Positive electrode, battery and electrical equipment

Abstract

The present invention provides a positive electrode, a battery, and an electrical device. The positive electrode includes lithium oxide and an oxygen free radical scavenger, the oxygen free radical scavenger includes a metal atom and BP4VA coordinated with the metal atom; the metal atom includes Cd, and the BP4VA is 9,10-bis[(cis)-2-(pyridyl-4-)vinyl]anthracene; the metal atom is coordinated with the nitrogen atom in the BP4VA. This positive electrode can improve the energy density of the battery while also giving the battery better cycle performance.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to positive electrodes, batteries, and electrical equipment. Background Art

[0002] To improve the battery life of lithium-ion batteries, the industry is currently experimenting with adding lithium supplements to the positive electrode. This allows the supplement to release active lithium during charging, compensating for the irreversible loss of active lithium caused by the solid electrolyte interface membrane at the negative electrode, thereby improving the energy density and cycle performance of lithium-ion batteries. Lithium oxide is a viable positive electrode supplement, but its delithiation process often releases oxygen free radicals, which can oxidize the electrolyte in the battery, causing poor battery performance. Alternatively, the oxygen free radicals can diffuse to the negative electrode, consuming the active lithium there and causing a loss of battery capacity. Summary of the Invention

[0003] In view of this, embodiments of the present application provide a positive electrode, a battery, and an electrical device. The positive electrode can improve the energy density of the battery while also enabling the battery to have better cycle performance.

[0004] In a first aspect, an embodiment of the present application provides a positive electrode, comprising a current collector and a positive electrode material layer disposed on at least one side of the current collector, wherein the positive electrode material layer comprises a lithium supplement and an oxygen free radical scavenger;

[0005] The lithium supplement comprises lithium oxide, and the lithium oxide comprises Li x M y O z , M includes at least one of Co, Ni, Mn, and Fe, 0 <x≤6,0≤y≤2,2≤z≤4;

[0006] The oxygen free radical scavenger includes a metal atom and BP4VA coordinated with the metal atom; the metal atom includes Cd, and the BP4VA is 9,10-bis[(cis)-2-(pyridyl-4-)vinyl]anthracene; the metal atom is coordinated and connected with the N atom in the BP4VA.

[0007] The positive electrode includes lithium oxide, which can release active lithium ions during the battery's initial charge to compensate for the irreversible lithium ion loss caused by the growth of the SEI film on the negative electrode surface, thereby improving the battery's energy density. More importantly, the oxygen free radical scavenger in the positive electrode can quickly capture the oxygen free radicals released by the lithium oxide during this process. When applied to a battery, the positive electrode can alleviate the problems of electrolyte gassing and deterioration, and / or capacity decay, that are common in related batteries. Therefore, the positive electrode can simultaneously improve the battery's energy density and high-temperature cycling performance.

[0008] A second aspect of the embodiments of the present application provides a battery, comprising the positive electrode provided in the first aspect of the embodiments of the present application; and / or,

[0009] The second positive electrode includes a coordination polymer, the coordination polymer includes a metal atom and BP4VA- 1 O2;

[0010] Wherein, the metal atom includes Cd, the BP4VA- 1 O2 is a structure in which the anthracene group of 9,10-bis[(cis)-2-(pyridyl-4-)vinyl]anthracene is bonded to two oxygen atoms; the metal atom and the BP4VA- 1 The N atoms in O2 are coordinated and connected.

[0011] The above-mentioned battery can have high energy density, better room temperature cycle performance and high temperature cycle performance.

[0012] The third aspect of the present application provides an electric device, including the aforementioned battery provided in the present application. Due to the battery provided in the present application, the electric device has a strong endurance and a good market prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 (a) is a schematic structural diagram of the positive electrode material layer in the positive electrode provided in an embodiment of the present application, and (b) is a partially enlarged schematic diagram of (a);

[0014] Figure 2A A schematic diagram of the molecular structure of an oxygen free radical scavenger used in one embodiment of the present application;

[0015] Figure 2B Schematic diagram of the molecular structure of a coordination polymer according to an embodiment of the present application. DETAILED DESCRIPTION

[0016] During the first charge of a lithium-ion battery, a solid electrolyte interphase (SEI) film forms on the surface of the negative electrode. The formation of the SEI film consumes active lithium ions, resulting in a decrease in the battery's energy density. The industry has attempted to address this technical issue by adding lithium supplements to the positive electrode. From the perspective of improving energy density, lithium oxide is a good lithium supplement. However, the delithiation of lithium oxide is often accompanied by the release of oxygen free radicals, which attack the electrolyte, causing it to deteriorate and produce gas. Alternatively, the oxygen free radicals diffuse to the negative electrode, consuming active lithium ions and resulting in a loss of battery capacity.

[0017] In order to solve the above technical problems, the embodiment of the present application provides a positive electrode, comprising a current collector and a positive electrode material layer provided on at least one side surface of the current collector, wherein the positive electrode material layer comprises a lithium supplement agent and an oxygen free radical scavenger;

[0018] The lithium supplement comprises lithium oxide, and the lithium oxide comprises Li x M y O z , M includes at least one of Co, Ni, Mn, and Fe, 0 <x≤6,0≤y≤2,2≤z≤4;

[0019] The oxygen free radical scavenger includes a metal atom and BP4VA coordinated with the metal atom; the metal atom includes Cd, and the BP4VA is 9,10-bis[(cis)-2-(pyridyl-4-)vinyl]anthracene; the metal atom is coordinated and connected with the N atom in the BP4VA.

[0020] It can be understood that the oxygen free radical scavenger may have a periodic structure, wherein one periodic unit includes a Cd atom and BP4VA coordinated with the Cd atom.

[0021] The positive electrode provided in the embodiment of the present application includes lithium oxide, which can release active lithium ions during the first charging process of the battery to make up for the irreversible lithium ion loss caused by the growth of the SEI film on the surface of the negative electrode, thereby improving the energy density of the battery; More importantly, the oxygen free radical scavenger in the positive electrode can quickly capture the oxygen free radicals released by the lithium oxide in the above process. When the above positive electrode is applied to the battery, it can improve the problems of gas production and deterioration of the electrolyte of the battery in the related art, and / or capacity attenuation. Therefore, the above positive electrode can simultaneously improve the energy density, room temperature cycle performance and high temperature cycle performance of the battery. It should be noted that the reaction of the above lithium oxide releasing lithium ions and the reaction of oxygen free radicals capturing oxygen free radicals are carried out during the first charging process of the battery. In addition, after the first charging process, the above two reactions may also occur during the charging process of the subsequent charge and discharge cycles.

[0022] It should be noted that one BP4VA coordinated with the Cd atom can capture two oxygen atoms. Specifically, the anthracene in BP4VA can capture two oxygen atoms, so that BP4VA is converted into BP4VA- 1 O2, and BP4VA- coordinated with Cd 1 The O2 structure is stable and will not release oxygen free radicals again during normal battery charge and discharge cycles.

[0023] In some embodiments of the present application, the oxygen free radical scavenger further comprises 4-NBA coordinated with a metal atom; wherein the 4-NBA is a structure in which the carboxyl group in 4-nitrobenzoic acid loses a hydrogen ion, and the metal atom is coordinated with the oxygen atom in the -OOC group in the 4-NBA. Figure 2A As shown, Figure 2A This is the molecular structure of the oxygen free radical scavenger provided in one embodiment of the present application. In this way, the molecular weight of the oxygen free radical scavenger can be effectively increased, and the polymer chain can be increased vertically.

[0024] Specifically, the structure of the structure in which the carboxyl group in 4-nitrobenzoic acid loses a hydrogen ion is shown in formula (1), wherein the position marked with * is coordinated with the metal atom;

[0025]

[0026] In some embodiments of the present application, the lithium oxide comprises one or more of Li5FeO4, Li2C2O4, and Li2CO3. These lithium oxides can decompose during charging to release active lithium ions, thereby increasing the energy density of the battery. In some specific embodiments, the lithium oxide comprises Li5FeO4.

[0027] In some embodiments of the present application, the chemical formula of the oxygen free radical scavenger is [Cd(BP4VA)(4-NBA)2] n , wherein n is an integer between 3000 and 50000. This is not only beneficial to the capture efficiency of oxygen free radicals, but also easy to obtain industrially. Specifically, n can be, for example, 3000, 5000, 10000, 15000, 20000, 25000, 30000, 35000, 40000, 45000, 50000, etc. It can be understood that n is the number of periodic units. That is, a periodic unit includes a Cd atom, a BP4VA coordinated to the Cd, and two 4-NBAs, both of which are coordinated to the Cd atom through the oxygen atoms in -OOC. An oxygen free radical scavenger cluster includes n of the above periodic units. Furthermore, controlling n≤50000 is to control the steric hindrance of the structure of the oxygen free radical scavenger to be smaller, thereby being more conducive to the capture of oxygen free radicals. Within the above range, the better n is, the more conducive it is to the capture of oxygen free radicals.

[0028] In some embodiments of the present application, in the positive electrode material layer, the molar ratio of lithium oxide to oxygen free radical scavenger is 1: (0.00005-0.0009). In this way, it is beneficial to fully absorb the oxygen free radicals released by lithium oxide during the charging process, thereby ensuring good cycle performance of the battery. In the embodiment of the present application, nuclear magnetic resonance or X-ray diffraction (X-Ray Diffraction, XRD) can be used to test the molar ratio of lithium oxide to oxygen free radical scavenger. Specifically, the molar ratio of lithium oxide to oxygen free radical scavenger can be, for example, 0.00005, 0.00006, 0.00007, 0.00008, 0.00009, etc.

[0029] In some embodiments of the present application, the mass proportion of the oxygen free radical scavenger in the positive electrode material layer is 1%-2.5%. In some specific embodiments, the mass proportion of the oxygen free radical scavenger in the positive electrode material layer is 1.5%-2.3%. In this way, the energy density and cycle performance of the positive electrode can be further guaranteed. Specifically, the mass proportion of the oxygen free radical scavenger in the positive electrode material layer can be 1.0%, 1.2%, 1.5%, 1.8%, 2.0%, 2.2%, or 2.5%.

[0030] In some embodiments of the present application, the mass proportion of the lithium supplement in the positive electrode material layer is 1%-5%. In some specific embodiments, the mass proportion of lithium oxide in the positive electrode material layer is 1%-5%. In this way, it can provide sufficient active lithium ions to improve the energy density of the battery during charging, and will not squeeze the share of other materials, which is beneficial to the comprehensive electrochemical performance of the battery. Specifically, the mass proportion of lithium oxide in the positive electrode material layer can be, for example, 1%, 2%, 3%, 4%, or 5%.

[0031] In order to reduce the impact of the oxygen free radical scavenger and the products formed by its captured oxygen on the internal resistance of the battery, in some embodiments of the present application, the oxygen free radical scavenger is contained in a polymer shell to form an oxygen free radical capture capsule. Figure 1 The positive electrode material layer includes an oxygen free radical capture capsule, and the oxygen free radical capture capsule includes a polymer shell and the aforementioned oxygen free radical capture agent contained in the polymer shell.

[0032] In some embodiments of the present application, the thickness of the polymer shell is 5nm-25nm. In this way, the polymer shell has a certain strength and is not easy to break and expose the oxygen free radical scavenger during the charge and discharge process. It is also conducive to the capture of oxygen free radicals, thereby improving the cycle performance of the final battery. Specifically, the thickness of the polymer shell can be, for example, 5nm, 8nm, 10nm, 12nm, 15nm, 18nm, 20nm, 22nm, or 25nm. In the embodiments of the present application, the thickness of the polymer shell can be characterized by scanning electron microscopy.

[0033] In some embodiments of the present application, the polymer shell material includes, but is not limited to, one or more of polyvinylidene fluoride (PVDF), polypropylene (PP), and polyethylene (PE). These materials have both sufficient strength and toughness to resist cracking during charge-discharge cycles and good oxygen free radical permeability, facilitating the capture of oxygen free radicals.

[0034] In some embodiments of the present application, the particle size of the above-mentioned oxygen free radical capture capsule is ≤1μm. In this way, the oxygen free radical capture capsule has a large specific surface area, which is conducive to the capture of oxygen free radicals. Specifically, the particle size of the oxygen free radical capture capsule can be, for example, 100nm, 200nm, 300nm, 400nm, 500nm, 600nm, 700nm, 800nm, 900nm, 1μm, etc. In the embodiments of the present application, the shape of the oxygen free radical capture capsule can be any shape such as spherical, ellipsoidal, irregular, etc., and the embodiments of the present application are not limited to this. In the embodiments of the present application, the oxygen free radical capture agent can be separated from the positive electrode material layer and its particle size can be tested using a laser particle size analyzer.

[0035] In some embodiments of the present application, the positive electrode material layer further includes a positive electrode active material, and the positive electrode active material includes one or more of lithium iron phosphate, lithium manganese iron phosphate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium manganese oxide, lithium nickel manganese oxide and lithium cobalt oxide. The positive electrode active material may be a combination of lithium oxide and one or more of the above-mentioned other positive electrode active materials. The mass percentage of other positive electrode active materials in the positive electrode material layer is in the range of 85%-97%, for example, it can be 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%.

[0036] The present application also provides a battery, comprising the aforementioned positive electrode provided in the present application; or,

[0037] The battery includes a second positive electrode, the second positive electrode includes a coordination polymer, the coordination polymer includes a metal atom and BP4VA- coordinated with the metal atom 1 O2; It should be noted that the coordination polymer is the product obtained by the aforementioned oxygen free radical scavenger capturing oxygen atoms.

[0038] Wherein, the metal atom includes Cd, the BP4VA- 1 O2 is a structure in which the anthracene group of 9,10-bis[(cis)-2-(pyridyl-4-)vinyl]anthracene is bonded to two oxygen atoms; the metal atom and the BP4VA- 1 The N atoms in O2 are coordinated and connected.

[0039] The above-mentioned battery can have high energy density, better room temperature cycle performance and high temperature cycle performance.

[0040] The battery provided in the embodiments of the present application may be an unformed battery, a formed battery, a capacity-divided battery, or a battery in any cycle state.

[0041] It is understandable that if the battery is a battery before formation, the battery includes the aforementioned positive electrode provided in the embodiment of the present application. If the battery is a battery after formation, the battery includes a second positive electrode. In addition, considering that the lithium oxide may not be completely decomposed during the formation process, the battery after formation may also include the aforementioned positive electrode provided in the embodiment of the present application. In other embodiments, in the battery after formation, it is also possible that the second positive electrode also includes lithium oxide and an oxygen free radical scavenger, or the second positive electrode also includes an oxygen free radical scavenger and does not contain lithium oxide. That is, the second positive electrode includes lithium oxide, a coordination polymer and an oxygen free radical scavenger, or the second positive electrode includes an oxygen free radical scavenger and a coordination polymer and does not contain lithium oxide. The second positive electrode in the above two cases may exist at the same time. The above are all considered to be the scope of protection of the embodiment of the present application.

[0042] Since in some cases, the oxygen free radical scavenger is contained in the polymer shell, in some embodiments of the present application, the coordination polymer is also contained in the polymer shell. In some specific embodiments, the polymer shell contains both the oxygen free radical scavenger and the coordination polymer.

[0043] In some embodiments of the present application, the oxygen free radical scavenger further comprises 4-NBA coordinated with the metal atom. In this case, in the battery, the coordination polymer obtained after the reaction of the oxygen free radical scavenger further comprises 4-NBA coordinated with the metal atom. Figure 2B As shown, Figure 2B is the molecular structure of the coordination polymer involved in one embodiment of the present application.

[0044] In some embodiments of the present application, a battery includes a positive electrode, a negative electrode, and an electrolyte located between the positive electrode and the negative electrode.

[0045] In some embodiments of the present application, the above-mentioned negative electrode can be any known negative electrode that is suitable for lithium-ion batteries and compatible with the positive electrode provided in the embodiments of the present application. For example, the negative electrode includes a negative electrode current collector and a negative electrode material layer provided on the surface of the negative electrode current collector, wherein the negative electrode current collector can be a metal foil, such as copper foil, aluminum foil, etc. The negative electrode material layer includes a negative electrode active material, which is a material that can accept and release lithium ions. The negative electrode active material can be one or more of a carbon-based negative electrode active material, a silicon-based negative electrode active material, and a phosphorus-based negative electrode active material. The negative electrode material layer can include one or more negative electrode active materials.

[0046] In some embodiments of the present application, the carbon-based negative electrode active material may be one or more of graphite, hard carbon, soft carbon, porous carbon, mesophase carbon microspheres, and graphene; the silicon-based negative electrode active material may be one or more of silicon, silicon-carbon compounds, silicon oxide compounds, and silicon alloys; and the phosphorus-based negative electrode active material may be one or more of black phosphorus, red phosphorus, and phosphorus-carbon compounds.

[0047] In embodiments of the present application, the negative electrode material layer may further include a certain amount of a binder, a conductive agent, and other components. Examples of the binder include sodium carboxymethylcellulose (CMC-Na), styrene-butadiene rubber (SBR), polyacrylic acid (PAA), and lithium polyacrylate (LiPAA). Examples of the conductive agent include Super P, amorphous carbon, carbon nanotubes, carbon fibers, and graphene. The aforementioned binders and conductive agents are merely illustrative and are not intended to be limiting.

[0048] In some embodiments of the present application, a battery includes a positive electrode, a negative electrode, a separator located between the positive electrode and the negative electrode, and an electrolyte.

[0049] In the embodiments of the present application, the separator can be any known separator suitable for lithium-ion batteries. Specifically, the separator can be, for example, a single-layer polypropylene (PP), a single-layer polyethylene (PE), a double-layer PP / PE, a double-layer PP / PP, a triple-layer PP / PE / PP, or a ceramic-coated PE separator.

[0050] In some embodiments of the present application, the preparation of the above-mentioned battery includes:

[0051] The negative electrode, the separator and the positive electrode provided in the embodiment of the present application are stacked or wound, packaged and injected with electrolyte to obtain a battery.

[0052] In some embodiments of the present application, the steps of formation and volume separation are further included after injecting the electrolyte.

[0053] The present invention also provides an electric device including the battery provided in the present invention. Since the battery provided in the present invention is used to power electronic components in the electric device, the electric device has good endurance and strong market competitiveness.

[0054] In some embodiments of the present application, the above-mentioned electrical equipment includes but is not limited to vehicles, or 3C electronic consumer products such as mobile phones, laptops, tablets, smart watches, etc.

[0055] The technical solutions of the embodiments of the present application are further explained below with multiple embodiments.

[0056] Example 1

[0057] A positive electrode comprises a current collector (specifically carbon-coated aluminum foil) and a positive electrode material layer disposed on opposite sides of the current collector, wherein the positive electrode material layer comprises lithium oxide (specifically Li5FeO4), other positive electrode active materials (specifically lithium iron phosphate with a particle size D50 of 1.0 μm), an oxygen free radical scavenger ([Cd(BP4VA)(4-NBA)2] n , n = 30,000), carbon nanotubes (CNTs), Super P, and PVDF. The mass ratio of lithium iron phosphate: Li₅FeO₄: oxygen free radical scavenger: CNTs: Super P: PVDF is 100:y:x:12:0.3:2.5, where x = 1.56 and y = 1.8. In other words, the oxygen free radical scavenger accounts for 1.3% of the mass of the positive electrode material layer.

[0058] Example 2

[0059] The difference from Example 1 is that x=1.76, y=1.8, that is, the oxygen free radical scavenger accounts for 1.5% of the mass of the positive electrode material layer.

[0060] Example 3

[0061] The difference from Example 1 is that x=2.07, y=1.8, that is, the oxygen free radical scavenger accounts for 1.8% of the mass of the positive electrode material layer.

[0062] Example 4

[0063] The difference from Example 1 is that x=2.45, y=1.8, that is, the oxygen radical scavenger accounts for 2.1% of the mass of the positive electrode material layer.

[0064] Example 5

[0065] The difference from Example 1 is that x=2.74, y=1.8, that is, the oxygen free radical scavenger accounts for 2.3% of the mass of the positive electrode material layer.

[0066] In order to highlight the beneficial effects of the embodiments of the present application, the following comparative examples are provided.

[0067] Comparative Example 1

[0068] The difference from Example 1 is that the positive electrode material layer does not contain the aforementioned lithium oxide, nor does it contain an oxygen free radical scavenger, that is, x=0, y=0.

[0069] Comparative Example 2

[0070] The difference from Example 1 is that no oxygen free radical scavenger is contained (x=0), and y=1.8.

[0071] Performance Testing

[0072] (1) Preparation of test cells: The positive electrodes of the above-mentioned embodiments and comparative examples were laminated with the separator and negative electrode groups, and vacuum injection was performed at an injection coefficient of 3.5g / Ah. After sealing, they were aged at high temperature, formed, aged, and divided into different capacities to produce a square soft-pack battery with a length of 80mm and a width of 60mm. The negative electrode included a negative electrode current collector (specifically, a conductive foil with a thickness of 8μm) and a negative electrode material layer provided on opposite sides of the negative electrode current collector. The negative electrode material layer was composed of natural graphite, sodium carboxymethyl cellulose, and styrene-butadiene rubber in a mass ratio of 100:1.5:3.

[0073] (2) Battery capacity test: The test batteries of the embodiments and comparative examples were subjected to charge and discharge cycles at 25°C, wherein "full charging to 3.8V at a constant current and constant voltage of 0.33C, and then discharging to 2.0V at a constant current of 0.33C after standing" was considered one cycle. After three cycles, the third discharge capacity was recorded as Q, in Ah.

[0074] (3) DC internal resistance (DCIR) test: Charge and discharge three times at 0.33C at 25°C with a voltage range of 2.0-3.8V. The third discharge capacity is calibrated as the battery capacity Q. After the capacity is calibrated, charge the battery to 0.5Q at 0.33C at 25°C, let it stand for 20 minutes and record the end-of-stand voltage V1. Discharge the battery at 1.5C for 30 seconds and record the end-of-discharge voltage V2. DCIR = (V1-V2) / 1.5C, unit: mΩ.

[0075] (4) High temperature cycle performance: At 25°C, charge and discharge three times at 0.33C, with a voltage range of 2.0-3.8V, and calibrate the third discharge capacity as the battery capacity Q; after calibrating the capacity, charge at 45°C at 1C constant current and constant voltage to 3.8V, with a cut-off current of 0.05C, and then let it stand for 30 minutes, and discharge at 1C constant current to 2.0V, and then let it stand for 30 minutes; repeat the above steps 500 times, and record the capacity retention rate, which is the discharge capacity of the 500th cycle / the discharge capacity of the first cycle × 100%.

[0076] Table 1

[0077]

[0078] Comparing Examples 1-5 with Comparative Example 2, it can be seen that, under the condition that the amount of lithium material added remains unchanged, the addition of an oxygen free radical scavenger slightly affects the DCIR of the battery cell, but can significantly improve the capacity retention rate of the battery cell. Also, comparing Examples 1-5 with Comparative Example 1, the addition of an oxygen free radical scavenger and lithium oxide can significantly improve the energy density and cycle life of the battery cell. The addition of lithium oxide can provide more active lithium ions to the battery cell, and the addition of an oxygen free radical scavenger can effectively prevent the oxygen free radicals released during the active phase of lithium oxide from having a significant impact on the battery cell.

[0079] The above is an exemplary embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made thereto without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A positive electrode, characterized in that The invention comprises a current collector and a positive electrode material layer disposed on at least one side of the current collector, wherein the positive electrode material layer comprises a lithium supplement and an oxygen free radical scavenger; the oxygen free radical scavenger is contained in a polymer shell to form an oxygen free radical scavenging capsule; the thickness of the polymer shell is 5nm-20nm, and the particle size of the oxygen free radical scavenging capsule is ≤1μm; The lithium supplement comprises lithium oxide, and the lithium oxide comprises Li x M y O z , M includes at least one of C, Co, Ni, Mn, and Fe, 0 <x≤6,0≤y≤2,2≤z≤4; The oxygen free radical scavenger includes a metal atom and BP4VA coordinated with the metal atom; the metal atom includes Cd, the BP4VA is 9,10-bis[(cis)-2-(pyridyl-4-)vinyl]anthracene, and the metal atom is coordinated and connected with the N atom in the BP4VA.

2. The positive electrode according to claim 1, characterized in that The oxygen free radical also includes 4-NBA coordinated with the metal atom; wherein the 4-NBA is a structure in which the carboxyl group in 4-nitrobenzoic acid loses a hydrogen ion, and the metal atom is coordinated and connected with the oxygen atom in the -OOC group in the 4-NBA.

3. The positive electrode according to claim 1, characterized in that The chemical formula of the oxygen free radical scavenger is [Cd(BP4VA)(4-NBA)2] n , where n is a positive integer between 3000 and 50000.

4. The positive electrode according to any one of claims 1 to 3, characterized in that In the positive electrode material layer, the molar ratio of the lithium oxide to the oxygen free radical scavenger is 1:(0.00005-0.0009).

5. The positive electrode according to any one of claims 1 to 3, characterized in that The oxygen free radical scavenger accounts for 1% to 2.5% by mass in the positive electrode material layer.

6. The positive electrode according to any one of claims 1 to 3, characterized in that The lithium oxide accounts for 1% to 5% by mass in the positive electrode material layer.

7. The positive electrode according to any one of claims 1 to 3, characterized in that The material of the polymer shell includes one or more of polyvinylidene fluoride, polypropylene, and polyethylene.

8. The positive electrode according to any one of claims 1 to 3, characterized in that The positive electrode material layer further includes a positive electrode active material, and the positive electrode active material includes one or more of lithium iron phosphate, lithium manganese iron phosphate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium manganese oxide, lithium nickel manganese oxide, and lithium cobalt oxide.

9. A battery, characterized in that: comprising the positive electrode according to any one of claims 1 to 8; and / or, The second positive electrode includes a coordination polymer, the coordination polymer includes a metal atom and BP4VA- 1 O2; the coordination polymer is contained in a polymer shell to form an oxygen free radical capture capsule; the thickness of the polymer shell is 5nm-20nm, and the particle size of the oxygen free radical capture capsule is ≤1μm; Wherein, the metal atom includes Cd, the BP4VA- 1 O2 is a structure in which the anthracene group of 9,10-bis[(cis)-2-(pyridyl-4-)vinyl]anthracene is bonded to two oxygen atoms; the metal atom and the BP4VA- 1 The N atoms in O2 are coordinated and connected.

10. An electrical device, characterized in that: The electric device comprises the battery according to claim 9.

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