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Determination method for trace moisture content in positive electrode and negative electrode pole pieces of lithium battery

A technology of positive and negative pole pieces and trace moisture, which is applied in the field of trace moisture measurement, can solve problems such as toxicity, large error, and lithium battery failure, and achieve the effects of simple operation method, short measurement time, and low measurement cost.

Inactive Publication Date: 2012-12-19
四川鑫唐新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the manufacturing process of lithium-ion batteries, the moisture in the pole piece must be strictly controlled. The moisture in the pole piece has a great impact on the lithium-ion battery, mainly causing the following adverse consequences: When the moisture inside the battery will interact with the electrolytic The reaction product is gas and hydrofluoric acid, the gas will cause the battery shell to swell, hydrofluoric acid is a very corrosive acid, it can corrode the metal parts inside the battery, and eventually cause the battery to leak liquid, eventually causing the failure of the lithium battery
At present, most lithium battery manufacturers mainly use the Karl-Fischer method and the weight loss method to determine the trace moisture in the lithium-ion battery pole pieces. The Karl-Fischer method uses Karl-Fischer reagents, which are toxic and cannot completely measure the solid pole pieces. The trace amount of water in the medium is measured by the weight loss method, and the error is large

Method used

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  • Determination method for trace moisture content in positive electrode and negative electrode pole pieces of lithium battery
  • Determination method for trace moisture content in positive electrode and negative electrode pole pieces of lithium battery
  • Determination method for trace moisture content in positive electrode and negative electrode pole pieces of lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Under the conditions of room temperature and relative humidity less than 2%, use dry scissors to cut 3 pieces of lithium-ion battery positive and negative electrodes of about 0.40~0.83g each, put a sample boat according to a piece of electrode, and put them into dry samples Put the sample boat into the dry sampler, and use dry rubber stoppers to plug the two ends of the sampler tightly. Under ordinary atmospheric conditions, insert a nitrogen hose with a relative humidity of less than 2% into the air inlet of the sampler at a flow rate of 0.8L / min, open the shut-off valve of the sampler and remove the rubber plug, and Align the port of the sampler with the nozzle of the heating tube of the instrument, and push the sample boat into the heating tube from the other port of the sampler with dry tweezers. Set the heating temperature of the instrument to 238° C., set the working time of the instrument to 25 minutes, and adjust the flow rate of the carrier gas to 0.5 L / min. A...

Embodiment 2

[0019] Under the conditions of room temperature and relative humidity less than 2%, use dry scissors to cut about 0.40~0.83g lithium-ion battery positive

[0020] There are 3 pole pieces and 3 pieces of negative pole pieces respectively, and a sample boat is installed according to a piece of pole piece, respectively loaded into the dry sample boat, and then the sample boat is put into the dry sampler, and the two ends of the sampler are closed with dry rubber plugs. Plug tightly. Under ordinary atmospheric conditions, insert an argon hose with a relative humidity of less than 2% into the air inlet of the sampler at a flow rate of 0.8L / min, open the shut-off valve of the sampler and remove the rubber plug, Align the port of the sampler with the nozzle of the heating tube of the instrument, and push the sample boat into the heating tube from the other port of the sampler with dry tweezers. Set the heating temperature of the instrument to 266°C, set the working time of the instr...

Embodiment 3

[0024] Under the conditions of room temperature and relative humidity less than 2%, use dry scissors to cut 3 pieces of lithium-ion battery positive and negative electrodes of about 0.40~0.83g each, put a sample boat according to a piece of electrode, and put them into dry samples Put the sample boat into the dry sampler, and use dry rubber stoppers to plug the two ends of the sampler tightly. Under ordinary atmospheric conditions, insert a helium hose with a relative humidity of less than 2% into the air inlet of the sampler at a flow rate of 0.8L / min, open the shut-off valve of the sampler and remove the rubber plug, Align the port of the sampler with the nozzle of the heating tube of the instrument, and push the sample boat into the heating tube from the other port of the sampler with dry tweezers. Set the heating temperature of the instrument to 240°C, set the working time of the instrument to 30min, and adjust the flow rate of the carrier gas to 0.5L / min. After the instr...

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Abstract

The invention relates to a determination method for trace moisture content in positive electrode and negative electrode pole pieces of a lithium battery. The method comprises the following steps: weighing pole pieces with a certain amount of weight, putting the pole pieces into a sample boat and filling the sample boat into a special sampler; and blowing dry protective gas into the sampler and sending the pole pieces into an instrument for measurement. The method provided by the invention only employs a commonly used solid moisture measuring instrument, and the method has the advantages of low determination cost, no use of other chemical reagents, no pollution, simple operation, a short determination time and high determination precision.

Description

technical field [0001] The invention relates to a method for measuring trace moisture, in particular to a method for measuring the trace moisture content in positive and negative electrodes of a lithium battery. Background technique [0002] At present, in the manufacturing process of lithium-ion batteries, the moisture in the pole piece must be strictly controlled. The moisture in the pole piece has a great impact on the lithium-ion battery, mainly causing the following adverse consequences: When the moisture inside the battery will interact with the electrolytic The reaction product is gas and hydrofluoric acid, the gas will cause the battery shell to swell, hydrofluoric acid is a very corrosive acid, it can corrode the metal parts inside the battery, and eventually cause the battery to leak liquid, eventually causing the failure of the lithium battery. At present, most lithium battery manufacturers mainly use the Karl-Fischer method and the weight loss method to determin...

Claims

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Application Information

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IPC IPC(8): G01N5/04
Inventor 刘宇靖马英
Owner 四川鑫唐新能源科技有限公司