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A Brief Discussion on Super Microwave Digestion

2024-08-05 14:23 博澳

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Preface

Lithium iron phosphate batteries have the advantages of high working voltage, large energy density, long cycle life, good safety performance, small self-discharge rate, and no memory effect. They also support stepless expansion, are suitable for large-scale power storage, and have good application prospects in renewable energy power stations, power grid peak shaving, emergency power systems and other fields. Therefore, lithium iron phosphate has become the mainstream choice for many power battery companies (Figure 1) .

The production quality of lithium iron phosphate is mainly affected by material characteristics, production process and quality control. Among them, metal ion impurities will have different degrees of impact on each component. For example, 1) Boehmite used as flame retardants for power batteries have high requirements for material purity. The existence of impurities will cause changes in its crystal structure, affecting the hardness, density, melting point and other physical properties of boehmite, and greatly reduce its performance; 2) In PVDF (polyvinylidene fluoride, positive electrode binder) and its substitute - CMC (carboxymethylcellulose), if the impurities are incompatible with the matrix or are unevenly dispersed, it will lead to internal stress concentration and mechanical properties of the material; or promote its degradation and crosslinking reactions to reduce its thermal stability; 3) Metal impurities have complex and multi-faceted effects on the electrode material. For example, larger metal particles will directly pierce the separator, resulting in short circuits of the positive and negative electrodes, and metal impurities will be deposited on the electrode surface through electrochemical and chemical action, which will greatly affect the safety performance and service life of the battery.

Figure 1 Lithium iron phosphate battery

Therefore, in all aspects of the production of battery modules, accurate detection of metal impurities in raw materials and components is required in a timely manner, providing important guarantees for optimizing production processes, ensuring material and product quality, ensuring production safety and environmental friendliness.

In this work, the Boo Micromate D7 microwave digester ( Figure 2 ) was used to process samples of important components in the battery to verify the processing effect of this type of instrument.

Figure 2 Micromate D7 microwave digester

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Dissolve experimental steps

1. Battery component sample description

Table 1 and Figure 3 show the basic situation of each battery component sample.

Table 1. Characteristics and functions of battery module samples

sample	use	Possible metallic impurities
Boehmite	Battery flame retardant	Ca, Fe, Cu, Na , etc.
PVDF (Polyvinylidene Fluoride)	Positive electrode adhesive ear diaphragm	Fe, Cu, Cr, Ni, Co, Zn, Mn, etc.
APP (Ammonium polyphosphate)	Extreme ear diaphragm	Fe, Ca, Mg, Cu, Cr , etc.
CMC (carboxymethylcellulose)	PVDF alternatives	Fe, Cu, Cr, Ni, Co , etc.
Lithium iron phosphate	Positive electrode material	Na, K, Mg, Mn, Cr, Ni, Cu, Zn, Ti, V, etc.
graphite	Negative electrode material	Fe, Cr, Cu, Ni, Co, Zn, Mn, etc.

Figure 3 Battery assembly sample

2. Brief description of experimental steps

(1) Weigh 0.1 g of different samples into different digestion tanks, be careful not to hang the walls, add an appropriate amount of digestion solution and assemble the can;

(2) After setting up the digestion program on the system, start the digestion work;

(3) The digestion is completed. After the digestion tank is fully cooled, the digestion tank is opened in the fume hood, transfer the digestion solution into the container, and set the volume for subsequent analysis.

III. Results and Discussion

The experiment was conducted with a micromate d7 microwave digester to digest boehmite, PVDF, CMC, APP, lithium iron phosphate and graphite. The samples after digestion were not precipitated and were clear and transparent ( Figure 4 ) , indicating that the sample pretreatment effect of this type of instrument was good.

Figure 4 The appearance of the treated sample

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Introduction to the performance of micromate d7 microwave digester

As an efficient, safe and reliable sample pretreatment instrument, the Boo Micromate D7 microwave digester used in this experiment has many advantages:

1. Equipped with MATE-T wireless full tank temperature monitoring system, it can monitor temperature changes and display the change curve in real time;

2. Equipped with MATE-P wireless full tank pressure monitoring system, it realizes non-contact precision pressure monitoring, and tracks the pressure changes of each sample in real time;

3. The digestion tank adopts an active elastic pressure relief protection design to avoid sample pressure overload;

4. With an intelligent control system, all operations can be easily completed and equipped with multiple security functions, making your digestion work safer, more secure, simple and easy!

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More information about micromate d7 microwave digester

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