Stable pouch battery and process for preparing the same

Abstract

The application relates to a stable soft package battery and a preparation process thereof, and relates to the technical field of soft package batteries. The stable soft package battery comprises a LATP-coated LNCMAO positive electrode material. The LATP-coated LNCMAO positive electrode material is an LNCMAO positive electrode material coated with a LATP coating on the surface. The general formula of the LNCMAO positive electrode material is LiNi0.83Co0.06Mn0.06Al0.05O2. The LATP coating is made of a Li1.3Al0.3Ti1.7(PO4)3 material. The weight percentage of the LATP coating and the LNCMAO positive electrode material is 1wt%-3wt%. The application makes the soft package battery prepared by using the LATP-coated LNCMAO positive electrode material more stable, improves the safety of the soft package battery, and unexpectedly improves the initial coulomb efficiency and cycle performance of the LATP-coated LNCMAO positive electrode material, and improves the long-term use performance of the soft package battery.

Description

Technical Field

[0001] This application relates to the technical field of pouch batteries, and in particular to a pouch battery with stable application and its manufacturing process. Background Technology

[0002] Currently, in order to reduce the use of fossil fuels, countries around the world are vigorously developing new energy sources, especially lithium batteries, which have made great strides and been widely used in recent years, and are of great significance for reducing carbon emissions.

[0003] There are many types of lithium batteries, and pouch batteries are one of the more widely used. Pouch lithium batteries consist of a liquid lithium-ion battery encased in a polymer shell, structurally packaged in an aluminum-plastic film. In the event of a safety hazard, a pouch battery may swell and crack.

[0004] Regarding the aforementioned technologies, the inventors believe it is necessary to improve the safety performance of pouch batteries and reduce the safety hazards of pouch batteries bulging and cracking. Summary of the Invention

[0005] The purpose of this application is to provide a stable pouch battery and its manufacturing process to improve the safety performance of pouch batteries.

[0006] Firstly, the application provides a stable soft-pack battery with the following technical solution:

[0007] A stable pouch cell includes an LATP-coated LNCMAO cathode material, wherein the LATP-coated LNCMAO cathode material is an LNCMAO cathode material with an LATP coating on its surface, and the general formula of the LNCMAO cathode material is LiNi. 0.83 Co 0.06 Mn 0.06 Al 0.05 O2, the LATP coating is made of Li 1.3 Al 0.3 Ti 1.7 The material is (PO4)3, and the LATP coating is 1wt%-3wt% of the weight percentage of the LNCMAO cathode material.

[0008] By adopting the above technical solution, and by limiting the general formula of LNCMAO cathode material to the aforementioned range, and by coating the LNCMAO cathode material with an LATP coating, the LATP-coated LNCMAO cathode material exhibits a highly ordered layered hexagonal structure. Due to the use of Li... 1.3 Al 0.3 Ti 1.7(PO4)3 material is used as the LATP coating, and the weight percentage of the LATP coating to the LNCMAO cathode material is limited to the above range. The LATP coating can introduce an appropriate amount of Ti into the crystal structure of the LNCMAO cathode material. 4+ This helps stabilize the layered structure and reduce Ni during charging and discharging. 2+ and Li + The mixing of cations enhances the hexagonal ordered structure of the prepared LATP-coated LNCMAO cathode material. Therefore, this application can maintain the stability of the crystal structure of the LATP-coated LNCMAO cathode material, making the pouch battery prepared using the LATP-coated LNCMAO cathode material of this application more stable and improving the safety of the pouch battery.

[0009] In addition, the inventors unexpectedly discovered that adopting the above-mentioned scheme is also beneficial to improving the initial coulombic efficiency and cycle performance of the LATP-coated LNCMAO cathode material. This allows the pouch battery prepared using the LATP-coated LNCMAO cathode material of this application to retain more than 85% of its original energy storage capacity after multiple uses, thereby improving the long-term performance of the pouch battery and helping to extend its service life.

[0010] In one specific implementation, the thickness of the LATP coating is 10-20 nm.

[0011] By adopting the above technical solution, the inventors discovered through experiments that when the thickness of the LATP coating is controlled within the above range, the prepared LATP-coated LNCMAO cathode material has higher initial coulombic efficiency and cycle performance as well as a more stable lattice structure. This indicates that controlling the thickness of the LATP coating within the above range helps to further improve the safety performance and long-term use performance of the soft-pack battery.

[0012] In one specific implementation, the LATP coating has a weight percentage of 1.8-2.2 wt% to the LNCMAO cathode material.

[0013] By adopting the above technical solution, the inventors unexpectedly discovered that when the weight percentage of LATP coating to LNCMAO cathode material is controlled at around 2wt%, the LATP-coated LNCMAO cathode material has a more stable crystal structure, higher initial coulombic efficiency and cycle performance. The prepared pouch battery is safer, has a longer service life, and has a larger discharge capacity.

[0014] In one specific implementation, the LNCMAO cathode material is made from raw materials comprising the following parts by weight: 40-98 parts LiNO3·H2O, 145-242 parts Ni(NO3)2·6H2O, 14-24 parts Co(NO3)2·6H2O, 12-22 parts Mn(NO3)2·4H2O, 11-23 parts Al(NO3)3·9H2O, 740-1365 parts purified water, 22-41 parts LiNO3, 10-30 parts citric acid, and 0-30 parts NH3·H2O.

[0015] By adopting the above technical solution, the inventors discovered that using the above raw materials and proportions helps to improve the efficiency of LiNi. 0.83 Co 0.06 Mn 0.06 Al 0.05 The increased yield of O2 helps improve the stability of the hexagonal ordered structure of LNCMAO cathode materials. Furthermore, all of these raw materials are readily available, facilitating industrial-scale production.

[0016] In one specific feasible implementation, the Li 1.3 Al 0.3 Ti 1.7 (PO4)3 material is made from the following raw materials in parts by weight: 875-2625 parts Ti(OC4H9)4, 1500-4000 parts C2H6O, 525-1575 parts NH4H2PO4, 17-51 parts Al(NO3)3·9H2O, and 13-39 parts LiNO3·H2O.

[0017] By adopting the above technical solution and using C2H6O, it is easy to dissolve other raw materials to form a suspension, which facilitates thorough mixing with LNCMAO cathode material and encapsulates LNCMAO cathode material, thus helping to prepare LATP-coated LNCMAO cathode material.

[0018] Secondly, the fabrication process of a stable soft-pack battery provided in this application adopts the following technical solution: A fabrication process of a stable soft-pack battery includes the following steps:

[0019] According to the formula, LiNO3·H2O, Ni(NO3)2·6H2O, Co(NO3)2·6H2O, Mn(NO3)2·4H2O and Al(NO3)3·9H2O are dispersed in pure water to obtain a raw material aqueous solution. LiNO3 and citric acid are added to the raw material aqueous solution, and after stirring, NH3·H2O is added to obtain a whole solution. The excess solvent in the whole solution is evaporated to obtain a gel. The gel is rinsed and calcined to obtain LNCMAO powder.

[0020] Ti(OC4H9)4 was dissolved in a portion of C2H6O to obtain a Ti(OC4H9)4 / C2H6O solution; NH4H2PO4, Al(NO3)3·9H2O, and LiNO3·H2O were dissolved in another portion of C2H6O to obtain a mixed solution; the mixed solution was added to the Ti(OC4H9)4 / C2H6O solution, and the mixture was stirred continuously while reducing C2H6O2 to obtain a suspension;

[0021] LNCMAO powder was added to a suspension under vigorous stirring to obtain a mixed system. The mixed system was then placed in a water bath for 5 hours to form a sol. The sol was heated to obtain a compound. The compound was then ball-milled and heated to obtain LATP-coated LNCMAO cathode material.

[0022] A pouch cell was fabricated by coating LNCMAO cathode material with LATP, resulting in a pouch cell with stable performance in applications.

[0023] By adopting the above technical solution, this application first prepares LNCMAO powder, then prepares the raw materials for LATP coating into a suspension, disperses the LNCMAO powder in the suspension, and then uses the sol-gel method, which helps to prepare LNCMAO cathode material with a uniform LATP coating on the surface, and helps to improve the stability of the hexagonal ordered structure of LNCMAO cathode material.

[0024] In one specific feasible implementation, when the overall solution pH is 9.0, excess solvent is evaporated under a water bath at 80-90°C to obtain a gel.

[0025] By adopting the above technical solution, the inventors unexpectedly discovered that under the conditions of an overall solution pH of 9.0 and a water bath at 80-90℃, it is helpful to obtain gel quickly, and it is also helpful for the uniform mixing and reaction of the raw materials, which is beneficial to obtaining LNCMAO cathode material with a hexagonal ordered structure.

[0026] In one specific feasible implementation, the gel is washed and calcined at 105-115°C for 9-12 hours, then calcined at 450-550°C for 5-7 hours, and finally calcined at 800-900°C under O2 conditions for 10-14 hours to obtain LNCMAO powder.

[0027] By adopting the above technical solution, the inventors discovered that after treating the gel according to the above process steps and conditions, the obtained LNCMAO powder has a stable hexagonal ordered structure, and the yield is high, which helps to improve production efficiency.

[0028] In one specific feasible embodiment, the sol is heated at 115-125℃ for 10-14h to obtain a compound. After ball milling, the compound is heated at 480-520℃ in an Ar2 atmosphere for 3.5-4.5h, and then heated at 780-820℃ in an Ar2 atmosphere for 1.8-2.2h to obtain LATP-coated LNCMAO cathode material.

[0029] By adopting the above technical solution, the inventors discovered that processing the sol according to the above process steps and process adjustment helps to form a uniform LATP coating on the surface of LNCMAO powder, which is beneficial to obtaining LATP-coated LNCMAO cathode material. Moreover, LATP-coated LNCMAO cathode material has a more stable crystal structure, higher initial coulombic efficiency and cycle performance.

[0030] In one specific feasible implementation, the pH of the suspension is adjusted to neutral.

[0031] By adopting the above technical solution, the inventors unexpectedly discovered that after adjusting the pH value of the suspension to neutral, the LATP-coated LNCMAO cathode material prepared has a more uniform LATP coating on the surface of the LNCMAO cathode material and a more stable crystal structure.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. This application can maintain the stability of the crystal structure of LATP-coated LNCMAO cathode material, making the pouch battery prepared using the LATP-coated LNCMAO cathode material of this application more stable, improving the safety of the pouch battery, and unexpectedly improving the initial coulombic efficiency and cycle performance of LATP-coated LNCMAO cathode material, thus improving the long-term performance of the pouch battery.

[0034] 2. The LATP coating of this application has a weight percentage of 2wt% to LNCMAO cathode material. The LATP-coated LNCMAO cathode material has a more stable lattice structure, higher initial coulombic efficiency and cycle performance. The prepared soft-pack battery is safer, has a longer service life and a larger discharge capacity.

[0035] 3. The preparation process of this application helps to produce LNCMAO cathode materials with a uniform LATP coating on the surface, which helps to improve the stability of the hexagonal ordered structure of LNCMAO cathode materials. Attached Figure Description

[0036] Figure 1 These are line graphs of the long-term use performance test results for comparative examples, Example 1, and Examples 4-5 of this application;

[0037] Figure 2 These are the XRD patterns of the comparative examples, Example 1, and Examples 4-5 of this application;

[0038] Figure 3 This is the refined XRD Rietveld spectrum of Comparative Example 1 of this application;

[0039] Figure 4 This is the refined XRD Rietveld spectrum of Embodiment 1 of this application;

[0040] Figure 5 This is a transmission electron microscope image of Embodiment 1 of this application. Detailed Implementation

[0041] The following combination Figure 1-5 The present application will be further described in detail with reference to the embodiments.

[0042] Example

[0043] Example 1

[0044] This embodiment provides a stable pouch cell, comprising an LATP-coated LNCMAO cathode material. The LATP-coated LNCMAO cathode material includes an LATP coating and an LNCMAO cathode material. The LATP coating is applied to the surface of the LNCMAO cathode material, and the thickness of the LATP coating is between 10-20 nm. The LATP coating is made of Li... 1.3 Al 0.3 Ti 1.7 The layer formed by (PO4)3 material, and the LNCMAO cathode material is LiNi. 0.83 Co 0.06 Mn 0.06 Al 0.05 O2 materials.

[0045] The LNCMAO cathode material in this embodiment includes the following raw materials by weight: 69 kg LiNO3·H2O, 193.5 kg Ni(NO3)2·6H2O, 19 kg Co(NO3)2·6H2O, 17 kg Mn(NO3)2·4H2O, 17 kg Al(NO3)3·9H2O, 1052.5 kg purified water, 31.5 kg LiNO3, 20 kg citric acid, and 19.6 kg NH3·H2O.

[0046] The LATP coating in this embodiment comprises the following raw materials by weight: 1.75 kg Ti(OC4H9)4, 2.75 kg C2H6O, 1.05 kg NH4H2PO4, 0.34 kg Al(NO3)3·9H2O, and 0.26 kg LiNO3·H2O.

[0047] This embodiment also provides a manufacturing process for a stable pouch cell, including the following steps:

[0048] According to the formula, pure water is added to the reaction vessel. While stirring, LiNO3·H2O, Ni(NO3)2·6H2O, Co(NO3)2·6H2O, Mn(NO3)2·4H2O and Al(NO3)3·9H2O are added to the reaction vessel. Stirring is continued until the mixture is evenly dispersed to obtain the raw material aqueous solution.

[0049] Then, LiNO3 and citric acid were added to the raw material aqueous solution, and after stirring, NH3·H2O was added to the reaction vessel to obtain a complete solution. The complete solution was stirred continuously, and when the pH of the complete solution reached 9.0, the excess solvent in the complete solution was evaporated under a water bath at 85°C to obtain a gel.

[0050] The gel was then rinsed and calcined at 110°C for 10 hours, then calcined at 500°C for 6 hours, and then calcined at 850°C and O2 for 12 hours to obtain LNCMAO powder.

[0051] Then, Ti(OC4H9)4 was dissolved in a portion of C2H6O and stirred until homogeneous to obtain a Ti(OC4H9)4 / C2H6O solution. Next, NH4H2PO4, Al(NO3)3·9H2O, and LiNO3·H2O were added to another portion of C2H6O and mixed thoroughly to obtain a mixed solution. This mixed solution was then added to the Ti(OC4H9)4 / C2H6O solution, and after continuous stirring, the solution was heated at 95°C to evaporate and remove some of the C2H6O2. The pH of the solution was adjusted to 7 to obtain a suspension.

[0052] Under vigorous stirring, LNCMAO powder was added to the suspension and stirred until homogeneous to obtain a mixed system. The mixed system was then placed in a water bath at 80°C for 5 hours to form a sol.

[0053] The sol was then placed in a drying oven, and the temperature inside the drying oven was adjusted to 120°C. After heating for 12 hours, the compound was obtained.

[0054] The compound was ball-milled into powder, heated at 500℃ and Ar2 atmosphere for 4 hours, and then heated at 800℃ and Ar2 atmosphere for 2 hours to obtain LATP-coated LNCMAO cathode material.

[0055] The LATP-coated LNCMAO cathode material obtained above is then used as the cathode of the battery to prepare a pouch cell, thus obtaining a stable pouch cell.

[0056] Example 2

[0057] This embodiment provides a stable soft-pack battery. The difference between this embodiment and Embodiment 1 is that the raw material composition of the LNCMAO cathode material in this embodiment is as follows: 40kg LiNO3·H2O, 145kg Ni(NO3)2·6H2O, 14kg Co(NO3)2·6H2O, 12kg Mn(NO3)2·4H2O, 11kg Al(NO3)3·9H2O, 740kg purified water, 22kg LiNO3, 10kg citric acid, and 12.6kg NH3·H2O.

[0058] Example 3

[0059] This embodiment provides a stable soft-pack battery. The difference between this embodiment and Embodiment 1 is that the raw material composition of the LNCMAO cathode material in this embodiment is as follows: 98kg LiNO3·H2O, 242kg Ni(NO3)2·6H2O, 24kg Co(NO3)2·6H2O, 22kg Mn(NO3)2·4H2O, 23kg Al(NO3)3·9H2O, 1365kg purified water, 41kg LiNO3, 30kg citric acid, and 29.6kg NH3·H2O.

[0060] Example 4

[0061] This embodiment provides a stable soft-pack battery. The difference between this embodiment and Embodiment 1 is that the raw material ratio of the LATP coating in this embodiment is as follows: 0.875kg Ti(OC4H9)4, 1.375kg C2H6O, 0.525kg NH4H2PO4, 0.17kg Al(NO3)3·9H2O, and 0.13kg LiNO3·H2O.

[0062] Example 5

[0063] This embodiment provides a stable soft-pack battery. The difference between this embodiment and Embodiment 1 is that the raw material ratio of the LATP coating in this embodiment is as follows: 2.625kg Ti(OC4H9)4, 4.125kg C2H6O, 1.575kg NH4H2PO4, 0.51kg Al(NO3)3·9H2O, and 0.39kg LiNO3·H2O.

[0064] Example 6

[0065] This embodiment provides a stable soft-pack battery. The difference between this embodiment and Embodiment 1 is that when the overall solution pH is 8.0, excess solvent is evaporated under 85°C water bath conditions to obtain a gel.

[0066] Example 7

[0067] This embodiment provides a stable soft-pack battery. The difference between this embodiment and Embodiment 1 is that when the overall solution pH value is 10.0, excess solvent is evaporated under 85°C water bath conditions to obtain a gel.

[0068] Example 8

[0069] This embodiment provides a stable soft-pack battery. The difference between this embodiment and Embodiment 1 is that when the overall solution pH is 9.0, excess solvent is evaporated under 80°C water bath conditions to obtain a gel.

[0070] Example 9

[0071] This embodiment provides a stable soft-pack battery. The difference between this embodiment and Embodiment 1 is that when the overall solution pH is 9.0, excess solvent is evaporated under a 90°C water bath to obtain a gel.

[0072] Example 10

[0073] This embodiment provides a stable soft-pack battery. The difference between this embodiment and Embodiment 1 is that the gel is rinsed and calcined at 105°C for 12 hours, then calcined at 450°C for 7 hours, and then calcined at 900°C and O2 for 14 hours to obtain LNCMAO powder.

[0074] Example 11

[0075] This embodiment provides a stable soft-pack battery. The difference between this embodiment and Embodiment 1 is that the gel is rinsed and calcined at 115°C for 9 hours, then calcined at 550°C for 5 hours, and then calcined at 800°C and O2 for 10 hours to obtain LNCMAO powder.

[0076] Example 12

[0077] This embodiment provides a stable soft-pack battery. The difference between this embodiment and Embodiment 1 is that when the pH of the solution is adjusted to 6, a suspension is obtained.

[0078] Example 13

[0079] This embodiment provides a stable soft-pack battery. The difference between this embodiment and Embodiment 1 is that when the pH of the solution is adjusted to 8, a suspension is obtained.

[0080] Example 14

[0081] This embodiment provides a stable pouch cell. The difference between this embodiment and Embodiment 1 is that the sol is placed in a drying oven, the temperature of which is adjusted to 115°C, and heated for 14 hours to obtain the compound. The compound is ball-milled into powder, heated at 480°C in an Ar2 atmosphere for 4.5 hours, and then heated at 780°C in an Ar2 atmosphere for 2.2 hours to obtain the LATP-coated LNCMAO cathode material.

[0082] Example 15

[0083] This embodiment provides a stable pouch cell. The difference between this embodiment and Embodiment 1 is that the sol is placed in a drying oven, the temperature of which is adjusted to 125°C, and heated for 10 hours to obtain the compound. The compound is ball-milled into powder, heated at 520°C in an Ar2 atmosphere for 3.5 hours, and then heated at 820°C in an Ar2 atmosphere for 1.8 hours to obtain the LATP-coated LNCMAO cathode material.

[0084] Comparative Example

[0085] Comparative Example 1

[0086] This comparative example provides a pouch cell. The difference between this comparative example and Example 1 is that it uses LiNi. 0.83 Co 0.06 Mn 0.06 Al 0.05 O2 material is used as the positive electrode of the battery.

[0087] Comparative Example 2

[0088] This comparative example provides a pouch cell. The difference between this comparative example and Example 1 is that, in the stable pouch cell manufacturing process of this comparative example, an equal amount of LiNi is used. 0.18 Co 0.18 Mn 0.61 Al 0.03 O 2.4 Replace LNCMAO powder with powder.

[0089] Comparative Example 3

[0090] This comparative example provides a soft-pack battery. The difference between this comparative example and Example 1 is that the raw material composition of the LATP coating in this comparative example is as follows: 0.5kg Ti(OC4H9)4, 1.0kg C2H6O, 0.3kg NH4H2PO4, 0.1kg Al(NO3)3·9H2O, and 0.1kg LiNO3·H2O.

[0091] Comparative Example 3

[0092] This comparative example provides a soft-pack battery. The difference between this comparative example and Example 1 is that the raw material composition of the LATP coating in this comparative example is as follows: 3kg Ti(OC4H9)4, 4.5kg C2H6O, 2kg NH4H2PO4, 0.8kg Al(NO3)3·9H2O, and 0.5kg LiNO3·H2O.

[0093] Performance testing

[0094] The following performance tests were conducted on the pouch cells provided in Examples 1-15 and Comparative Examples 1-3.

[0095] Long-term performance testing: For the pouch batteries provided in Examples 1-15 and Comparative Examples 1-3, the discharge capacity of the cathode in the pouch battery was measured. After cycling the pouch battery 300 times at 45°C, the discharge capacity of the cathode in the pouch battery was measured again. The percentage of the discharge capacity measured twice was calculated, as shown in Table 1. This tests the energy storage capacity of the pouch battery after 300 cycles. The calculation results are shown in Table 1. The test results for Comparative Example 1, Example 1, Example 4, and Example 5 are as follows: Figure 1 As shown.

[0096] XRD analysis: The XRD spectra of the cathode materials in the pouch cells provided in Comparative Example 1, Example 1, Example 4, and Example 5 were analyzed, such as... Figure 2 As shown.

[0097] XRD Rietveld Refinement Detection: XRD Rietveld refinement was performed on the LATP-coated LNCMAO cathode material in the pouch cells provided in Comparative Example 1 and Example 1, respectively. The results are as follows: Figure 3 and Figure 4 .

[0098] Transmission electron microscopy (TEM) analysis: TEM images of the LATP-coated LNCMAO cathode material in the pouch cell provided in Example 1 were analyzed, such as... Figure 5 As shown.

[0099] Table 1

[0100] Group Electrical storage capacity / % Group Electrical storage capacity Example 1 90.9 Example 10 90.7 Example 2 85.4 Example 11 90.8 Example 3 88.6 Example 12 90.0 Example 4 85.2 Example 13 90.3 Example 5 87.5 Example 14 90.7 Example 6 90.1 Example 15 90.8 Example 7 90.3 Comparative Example 1 81.3 Example 8 90.8 Comparative Example 2 82.9 Example 9 90.8 Comparative Example 3 83.8

[0101] As can be seen from Example 1 and Comparative Examples 1-3, and Table 1, the pouch battery prepared in Example 1 has a higher energy storage capacity. This indicates that using the raw material ratio and process of Example 1 helps to prepare a pouch battery with good long-lasting performance.

[0102] As can be seen from Examples 1-15 and Table 1, the energy storage capacity of the pouch batteries prepared in Examples 1-15 is all above 85%, which is relatively high. This indicates that using the raw material ratios and process conditions within the range of Examples 1-15 is helpful in preparing pouch batteries with good long-lasting performance.

[0103] Combining Comparative Example 1, Example 1, Examples 4-5 and Figure 1 It can be seen that, compared with Comparative Example 1, the pouch batteries prepared in Examples 1 and 4-5 have higher energy storage capacity. Moreover, the pouch battery of Example 1 has a higher energy storage capacity than that of Examples 4-5. This indicates that controlling the weight percentage of LATP coating and LNCMAO cathode material within 1wt%-3wt% helps to improve the long-term performance of pouch batteries. Furthermore, controlling the weight percentage of LATP coating and LNCMAO cathode material at around 2wt% is even better.

[0104] Combining Comparative Example 1, Example 1, Examples 4-5 and Figure 2 It can be seen that all the sharp diffraction peaks with high crystallinity are hexagonal α-NaFeO2 layered structures with space group R-3m

[28] . In addition, in the XRD spectra of the cathode materials of Comparative Example 1, Example 1, and Examples 4-5, the obvious separation of adjacent (006) / (102) and (008) / (110) diffraction peaks indicates that the samples formed a highly ordered layered hexagonal structure, and the LATP covering process did not change the layered structure characteristics of the original samples. Compared with Comparative Example 1, Examples 1 and Examples 4-5 showed some weak diffraction peaks corresponding to the LATP phase, which became more obvious with the increase of LATP coverage. This may be due to the lattice Li + Ti with smaller ionic radius 4+ Partial substitution. Furthermore, the LATP coating amplified the c / a, I(003) / I(104), and (I(006)+I(102)) / I(101) values ​​of the sample, representing the layered structure, cation mixing degree, and hexagonal order of the cathode material, respectively. The comparative results indicate that the LATP coating helps the LNCMAO cathode material form a good layered structure and reduces Ni... 2+ and Li + The mixing of cations enhances the hexagonal ordered structure of the prepared sample.

[0105] Combining Comparative Example 1, Example 1 and Figure 3-4 It can be seen that, Figure 3 and Figure 4 Section refinement and Figure 2 The XRD data show good agreement. This indicates that the quality of the XRD Rietveld refinement meets the consistency between the observed and calculated profiles, confirming the presence of Li in the lattice.+ Part of Ti 4+ replace.

[0106] Combining Example 1 and Figure 5 As can be seen, in the soft-pack battery of Example 1, the LNCMAO cathode material has a LATP layer with a thickness of 10-20 nanometers on its surface, which is the key to improving the material performance.

[0107] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A stable pouch battery, characterized in that, This includes LATP-coated LNCMAO cathode materials, wherein the LATP-coated LNCMAO cathode material is an LNCMAO cathode material with an LATP coating on its surface, and the general formula of the LNCMAO cathode material is LiNi. 0.83 Co 0.06 Mn 0.06 Al 0.05 O2, the LATP coating is made of Li 1.3 Al 0.3 Ti 1.7 The material is (PO4)3, and the weight percentage of the LATP coating to the LNCMAO cathode material is 1wt%-3wt%, and the thickness of the LATP coating is 10-20nm.

2. The application-stable soft-pack battery according to claim 1, characterized in that, The LATP coating has a weight percentage of 1.8-2.2 wt% to the LNCMAO cathode material.

3. The application-stable soft-pack battery according to claim 1, characterized in that, The LNCMAO cathode material is made from the following raw materials in parts by weight: 40-98 parts LiNO3·H2O, 145-242 parts Ni(NO3)2·6H2O, 14-24 parts Co(NO3)2·6H2O, 12-22 parts Mn(NO3)2·4H2O, 11-23 parts Al(NO3)3·9H2O, 740-1365 parts purified water, 22-41 parts LiNO3, 10-30 parts citric acid, and 0-30 parts NH3·H2O.

4. The application-stable soft-pack battery according to claim 3, characterized in that, The Li 1.3 Al 0.3 Ti 1.7 (PO4)3 material is made from the following raw materials in parts by weight: 875-2625 parts Ti(OC4H9)4, 1500-4000 parts C2H6O, 525-1575 parts NH4H2PO4, 17-51 parts Al(NO3)3·9H2O, and 13-39 parts LiNO3·H2O.

5. A manufacturing process for a stable pouch cell according to any one of claims 1-4, characterized in that, Includes the following steps: According to the formula, LiNO3·H2O, Ni(NO3)2·6H2O, Co(NO3)2·6H2O, Mn(NO3)2·4H2O and Al(NO3)3·9H2O are dispersed in pure water to obtain a raw material aqueous solution. LiNO3 and citric acid are added to the raw material aqueous solution, and after stirring, NH3·H2O is added to obtain a whole solution. The excess solvent in the whole solution is evaporated to obtain a gel. The gel is rinsed and calcined to obtain LNCMAO powder. Ti(OC4H9)4 was dissolved in a portion of C2H6O to obtain a Ti(OC4H9)4 / C2H6O solution; NH4H2PO4, Al(NO3)3·9H2O, and LiNO3·H2O were dissolved in another portion of C2H6O to obtain a mixed solution; the mixed solution was added to the Ti(OC4H9)4 / C2H6O solution, and the mixture was stirred continuously while reducing C2H6O2 to obtain a suspension; LNCMAO powder was added to a suspension under vigorous stirring to obtain a mixed system. The mixed system was then placed in a water bath for 5 hours to form a sol. The sol was heated to obtain a compound. The compound was then ball-milled and heated to obtain LATP-coated LNCMAO cathode material. A pouch cell was fabricated by coating LNCMAO cathode material with LATP, resulting in a pouch cell with stable performance in applications.

6. The fabrication process of the application-stable soft-pack battery according to claim 5, characterized in that, When the overall solution pH is 9.0, excess solvent is evaporated under water bath conditions of 80-90℃ to obtain a gel.

7. The fabrication process of the application-stable soft-pack battery according to claim 5, characterized in that, The gel was washed and calcined at 105-115℃ for 9-12 hours, then calcined at 450-550℃ for 5-7 hours, and finally calcined at 800-900℃ under O2 conditions for 10-14 hours to obtain LNCMAO powder.

8. The fabrication process of the application-stable soft-pack battery according to claim 5, characterized in that, The sol was heated at 115-125℃ for 10-14h to obtain the compound. The compound was ball-milled and then heated at 480-520℃ in an Ar2 atmosphere for 3.5-4.5h, and then heated at 780-820℃ in an Ar2 atmosphere for 1.8-2.2h to obtain the LATP-coated LNCMAO cathode material.

9. The fabrication process of the application-stable pouch battery according to claim 5, characterized in that, Adjust the pH of the suspension to neutral.

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