A type of battery positive electrode

Abstract

This invention relates to a battery positive electrode. Specifically, the invention provides a positive electrode comprising a positive electrode active material, wherein the positive electrode active material comprises Hg2O7Sb2. Batteries prepared using the positive electrode of this invention exhibit excellent energy density, cutoff voltage, and safety performance.

Description

Technical Field

[0001] This invention relates to the field of batteries, and more specifically to a battery positive electrode. Background Technology

[0002] Storage batteries are widely used in production and daily life. The existing storage batteries are mainly lead-acid batteries and lithium batteries.

[0003] Lead-acid batteries use lead alloy as the base material for their positive and negative electrodes. The active material mainly consists of lead powder, sulfuric acid, and additives. The active material is coated onto the grid of the lead base and cured under specific temperature and humidity conditions to form the green electrode plates. Lead-acid batteries are manufactured using semi-finished materials such as plastic shells, electrode plates, and separators, through assembly and charging. However, the positive electrode active material of lead-acid batteries has the disadvantage of low energy density (100 Ah / kg).

[0004] The positive and negative electrodes of a lithium battery use aluminum film and copper film as current collectors, respectively. The positive and negative electrode slurries prepared according to process requirements are coated on the current collectors, dried, rolled, and then the tabs are made. Finally, the separator and shell are selected for assembly and charging to produce a lithium-ion battery. However, lithium-ion batteries have poor safety performance, high production environment requirements, and high cost.

[0005] Therefore, there is a need in this field to develop a battery with superior performance. Summary of the Invention

[0006] The purpose of this invention is to develop a positive electrode for a battery with excellent energy density, cutoff voltage, and safety.

[0007] The first aspect of the present invention provides a positive electrode, wherein the positive electrode includes a positive electrode active material, and the positive electrode active material includes Hg2O7Sb2.

[0008] Preferably, the positive electrode includes the positive electrode of a battery.

[0009] Preferably, the battery includes a primary battery or a rechargeable battery.

[0010] Preferably, the positive electrode active material further contains silver, NiO, acetylene black, and graphite powder.

[0011] Preferably, the silver includes nano-silver.

[0012] Preferably, the positive electrode active material includes Hg2O7Sb2, silver, NiO, acetylene black, and graphite.

[0013] Preferably, the Hg2O7Sb2 is 48-58 parts by weight, more preferably 50-55 parts by weight, even more preferably 51-53 parts by weight, and even more preferably 52 parts by weight.

[0014] Preferably, the amount of Hg2O7Sb2 is 48-52 parts by weight, more preferably 50 parts by weight.

[0015] Preferably, the silver is 0.1-3 parts by weight, more preferably 0.2-2 parts by weight, even more preferably 0.2-1.5 parts by weight, and even more preferably 0.4-1.2 parts by weight, for example 0.4 parts by weight or 1.2 parts by weight.

[0016] Preferably, the silver is 0.8-1.5 parts by weight, more preferably 1.0-1.4 parts by weight, even more preferably 1.1-1.3 parts by weight, and even more preferably 1.2 parts by weight.

[0017] Preferably, the silver is 0.1-0.8 parts by weight, more preferably 0.2-0.6 parts by weight, even more preferably 0.3-0.5 parts by weight, and even more preferably 0.4 parts by weight.

[0018] Preferably, the silver content is 0.7-1.2 parts by weight, more preferably 0.9 parts by weight.

[0019] Preferably, the NiO is 2-15 parts by weight, more preferably 2-10 parts by weight, and even more preferably 4.5-10 parts by weight, for example 4.5 parts by weight or 10 parts by weight.

[0020] Preferably, the NiO is 3.8-5.0 parts by weight, more preferably 4.0-5.0 parts by weight, even more preferably 4.3-4.7 parts by weight, and even more preferably 4.5 parts by weight.

[0021] Preferably, the NiO is 4-15 parts by weight, more preferably 8-12 parts by weight, even more preferably 9-11 parts by weight, even more preferably 9.5-10.5 parts by weight, and even more preferably 10 parts by weight.

[0022] Preferably, the NiO is 4-6 parts by weight, more preferably 5 parts by weight.

[0023] Preferably, the acetylene black is 0.1-0.8 parts by weight, more preferably 0.2-0.4 parts by weight, and even more preferably 0.3 parts by weight.

[0024] Preferably, the acetylene black is 0.4-0.6 parts by weight, more preferably 0.5 parts by weight.

[0025] Preferably, the graphite powder is 1-5 parts by weight, more preferably 2-3 parts by weight, and even more preferably 2.5 parts by weight.

[0026] Preferably, the graphite powder is 1.8-2.2 parts by weight, more preferably 2 parts by weight.

[0027] Preferably, the weight ratio of Hg2O7Sb2 to silver is 25-65:1, more preferably 30-55:1, even more preferably 35-50:1, even more preferably 40-45:1, and most preferably 43:1.

[0028] Preferably, the weight ratio of Hg2O7Sb2 to NiO is 5-25:1, more preferably 5-20:1, even more preferably 8-16:1, even more preferably 10-14:1, and most preferably 11.6:1.

[0029] Preferably, the weight ratio of Hg2O7Sb2 to acetylene black is 150-190:1, more preferably 160-185:1, even more preferably 165-180:1, even more preferably 170-176:1, and most preferably 173:1.

[0030] Preferably, the weight ratio of Hg2O7Sb2 to graphite powder is 10-30:1, more preferably 15-30:1, even more preferably 18-25:1, even more preferably 20-22:1, and most preferably 21:1.

[0031] Preferably, the positive electrode active material is coated on the surface of an inert material.

[0032] Preferably, the inert material includes an inert material sheet, an inert material rod, or an inert material bar.

[0033] Preferably, the inert material includes graphite.

[0034] Preferably, the inert material includes graphite sheets, graphite rods, or graphite bars.

[0035] Preferably, the positive electrode comprises a positive electrode active material and an inert material, wherein the positive electrode active material is coated on the surface of the inert material.

[0036] Preferably, the thickness of the inert material is 0.05-0.5 mm, more preferably 0.05-0.3 mm, even more preferably 0.05-0.15 mm, and even more preferably 0.08-0.12 mm.

[0037] Preferably, the thickness of the inert material is 0.13-0.17 mm, more preferably 0.15 mm.

[0038] A second aspect of the present invention provides a method for preparing a positive electrode as described in the first aspect of the present invention, the method comprising:

[0039] (1) After mixing Hg2O7Sb2, silver, NiO, acetylene black and graphite powder, a solvent is added to mix and prepare a positive electrode paste. The positive electrode paste is coated on an inert material, cured and dried to obtain a positive electrode.

[0040] Preferably, the solvent includes N-methylpyrrolidone.

[0041] Preferably, the solvent is 28-35 parts by weight, more preferably 30-34 parts by weight, and even more preferably 32 parts by weight.

[0042] Preferably, the solvent is 32-36 parts by weight, more preferably 34 parts by weight.

[0043] Preferably, the weight ratio of Hg2O7Sb2 to the solvent is 0.5-5:1, more preferably 1-3:1, even more preferably 1-2:1, even more preferably 1.4-1.8:1, and most preferably 1.63:1.

[0044] Preferably, the curing temperature is 10-40℃, more preferably 10-30℃, even more preferably 20-30℃, even more preferably 23-27℃, and most preferably 25℃.

[0045] Preferably, the curing temperature is 25-35°C, and more preferably 30°C.

[0046] Preferably, the curing time is 40-60 hours, more preferably 40-55 hours, even more preferably 45-52 hours, even more preferably 46-50 hours, and most preferably 48°C.

[0047] Preferably, the curing time is 34-38 hours, and more preferably 36 hours.

[0048] Preferably, the drying temperature is 70-100℃, more preferably 70-90℃, even more preferably 75-85℃, even more preferably 78-82℃, and most preferably 80℃.

[0049] Preferably, the drying temperature is 65-75°C, more preferably 70°C.

[0050] Preferably, the drying time is 10-16 hours, more preferably 10-14 hours, even more preferably 11-13 hours, and most preferably 12 hours.

[0051] Preferably, the drying time is 13-17 hours, more preferably 15 hours.

[0052] Preferably, the positive electrode paste has a coating amount of 0.5 g / 100 cm² on the surface area of ​​the inert material. 2 Up to 2.5g / 100cm 2 The optimal concentration is 1g / 100cm³. 2 Up to 2g / 100cm 2 Better 1.2g / 100cm 2 Up to 1.8g / 100cm 2 Better 1.4g / 100cm 2Up to 1.6g / 100cm 2 The optimal concentration is 1.5g / 100cm³. 2 .

[0053] Preferably, the coating amount of the positive electrode paste on the surface area of ​​the inert material is 1.3-1.7 g / 100 cm². 2 The optimal concentration is 1.5g / 100cm³. 2 .

[0054] Preferably, the method includes:

[0055] Mix 50-54 parts by weight of Hg2O7Sb2, 1.0-1.4 parts by weight of silver, 4.3-4.7 parts by weight of NiO, 0.2-0.4 parts by weight of acetylene black and 2.3-2.7 parts by weight of graphite powder, then add 30-34 parts by weight of N-methylpyrrolidone to prepare a positive electrode paste. Coat the positive electrode paste onto an inert material, cure it at 20-30℃ for 46-50 hours, and then dry it at 78-82℃ for 11-13 hours to prepare the positive electrode.

[0056] The positive electrode paste has a coating amount of 1.3-1.7 g / 100 cm² on the surface area of ​​the inert material. 2 .

[0057] Preferably, the method includes:

[0058] 52 parts by weight of Hg2O7Sb2, 1.2 parts by weight of silver, 4.5 parts by weight of NiO, 0.3 parts by weight of acetylene black and 2.5 parts by weight of graphite powder were mixed and then 32 parts by weight of N-methylpyrrolidone were added to prepare a positive electrode paste. The positive electrode paste was coated on an inert material and cured at 25°C for 48 hours, and then dried at 80°C for 12 hours to prepare the positive electrode.

[0059] The positive electrode paste has a coating coverage of 1.5 g / 100 cm² on the surface of the inert material. 2 .

[0060] A third aspect of the present invention provides the use of the positive electrode as described in the first aspect of the present invention for the manufacture of a battery.

[0061] Preferably, the battery includes a primary battery or a rechargeable battery.

[0062] Preferably, the battery further includes a negative electrode and an electrolyte.

[0063] A fourth aspect of the present invention provides a battery comprising a positive electrode as described in the first aspect of the present invention.

[0064] Preferably, the battery includes a primary battery or a rechargeable battery.

[0065] Preferably, the battery further includes a negative electrode and an electrolyte.

[0066] Preferably, the negative electrode comprises Zn.

[0067] Preferably, the battery further includes a separator.

[0068] Preferably, the diaphragm comprises an AGM glass fiber diaphragm.

[0069] Preferably, the thickness of the diaphragm is 0.55-1.0 mm, more preferably 0.6-1.0 mm, even more preferably 0.7-0.9 mm, and most preferably 0.8 mm.

[0070] Preferably, the electrolyte comprises an aqueous solution of potassium salt.

[0071] Preferably, the electrolyte comprises an aqueous solution of potassium persulfate.

[0072] Preferably, the potassium persulfate content in the potassium persulfate aqueous solution is (2-4.5) g / 100 ml, more preferably (2.5-4.5) g / 100 ml, even more preferably (3-4.0) g / 100 ml, even more preferably (3-3.5) g / 100 ml, even more preferably (3.2-3.7) g / 100 ml, and most preferably 3.5 g / 100 ml.

[0073] Preferably, the cutoff voltage of the battery is 0.2-1.5V, more preferably 0.2-1.2V, for example 0.4-0.6V or 0.5V.

[0074] Preferably, the reaction mechanism of the battery positive electrode discharge includes:

[0075] Hg2O7Sb2=2HgO+2Sb+5O(10e).

[0076] Preferably, the reaction mechanism for charging the positive electrode of the battery includes:

[0077] 2HgO+2Sb+5O(10e)=Hg2O7Sb2.

[0078] Preferably, the battery charging and discharging reaction equations include:

[0079]

[0080] It should be understood that, within the scope of this invention, the above-described technical features of this invention and the technical features specifically described below (such as in the embodiments) can be combined with each other to form new or preferred technical solutions. Detailed Implementation

[0081] This invention develops a storage battery in which the positive electrode comprises Hg2O7Sb2. Hg2O7Sb2, as the positive electrode active material, makes the storage battery an oxygen-rich battery with high energy density and excellent low-voltage continuous discharge capability. It can still output high energy even with a cutoff voltage as low as 0.5V. Therefore, the storage battery of this invention has excellent energy density and cutoff voltage, thereby significantly improving the application value of the storage battery.

[0082] the term

[0083] As used herein, the terms “comprising,” “including,” and “containing” are used interchangeably and include not only open-ended definitions but also semi-closed and closed definitions. The terms include “consisting of” and “substantially consisting of”.

[0084] As used in this article, the term "Hg2O7Sb2" refers to mercury oxide made from antimony.

[0085] As used in this article, the term "NiO" refers to nickel oxide.

[0086] As used in this article, the term "AGM" refers to Absorbent Glass Mat.

[0087] As used in this article, the chemical formula for the term "potassium persulfate" is K2S2O8.

[0088] As used herein, the term "g / ml" refers to mass-volume concentration. For example, in an aqueous solution of potassium persulfate, a potassium persulfate content of 3.5 g / 100 ml means that 100 ml of the aqueous solution contains 3.5 g of potassium persulfate.

[0089] As used in this article, the term "cutoff voltage," also known as termination voltage, refers to the lowest operating voltage at which the battery voltage drops to the point where it should no longer discharge during battery discharge.

[0090] positive electrode

[0091] The present invention provides a positive electrode that can be used in a battery, the positive electrode comprising a positive electrode active material, wherein the positive electrode active material comprises Hg2O7Sb2.

[0092] The positive electrode active material described in this invention may also contain silver, NiO, acetylene black, and graphite powder.

[0093] Preferably, the silver includes nano-silver.

[0094] In a preferred embodiment of the present invention, the positive electrode active material includes Hg2O7Sb2, silver, NiO, acetylene black, and graphite.

[0095] In a preferred embodiment of the present invention, the Hg2O7Sb2 is 48-58 parts by weight, more preferably 50-55 parts by weight, more preferably 51-53 parts by weight, and even more preferably 52 parts by weight.

[0096] In a preferred embodiment of the present invention, the silver is 0.8-1.5 parts by weight, more preferably 1.0-1.4 parts by weight, more preferably 1.1-1.3 parts by weight, and even more preferably 1.2 parts by weight.

[0097] In a preferred embodiment of the present invention, the NiO is 3.8-5.0 parts by weight, more preferably 4.0-5.0 parts by weight, more preferably 4.3-4.7 parts by weight, and even more preferably 4.5 parts by weight.

[0098] In a preferred embodiment of the present invention, the acetylene black is 0.1-0.8 parts by weight, more preferably 0.2-0.4 parts by weight, and even more preferably 0.3 parts by weight.

[0099] In a preferred embodiment of the present invention, the graphite powder is 1-5 parts by weight, more preferably 2-3 parts by weight, and even more preferably 2.5 parts by weight.

[0100] Preferably, the weight ratio of Hg2O7Sb2 to silver is 25-65:1, more preferably 30-55:1, even more preferably 35-50:1, even more preferably 40-45:1, and most preferably 43:1.

[0101] Preferably, the weight ratio of Hg2O7Sb2 to NiO is 5-25:1, more preferably 5-20:1, even more preferably 8-16:1, even more preferably 10-14:1, and most preferably 11.6:1.

[0102] Preferably, the weight ratio of Hg2O7Sb2 to acetylene black is 150-190:1, more preferably 160-185:1, even more preferably 165-180:1, even more preferably 170-176:1, and most preferably 173:1.

[0103] Preferably, the weight ratio of Hg2O7Sb2 to graphite powder is 10-30:1, more preferably 15-30:1, even more preferably 18-25:1, even more preferably 20-22:1, and most preferably 21:1.

[0104] In a preferred embodiment of the present invention, the positive electrode active material is coated on the surface of an inert material.

[0105] Preferably, the inert material includes an inert material sheet, an inert material rod, or an inert material bar.

[0106] Preferably, the inert material includes graphite.

[0107] Preferably, the inert material includes graphite sheets, graphite rods, or graphite bars.

[0108] Preferably, the positive electrode comprises a positive electrode active material and an inert material, wherein the positive electrode active material is coated on the surface of the inert material.

[0109] Preferably, the thickness of the inert material is 0.05-0.5 mm, more preferably 0.05-0.3 mm, even more preferably 0.05-0.15 mm, and even more preferably 0.08-0.12 mm.

[0110] method

[0111] This invention provides a method for preparing the positive electrode described herein, the method comprising:

[0112] (1) After mixing Hg2O7Sb2, silver, NiO, acetylene black and graphite powder, a solvent is added to mix and prepare a positive electrode paste. The positive electrode paste is coated on an inert material, cured and dried to obtain a positive electrode.

[0113] In a preferred embodiment of the invention, the solvent comprises N-methylpyrrolidone.

[0114] Preferably, the solvent is 28-35 parts by weight, more preferably 30-34 parts by weight, and even more preferably 32 parts by weight.

[0115] In a preferred embodiment of the present invention, the weight ratio of Hg2O7Sb2 to the solvent is 0.5-5:1, more preferably 1-3:1, more preferably 1-2:1, more preferably 1.4-1.8:1, and most preferably 1.63:1.

[0116] Typically, the method includes:

[0117] Mix 50-54 parts by weight of Hg2O7Sb2, 1.0-1.4 parts by weight of silver, 4.3-4.7 parts by weight of NiO, 0.2-0.4 parts by weight of acetylene black and 2.3-2.7 parts by weight of graphite powder, then add 30-34 parts by weight of N-methylpyrrolidone to prepare a positive electrode paste. Coat the positive electrode paste onto an inert material, cure it at 20-30℃ for 46-50 hours, and then dry it at 78-82℃ for 11-13 hours to prepare the positive electrode.

[0118] The positive electrode paste has a coating amount of 1.3-1.7 g / 100 cm² on the surface area of ​​the inert material. 2 .

[0119] Typically, the method includes:

[0120] 52 parts by weight of Hg2O7Sb2, 1.2 parts by weight of silver, 4.5 parts by weight of NiO, 0.3 parts by weight of acetylene black and 2.5 parts by weight of graphite powder were mixed and then 32 parts by weight of N-methylpyrrolidone were added to prepare a positive electrode paste. The positive electrode paste was coated on an inert material and cured at 25°C for 48 hours, and then dried at 80°C for 12 hours to prepare the positive electrode.

[0121] The positive electrode paste has a coating coverage of 1.5 g / 100 cm² on the surface of the inert material. 2 .

[0122] use

[0123] The present invention also provides an application of the positive electrode described herein for the manufacture of batteries.

[0124] The battery described in this invention can be a primary battery or a rechargeable battery.

[0125] Preferably, the battery further includes a negative electrode and an electrolyte.

[0126] Battery

[0127] The present invention also provides a battery comprising a positive electrode as described in the present invention.

[0128] The battery described in this invention can be a primary battery or a rechargeable battery.

[0129] In a preferred embodiment of the present invention, the battery further includes a negative electrode and an electrolyte.

[0130] Preferably, the negative electrode comprises Zn.

[0131] Preferably, the battery further includes a separator.

[0132] Preferably, the diaphragm comprises an AGM glass fiber diaphragm.

[0133] Preferably, the thickness of the diaphragm is 0.55-1.0 mm, more preferably 0.6-1.0 mm, even more preferably 0.7-0.9 mm, and most preferably 0.8 mm.

[0134] In a preferred embodiment of the present invention, the electrolyte comprises an aqueous solution of potassium salt.

[0135] Preferably, the electrolyte comprises an aqueous solution of potassium persulfate.

[0136] Preferably, the potassium persulfate content in the potassium persulfate aqueous solution is (2-4.5) g / 100 ml, more preferably (2.5-4.5) g / 100 ml, even more preferably (3-4.0) g / 100 ml, even more preferably (3-3.5) g / 100 ml, even more preferably (3.2-3.7) g / 100 ml, and most preferably 3.5 g / 100 ml.

[0137] Preferably, the cutoff voltage of the battery is 0.2-1.5V, more preferably 0.2-1.2V, for example 0.4-0.6V.

[0138] Preferably, the reaction mechanism of the battery positive electrode discharge includes:

[0139] Hg2O7Sb2=2HgO+2Sb+5O(10e).

[0140] Preferably, the reaction mechanism for charging the positive electrode of the battery includes:

[0141] 2HgO+2Sb+5O(10e)=Hg2O7Sb2.

[0142] Preferably, the battery charging and discharging reaction equations include:

[0143]

[0144] The main technical effects achieved by this invention include:

[0145] 1. This invention develops a battery positive electrode, wherein the positive electrode comprises Hg2O7Sb2. A battery prepared with Hg2O7Sb2 as the positive electrode active material becomes an oxygen-rich battery, which has high energy density and excellent low-voltage continuous discharge capability. It can still output high energy even with a cutoff voltage as low as 0.5V. Therefore, the battery of this invention has excellent energy density and cutoff voltage, thereby significantly improving the application value of the battery.

[0146] 2. The battery described in this invention has high safety performance. After being punctured, the battery will not catch fire or explode. It also has low requirements for the production environment and can be produced without special protective treatment of the production workshop.

[0147] Example 1: Storage Battery

[0148] This embodiment 1 describes the preparation of a storage battery, and the specific method is as follows:

[0149] (1) Preparation of positive electrode plate:

[0150] A positive electrode paste was prepared by mixing 52 parts by weight of Hg₂O₇Sb₂, 1.2 parts by weight of nano-silver, 4.5 parts by weight of NiO, 0.3 parts by weight of acetylene black, and 2.5 parts by weight of graphite powder, and then adding 32 parts by weight of N-methylpyrrolidone. The positive electrode paste was then coated onto a 0.1 mm graphite sheet (the coating amount of the positive electrode paste on the graphite surface area was 1.5 g / 100 cm²). 2 The positive electrode plate is prepared by curing at 25°C for 48 hours and then drying at 80°C for 12 hours.

[0151] (2) The negative electrode plate is a Zn plate.

[0152] (3) The diaphragm is an AGM glass fiber diaphragm with a thickness of 0.8 mm.

[0153] (4) Use a diaphragm to wrap the positive and negative plates separately, and form a battery unit by alternating positive and negative plates. Add potassium persulfate aqueous solution (wherein, the content of potassium persulfate in the potassium persulfate aqueous solution is 3.5g / 100ml) to encapsulate and make a storage battery.

[0154] Energy value test: Constant current discharge test was performed using an 8-channel battery analyzer, and the discharge capacity was obtained by 20h rate test in accordance with the standard GBT19639.1-2014 General Valve-Regulated Lead-Acid Battery Part 1: Technical Conditions.

[0155] The discharge capacity and power of the battery in this embodiment 1 are shown in Table 1 below:

[0156] Table 1. Discharge capacity and power of storage batteries

[0157] Cut-off voltage mAh mWh mAh / g mWh / g 1.2V 233.56 310.81 432.52 575.75 1.0V 278.75 361.82 516.20 670.04 0.5V 1451.99 1096.75 2688.87 1979.17

[0158] As can be seen from Table 1, the battery prepared in Example 1 has excellent energy density (up to 1000 mAh / g or more) and excellent low-voltage continuous discharge capability, and can still output high energy even with a cutoff voltage as low as 0.5V.

[0159] The battery in this embodiment 1 has high safety performance. After a puncture test on the battery sample, it was found that it would not catch fire or explode.

[0160] The production environment requirements for the battery in this embodiment 1 are not high, and it can be produced without special protective treatment of the production workshop.

[0161] Example 2: Storage Battery

[0162] The battery in Example 2 is the same as that in Example 1, except that: Step (1):

[0163] (1) Preparation of positive electrode plate:

[0164] A positive electrode paste was prepared by mixing 50 parts by weight of Hg₂O₇Sb₂, 0.9 parts by weight of nano-silver, 5 parts by weight of NiO, 0.5 parts by weight of acetylene black, and 2 parts by weight of graphite powder, and then adding 34 parts by weight of N-methylpyrrolidone. The positive electrode paste was then coated onto a 0.15 mm graphite sheet (the coating amount of the positive electrode paste on the graphite surface area was 1.5 g / 100 cm²). 2 The positive electrode plate is prepared by curing at 30℃ for 36 hours and then drying at 70℃ for 15 hours.

[0165] Energy value test: Constant current discharge test was performed using an 8-channel battery analyzer, and the discharge capacity was obtained by 20h rate test in accordance with the standard GBT19639.1-2014 General Valve-Regulated Lead-Acid Battery Part 1: Technical Conditions.

[0166] The discharge capacity and power of the battery in this embodiment 2 are shown in Table 2 below:

[0167] Table 2. Discharge capacity and power of batteries

[0168] Cut-off voltage mAh mWh mAh / g mWh / g 1.2V 99.33 135.19 183.66 244.75 1.0V 131.11 141.35 197.27 267.37 0.5V 575.52 427.06 1178.68 805.50

[0169] The battery in this embodiment 2 has high safety performance. After a puncture test on the battery sample, it was found that it would not catch fire or explode.

[0170] The production environment requirements for the battery in this embodiment 2 are not high, and it can be produced without special protective treatment of the production workshop.

[0171] Example 3: Storage Battery

[0172] The battery in Example 3 is the same as that in Example 1, except that: step (4):

[0173] (4) Use a diaphragm to wrap the positive and negative plates separately, and form a battery unit by alternating positive and negative plates. Add potassium persulfate aqueous solution (wherein, the potassium persulfate content in the potassium persulfate aqueous solution is 3.0g / 100ml) to encapsulate and make a storage battery.

[0174] Energy value test: Constant current discharge test was performed using an 8-channel battery analyzer, and the discharge capacity was obtained by 20h rate test in accordance with the standard GBT19639.1-2014 General Valve-Regulated Lead-Acid Battery Part 1: Technical Conditions.

[0175] The discharge capacity and power of the battery in this embodiment 3 are shown in Table 3 below:

[0176] Table 3. Discharge capacity and power of batteries

[0177] Cut-off voltage mAh mWh mAh / g mWh / g 1.2V 110.34 148.50 204.33 275 1.0V 118.54 157.77 219.52 292.17 0.5V 654.74 486.09 1212.48 900.17

[0178] The battery in this embodiment 3 has high safety performance: after a puncture test on the battery sample, it will not catch fire or explode.

[0179] The production environment requirements for the battery in this embodiment 3 are not high, and it can be produced without special protective treatment of the production workshop.

[0180] Example 4: Storage Battery

[0181] The battery in Example 4 is the same as that in Example 1, except that: step (4):

[0182] (4) Use a diaphragm to wrap the positive and negative plates separately, and form a battery unit by alternating positive and negative plates. Add potassium persulfate aqueous solution (wherein, the content of potassium persulfate in the potassium persulfate aqueous solution is 1.0g / 100ml) to encapsulate and make a storage battery.

[0183] Energy value test: Constant current discharge test was performed using an 8-channel battery analyzer, and the discharge capacity was obtained by 20h rate test in accordance with the standard GBT19639.1-2014 General Valve-Regulated Lead-Acid Battery Part 1: Technical Conditions.

[0184] The discharge capacity and power of the battery in Example 4 are shown in Table 4 below:

[0185] Table 4. Discharge capacity and power of batteries

[0186] Cut-off voltage mAh mWh mAh / g mWh / g 1.2V 87.96 117.33 146.6 195.55 1.0V 108.28 129.36 184.47 215.6 0.5V 383.03 383.8 638.38 639.67

[0187] Example 5: Storage Battery

[0188] This embodiment 5 prepares a storage battery in the same way as embodiment 1, except that: step (1) preparation of the positive electrode plate:

[0189] (1) Preparation of positive electrode plate:

[0190] A positive electrode paste was prepared by mixing 52 parts by weight of Hg₂O₇Sb₂, 0.4 parts by weight of nano-silver, 4.5 parts by weight of NiO, 0.3 parts by weight of acetylene black, and 2.5 parts by weight of graphite powder, and then adding 32 parts by weight of N-methylpyrrolidone. The positive electrode paste was then coated onto a 0.1 mm graphite sheet (the coating amount of the positive electrode paste on the graphite surface area was 1.5 g / 100 cm²). 2 The positive electrode plate is prepared by curing at 25°C for 48 hours and then drying at 80°C for 12 hours.

[0191] Energy value test: Constant current discharge test was performed using an 8-channel battery analyzer, and the discharge capacity was obtained by 20h rate test in accordance with the standard GBT19639.1-2014 General Valve-Regulated Lead-Acid Battery Part 1: Technical Conditions.

[0192] The discharge capacity and power of the battery in Example 5 are shown in Table 5 below:

[0193] Table 5. Discharge capacity and power of batteries

[0194] Cut-off voltage mAh mWh mAh / g mWh / g 1.2V 132.58 130.79 254.96 251.52 1.0V 197.63 190.46 380.06 366.27 0.5V 462.77 433.87 889.94 843.37

[0195] The battery in Example 5 has high safety performance: after a puncture test on the battery sample, it did not catch fire or explode.

[0196] The battery in this embodiment 5 has low requirements for the production environment and can be produced without special protective treatment of the production workshop.

[0197] Example 6: Storage Battery

[0198] This embodiment 6 prepares a storage battery in the same way as embodiment 1, except that: step (1) preparation of the positive electrode plate:

[0199] (1) Preparation of positive electrode plate:

[0200] A positive electrode paste was prepared by mixing 52 parts by weight of Hg₂O₇Sb₂, 1.2 parts by weight of nano-silver, 10 parts by weight of NiO, 0.3 parts by weight of acetylene black, and 2.5 parts by weight of graphite powder, and then adding 32 parts by weight of N-methylpyrrolidone. The positive electrode paste was then coated onto a 0.1 mm graphite sheet (the coating amount of the positive electrode paste on the graphite surface area was 1.5 g / 100 cm²). 2 The positive electrode plate is prepared by curing at 25°C for 48 hours and then drying at 80°C for 12 hours.

[0201] Energy value test: Constant current discharge test was performed using an 8-channel battery analyzer, and the discharge capacity was obtained by 20h rate test in accordance with the standard GBT19639.1-2014 General Valve-Regulated Lead-Acid Battery Part 1: Technical Conditions.

[0202] The discharge capacity and power of the battery in Example 6 are shown in Table 6 below:

[0203] Table 6. Discharge Capacity and Power of Batteries

[0204] Cut-off voltage mAh mWh mAh / g mWh / g 1.2V 197.46 206.28 479.27 500.68 1.0V 442.99 540.63 1075.22 1312.20 0.5V 553.49 626.39 1343.42 1520.36

[0205] The battery in this embodiment 6 has high safety performance: after a puncture test on the battery sample, it will not catch fire or explode.

[0206] The battery in this embodiment 6 has low requirements for the production environment and can be produced without special protective treatment of the production workshop.

[0207] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A positive electrode, characterized in that, The positive electrode is either the positive electrode of a primary battery or the positive electrode of a storage battery; the positive electrode includes a positive electrode active material, which includes Hg2O7Sb2, silver, NiO, acetylene black and graphite powder; The weight ratio of Hg2O7Sb2 to silver is 25-65:1; The weight ratio of Hg2O7Sb2 to NiO is 5-25:1; The weight ratio of Hg2O7Sb2 to acetylene black is 150-190:1; The weight ratio of Hg2O7Sb2 to graphite powder is 10-30:1; The positive electrode active material is coated on the surface of an inert material; the inert material includes graphite sheets, graphite rods, or graphite bars.

2. The positive electrode as described in claim 1, characterized in that, The weight ratio of Hg2O7Sb2 to silver is 30-55:1; The weight ratio of Hg2O7Sb2 to NiO is 5-20:1; The weight ratio of Hg2O7Sb2 to acetylene black is 160-185:1; The weight ratio of Hg2O7Sb2 to graphite powder is 15-30:

1.

3. The positive electrode as described in claim 1, characterized in that, The weight ratio of Hg2O7Sb2 to silver is 35-50:1; The weight ratio of Hg2O7Sb2 to NiO is 8-16:1; The weight ratio of Hg2O7Sb2 to acetylene black is 165-180:1; The weight ratio of Hg2O7Sb2 to graphite powder is 18-25:

1.

4. The positive electrode as described in claim 1, characterized in that, The weight ratio of Hg2O7Sb2 to silver is 40-45:1; The weight ratio of Hg2O7Sb2 to NiO is 10-14:1; Preferably, the weight ratio of Hg2O7Sb2 to acetylene black is 170-176:1; Preferably, the weight ratio of Hg2O7Sb2 to graphite powder is 20-22:

1.

5. The positive electrode as described in claim 1, characterized in that, The weight ratio of Hg2O7Sb2 to silver is 43:1; The weight ratio of Hg2O7Sb2 to NiO is 11.6:1; The weight ratio of Hg2O7Sb2 to acetylene black is 173:1; The weight ratio of Hg2O7Sb2 to graphite powder is 21:

1.

6. A method for preparing the positive electrode as described in claim 1, the method comprising: Hg2O7Sb2, silver, NiO, acetylene black and graphite powder are mixed and then a solvent is added to prepare a positive electrode slurry. The positive electrode slurry is then coated onto an inert material, cured and dried to obtain the positive electrode.

7. The method as described in claim 6, characterized in that, The solvent includes N-methylpyrrolidone.

8. The method as described in claim 6, characterized in that, The method includes: Mix 50-54 parts by weight of Hg2O7Sb2, 1.0-1.4 parts by weight of silver, 4.3-4.7 parts by weight of NiO, 0.2-0.4 parts by weight of acetylene black and 2.3-2.7 parts by weight of graphite powder, and then add 30-34 parts by weight of N-methylpyrrolidone to prepare a positive electrode slurry. The positive electrode slurry is coated on an inert material and cured at 20-30℃ for 46-50 hours, and then dried at 78-82℃ for 11-13 hours to prepare the positive electrode. The coating amount of the positive electrode slurry on the surface of the inert material is 1.3-1.7 g / 100 cm². 2 .

9. The method as described in claim 8, characterized in that, The method includes: 52 parts by weight of Hg2O7Sb2, 1.2 parts by weight of silver, 4.5 parts by weight of NiO, 0.3 parts by weight of acetylene black and 2.5 parts by weight of graphite powder were mixed and then 32 parts by weight of N-methylpyrrolidone were added to prepare a positive electrode slurry. The positive electrode slurry was coated on an inert material, cured at 25°C for 48 hours, and then dried at 80°C for 12 hours to prepare the positive electrode. The positive electrode slurry has a coating amount of 1.5 g / 100 cm² on the surface of the inert material. 2 .