (A:B) / PC-DME-DXL (1:1:1, vol), composed of CR2032 button batteries, safety evaluation The method adopts the battery short-circuit temperature method.

[0012] The table below shows four examples of the above button-type primary lithium-manganese batteries.

[0013] The percentage content of A in the compound salt Percentage of B in compound salt solvent system battery short circuit temperature Example 1 LiClO 4 : 70% LiB(C 2 o 4 ) 2 : 30% PC-DME-DXL 42℃ Example 2 LiClO 4 : 50% LiB(C 2 o 4 ) 2 : 50% PC-DME-DXL 40℃ Example 3 LiClO 4 : 30% LiB(C 2 o 4 ) 2 : 70% PC-DME-DXL 38℃ Example 4 LiClO 4 : 100% LiB(C 2 o 4 ) 2 : 0% PC-DME-DXL 60℃

[0014] It can be seen from the table that with LiB(C 2 o 4 ) 2 The ratio incre...

Embodiment 2

[0016] CR17450 battery is used, the positive electrode is electrolytic manganese dioxide, the negative electrode is lithium metal, and the diaphragm is made of PP material: electrolyte 1M (A:B) / PC-DME (1:1, vol), composed of CR17450 cylindrical battery, and the safety evaluation method adopts Heavy object impact safety test method.

[0017] The following table shows five examples of the above cylindrical primary lithium-manganese batteries.

[0018] The percentage content of A in the compound salt Percentage of B in compound salt solvent system Safety test Example 1 LiClO 4 : 80% LiB(C 2 o 4 ) 2 : 20% PC-DME overheating, fire, no explosion Example 2 LiClO 4 : 70% LiB(C 2 o 4 ) 2 : 30% PC-DME overheating, fire, no explosion Example 3 LiClO 4 : 60% LiB(C 2 o 4 ) 2 : 40% PC-DME overheating, no fire, no explosion Example 4 LiClO 4 : 30% LiB(C 2 o 4 ) 2 : 70% PC-DME Not hot, no fire, no...

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PUM

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Abstract

The invention relates to a lithium battery electrolyte solution, which is an electrolyte solution for improving the safety of lithium-manganese batteries. The electrolyte solution is composed of two types of components: (1) a composite lithium salt composed of component A and component B; (2) carbonate class and / or ether organic solvents; the molar concentration range of the composite lithium salt in this electrolytic solution is 0.01-2 mol / liter, and the balance is carbonates and / or ether organic solvents; the composite lithium salt component A is At least one of the following substances: LiAsF6, LiPF6, LiBF4, LiClO4LiCF3SO3, LiN(CF3SO2)2, LiC4F9SO3, LiN(CxF2x+1SO2) (CyF2y+1SO2), where x and y are natural numbers; composite lithium salt component B It is at least one of the following substances: LiB(C2O4)2 or LiBF2C2O4; the molar concentration percentage of component A in the composite lithium salt is 0.01-99.99%, and the molar concentration percentage of component B in the composite lithium salt is 0.01-99.99% . The invention can greatly reduce the potential safety hazard of the lithium-manganese battery, prevent explosion accidents, and highlight and improve the safety problem of the battery.

Description

technical field [0001] The invention relates to an electrolyte solution for a lithium battery, in particular to an electrolyte solution suitable for a button-type cylindrical lithium manganese dioxide battery or a soft-packed lithium manganese dioxide battery and improving the safety of the lithium manganese battery. Background technique [0002] Lithium manganese dioxide battery, hereinafter referred to as lithium manganese battery, belongs to primary lithium battery. Lithium-manganese batteries have the advantages of high discharge current, pulse discharge capability, and no voltage hysteresis, accounting for nearly 50% of primary lithium batteries, and are widely used in smart meters, electronic security and RFID fields. This type of battery has the following disadvantages: 1. Under the condition of short circuit, the internal pressure and temperature of the battery rise at the same time, which not only makes the battery easy to fail early but also has great potential saf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568
CPCY02E60/12Y02E60/10
Inventor 胡学山袁芳周小进顾红健
Owner BASF BATTERY MATERIALS SUZHOU
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