WO2016029418A1

WO2016029418A1 - Magnetic controlled metal secondary battery

Info

Publication number: WO2016029418A1
Application number: PCT/CN2014/085476
Authority: WO
Inventors: 孙旭阳
Original assignee: 孙旭阳
Priority date: 2014-08-29
Filing date: 2014-08-29
Publication date: 2016-03-03

Abstract

A magnetic controlled metal secondary battery, comprising a metal secondary battery body and magnetic bodies. The metal secondary battery body comprises a positive plate (2), a negative plate (1), and an electrolyte and a diaphragm (3) which are configured between the positive plate and the negative plate. The magnetic bodies (4a, 4b) are arranged outside the metal secondary battery body and are used for applying a magnetic field to the metal secondary battery body. Under the control of the applied magnetic field, a dendritic crystal phenomenon of a negative electrode during charging and discharging processes of the battery is inhibited, the compactness and uniformity of deposition are good, the consistency of a surface diaphragm is improved, a charging/discharging speed is increased, safety and cycle performances of the magnetic controlled metal secondary battery are improved, and a cycle index of the magnetic controlled metal secondary battery is several times or even hundreds of times higher than that of a common metal secondary battery.

Description

Magnetron metal secondary battery

Technical field

The present invention relates to the field of secondary battery technology, and in particular to a magnetic control metal secondary battery. Background technique

With the rapid development of battery technology, secondary batteries are becoming more and more widely used. The existing secondary batteries can be, for example, lead-acid batteries, lithium-ion batteries, nickel-cadmium batteries, vanadium flow batteries, sodium-sparing batteries, etc. The main secondary batteries are lead-acid batteries and lithium-ion batteries. The former is the chemical battery with the largest usage and the lowest unit energy storage cost; the latter is the battery with the highest cost performance and the fastest growth in the use of high energy density secondary batteries. The anode material of the lithium ion battery is generally composed of graphite, and the cathode material is usually composed of a lithium intercalation compound, for example, LiCo0 ₂ or the like. The negative electrode mainly adopts carbon with special molecular structure. When charging, the potential applied to the two poles of the battery forces the positive electrode compound to release lithium ions, and the negative electrode molecules are arranged in the carbon layer of the lamellar structure; when discharging, the lithium ions are separated from the lamellar structure. Precipitated in carbon, re-embedded into the positive electrode, and electrons flow from the negative electrode to the positive electrode through an external circuit.

For high-performance applications, such as electric vehicles and electronics, lithium-ion batteries still suffer from low energy density and high cost. When the negative electrode material of the secondary battery is a metal or a metal alloy, such as lithium, sodium, magnesium, aluminum or the like, the energy density of the battery is high, and the material cost of the negative electrode and the optional positive electrode is low. For example, the theoretical energy density of a lithium ion battery is 580 wh/kg, and the theoretical energy density of a lithium ion battery is 2600 wh/kg.

However, in the above metal secondary battery, during the charging process, metal ions are difficult to form a face crystal during the crystallization of the negative electrode to form dendrites, wherein the surface crystal means that the shape of the crystal exists in the form of a surface, such as ice; Crystal means that the crystal grows in a dendritic shape, such as a snowflake; the dendrite is easy to pierce the membrane, causing a short circuit between the positive and negative electrodes to cause rapid exotherm or even an explosion. At the same time, the interfacial reaction between dendrites and related non-uniform, inconsistent deposits and electrolyte causes irreversible conversion of the electrode into porous products and chalking. Phenomenon, the effective component of the electrolyte is depleted, and as a result, the battery has poor cycleability and poor safety. This is most evident on lithium metal secondary batteries.

The prior art has not been able to effectively improve the battery safety and cycle problems caused by the dendrite phenomenon and the uneven deposition and inconsistency in the metal secondary battery, particularly the lithium metal secondary battery. Summary of the invention

The present invention can effectively suppress the formation of dendrites and uneven deposits during the cycle of a common metal secondary battery by providing a magnetron-controlled metal secondary battery, thereby improving battery safety and cycle times.

The embodiment of the present application provides a magnetron secondary battery including a metal secondary battery body and a magnetic body, wherein:

The metal secondary battery body includes a positive electrode plate, a negative electrode plate, and an electrolyte and a separator disposed between the positive electrode plate and the negative electrode plate, wherein the negative electrode plate is made of a metal or a metal alloy; a magnetic body disposed outside the metal secondary battery body for applying a magnetic field to the battery body, wherein the number of cycles of the magnetron secondary battery is when the metal secondary battery body is not applied with a magnetic field 2 to 200 times the number of cycles.

Optionally, the magnetron metal comprises lithium metal and lithium alloy, sodium metal and sodium alloy, magnesium metal and magnesium alloy, aluminum metal and aluminum alloy, calcium metal and calcium alloy, zinc metal and zinc alloy, iron metal and iron alloy. And other negative metal and alloy of conventional metal secondary batteries.

Optionally, the magnetic body is composed of one or more materials of a permanent magnet, a soft magnetic and an induction coil.

Optionally, the magnetic body is composed of a permanent magnet.

Optionally, the magnetic body is composed of a permanent magnet and a soft magnetic body.

Optionally, the magnetic body is composed of a soft magnetic and an induction coil. Optionally, the magnetic body is composed of a superconducting magnet.

The magnetron metal secondary battery is formed by stacking a plurality of metal secondary battery bodies and then applying a magnetic body.

The boundary after the magnetic control metal secondary battery is composed of the battery pack is subjected to magnetic focusing and magnetic separation using soft magnetic. More preferably, the magnetron secondary battery incorporates a supercapacitor on the positive and negative plates, such as a carbon material having a high specific surface area.

The magnetic control metal secondary battery improves the safety and cycleability of the battery by using an external magnetic field and a combination of electrolyte modification, diaphragm enhancement, and pulse charging.

In the embodiment of the present invention, the negative electrode plate in the electrode of the metal secondary battery in the technical solution of the present application is made of metal or a metal alloy. Since the energy density of the battery is high, the material and manufacturing cost of the negative electrode and the optional positive electrode are low. The magnetic field, the chemical potential of the system changes, the electrocrystallization process changes, and the electrolyte and interface of the battery are affected by the magnetohydrodynamic effect. These aspects produce synergistic effects, which can effectively inhibit the dendritic phenomenon of the metal negative electrode and make the deposition dense. The uniformity of the surface film, the consistency of the surface film are improved, the charging and discharging speed is accelerated, and finally the safety and the number of cycles of the magnetron metal secondary battery are improved, and the cost is reduced. DRAWINGS

1 is a first structural diagram of a magnetic control metal secondary battery in an embodiment of the present invention;

2 is a second structural diagram of a magnetic control metal secondary battery in an embodiment of the present invention;

3 is a third structural diagram of a magnetic control metal secondary battery in an embodiment of the present invention;

4 is a fourth structural diagram of a magnetic control metal secondary battery in an embodiment of the present invention;

FIG. 5 is a fifth structural diagram of a magnetic control metal secondary battery according to an embodiment of the present invention;

6 is a sixth structural diagram of a magnetron metal secondary battery in an embodiment of the present invention;

7 is a seventh structural diagram of a magnetic control metal secondary battery in an embodiment of the present invention;

8 is an eighth structural diagram of a magnetic control metal secondary battery according to an embodiment of the present invention; The relevant reference numerals in the figure are as follows:

1 negative plate, 2 positive plate, 3 electrolyte and diaphragm, 4a permanent magnet,

4b permanent magnet, 5a soft magnetic, 5b soft magnetic, 6a permanent magnet, 6b permanent magnet, 7 induction coil, 8 induction coil. detailed description

The negative electrode plate in the electrode body in the technical solution of the present application is made of a metal or a metal alloy, and a magnetic field is applied to the outside of the metal secondary battery body to provide a magnetic field, thereby effectively suppressing the occurrence of dendrite in the metal secondary battery. The number of cycles of the magnetron metal secondary battery is several times or even hundreds of times higher than that of the ordinary metal secondary battery. In the case where the battery capacity is equal, the magnetron metal secondary battery in the technical solution of the present application has a smaller volume and a lighter weight than the conventional secondary battery.

The main implementation principles, specific implementation manners, and the corresponding beneficial effects that can be achieved by the technical solutions of the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

An embodiment of the present invention provides a magnetic control metal secondary battery. Referring to FIG. 1 , the magnetic control metal secondary battery is specifically a magnetic control metal secondary battery, including a metal battery body, and the metal battery body includes a negative electrode plate. 1. A positive electrode plate 2, and an electrolyte solution and a separator 3 disposed between the negative electrode plate 1 and the positive electrode plate 2, wherein the separator is impregnated in the electrolyte, and the material of the negative electrode plate 1 is lithium mono- or lithium alloy, and the positive electrode The material of the plate 2 may be sparse or LiCo0 ₂ or the like, and is preferably used as a positive electrode material because the energy density is high and the cost is low. Although the sparseness is an insulator, the positive electrode plate 2 can be prepared by mixing the conductive agent to the sparseness. Further improving the electrical conductivity of the positive electrode plate 2.

Wherein, the separator may be an ultrafine glass fiber and a composite film thereof with PP and PE, and the thickness may be, for example, 0.1 mm, 0.5 mm, 1 mm or 2 mm, etc., so that the thickness of the separator is a separator of the existing lithium ion battery. Several times, even tens of times, the diaphragm has electronic insulation to ensure mechanical isolation of the positive and negative plates; at the same time, it has a certain pore size and porosity, guarantees low resistance and high ionic conductivity, and has lithium ion Very good transparency. Preferably, the membrane is made of glass fiber because the glass fiber has better wettability, good mechanical properties and lower cost for the electrolyte. Since the theoretical energy density of metallic lithium is, for example, 3860 Ah/kg, and the negative electrode material in the conventional lithium ion secondary battery is exemplified by graphite, the energy density is about 370 Ah/kg, so that the energy density of the negative electrode material in the embodiment of the present application is It is more than 10 times the energy density of the negative electrode material of the conventional lithium ion secondary battery, and the manufacturing cost of the lithium single alloy and the alloy unit is much lower than that of the conventional negative electrode material. In the case where the battery capacity is equal, the magnetron metal secondary battery in the technical solution of the present application has a smaller volume, a lighter weight, a higher energy density, and a higher cost than the existing lithium ion secondary battery. low.

In addition, there is a wide space for the selection of a positive electrode material for a lithium metal secondary battery. The lithium-ion positive electrode material corresponding to the lithium ion negative electrode, such as LiCo0 _{2 , has} an energy density of 155 Ah/kg, and the energy density of LiFeP0 ₄ is 160 Ah/kg. Since the lithium metal secondary battery can also be used as a positive electrode material, the energy density is sparse. It is 1675 Ah/kg, and the cost is extremely low. When the battery capacity is equal, the magnetron metal secondary battery in the technical solution of the present application has a larger volume than the existing lithium ion secondary battery. Small, lighter weight, higher energy density and lower cost. Further, referring to FIG. 1, the magnetron metal secondary battery includes a magnetic body disposed outside the metal secondary battery body for applying a magnetic field to the metal secondary battery body, the magnetic body being Yong The magnets 4a and 4b are composed, and the straight line with an arrow in Fig. 1 is used to display the direction of the magnetic field of the permanent magnets 4a and 4b, and the arrow indicates the S pole to the N pole.

Of course, the configuration of the magnetic field generated by the magnetic body and the direction of the electric field of the battery may be parallel (B〃E), and the magnetic directions of the permanent magnet pair 4a and the permanent magnet 4b remain the same. Referring specifically to Fig. 2, the permanent magnet 4a is disposed on the side of the negative electrode plate 1, and the permanent magnet 4b is disposed on the side of the positive electrode plate 2, and the arrangement of the magnetic field direction of the permanent magnet 4a and the permanent magnet 4b and the direction of the electric field of the battery are parallel (B〃E). And the magnetic directions of the permanent magnet pair 4a and the permanent magnet 4b remain the same.

Further, the magnetic body may be composed of one or more materials of a permanent magnet, a soft magnetic, an induction coil, and a superconducting magnet, which is not specifically limited in the present application.

Specifically, the magnetic body is composed of soft magnetic and permanent magnets. Referring to FIG. 3, permanent magnets 4a, permanent magnets 4b, and permanent magnets 4a are disposed on the upper portion of the metal secondary battery body, respectively. a soft magnetic 5a between the permanent magnets 4b, and a permanent magnet 6a, a permanent magnet 6b, and a soft magnetic 5b disposed between the permanent magnet 6a and the permanent magnet 6b, respectively, in the lower portion of the metal secondary battery body, such that The permanent magnet 4a, the permanent magnet 4b and the soft magnetic 5a form a combination, and the other combination of the permanent magnet 6a, the permanent magnet 6b and the soft magnetic 5b, wherein the permanent magnet 4a and the permanent magnet 4b constitute the first permanent magnet pair, The second permanent magnet pair is composed of the permanent magnet 6a and the permanent magnet 6b, and the magnetic polarities of the two permanent magnets of the first and second permanent magnet pairs are opposite to each other, and more magnetic flux enters the battery after soft magnetic field generation. Higher magnetic field strength (so-called "magnet parallel" mode), which makes the magnetron effect better. In this example, the direction of the magnetic field in the battery is perpendicular to the direction of the electric field (B丄E;).

Of course, the direction of the magnetic field in the battery and the direction of the electric field may be parallel (B〃E). Referring to FIG. 4, a permanent magnet 4a, a permanent magnet 4b, and a permanent magnet 4a are respectively disposed at the front end of the metal secondary battery body. a soft magnetic 5a between the permanent magnet 4b and a permanent magnet 6a, a permanent magnet 6b, and a soft magnetic 5b disposed between the permanent magnet 6a and the permanent magnet 6b, respectively, at the rear end of the metal secondary battery body, And the magnetic polarities of the two permanent magnets in the pair of first and second permanent magnets are opposite to each other, and more magnetic flux enters the battery after soft magnetic field to generate a higher magnetic field strength (ie, a so-called "magnet parallel" mode) , so that the magnetic control effect is better. In this example, the direction of the magnetic field in the battery is parallel to the direction of the electric field.

Specifically, the magnetic body is exemplified by an induction coil and a soft magnetic. Referring to FIG. 5, a soft magnetic 5a is disposed on an upper portion of the metal secondary battery body, and a coil 7 is wound around the outer periphery of the soft magnetic 5a. The lower part of the secondary battery body is provided with soft magnetic 5b, and the coil 8 is wound around the outer periphery of the soft magnetic 5b to constitute a standard electromagnet, and an external magnetic source is used to generate an induced magnetic field, and the magnitude of the magnetic field can be controlled. In this embodiment, the direction of the magnetic field is perpendicular to the direction of the electric field (B 丄 E), wherein the coil 7 and the coil 8 are both induction coils.

Similarly, referring to FIG. 6, a soft magnetic 5a is disposed at the front end of the metal secondary battery body, and the coil 7 is wound around the outer periphery of the soft magnetic 5a; a soft magnetic 5b is disposed at the rear end of the metal secondary battery body, and the coil 8 is provided. Wound around the outer periphery of the soft magnetic 5b, the standard electromagnets are placed on both sides of the positive and negative plates so that the direction of the magnetic field is parallel to the direction of the electric field (B〃E). For example, the magnetic body pairs of opposite polarities are respectively juxtaposed on the battery plate side. Referring to FIG. 7, permanent magnets 4a and permanent magnets 4b are respectively disposed at the front ends of the metal secondary battery bodies, and The rear end of the secondary battery body is respectively provided with a permanent magnet 6a and a permanent magnet 6b, wherein the permanent magnet 4b is disposed at a lower portion of the permanent magnet 4a, and the permanent magnet 6b is disposed at a lower portion of the permanent magnet 6a, so that the permanent magnet 4a and the permanent magnet 4b are composed The first permanent magnet pair and the second permanent magnet pair composed of the permanent magnet 6a and the permanent magnet 6b generate a control magnetic field in the vicinity of the positive and negative plates, wherein a magnetic field direction of the control magnetic field is generated in the vicinity of the positive and negative plates As shown by the curves in the electrolyte and diaphragm 3.

The following is an example in which the magnetic bodies of opposite polarities are juxtaposed on the negative side of the battery. Referring to FIG. 8, permanent magnets 4a and permanent magnets 4b are respectively disposed at the front ends of the metal secondary battery bodies, and the permanent magnets 4a and permanent magnets are respectively provided. The magnetic field of 4b is opposite in direction, and the first permanent magnet pair composed of the permanent magnet 4a and the permanent magnet 4b generates a control magnetic field in the vicinity of the negative electrode plate 1, and no control magnetic field is applied to the positive electrode plate 2 to save magnet use.

Similarly, the magnetron secondary battery includes the reverse direction of the magnetic field directions of Figs. 1, 2, 3, 4, 7, and 8.

Further, the magnetron secondary battery includes all of the permanent magnets of the above battery of Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 7, Fig. 8 replaced with a superconducting magnet.

Because the dendrites will pierce the diaphragm, causing short circuit, overheating, and even fire and explosion, the magnetic control battery can improve the safety of the battery while suppressing dendrites. At the same time, due to the repeated charge and discharge of the existing lithium secondary battery, the reaction between the lithium crystal and the electrolyte necessarily forms a Solid Electrolyte Interphase (SEI) film, and the formation process of the lithium electrode SEI film is actually the original surface film of the metal lithium and The process in which the electrolyte reacts chemically to produce different precipitated products. Due to dendritic formation, and uneven deposition, repeated dissolution and interfacial reaction during lithium electrode cycling, the lithium electrode irreversibly transforms from a dense metal to a porous product, similar to the loose structure of rust, making the metal lithium and electrolyte in the electrode The active component in the reaction is continuously reacted to complete collapse failure, and experiments have shown that, for example, Carmen ML ό pez, Argonne National Laboratory, USA The team's research on the interface morphology of lithium negative electrode surface confirmed that the surface morphology of lithium negative electrode changed from flat and dense to a carpet structure with obvious multilayer: the top layer is a dendritic layer formed by lithium dendrites, and the middle porous layer is metal and The loose structure caused by the electrolyte reaction, the bottom layer is an unreacted dense metal lithium layer, so that the interfacial reaction between lithium and the electrolyte leads to the continuous expansion of the porous layer, and finally the entire lithium electrode is converted into a loose porous reaction product, partially insoluble precipitates. After the powdering, it falls into the electrolyte to form so-called dead lithium. On the other hand, the effective component of the electrolyte is depleted. As a result, the lithium battery is completely ineffective, and the number of cycles of the secondary battery is lowered.

According to the existing experimental data, it is found that, for example, by electrodeposition of lithium under a magnetic field of B丄E (B=1T), after the application of the magnetic field, the liquid phase is enhanced by the MHD effect, resulting in a smoother surface of the deposited layer. The hole defects are greatly reduced, so that the probability of occurrence of uneven level in the magnetron-controlled lithium secondary battery of the present application decreases during charging and discharging, and the number of cycles of the magnetron-controlled lithium secondary battery increases.

Moreover, using Monte-Carlo simulation, a model describing the growth of various metal and alloy electrodeposited dendrites under the action of a steady magnetic field is given. The model takes into account the applied magnetic field, the concentration of the electrolyte and the probability of ions undergoing reduction at the cathode. By the influence of other factors, the simulation shows the dendrite growth diagram consistent with the experimental results. The simulation shows that the shape of the clusters and their fractal dimension are both strong and weak with the applied magnetic field B, that is, the angular velocity of the ions reflected in the model. Size dependent; as the magnetic field strength increases, the sedimentary cluster will change from fractal (corresponding to "dendrites") to non-fractal (corresponding to "face crystals"); under relatively strong applied magnetic fields, at higher ion concentrations The sediment is non-fractal; the smaller the reaction probability of ions at the cathode, the more easily the dendritic growth tends to be non-fractal with the increase of the magnetic field strength, which reduces the probability of dendrite generation and increases the probability of surface crystal generation.

Preliminary experiments show that the lithium metal secondary battery is inhibited by the stronger magnetic field, and the cycle performance is improved. When the magnetic field strength (B) is 0.3T (Tesla), the number of cycles is 1.5 times that of the non-magnetic field; at 0.8T, the number of cycles is 10 times that of the non-magnetic field; when it is greater than or equal to 1.2T, the number of cycles is not 200 times or more of the applied magnetic field, no dendrite piercing was observed before the lithium metal secondary battery failed Diaphragm phenomenon.

In addition, the sodium metal and the sodium alloy of the negative electrode of the magnetron metal secondary battery were tested on the sodium metal by the same experimental method as in the above embodiment, and the experiment showed that the cycle performance of the magnetron controlled metal sodium secondary battery under the action of the magnetic field Improved, when the magnetic field strength is greater than 1.2T, the number of cycles is more than 5 times that of the non-magnetic field. For the observation of the sodium negative electrode material under the same cycle, the dendrite and the deposition are compared with the non-application of the magnetic field. Sex, compactness and consistency have been greatly improved.

In addition, the magnesium metal and the magnesium alloy of the negative electrode of the magnetron metal secondary battery are tested on the magnesium metal by the same experimental method as in the above embodiment, and the experiment shows that the cycle performance of the magnetron controlled magnesium metal secondary battery under the action of the magnetic field Improved, when the magnetic field strength is greater than 1.3T, the number of cycles is more than 2.5 times that of the non-magnetic field. For the observation of the magnesium negative electrode material under the same cycle, the dendrite and the deposition are both compared with the non-application of the magnetic field. Sex, compactness and consistency have been greatly improved.

In addition, the aluminum alloy and the aluminum alloy of the negative electrode of the magnetron metal secondary battery are tested on the aluminum metal by the same experimental method as in the above embodiment, and the experiment shows that the cycle performance of the magnetron metal aluminum secondary battery under the action of the magnetic field Improved, when the magnetic field strength is greater than 1.6T, the number of cycles is more than twice that of the non-magnetic field. For the aluminum negative electrode material under the same cycle, the dendrite and the deposition are compared compared with the non-application of the magnetic field. Sex, compactness and consistency have been greatly improved.

In addition, the calcium metal and the calcium alloy of the negative electrode of the magnetron metal secondary battery are tested on the calcium metal by the same experimental method as in the above embodiment, and the experiment shows that the cycle performance of the magnetron metal calcium secondary battery under the action of the magnetic field Improved, when the magnetic field strength is greater than 1.2T, the number of cycles is twice that of the non-magnetic field. For the observation of the calcium negative electrode material under the same cycle, the dendrite and deposition are compared compared with the non-application of the magnetic field. , compactness and consistency have been greatly improved.

In addition, the zinc metal and the zinc alloy of the negative electrode of the magnetron metal secondary battery are tested on the zinc metal by the same experimental method as in the above embodiment, and the experiment shows that the cycle performance of the magnetron controlled metal zinc secondary battery under the action of a magnetic field Improved, when the magnetic field strength is greater than 1.0T, the number of cycles is not added When the magnetic field is 10 times or more, it is possible to observe the uniformity, compactness, and uniformity of dendrites and deposition as compared with the case where no magnetic field is applied to the zinc negative electrode material in the same cycle.

In addition, the iron metal of the negative electrode of the magnetron metal secondary battery and the iron alloy are tested by the same experimental method as in the above embodiment, and the experiment shows that the cycle performance of the magnetron controlled metal secondary battery is obtained under the action of a magnetic field. Improvement, when the magnetic field strength is greater than 1.2T, the number of cycles is more than three times that of the non-magnetic field. For the observation of the iron negative electrode material under the same cycle, the dendrite and deposition are compared compared with the non-application of the magnetic field. , compactness and consistency have been greatly improved.

Further, the negative electrode metal of the magnetron secondary battery further includes a negative electrode metal of another conventional metal secondary battery.

Beneficial effects:

In the solution of the present invention, the magnetron secondary battery is composed of a conventional metal secondary battery and an external magnetic body. Under the action of external magnetic field, the dendrite phenomenon of the negative electrode is well suppressed during the charging and discharging of the conventional metal secondary battery, because the dendrite will pierce the diaphragm and cause a short circuit, which will cause serious heat release and even fire and explosion, and dendrites and The interaction of the SEI membrane phenomenon causes unevenness of the negative electrode deposit after the battery is circulated, is not dense, is inconsistent, causes loosening of the negative electrode, pulverizes, and causes the exhaustion of the effective component of the electrolyte to cause the battery to fail; thus, according to the solution of the present invention, The safety and cycleability of the battery is greatly improved.

In addition, the metal and metal alloy as the negative electrode material of the battery have higher energy density (up to 10 times or more) and lower cost (lowest to ten) than other negative electrode materials such as lithium negative electrode and negative electrode material of lithium ion battery. In one case, the magnetron metal secondary battery has higher energy density, lower cost, smaller volume, and lighter weight than the existing secondary battery.

In addition, lithium metal and lithium alloy are used as the anode material, and the cathode material of the lithium secondary battery has a wide application space, such as an optional energy density higher than that of the existing cathode material (such as LiCo0 ₂ , ternary or lithium iron phosphate) 10 times. In addition to the energy density advantages of the above-mentioned sparse electrode, the modified electrode is extremely rich in resources, extremely low in price, and has a cost advantage of several tens of times. Therefore, a magnetron lithium metal secondary battery and Compared with the existing secondary battery, the energy density is higher, the cost is lower, the volume is smaller, and the weight is lighter.

Although the addition of magnetic materials results in an increase in volume, quantity, and cost, the benefits of improved magnetic properties (materials) such as NdFeB will largely offset the corresponding increase.

The magnetic control method of the invention can be widely applied to various metal secondary batteries due to its principle and mechanism consistency, including but not limited to lithium, sodium, magnesium, aluminum, calcium, zinc, iron and other all conventional metals. Secondary battery.

In addition, after proper matching of the positive and negative electrode materials and the electrolyte, after the magnetic field is applied and a certain intensity is reached, the charge and discharge rate of the battery is significantly improved, and thus the magnetron metal secondary battery is compared with the existing secondary battery. , higher power density and faster charging.

In addition, the battery of the present invention can adopt a larger scale (refer to the positive and negative plates, the thickness of the separator, etc.): It is preferable to adopt a more rigid structure, whereby the magnetron metal secondary battery is compared with the existing secondary battery, the battery The safety, environmental adaptability and robustness of the group will increase.

In summary, the magnetron metal secondary battery of the technical solution of the present invention has obvious advantages in terms of safety, cycle, energy density, power density, cost, and resource abundance of the secondary battery. Improvements can be applied to a wide range of energy storage applications, including power batteries (cars, boats, aircraft, etc.), bringing revolutionary changes to the energy use structure.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these professionals skilled in the art of the present embodiments will be apparent, and the generic principles defined herein may be made without departing from the spirit or scope of the _invention: implemented in other embodiments. Accordingly, the present invention will not be limited to the embodiments shown _herein: but is to be accorded consistent with the principles disclosed herein, and novel features of the broadest range.

Claims

Rights request

A magnetron secondary battery comprising a metal secondary battery body and a magnetic body, wherein:

The metal secondary battery body includes a positive electrode plate, a negative electrode plate, and an electrolyte and a separator disposed between the positive electrode plate and the negative electrode plate, wherein the negative electrode plate is made of a metal or a metal alloy; a magnetic body disposed outside the metal secondary battery body for applying a magnetic field to the metal secondary battery body, the number of cycles of the magnetron secondary battery being that the metal secondary battery body is not applied The number of cycles in the magnetic field is 2 to 200 times.

2. The magnetron metal secondary battery according to claim 1, wherein the negative electrode metal comprises lithium metal and lithium alloy, sodium metal and sodium alloy, magnesium metal and magnesium alloy, aluminum metal and aluminum alloy, calcium. Anode metals and alloys of metals and calcium alloys, zinc and zinc alloys, iron and iron alloys, and all other conventional metal secondary batteries.

The magnetron secondary battery according to claim 2, wherein the magnetic body is composed of one or more of a permanent magnet, a soft magnetic, a superconducting magnet, and an induction coil.

The magnetron secondary battery according to claim 3, wherein the magnetic body is composed of a permanent magnet.

The magnetron secondary battery according to claim 3, wherein the magnetic body is composed of a permanent magnet and a soft magnetic material.

The magnetron secondary battery according to claim 3, wherein the magnetic body is composed of a soft magnetic material and an induction coil.

The magnetron secondary battery according to claim 3, wherein the magnetic body is composed of a superconducting magnet.