A positive temperature coefficient thermosensitive material and its preparation method

A technology of positive temperature coefficient and heat-sensitive material, applied in resistors with positive temperature coefficient, electrical components, electrochemical generators, etc. Exothermic reaction, avoid short-circuit discharge, improve the effect of anti-overcharge

Active Publication Date: 2019-06-25
DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the structure of this heat-sensitive material is mostly similar to ceramic materials, and when used in lithium-ion batteries, it will have a certain impact on the internal resistance of the battery
Therefore, when using it, it is necessary to limit the amount of this material used, and if the amount used is too small, the improvement of battery safety is very limited.

Method used

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  • A positive temperature coefficient thermosensitive material and its preparation method

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Comparison scheme
Effect test

Embodiment 1

[0033] The positive temperature coefficient heat-sensitive material of this embodiment is made of the following raw materials: strontium source, titanium source, manganese source, metal oxide, sintering aid; the above-mentioned strontium source, titanium source, manganese source, metal oxide, sintering aid The molar ratio is 0.9915:1.0095:0.0004:0.002:0.001; the strontium source is strontium titanate, the titanium source is titanium dioxide, and the manganese source is Mn(NO 3 ) 2 , the metal oxide is Nd with a molar ratio of 1:3 2 o 3 and La 2 o 3 , The sintering aid is a mixture of alumina, silicon dioxide, and zirconium dioxide in a molar ratio of 0.03:0.03:0.62.

[0034] The preparation method of the positive temperature coefficient thermosensitive material of the present embodiment comprises the following steps:

[0035] 1) Mixing

[0036] Strontium titanate, titanium dioxide, Nd with a molar ratio of 0.9915:1.0095:0.0005:0.0015 2 o 3 , La 2 o 3 Put it into a ba...

Embodiment 2

[0043] The positive temperature coefficient heat-sensitive material of this embodiment is made of the following raw materials: strontium source, titanium source, manganese source, metal oxide, sintering aid; the above-mentioned strontium source, titanium source, manganese source, metal oxide, sintering aid The molar ratio is 0.99:1.0085:0.0005:0.005:0.002; the strontium source is strontium titanate, the titanium source is titanium dioxide, and the manganese source is Mn(NO 3 ) 2 , the metal oxide is Nd with a molar ratio of 1:3 2 o 3 and Sb 2 o 3 , The sintering aid is a mixture of alumina, silicon dioxide, and zirconium dioxide in a molar ratio of 0.03:0.03:0.62.

[0044] The preparation method of the positive temperature coefficient thermosensitive material of the present embodiment comprises the following steps:

[0045] 1) Mixing

[0046] Strontium titanate, titanium dioxide, Nd with a molar ratio of 0.99:1.0085:0.0005:0.0015 2 o 3 , Sb 2 o 3 Put it into a ball m...

Embodiment 3

[0053] The positive temperature coefficient heat-sensitive material of this embodiment is made of the following raw materials: lead source, titanium source, manganese source, metal oxide, sintering aid; the above-mentioned lead source, titanium source, manganese source, metal oxide, sintering aid The molar ratio is 0.9915:1.0095:0.0004:0.002:0.001; wherein the lead source is lead titanate, the titanium source is titanium dioxide, and the manganese source is Mn(NO 3 ) 2 , the metal oxide is Nd with a molar ratio of 1:3 2 o 3 and Y 2 o 3 , The sintering aid is a mixture of alumina, silicon dioxide, and zirconium dioxide in a molar ratio of 0.03:0.03:0.62.

[0054] The preparation method of the positive temperature coefficient thermosensitive material of the present embodiment comprises the following steps:

[0055] 1) Mixing

[0056] Lead titanate, titanium dioxide, Nd with a molar ratio of 0.9915:1.0095:0.0005:0.0015 2 o 3 , Y 2 o 3 Put it into a ball mill, add water ...

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Abstract

The invention relates to a positive temperature coefficient heat-sensitive material and a preparation method thereof, and belongs to the technical field of a heat-sensitive material. The positive temperature coefficient heat-sensitive material is prepared from a raw material comprising the following constituents: one of a strontium source and a lead source, a titanium source, a manganese source, ametal oxide and a combustion-assisted agent, wherein the mole ratio of the strontium source or the lead source, the titanium source, the manganese source, the metal oxide and the combustion-assistedagent is (99-99.5):(100.85-100.95):(0.04-0.05):(0.2-0.5):(0.1-0.2), and the metal oxide is an arbitrary oxide of Nb, Ta, Bi, Sb, Y and La or a combination of the oxide. A resistance value of the positive temperature coefficient heat-sensitive material is increased in a stepped way with temperature rising when a certain temperature (Curie temperature) is exceeded, the material has small resistanceat a temperature below the Curie temperature, and a positive temperature coefficient (PTC) layer has temperature sensitivity by the material.

Description

technical field [0001] The invention relates to a positive temperature coefficient heat-sensitive material and a preparation method thereof, belonging to the technical field of heat-sensitive materials. Background technique [0002] As an emerging technology, lithium-ion batteries have many advantages over traditional batteries. In the prior art, lithium-ion batteries have been widely used in various industries. The most prominent representative is that a single lithium-ion battery is used as a power source for mobile phones, while new energy electric vehicles basically use lithium-ion batteries as a power source. Based on the advantages of lithium-ion batteries at home and abroad, they have focused on research and breakthroughs in theory and engineering in recent years, and have basically mastered the application characteristics of the batteries. Although lithium-ion battery packs can well meet the development needs of electric products, there are always hidden unsafe fact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/02H01M10/637
CPCY02E60/10
Inventor 杨阳李亚南赵永锋许飞罗传军刘兴福李小涛李莉仲启方
Owner DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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