Preparation method and application of inorganic oxide solid electrolyte nano dispersion liquid
By treating the dispersant and solvent separately, an inorganic oxide solid electrolyte nano-dispersion was prepared, which solved the problem of dispersion instability, enabled long-term stable storage, reduced transportation difficulty, and lowered equipment cleaning and costs.
Patent Information
- Application Number
- CN202410671725.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-11-28
AI Technical Summary
Existing inorganic oxide solid electrolyte nanodispersions are prone to large particle aggregation and precipitation and phase separation during storage, resulting in unstable dispersions that are difficult to store and transport for a long time, and also make equipment cleaning difficult.
Dispersant and partial solvent are mixed and then processed separately from inorganic oxide solid electrolyte to prepare dispersant solution and precursor slurry. This avoids the grinding media from damaging the dispersant. After uniform mixing, the solid content and viscosity are tested to ensure stability.
The prepared inorganic oxide solid electrolyte nano-dispersion can be stably stored at 25℃ for more than 30 days, with the solid content deviation at the upper, middle and lower positions not exceeding 2%, reducing precipitation, lowering the difficulty of equipment cleaning and transportation, and reducing costs.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of lithium battery technology, specifically relating to a method for preparing an inorganic oxide solid electrolyte nanodispersion. Background Technology
[0002] Existing inorganic oxide solid electrolyte nanodispersions are obtained by dispersing nano-sized inorganic oxide solid electrolytes in a solvent. However, over time, large particles of the inorganic oxide solid electrolytes agglomerate and precipitate at the bottom, leading to phase separation and the formation of two distinct parts. The solid content of the upper and lower parts of the dispersion differs significantly, making stable production impossible. Therefore, inorganic oxide solid electrolyte nanodispersions often face numerous problems in actual production, such as short storage periods and transportation difficulties. Furthermore, in practical production, both pipeline transportation and tank storage present significant challenges in equipment cleaning, potentially damaging the equipment. Therefore, finding a stable and storeable method for preparing inorganic oxide solid electrolyte nanodispersions is urgently needed. Summary of the Invention
[0003] The technical problem to be solved by the present invention is that, over time, large particles in existing inorganic oxide solid electrolyte nanodispersions will gradually agglomerate and precipitate at the bottom, resulting in phase separation. This application provides a method for preparing and applying an inorganic oxide solid electrolyte nanodispersion.
[0004] To address the aforementioned technical problems, in a first aspect, this application provides a method for preparing an inorganic oxide solid electrolyte nanodispersion, comprising the following steps:
[0005] To obtain inorganic oxide solid electrolytes and solvents;
[0006] The dispersant and a portion of the solvent are mixed evenly to obtain a dispersant solution;
[0007] An inorganic oxide solid electrolyte and another portion of the solvent are mixed evenly to obtain a precursor slurry.
[0008] The inorganic oxide solid electrolyte nanodispersion was prepared by uniformly mixing the dispersant solution and the precursor slurry.
[0009] Preferably, the dispersant comprises one or more of the following: organobentonite, castor oil derivatives, ethyl cellulose, fumed silica, polyolefin wax, modified hydrogenated castor oil, N-methylpyrrolidone solution of modified polyurea, titanate coupling agent, polyamide wax, and polyurethane thickener.
[0010] Preferably, in the solid electrolyte nanodispersion, the mass content of the dispersant is 0.2% to 2.0%.
[0011] Preferably, in the step of uniformly mixing the dispersant and a portion of the solvent to obtain a dispersant solution, the portion of the solvent accounts for X% of the total solvent by mass, which is 30% ≤ X% ≤ 80%.
[0012] Preferably, the solvent includes one or more of deionized water, alcohol solvents, and NMP.
[0013] Preferably, the process of uniformly mixing the dispersant solution and the precursor slurry includes the following steps:
[0014] The finished slurry is obtained by uniformly mixing the dispersant solution and the precursor slurry.
[0015] After the finished slurry was left to stand at 25°C for 3-5 days, 9-10 days, and 20 days respectively, the solid content and viscosity of the upper, middle, and lower parts of the liquid surface of the finished slurry were tested accordingly. The solid content deviation of the upper part was ≤5%, the solid content deviation of the middle part was ≤5%, and the solid content deviation of the lower part was ≤5%. The viscosity of the finished slurry was 600-4000 mPa·s.
[0016] Preferably, the solid content of the finished slurry is 20% to 60%.
[0017] Preferably, the inorganic oxide solid electrolyte includes at least one of the following: LISICON system, NASICON system, Perovskite type, and Garnet system;
[0018] The LISICON system includes compounds represented by Formula 1, Li a M x O4 formula 1,
[0019] Where M includes Al 3+ Ga 3+ Si 4+ 、Ge 4+ Ti 4+ P 5+ As 5+ V 5+ S 6+ Mo 6+ W 6+ One or more of them, and M is a combination of two or more cations with different valences;
[0020] The NASICON system includes the compound shown in Formula 2, A x M'2(BO4)3 Equation 2,
[0021] Where A is Na + Or Li + M' includes Cr 3+ Al 3+Ga 3+ ,Sc 3+ Y 3+ In 3+ La 3+ M 4+ Ti 4+ 、Ge 4+ Sn 4+ Hf 4+ Zr 4+ One or more of the following; B is P or Si;
[0022] Perovskite type includes compounds shown in Formula 3, E x FO3 type 3,
[0023] Wherein, E includes one or more of alkaline earth metals and rare elements, and F includes at least one of transition metal elements;
[0024] The Garnet system includes the compound shown in Formula 4, A'3B'2(SiO4)3 (Formula 4).
[0025] Wherein, A' includes one or more of Ca, Mg, Y, La or rare elements, and B' includes one or more of Al, Fe, Cr, Ti, Zr, and A' and B' are 8- or 6-coordinated cations respectively.
[0026] Preferably, in the step of obtaining the inorganic oxide solid electrolyte, the inorganic oxide solid electrolyte is in powder form, and the D50 particle size of the inorganic oxide solid electrolyte is 200-800 nm.
[0027] Secondly, this application provides an application of the inorganic oxide solid electrolyte nanodispersion prepared by the above-described method in lithium batteries.
[0028] This application provides a method for preparing an inorganic oxide solid electrolyte nanodispersion. First, a dispersant and a portion of a solvent are mixed to obtain a dispersant solution. Then, another portion of the solvent is mixed with the inorganic oxide solid electrolyte to obtain a precursor slurry. Preparing the dispersant and inorganic oxide solid electrolyte separately avoids damage to the dispersant caused by grinding media or prolonged stirring. This also reduces the amount of dispersant used and lowers formulation costs. The prepared inorganic oxide solid electrolyte nanodispersion is relatively stable and can be stored stably for more than 30 days. The solid content deviation at the top, middle, and bottom positions of the nanodispersion does not exceed 2%, reducing sedimentation, minimizing waste of formulation costs and labor caused by cleaning equipment, and avoiding quality fluctuations in subsequent products due to instability of the finished slurry. This stabilizes production and reduces storage and transportation difficulties. Detailed Implementation
[0029] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0030] On one hand, one embodiment of this application provides a method for preparing an inorganic oxide solid electrolyte nanodispersion, comprising the following steps:
[0031] To obtain inorganic oxide solid electrolytes and solvents;
[0032] The dispersant and a portion of the solvent are mixed evenly to obtain a dispersant solution;
[0033] An inorganic oxide solid electrolyte and another portion of the solvent are mixed evenly to obtain a precursor slurry.
[0034] The inorganic oxide solid electrolyte nanodispersion was prepared by uniformly mixing the dispersant solution and the precursor slurry.
[0035] This application provides a method for preparing an inorganic oxide solid electrolyte nanodispersion. First, a dispersant and a portion of a solvent are mixed to obtain a dispersant solution. Then, another portion of the solvent is mixed with the inorganic oxide solid electrolyte to obtain a precursor slurry. Preparing the dispersant and inorganic oxide solid electrolyte separately avoids damage to the dispersant caused by grinding media or prolonged stirring. This also reduces the amount of dispersant used and lowers formulation costs. The prepared inorganic oxide solid electrolyte nanodispersion is relatively stable and can be stored stably for more than 30 days. The solid content deviation at the top, middle, and bottom positions of the nanodispersion does not exceed 2%, reducing sedimentation, minimizing waste of formulation costs and labor caused by cleaning equipment, and avoiding quality fluctuations in subsequent products due to instability of the finished slurry. This stabilizes production and reduces storage and transportation difficulties.
[0036] In some embodiments, the dispersant includes one or more of organobentonite, castor oil derivatives, ethyl cellulose, fumed silica, polyolefin wax, modified hydrogenated castor oil, N-methylpyrrolidone solution of modified polyurea, titanate coupling agent, polyamide wax, and polyurethane thickener.
[0037] Specifically, the dispersant can be one, two, or more of the compounds mentioned above.
[0038] The dispersant mainly plays a dispersing role, preventing the sedimentation of inorganic oxide solid electrolytes in the prepared nano-dispersion.
[0039] In some embodiments, the mass content of the dispersant in the solid electrolyte nanodispersion is 0.2% to 2.0%.
[0040] Specifically, the mass content of the dispersant can be 0.2%, 0.3%, 0.4%, 0.5%, 0.8%, 1.0%, 1.2%, 1.5%, 1.7%, 1.9%, 2.0%, etc., as long as the mass content of the dispersant is within the range of 0.2% to 2.0%.
[0041] In some embodiments, in the step of uniformly mixing the dispersant and a portion of the solvent to obtain a dispersant solution, the portion of the solvent accounts for X% of the total solvent by mass, which is 30% ≤ X% ≤ 80%.
[0042] Specifically, a portion of the solvent and dispersant are first mixed. The mixing method here should not involve grinding, to avoid the grinding media damaging the dispersant during the grinding process, affecting the dispersion effect of the dispersant, and causing the inorganic oxide solid electrolyte nano-dispersion to settle.
[0043] In the step of uniformly mixing the dispersant and a portion of the solvent to obtain a dispersant solution, the uniform mixing method includes one of magnetic stirring, dispersing disc stirring, or ultrasonic dispersion.
[0044] First, a portion of the solvent and dispersant are mixed. This portion of the solvent can be X% of the total solvent mass, where X ranges from 30% to 80%, meaning the portion of the solvent accounts for 30% to 80% of the total solvent mass. Values for X can be 30, 34, 39, 40, 42, 45, 48, 50, 53, 55, 57, 60, 63, 65, 68, 70, 73, 76, 80, etc.
[0045] In some embodiments, the solvent includes one or more of deionized water, alcohol solvents, and NMP.
[0046] Specifically, alcohol solvents include ethanol.
[0047] The choice of solvent can be adjusted according to the intended use of the prepared inorganic oxide solid electrolyte nanodispersion.
[0048] In some embodiments, mixing the dispersant solution and the precursor slurry uniformly includes the following steps:
[0049] The finished slurry is obtained by uniformly mixing the dispersant solution and the precursor slurry.
[0050] After the finished slurry was left to stand at 25°C for 3-5 days, 9-10 days, and 30 days respectively, the solid content and viscosity of the upper, middle, and lower parts of the liquid surface of the finished slurry were tested accordingly. The solid content deviation of the upper part was ≤2%, the solid content deviation of the middle part was ≤2%, and the solid content deviation of the lower part was ≤2%. The viscosity of the finished slurry was 600-4000 mPa·s.
[0051] Specifically, after the finished slurry is left to stand at a constant temperature of 25°C for 3 to 5 days, slurry 1 is obtained. The solid content and viscosity of slurry 1 are tested at the upper, middle, and lower parts of the liquid surface. Slurry 1 is then left to stand at a constant temperature of 25°C for 9 to 10 days to obtain slurry 2. The solid content and viscosity of slurry 2 are then tested at the upper, middle, and lower parts of the liquid surface. Slurry 2 is then left to stand at a constant temperature of 25°C for 30 days to obtain slurry 3. The solid content and viscosity of slurry 3 are then tested at the upper, middle, and lower parts of the liquid surface.
[0052] The solid content deviation of the slurry at the upper part of the finished slurry surface after standing at 25℃ for 3-5 days, 9-10 days, and 30 days is ≤2%; the solid content deviation of the slurry at the middle part of the finished slurry surface after standing at 25℃ for 3-5 days, 9-10 days, and 30 days is ≤2%; and the solid content deviation of the slurry at the lower part of the finished slurry surface after standing at 25℃ for 3-5 days, 9-10 days, and 30 days is ≤2%.
[0053] In some embodiments, the solid content of the finished slurry is 20% to 60%.
[0054] Specifically, the solid content of the finished slurry is in the range of 20% to 60%, which helps to improve the stability of the inorganic oxide solid electrolyte nano-dispersion and reduce sedimentation. If the solid content of the finished slurry is too low, the slurry viscosity is low, and the slurry is prone to sedimentation; if the solid content of the finished slurry is too high, the slurry viscosity is too high, which affects the coating of the inorganic oxide solid electrolyte nano-dispersion.
[0055] Specifically, the solid content of the finished slurry can be in the following ranges: 20%–30%, 30%–40%, 40%–50%, or 50%–60%.
[0056] The inorganic oxide solid electrolyte includes at least one of the following: LISICON system, NASICON system, Perovskite type, and Garnet system.
[0057] The LISICON system includes compounds represented by Formula 1, Li a M x O4 formula 1,
[0058] Where M includes Al 3+ Ga 3+ Si 4+ 、Ge 4+ Ti 4+ P 5+ As 5+ V 5+ S 6+ Mo6+ W 6+ One or more of them, and M is a combination of two or more cations with different valences;
[0059] The NASICON system includes the compound shown in Formula 2, A x M'2(BO4)3 Equation 2,
[0060] Where A is Na + Or Li + M' includes Cr 3+ Al 3+ Ga 3+ ,Sc 3+ Y 3+ In 3+ La 3+ M 4+ Ti 4+ 、Ge 4+ Sn 4+ Hf 4+ Zr 4+ One or more of the following; B is P or Si;
[0061] Perovskite type includes compounds shown in Formula 3, E x FO3 type 3,
[0062] Wherein, E includes one or more alkaline earth metals, and F includes at least one transition metal element;
[0063] The Garnet system includes the compound shown in Formula 4, A'3B'2(SiO4)3 (Formula 4).
[0064] Wherein, A' includes one or more of Ca, Mg, Y, La or rare elements, and B' includes one or more of Al, Fe, Cr, Ti, Zr, and A' and B' are 8- or 6-coordinated cations respectively.
[0065] In some embodiments, in the step of obtaining inorganic oxide solid electrolyte, the inorganic oxide solid electrolyte is in powder form, and the D50 particle size of the inorganic oxide solid electrolyte is 200-800 nm.
[0066] Specifically, the inorganic oxide solid electrolyte is in powder form with a D50 particle size ranging from 200 to 800 nm, resulting in a larger specific surface area. This facilitates the uniform dispersion of the inorganic oxide solid electrolyte in the solvent under the action of a dispersant. Specifically, the D50 particle size of the inorganic oxide solid electrolyte can be in the following ranges: 200 nm–300 nm, 300 nm–350 nm, 350 nm–400 nm, 400 nm–500 nm, 500 nm–620 nm, 620 nm–700 nm, or 700 nm–800 nm.
[0067] In some embodiments, in the step of uniformly mixing an inorganic oxide solid electrolyte and another portion of a solvent to obtain a precursor slurry, the mixing method in uniformly mixing includes at least one of magnetic stirring, dispersion disc dispersion, ultrasonic dispersion, ball mill dispersion, and sand mill dispersion.
[0068] In some embodiments, the inorganic oxide solid electrolyte nanodispersion is prepared by uniformly mixing the dispersant solution and the precursor slurry, wherein the mixing method for uniformly mixing the dispersant solution and the precursor slurry includes at least one of magnetic stirring, dispersing disk stirring, and ultrasonic dispersion.
[0069] It should be noted that the mixing method in the step of uniformly mixing the dispersant solution and the precursor slurry should not involve grinding, to avoid damaging the dispersant during the grinding process and affecting the dispersion effect.
[0070] Secondly, this application provides an application of the inorganic oxide solid electrolyte nanodispersion prepared by the above-described method in lithium batteries.
[0071] Specifically, lithium batteries include lithium solid-state batteries and lithium-ion batteries.
[0072] Specifically, the preparation method of the inorganic oxide solid electrolyte nanodispersion disclosed in this invention includes the following steps:
[0073] Example 1
[0074] 1) Obtain LATP powder with a D50 particle size of 600 nm, using pure water as the solvent and ethyl cellulose as the dispersant.
[0075] 2) Mix the dispersant and a portion of the solvent evenly to obtain a dispersant solution, wherein X% is 50%, and the specific steps are as follows.
[0076] Weigh 1g of ethyl cellulose additive and 30g of pure water, add them to a beaker, place a medium-sized magnetic stir bar inside, and then place the beaker on a magnetic stirrer. Stir and disperse the mixture at 500r / min for 60min to obtain a dispersion solution.
[0077] 3) Mix the inorganic oxide solid electrolyte and another part of the solvent evenly to obtain the precursor slurry. The specific steps are as follows.
[0078] Weigh 40g of LATP powder, 30g of pure water, and 60g of zirconium beads from step 1) and add them to the ball mill jar. Cover the jar, place it in the ball mill, secure it, and start ball milling. After ball milling, separate the zirconium beads by passing them through a 120-mesh sieve and collect the precursor slurry.
[0079] 4) The precursor slurry 70g in step 3) and the dispersant solution in step 2) are mixed evenly to obtain a finished slurry with a solid content of 40%, namely an inorganic oxide solid electrolyte nano-dispersion. The solid content at the upper, middle and lower positions of the initial finished slurry surface is tested, and the viscosity of the finished slurry is tested. The test results are shown in Table 1.
[0080] 5) After the finished slurry from step 4) was left to stand at a constant temperature of 25°C for 5 days, slurry 1 was obtained. The solid content at the upper, middle and lower parts of the liquid surface of slurry 1 was tested, and the viscosity of slurry 1 was tested.
[0081] After slurry 1 was left to stand at a constant temperature of 25℃ for 10 days, slurry 2 was obtained. The solid content and viscosity of slurry 2 were measured at the upper, middle, and lower parts of the liquid surface. After slurry 2 was left to stand at a constant temperature of 25℃ for 30 days, slurry 3 was obtained. The solid content and viscosity of slurry 3 were measured at the upper, middle, and lower parts of the liquid surface. The test results are shown in Table 1.
[0082] Example 2
[0083] This embodiment is the same as embodiment 1 in most steps, except that in step 2), 0.5g of ethyl cellulose additive is added, and the rest is the same as in embodiment 1.
[0084] Example 3
[0085] This embodiment is the same as embodiment 1 in most steps, except that in step 3), 40g of LATP powder and 60g of pure water are weighed out from step 1), and the rest is the same as in embodiment 1.
[0086] Example 4
[0087] This embodiment is the same as embodiment 2 in most steps, except that in step 3), 40g of LATP powder and 60g of pure water from step 1) are weighed out, and the rest is the same as in embodiment 1.
[0088] Example 5
[0089] This embodiment is similar to Embodiment 1 in most steps, except that the dispersants used are castor oil derivatives and organobentonite.
[0090] Example 6
[0091] This embodiment is similar to Embodiment 1 in most steps, except that the dispersant used is a modified hydrogenated castor oil and modified polyurea N-methylpyrrolidone solution.
[0092] Example 7
[0093] This embodiment is the same as embodiment 1 in most steps, except that in step 2), 0.1g of ethyl cellulose is used, and the rest is the same as in embodiment 1.
[0094] Example 8
[0095] This embodiment is the same as embodiment 1 in most steps, except that in step 2), 3g of ethyl cellulose additive is added, and the rest is the same as in embodiment 1.
[0096] Comparative Example 1
[0097] 1) Obtain LATP powder with a D50 particle size of 600 nm using pure water as the solvent.
[0098] 2) Weigh 60g of zirconium beads and add them to the ball mill jar. Then add 40g of LATP powder and 60g of pure water from step 1). Cover the jar and place it in the ball mill. Secure the jar and ball mill the mixture until it is homogeneous. Test the solid content at the top, middle and bottom of the slurry and test the viscosity of the slurry. The test results are shown in Table 1.
[0099] 3) The solid content and viscosity of the finished slurry were measured at the upper, middle and lower parts of the liquid surface after standing at a constant temperature of 25℃ for 5 days, 10 days and 30 days, respectively. The test method was the same as in Example 1.
[0100] Comparative Example 2
[0101] 1) Obtain LATP powder with a D50 particle size of 600 nm, using pure water as the solvent and ethyl cellulose as the dispersant.
[0102] 2) Weigh 60g of zirconium beads and add them to the ball mill jar. Then add 40g of LATP powder, 60g of pure water and 0.3g of ethyl cellulose from step 1). Cover the jar and place it in the ball mill. Secure the jar and ball mill. Mix the jar evenly to obtain the finished slurry. Test the solid content at the top, middle and bottom of the slurry and test the viscosity of the finished slurry. The test results are shown in Table 1.
[0103] 3) The solid content and viscosity of the finished slurry were measured at the upper, middle and lower parts of the liquid surface after standing at a constant temperature of 25℃ for 5 days, 10 days and 30 days, respectively. The test method was the same as in Example 1.
[0104] Table 1
[0105]
[0106]
[0107] As shown in Table 1, compared with Comparative Examples 1-2, Comparative Example 1, which did not add a dispersant, showed a significant difference in solid content at the top, middle, and bottom positions of the slurry after 5 days of standing, with a difference of about 20%. In Comparative Example 2, although a dispersant was added, the dispersant, solvent, and solid electrolyte were mixed together and ball-milled to obtain the finished slurry. It is speculated that the dispersant was destroyed by ball milling, and after 5 days of storage, the solid content deviation at the top and bottom positions of the nano-dispersion was about 15%. It is speculated that the preparation method provided in this application, which first mixes the dispersant and part of the solvent to obtain a dispersant solution, and then mixes the other part of the solvent and inorganic oxide solid electrolyte to obtain a precursor slurry, avoids the destruction of the dispersant by grinding media or excessive stirring time, and can also reduce the use of dispersant to a certain extent, thus reducing the formulation cost. The prepared inorganic oxide solid electrolyte nano-dispersion is relatively stable and can be stored stably for more than 30 days, with the solid content deviation at the top and bottom positions of the nano-dispersion not exceeding 2%.
[0108] Comparing Examples 1-4, 8 and Example 7, the mass content of the dispersant added in Example 7 was less than 0.2%. After the prepared nano-dispersion was stored for 30 days, the solid content deviation of the upper, middle and lower positions of the dispersion was too large. This indicates that the mass content of the dispersant in the range of 0.2% to 2% can be stably stored for more than 30 days, and the solid content deviation of the upper, middle and lower positions of the nano-dispersion does not exceed 2%.
[0109] Comparing Examples 1 and 3, and Examples 2 and 4, in the step of preparing the dispersant solution, the added solvent accounts for 30% to 80% of the total solvent by mass. The resulting dispersion has good stability and can be stored stably for more than 30 days. The solid content deviation of the upper, middle, and lower positions of the nano-dispersion does not exceed 2%. Comparing Examples 1 with Examples 5 and 6, changing the type of dispersant, as long as the dispersant is within the scope of this application, all have the same effect. The resulting dispersion can be stored stably for more than 30 days, and the solid content deviation of the upper, middle, and lower positions of the nano-dispersion does not exceed 2%.
[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for preparing an inorganic oxide solid electrolyte nanodispersion, characterized in that, Includes the following steps: To obtain inorganic oxide solid electrolytes and solvents; The dispersant and a portion of the solvent are mixed evenly to obtain a dispersant solution; An inorganic oxide solid electrolyte and another portion of the solvent are mixed evenly to obtain a precursor slurry. The inorganic oxide solid electrolyte nanodispersion was prepared by uniformly mixing the dispersant solution and the precursor slurry.
2. The method for preparing the inorganic oxide solid electrolyte nanodispersion according to claim 1, characterized in that, The dispersant includes one or more of the following: organobentonite, castor oil derivatives, ethyl cellulose, fumed silica, polyolefin wax, modified hydrogenated castor oil, N-methylpyrrolidone solution of modified polyurea, titanate coupling agent, polyamide wax, and polyurethane thickener.
3. The method for preparing the inorganic oxide solid electrolyte nanodispersion according to claim 1, characterized in that, In the solid electrolyte nanodispersion, the mass content of the dispersant is 0.2% to 2.0%.
4. The method for preparing the inorganic oxide solid electrolyte nanodispersion according to claim 1, characterized in that, In the step of uniformly mixing the dispersant and a portion of the solvent to obtain a dispersant solution, the portion of the solvent accounts for X% of the total solvent mass, which is 30% ≤ X% ≤ 80%.
5. The method for preparing the inorganic oxide solid electrolyte nanodispersion according to claim 1, characterized in that, The solvent includes one or more of deionized water, alcohol solvents, and NMP.
6. The method for preparing the inorganic oxide solid electrolyte nanodispersion according to claim 1, characterized in that, The process of uniformly mixing the dispersant solution and the precursor slurry includes the following steps: The finished slurry is obtained by uniformly mixing the dispersant solution and the precursor slurry. After the finished slurry was left to stand at 25°C for 3-5 days, 9-10 days, and 20 days respectively, the solid content and viscosity of the upper, middle, and lower parts of the liquid surface of the finished slurry were tested accordingly. The solid content deviation of the upper part was ≤5%, the solid content deviation of the middle part was ≤5%, and the solid content deviation of the lower part was ≤5%. The viscosity of the finished slurry was 600-4000 mPa·s.
7. The method for preparing the inorganic oxide solid electrolyte nanodispersion according to claim 6, characterized in that, The solid content of the finished slurry is 20% to 60%.
8. The method for preparing the inorganic oxide solid electrolyte nanodispersion according to claim 1, characterized in that, The inorganic oxide solid electrolyte includes at least one of the following: LISICON system, NASICON system, Perovskite type, and Garnet system. The LISICON system includes compounds represented by Formula 1, Li a M x O4 formula 1, Where M includes Al 3+ Ga 3+ Si 4+ 、Ge 4+ Ti 4+ P 5+ As 5+ V 5+ S 6+ Mo 6+ W 6+ One or more of them, and M is a combination of two or more cations with different valences; The NASICON system includes the compound shown in Formula 2, A x M'2(BO4)3 Equation 2, Where A is Na + Or Li + M' includes Cr 3+ Al 3+ Ga 3+ ,Sc 3+ Y 3+ In 3+ La 3+ M 4+ Ti 4+ 、Ge 4+ Sn 4+ Hf 4+ Zr 4+ One or more of the following; B is P or Si; Perovskite type includes compounds shown in Formula 3, E x FO3 type 3, Wherein, E includes one or more alkaline earth metals, and F includes at least one transition metal element; The Garnet system includes the compound shown in Formula 4, A'3B'2(SiO4)3 (Formula 4). Wherein, A' includes one or more of Ca, Mg, Y, La or rare elements, and B' includes one or more of Al, Fe, Cr, Ti, Zr, and A' and B' are 8- or 6-coordinated cations respectively.
9. The method for preparing the inorganic oxide solid electrolyte nanodispersion according to claim 1, characterized in that, In the step of obtaining inorganic oxide solid electrolyte, the inorganic oxide solid electrolyte is in powder form, and the D50 particle size of the inorganic oxide solid electrolyte is 200-800 nm.
10. The application of the inorganic oxide solid electrolyte nanodispersion prepared by the method of any one of claims 1-9 in lithium batteries.