Disclosure of Invention
The invention mainly aims to provide a super-capacity graphene battery which has high theoretical specific capacity, good electrochemical stability, excellent high and low temperature resistance and excellent use safety. Meanwhile, the second purpose of the invention is to provide a preparation method of the lithium metal graphene battery, which has the advantages of simple process, small dependence on equipment, high preparation efficiency and suitability for continuous production.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
the super-capacity graphene battery is characterized in that a positive electrode material of the lithium metal graphene battery is a nitrogen-doped nickel-cobalt-manganese-graphene-based compound; the cathode material of the lithium metal graphene battery is a titanium dioxide quantum dot/metal lithium/fullerene compound; the diaphragm of the lithium metal graphene battery is prepared from the following components in parts by weight: 50-60 parts of hyperbranched polyborosiloxane containing epoxy groups, 10-15 parts of melamine and 8-10 parts of nano calcium carbonate.
Preferably, the nitrogen-doped nickel-cobalt-manganese-graphene-based composite is a mixture formed by uniformly mixing a nitrogen-doped nickel-cobalt-manganese ternary material and graphene according to a mass ratio of (3-5): 1.
Preferably, the nitrogen-doped nickel-cobalt-manganese ternary material is prepared according to the method of example 1 in chinese patent document CN 107565127B.
Preferably, the titanium dioxide quantum dot/metallic lithium/fullerene compound is a mixture formed by uniformly mixing the titanium dioxide quantum dot, the metallic lithium and the fullerene according to the mass ratio of 1 (4-6) to (0.3-0.6).
Preferably, the titanium dioxide quantum dots are prepared according to the method of example 1 in chinese patent document CN 108906013A.
Preferably, the electrolyte of the lithium metal graphene battery is a lithium hexafluorophosphate solution with the concentration of 0.8-1.2 mol/L.
Preferably, the solvent of the lithium hexafluorophosphate solution is a mixture formed by mixing ethylene carbonate and diethyl carbonate according to the mass ratio of 1 (3-5).
Preferably, the epoxy group-containing hyperbranched polyborosiloxane is prepared according to the method of example 1 in Chinese patent document CN 107868252B.
Preferably, the particle size of the nano calcium carbonate is 200-500 nm.
A second object of the present invention is to provide a method for preparing the lithium metal graphene battery, which includes the following steps:
step S1, uniformly mixing titanium dioxide quantum dot/metal lithium/fullerene compound, conductive agent Super P and polyvinylidene fluoride PVDF according to the mass ratio of 8:1:1, then dripping N-methyl pyrrolidone into the mixture, uniformly stirring the mixture to form viscous pasty viscous liquid, then uniformly coating the viscous liquid on copper foil through a coating machine, and compacting the viscous liquid until the coating surface density is 160-2Compacted density of 2.0-2.8g/cm3(ii) a Then continuously slitting and continuously rolling to obtain a positive pole piece;
step S2, uniformly mixing titanium dioxide quantum dot/metal lithium/fullerene compound, conductive agent Super P and PVDF according to the mass ratio of 8:1:1, then dripping N-methyl pyrrolidone into the mixture, uniformly stirring the mixture into viscous uniform stable slurry by using double-planet vacuum high-speed stirring equipment, and then stably and uniformly coating the prepared slurry on the surface of copper foil by using an extrusion type double-sided coating machine, wherein the coating surface density is 150-2The compacted density is 1.5-1.8g/cm3(ii) a Then continuously slitting and continuously rolling to obtain a negative pole piece;
step S3, uniformly mixing hyperbranched polyborosiloxane containing epoxy groups, melamine and nano calcium carbonate according to a weight ratio, carrying out melt extrusion and heat setting processes, then placing the mixture in a hydrochloric acid solution with a mass percentage concentration of 9-12% for soaking for 3-6 hours, taking out the mixture, washing the mixture for 3-6 times with water, finally placing the mixture in a vacuum drying oven at 90-95 ℃ for drying to constant weight, and finally obtaining the diaphragm;
and S4, assembling and injecting liquid to obtain the lithium metal graphene battery.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
(1) according to the preparation method of the lithium metal graphene battery, provided by the invention, the conventional process route and production equipment are adopted, the capital investment is low, the original production line is not required to be modified, the preparation efficiency is high, and the preparation method is suitable for continuous production;
(2) according to the lithium metal graphene battery provided by the invention, the nitrogen-doped nickel-cobalt-manganese-graphene-based composite is used as a positive electrode material, the advantages of nitrogen-doped nickel-cobalt-manganese and graphene are combined, and the nitrogen-doped nickel-cobalt-manganese and graphene are mutually matched, so that the stability of the lithium metal graphene battery can be ensured under the combined action, the chargeability of the lithium metal graphene battery can be improved, the electrochemical performance of the lithium metal graphene battery is excellent, and the safety performance, the cycle performance and the low temperature resistance of the lithium metal graphene battery are good;
(3) according to the lithium metal graphene battery provided by the invention, the cathode material of the lithium metal graphene battery is a titanium dioxide quantum dot/metal lithium/fullerene compound, and through mutual cooperation and combined action of all components, the conductivity can be improved, so that the transmission and electron migration of lithium ions in the charging and discharging processes are enhanced, and the capacity retention rate and the electrochemical properties of multiplying power, circulation and the like of the material are obviously improved; the reversibility in the electrochemical process can be improved, and the problem of volume expansion generated in the lithium extraction and insertion process can be effectively relieved;
(4) the diaphragm of the lithium metal graphene battery provided by the invention is prepared from the following components in parts by weight: 50-60 parts of hyperbranched polyborosiloxane containing epoxy groups, 10-15 parts of melamine and 8-10 parts of nano calcium carbonate; the hyperbranched polyborosiloxane containing epoxy groups can perform an epoxy ring-opening reaction with amino groups on melamine to form a three-dimensional network structure, so that the comprehensive performance of the film is effectively improved; the formed membrane material has high melting point and good thermal stability, and the wettability of the diaphragm on electrolyte can be improved by hydroxyl groups formed by epoxy ring-opening reaction, so that the battery can be prevented, and the service life of the battery can be effectively prolonged;
(5) according to the lithium metal graphene battery provided by the invention, through the cooperation and interaction of the battery anode material, the battery cathode material, the diaphragm and the electrolyte, the prepared battery lithium metal graphene battery has the advantages of high theoretical specific capacity, good electrochemical stability, excellent high and low temperature resistance and excellent use safety.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
Example 1
The super-capacity graphene battery is characterized in that a positive electrode material of the lithium metal graphene battery is a nitrogen-doped nickel-cobalt-manganese-graphene-based compound; the cathode material of the lithium metal graphene battery is a titanium dioxide quantum dot/metal lithium/fullerene compound; the diaphragm of the lithium metal graphene battery is prepared from the following components in parts by weight: 50 parts of hyperbranched polyborosiloxane containing epoxy groups, 10 parts of melamine and 8 parts of nano calcium carbonate.
The nitrogen-doped nickel-cobalt-manganese-graphene-based composite is a mixture formed by uniformly mixing a nitrogen-doped nickel-cobalt-manganese ternary material and graphene according to a mass ratio of 3: 1; the nitrogen-doped nickel-cobalt-manganese ternary material is prepared according to the method of the embodiment 1 in the Chinese patent document CN 107565127B.
The titanium dioxide quantum dot/metal lithium/fullerene compound is a mixture formed by uniformly mixing titanium dioxide quantum dots, metal lithium and fullerene according to the mass ratio of 1:4: 0.3; the titanium dioxide quantum dots are prepared according to the method of example 1 in Chinese patent document CN 108906013A.
The electrolyte of the lithium metal graphene battery is a lithium hexafluorophosphate solution with the concentration of 0.8 mol/L; the solvent of the lithium hexafluorophosphate solution is a mixture formed by mixing ethylene carbonate and diethyl carbonate according to the mass ratio of 1: 3; the hyperbranched polyborosiloxane containing the epoxy group is prepared according to the method of example 1 in Chinese patent document CN 107868252B; the particle size of the nano calcium carbonate is 200 nm.
The preparation method of the lithium metal graphene battery is characterized by comprising the following steps:
step S1, uniformly mixing titanium dioxide quantum dot/metal lithium/fullerene compound, conductive agent Super P and polyvinylidene fluoride PVDF according to the mass ratio of 8:1:1, then dripping N-methyl pyrrolidone into the mixture, uniformly stirring the mixture to form viscous pasty viscous liquid, then uniformly coating the viscous liquid on copper foil through a coating machine, and then compacting the copper foil, wherein the coating surface density is 160g/m2Compacted density of 2.0g/cm3(ii) a Then continuously slitting and continuously rolling to obtain a positive pole piece;
step S2, uniformly mixing titanium dioxide quantum dot/metal lithium/fullerene compound, conductive agent Super P and PVDF according to the mass ratio of 8:1:1, then dripping N-methyl pyrrolidone into the mixture, uniformly stirring the mixture into viscous uniform stable slurry by using double-planet vacuum high-speed stirring equipment, and then stably and uniformly coating the prepared slurry on the surface of copper foil by using an extrusion type double-sided coating machine, wherein the coating surface density is 150g/m2Compacted density 1.5g/cm3(ii) a Then continuously slitting and continuously rolling to obtain a negative pole piece;
step S3, uniformly mixing hyperbranched polyborosiloxane containing epoxy groups, melamine and nano calcium carbonate according to a weight ratio, carrying out melt extrusion and heat setting processes, then placing the mixture in a hydrochloric acid solution with a mass percentage concentration of 9% for soaking for 3 hours, then taking out the mixture, washing the mixture for 3 times with water, finally placing the mixture in a vacuum drying oven at 90 ℃ for drying until the weight is constant, and finally obtaining the diaphragm;
and S4, assembling and injecting liquid to obtain the lithium metal graphene battery.
Example 2
The super-capacity graphene battery is characterized in that a positive electrode material of the lithium metal graphene battery is a nitrogen-doped nickel-cobalt-manganese-graphene-based compound; the cathode material of the lithium metal graphene battery is a titanium dioxide quantum dot/metal lithium/fullerene compound; the diaphragm of the lithium metal graphene battery is prepared from the following components in parts by weight: 53 parts of hyperbranched polyborosiloxane containing epoxy groups, 11 parts of melamine and 8.5 parts of nano calcium carbonate.
The nitrogen-doped nickel-cobalt-manganese-graphene-based composite is a mixture formed by uniformly mixing a nitrogen-doped nickel-cobalt-manganese ternary material and graphene according to the mass ratio of 3.5: 1; the nitrogen-doped nickel-cobalt-manganese ternary material is prepared according to the method of the embodiment 1 in the Chinese patent document CN 107565127B.
The titanium dioxide quantum dot/metallic lithium/fullerene compound is a mixture formed by uniformly mixing titanium dioxide quantum dots, metallic lithium and fullerene according to the mass ratio of 1:4.5: 0.4; the titanium dioxide quantum dots are prepared according to the method of example 1 in Chinese patent document CN 108906013A.
The electrolyte of the lithium metal graphene battery is a lithium hexafluorophosphate solution with the concentration of 0.9 mol/L; the solvent of the lithium hexafluorophosphate solution is a mixture formed by mixing ethylene carbonate and diethyl carbonate according to the mass ratio of 1: 3.5.
The hyperbranched polyborosiloxane containing the epoxy group is prepared according to the method of example 1 in Chinese patent document CN 107868252B; the particle size of the nano calcium carbonate is 300 nm.
The preparation method of the lithium metal graphene battery is characterized by comprising the following steps:
step S1, uniformly mixing titanium dioxide quantum dot/metal lithium/fullerene compound, conductive agent Super P and polyvinylidene fluoride PVDF according to the mass ratio of 8:1:1, then dripping N-methyl pyrrolidone into the mixture, uniformly stirring the mixture to form viscous pasty viscous liquid, then uniformly coating the viscous liquid on copper foil through a coating machine, and compacting the copper foil, wherein the coating surface density is 180g/m2Compacted density 2.2g/cm3(ii) a Then continuously slitting and continuously rolling to obtain a positive pole piece;
step S2, uniformly mixing the titanium dioxide quantum dot/metal lithium/fullerene compound, the conductive agent Super P and PVDF according to the mass ratio of 8:1:1, then dripping N-methyl pyrrolidone into the mixture, and using a double-planet vacuum high-speed mixer to mix the mixtureStirring the mixture evenly by a stirring device to form viscous uniform and stable slurry, and then stably and uniformly coating the prepared slurry on the surface of the copper foil by adopting an extrusion type double-sided coating machine, wherein the coating surface density is 170g/m2Compacted density 1.6g/cm3(ii) a Then continuously slitting and continuously rolling to obtain a negative pole piece;
step S3, uniformly mixing hyperbranched polyborosiloxane containing epoxy groups, melamine and nano calcium carbonate according to a weight ratio, carrying out melt extrusion and heat setting processes, then placing the mixture in a hydrochloric acid solution with a mass percentage concentration of 10% for soaking for 4 hours, then taking out the mixture, washing the mixture for 4 times with water, finally placing the mixture in a vacuum drying oven at 92 ℃ for drying until the weight is constant, and finally obtaining the diaphragm;
and S4, assembling and injecting liquid to obtain the lithium metal graphene battery.
Example 3
The super-capacity graphene battery is characterized in that a positive electrode material of the lithium metal graphene battery is a nitrogen-doped nickel-cobalt-manganese-graphene-based compound; the cathode material of the lithium metal graphene battery is a titanium dioxide quantum dot/metal lithium/fullerene compound; the diaphragm of the lithium metal graphene battery is prepared from the following components in parts by weight: 55 parts of hyperbranched polyborosiloxane containing epoxy groups, 13 parts of melamine and 9 parts of nano calcium carbonate.
The nitrogen-doped nickel-cobalt-manganese-graphene-based composite is a mixture formed by uniformly mixing a nitrogen-doped nickel-cobalt-manganese ternary material and graphene according to a mass ratio of 4: 1; the nitrogen-doped nickel-cobalt-manganese ternary material is prepared according to the method of the embodiment 1 in the Chinese patent document CN 107565127B.
The titanium dioxide quantum dot/metal lithium/fullerene compound is a mixture formed by uniformly mixing titanium dioxide quantum dots, metal lithium and fullerene according to the mass ratio of 1:5: 0.45; the titanium dioxide quantum dots are prepared according to the method of example 1 in Chinese patent document CN 108906013A.
The electrolyte of the lithium metal graphene battery is a lithium hexafluorophosphate solution with the concentration of 1 mol/L; the solvent of the lithium hexafluorophosphate solution is a mixture formed by mixing ethylene carbonate and diethyl carbonate according to the mass ratio of 1: 4; the hyperbranched polyborosiloxane containing the epoxy group is prepared according to the method of example 1 in Chinese patent document CN 107868252B; the particle size of the nano calcium carbonate is 350 nm.
The preparation method of the lithium metal graphene battery is characterized by comprising the following steps:
step S1, uniformly mixing titanium dioxide quantum dot/metal lithium/fullerene compound, conductive agent Super P and polyvinylidene fluoride PVDF according to the mass ratio of 8:1:1, then dripping N-methyl pyrrolidone into the mixture, uniformly stirring the mixture to form viscous pasty viscous liquid, then uniformly coating the viscous liquid on copper foil through a coating machine, and then compacting the copper foil, wherein the coating surface density is 210g/m2Compacted density of 2.5g/cm3(ii) a Then continuously slitting and continuously rolling to obtain a positive pole piece;
step S2, uniformly mixing titanium dioxide quantum dot/metal lithium/fullerene compound, conductive agent Super P and PVDF according to the mass ratio of 8:1:1, then dripping N-methyl pyrrolidone into the mixture, uniformly stirring the mixture into viscous uniform stable slurry by using double-planet vacuum high-speed stirring equipment, and then stably and uniformly coating the prepared slurry on the surface of copper foil by using an extrusion type double-sided coating machine, wherein the coating surface density is 190g/m2Compacted density 1.65g/cm3(ii) a Then continuously slitting and continuously rolling to obtain a negative pole piece;
step S3, uniformly mixing hyperbranched polyborosiloxane containing epoxy groups, melamine and nano calcium carbonate according to a weight ratio, carrying out melt extrusion and heat setting processes, then placing the mixture in a hydrochloric acid solution with a mass percentage concentration of 10.5% for soaking for 5 hours, then taking out the mixture, washing the mixture for 5 times with water, finally placing the mixture in a vacuum drying oven at 93 ℃ for drying until the weight is constant, and finally obtaining the diaphragm;
and S4, assembling and injecting liquid to obtain the lithium metal graphene battery.
Example 4
The super-capacity graphene battery is characterized in that a positive electrode material of the lithium metal graphene battery is a nitrogen-doped nickel-cobalt-manganese-graphene-based compound; the cathode material of the lithium metal graphene battery is a titanium dioxide quantum dot/metal lithium/fullerene compound; the diaphragm of the lithium metal graphene battery is prepared from the following components in parts by weight: 58 parts of hyperbranched polyborosiloxane containing epoxy groups, 14 parts of melamine and 9.5 parts of nano calcium carbonate.
The nitrogen-doped nickel-cobalt-manganese-graphene-based composite is a mixture formed by uniformly mixing a nitrogen-doped nickel-cobalt-manganese ternary material and graphene according to a mass ratio of 4.5: 1; the nitrogen-doped nickel-cobalt-manganese ternary material is prepared according to the method of the embodiment 1 in the Chinese patent document CN 107565127B.
The titanium dioxide quantum dot/metallic lithium/fullerene compound is a mixture formed by uniformly mixing titanium dioxide quantum dots, metallic lithium and fullerene according to the mass ratio of 1:5.5: 0.55; the titanium dioxide quantum dots are prepared according to the method of example 1 in Chinese patent document CN 108906013A; the electrolyte of the lithium metal graphene battery is a lithium hexafluorophosphate solution with the concentration of 1.1 mol/L; the solvent of the lithium hexafluorophosphate solution is a mixture formed by mixing ethylene carbonate and diethyl carbonate according to the mass ratio of 1: 4.5.
The hyperbranched polyborosiloxane containing the epoxy group is prepared according to the method of example 1 in Chinese patent document CN 107868252B; the particle size of the nano calcium carbonate is 450 nm.
The preparation method of the lithium metal graphene battery is characterized by comprising the following steps:
step S1, uniformly mixing titanium dioxide quantum dot/metal lithium/fullerene compound, conductive agent Super P and polyvinylidene fluoride PVDF according to the mass ratio of 8:1:1, then dripping N-methyl pyrrolidone into the mixture, uniformly stirring the mixture to form viscous pasty viscous liquid, then uniformly coating the viscous liquid on copper foil through a coating machine, and compacting the copper foil, wherein the coating surface density is 250g/m2Compacted density 2.7g/cm3(ii) a Then continuously slitting and continuously rolling to obtain a positive pole piece;
step S2, uniformly mixing titanium dioxide quantum dot/metal lithium/fullerene compound, conductive agent Super P and PVDF according to the mass ratio of 8:1:1, then dripping N-methyl pyrrolidone into the mixture, uniformly stirring the mixture into viscous uniform stable slurry by using double-planet vacuum high-speed stirring equipment, then stably and uniformly coating the prepared slurry on the surface of copper foil by using an extrusion type double-sided coating machine, and coating the coating surfaceDensity 210g/m2Compacted density 1.75g/cm3(ii) a Then continuously slitting and continuously rolling to obtain a negative pole piece;
step S3, uniformly mixing hyperbranched polyborosiloxane containing epoxy groups, melamine and nano calcium carbonate according to a weight ratio, carrying out melt extrusion and heat setting processes, then placing the mixture in a hydrochloric acid solution with a mass percentage concentration of 11% for soaking for 5.5 hours, then taking out the mixture, washing the mixture for 5 times with water, finally placing the mixture in a vacuum drying oven at 94 ℃ for drying until the weight is constant, and finally obtaining the diaphragm;
and S4, assembling and injecting liquid to obtain the lithium metal graphene battery.
Example 5
The super-capacity graphene battery is characterized in that a positive electrode material of the lithium metal graphene battery is a nitrogen-doped nickel-cobalt-manganese-graphene-based compound; the cathode material of the lithium metal graphene battery is a titanium dioxide quantum dot/metal lithium/fullerene compound; the diaphragm of the lithium metal graphene battery is prepared from the following components in parts by weight: 60 parts of hyperbranched polyborosiloxane containing epoxy groups, 15 parts of melamine and 10 parts of nano calcium carbonate.
The nitrogen-doped nickel-cobalt-manganese-graphene-based composite is a mixture formed by uniformly mixing a nitrogen-doped nickel-cobalt-manganese ternary material and graphene according to a mass ratio of 5: 1; the nitrogen-doped nickel-cobalt-manganese ternary material is prepared according to the method of the embodiment 1 in the Chinese patent document CN 107565127B.
The titanium dioxide quantum dot/metal lithium/fullerene compound is a mixture formed by uniformly mixing titanium dioxide quantum dots, metal lithium and fullerene according to the mass ratio of 1:6: 0.6; the titanium dioxide quantum dots are prepared according to the method of example 1 in Chinese patent document CN 108906013A.
The electrolyte of the lithium metal graphene battery is a lithium hexafluorophosphate solution with the concentration of 1.2 mol/L; the solvent of the lithium hexafluorophosphate solution is a mixture formed by mixing ethylene carbonate and diethyl carbonate according to the mass ratio of 1: 5; the hyperbranched polyborosiloxane containing the epoxy group is prepared according to the method of example 1 in Chinese patent document CN 107868252B; the particle size of the nano calcium carbonate is 500 nm.
The preparation method of the lithium metal graphene battery is characterized by comprising the following steps:
step S1, uniformly mixing titanium dioxide quantum dot/metal lithium/fullerene compound, conductive agent Super P and polyvinylidene fluoride PVDF according to the mass ratio of 8:1:1, then dripping N-methyl pyrrolidone into the mixture, uniformly stirring the mixture to form viscous pasty viscous liquid, then uniformly coating the viscous liquid on copper foil through a coating machine, and then compacting the copper foil, wherein the coating surface density is 260g/m2Compacted density of 2.8g/cm3(ii) a Then continuously slitting and continuously rolling to obtain a positive pole piece;
step S2, uniformly mixing titanium dioxide quantum dot/metal lithium/fullerene compound, conductive agent Super P and PVDF according to the mass ratio of 8:1:1, then dripping N-methyl pyrrolidone into the mixture, uniformly stirring the mixture into viscous uniform stable slurry by using double-planet vacuum high-speed stirring equipment, and then stably and uniformly coating the prepared slurry on the surface of copper foil by using an extrusion type double-sided coating machine, wherein the coating surface density is 220g/m2Compacted density 1.8g/cm3(ii) a Then continuously slitting and continuously rolling to obtain a negative pole piece;
step S3, uniformly mixing hyperbranched polyborosiloxane containing epoxy groups, melamine and nano calcium carbonate according to a weight ratio, carrying out melt extrusion and heat setting processes, then placing the mixture in a hydrochloric acid solution with the mass percentage concentration of 12% for soaking for 6 hours, then taking out the mixture, washing the mixture for 6 times with water, finally placing the mixture in a vacuum drying oven for drying at 95 ℃ to constant weight, and finally obtaining the diaphragm;
and S4, assembling and injecting liquid to obtain the lithium metal graphene battery.
Comparative example 1
The present example provides an ultra-capacity graphene battery, which has a formulation and a preparation method substantially the same as those of example 1, except that no titanium dioxide quantum dots are added.
Comparative example 2
This example provides an ultracapacitor cell that is formulated and prepared in substantially the same manner as in example 1, except that no fullerene is added.
Comparative example 3
This example provides an ultra-capacity graphene battery that is substantially the same in formulation and preparation as example 1, except that no melamine is added.
The lithium metal graphene batteries described in examples 1 to 5 and comparative examples 1 to 3 were charged at a rate of 1.0C and discharged at a rate of 1.0C at a temperature of 25 ± 3 ℃, and were subjected to cycle performance tests, the test results of which are shown in table 1.
TABLE 1
Item
|
Cycle performance (capacity retention after 500 cycles)%
|
Energy Density (Wh/kg)
|
Example 1
|
97.1
|
184.3
|
Example 2
|
97.3
|
184.7
|
Example 3
|
97.4
|
184.9
|
Example 4
|
97.7
|
185.3
|
Example 5
|
97.9
|
185.5
|
Comparative example 1
|
93.4
|
149.4
|
Comparative example 2
|
93.9
|
150.6
|
Comparative example 3
|
96.2
|
174.8 |
As can be seen from table 1, compared with the comparative example, the lithium metal graphene battery disclosed in the embodiment of the present invention has cycle performance (capacity retention rate after 500 cycles) of not less than 97.1%, and the comparative example is not more than 96.2%; the energy density is more than or equal to 184.3Wh/kg, and the comparative example is less than or equal to 174.8 Wh/kg; therefore, the example products have more excellent electrochemical stability, cycle performance and electrical performance.
Tests show that the product in the embodiment 1-5 can work within the range of-50 to +60 ℃, the storage life of the battery at normal temperature exceeds 12 years, no gas is separated out in the storage and discharge processes, and the safety performance is good.
The foregoing is directed to embodiments of the present invention and, more particularly, to a method and apparatus for controlling a power converter in a power converter, including a power converter, a display and a display panel.