High-efficiency solid-state or solid-state-like battery structure

Abstract

A high-efficiency solid-state or solid-state-like battery structure includes: a negative electrode comprising: a negative electrode slurry; multiple SiC particles with tin layers distributed within the negative electrode slurry; and multiple coarse LATP particles mixed within the negative electrode slurry for guiding lithium ions; wherein multiple fine LATP particles are attached to the outer surface of the tin layer of each SiC particle with a tin layer; because the capacity of fine LATP particles to accommodate and equalize lithium ions is much higher than that of SiC particles with tin layers, and they do not produce a negative reaction with lithium ions; the overall capacity of the SiC particles with tin layers containing fine LATP particles to accommodate and equalize lithium ions is much higher than that of SiC particles with tin layers alone. A positive electrode comprising: a positive electrode slurry; and multiple coarse LLZO, LATP, and LiNO particles mixed within the positive electrode slurry for guiding lithium ions, thus resulting in a uniform channel distribution of lithium ions within the positive electrode. Multiple positive electrode particles are distributed within the positive electrode slurry, with each positive electrode particle having multiple fine particles of LLZO, LATP, and LiNO attached to its surface, which can conduct lithium ions with greater capacity and increase lithium ion flow. The battery structure also includes a dielectric film located between the negative electrode and the positive electrode, connected to the negative electrode on one side and the positive electrode on the other side.

Description

Technical Field

[0001] The present invention relates to solid-state and quasi-solid-state batteries, and in particular to a high-performance solid-state or quasi-solid-state battery structure. Prior Art Conventional solid-state or quasi-solid-state battery structures consist of a negative electrode 10', a positive electrode 20', and a dielectric film 30' positioned between the positive electrode 20' and the negative electrode 10', as shown in Figure 2. The negative electrode 10' is filled with a negative electrode slurry 12', which serves as a binder. The negative electrode 10' also includes a plurality of silicon carbide particles 15' (SiC particles with a tin layer) distributed within the negative electrode slurry 12'. The outer surfaces of the SiC particles with a tin layer accommodate and distribute lithium ions. However, the SiC particles with a tin layer react negatively with some lithium ions, reducing the number of available lithium ions and, over time, reducing the overall battery's capacitance. The positive electrode 20' is filled with a positive electrode slurry 22', which serves as a binder. The positive electrode 20' also includes a plurality of positive electrode particles 26' distributed within the positive electrode slurry 22'. The chemical molecules and positive electrode particles 26' in the positive electrode slurry 22' react negatively with lithium ions, thereby consuming available lithium ions. Furthermore, the dielectric film 30' of the solid-state battery is located between the negative electrode 10' and the positive electrode 20', serving to separate and connect the negative electrode 10' and the positive electrode 20'. In traditional solid-state or quasi-solid-state electrolytes, the positive and negative electrode slurries serve as guides for lithium ions. However, conventional positive and negative electrode slurries are prone to negative reactions with the lithium ions remaining within them, resulting in dead lithium or lithium depletion. This is an irreversible chemical reaction that causes the number of lithium ions in the battery to decrease, reducing the battery's storage capacity. Furthermore, the lithium storage capacity of the multiple positive and negative electrode particles in the positive and negative electrode slurries is poor. Therefore, the lithium ions in the positive and negative electrode slurries tend to accumulate on the surfaces of the positive and negative electrode particles. At this time, these lithium ions will produce negative reactions with the molecules in the positive and negative electrode slurries. Over long-term use, the capacitance of the entire positive and negative electrodes will be reduced. The negative reaction also leads to a decrease in the number of lithium ions, thereby reducing the battery's storage capacity. Therefore, this case hopes to propose a new solid-state or quasi-solid-state battery structure to solve the above-mentioned shortcomings of the previous technology. Summary of the Invention The present invention aims to address the aforementioned problems in conventional technology. It proposes a high-performance solid-state or quasi-solid-state battery structure, in which coarse LATP particles are added to the negative electrode slurry to guide lithium ions. This is primarily because LATP has a higher ionic conductivity for lithium ions than a mixed slurry of SBR and CMC. This allows for a uniform distribution of lithium ions within the negative electrode, preventing abnormal accumulation of lithium ions within the negative electrode slurry and negative reactions with the mixed slurry of SBR, CMC, etc. Furthermore, a plurality of fine LATP particles are attached to the surfaces of multiple silicon carbide particles (SiC particles with a tin layer). Because these LATP particles have a much higher capacity for accommodating and distributing lithium ions than SiC particles with a tin layer, and do not react negatively with lithium ions, the effective capacity of the entire negative electrode is increased during use, while reducing the loss of lithium ions due to negative reactions. Consequently, this solution can increase the battery's overall storage capacity while extending its service life. The positive electrode also incorporates multiple coarse LLZO particles, multiple coarse LATP particles, and multiple coarse LiNO particles to guide lithium ions. Furthermore, multiple fine LLZO particles, multiple fine LATP particles, and multiple fine LiNO particles are attached to the surface of these positive electrode particles. This positive electrode design allows for a better pathway for lithium ions, significantly increasing overall battery performance. To achieve the above-mentioned objectives, the present invention proposes a high-performance solid-state or quasi-solid-state battery structure, comprising: a negative electrode, the negative electrode comprising: a negative electrode substrate, which is a carrier material for supporting the negative electrode; a negative electrode slurry layer coated on the negative electrode substrate, comprising: a negative electrode slurry; a plurality of tin-coated silicon carbide particles, i.e., tin-coated SiC particles, distributed in the negative electrode slurry, the outer surface of the tin-coated SiC particles being coated with a tin layer; wherein the thickness of the tin layer is between 1 and 20 mm; a plurality of LATP coarse particles, mixed in the negative electrode slurry, for guiding lithium ions; thereby, the lithium ions are uniformly distributed in channels within the negative electrode, resulting in less negative reaction; wherein a plurality of LATP fine particles are attached to the outer surface of the tin layer of each of the tin-coated SiC particles; because the LATP fine particles have a much higher capacity for accommodating and evenly distributing lithium ions than the tin-coated SiC particles, and do not produce negative reactions with lithium ions, and can increase the effective capacity of the entire negative electrode during use; a positive electrode ; and a dielectric film is located between the negative electrode and the positive electrode, with one side connected to the negative electrode and the other side connected to the positive electrode, wherein the negative electrode slurry layer contacts the dielectric film; wherein the positive electrode comprises: a positive electrode substrate, which is a carrier material for supporting the positive electrode; a positive electrode slurry layer is coated on the positive electrode substrate, wherein the positive electrode slurry layer contacts the dielectric film, and the positive electrode slurry layer comprises: positive electrode slurry; a plurality of LLZO coarse particles, a plurality of LATP coarse particles, and a plurality of LiNO coarse particles, which are mixed in the positive electrode slurry for guiding lithium ions, so that the lithium ions present a uniform channel distribution inside the positive electrode, avoiding abnormal accumulation of lithium ions in the positive electrode slurry and negative reaction with the positive electrode slurry; and a plurality of positive electrode particles, which are distributed in the positive electrode slurry, wherein a plurality of LLZO fine particles, a plurality of LATP fine particles and a plurality of LiNO fine particles are attached to the surface of each of the positive electrode particles, and the LLZO fine particles have strong lithium ion guiding ability. The proportion of the fine particles accounts for 2 to 5 wt% of all the positive electrode particles; and the proportion of the coarse particles accounts for 2 to 5 wt% of the total positive electrode slurry; the total weight of the positive electrode particles accounts for 90-97 wt% of the positive electrode slurry layer. The features and advantages of the present invention can be further understood from the following description, which should be read with reference to the accompanying drawings. Simple diagram description FIG1 shows an embodiment of the present invention. FIG2 shows a structure diagram of a conventional solid or quasi-solid electrolyte. FIG3 shows the structure of SiC particles in this case. FIG4 shows the structure of the positive electrode particles in this case. Implementation Method The structural composition of this case, as well as the effects and advantages it can produce, are described in detail below with reference to the drawings and a preferred embodiment of this case. Please refer to Figures 1 to 4, which show the high-performance solid-state or quasi-solid-state battery structure of the present invention, including the following elements: A negative electrode 10 comprising: A negative electrode substrate 11, a carrier for carrying the negative electrode material 10; A negative electrode slurry layer 13 is coated on the negative electrode substrate 11. The negative electrode slurry layer 13 includes a negative electrode slurry 12 as a binder. The negative electrode slurry 12 is a mixture of SBR (Styrene Butadiene Rubber), CMC (Carboxymethyl Cellulose), and a conductive agent (CNT (Carbon Nanotube) or Super-P (conductive carbon). The solvent used in the preparation of the negative electrode slurry 12 is water. The negative electrode slurry layer 13 further comprises: Multiple LATP (NASICON structure, (Li1+xAlxTi2-x(PO4)3)) coarse particles 14, with particle sizes ranging from 1 to 3 microns, are mixed within the negative electrode slurry 12 to guide lithium ions. This is primarily because LATP material has a higher ionic conductivity for lithium ions than mixed slurries such as SBR and CMC. Therefore, when lithium ions pass through the negative electrode 10, the dispersed LATP coarse particles 14 guide the lithium ions, thus dispersing their pathways. This allows the lithium ions to be evenly distributed within the negative electrode 10, resulting in fewer negative reactions that would reduce the amount of lithium ions available for circulation within the battery and lead to battery failure. A small amount of LiPAA (lithium polyacrylate) and NaPAA (sodium polyacrylate) are also added to the negative electrode slurry 12. A plurality of silicon carbide particles 15 (tin-coated SiC particles 15) coated with a tin (Sn) layer 17 (as shown in FIG3) are distributed within the negative electrode slurry 12. These tin-coated SiC particles 15 are sized at 15 microns ± 20%. The tin layer 17 coats the outer surface of each tin-coated SiC particle 15. A plurality of LATP fine particles 16 are attached to the outer surface of the tin layer 17 of each tin-coated SiC particle 15. Each LATP fine particle 16 is smaller than 200 nanometers in size. The outer surface of the tin-coated SiC particles 15 accommodates and distributes lithium ions, forming a solid electrolyte interphase (SEI) film. This causes chemical molecules within the negative electrode slurry 12 to react negatively with some lithium ions, reducing the number of usable lithium ions. The thickness of the tin layer ranges from 1 to 20 mm. In this embodiment, the outer surface of the tin-coated SiC particles 15 is attached with multiple LATP fine particles 16. Because LATP fine particles have a much higher capacity for accommodating and distributing lithium ions than tin-coated SiC particles, and are less susceptible to negative reactions with lithium ions, the overall capacity of the tin-coated SiC particles 15 with the LATP fine particles 16 is much higher than that of the tin-coated SiC particles 15 alone. Therefore, this design allows the negative electrode 10 to accommodate and distribute more lithium ions. This increases the effective capacity of the negative electrode 10 during use and reduces lithium ion loss due to negative reactions, which would otherwise reduce the overall battery's capacitance. Furthermore, when lithium ions enter the negative electrode 10, the tin-coated SiC particles 15 with the LATP fine particles 16 provide a buffering effect. This overall design increases the battery's overall storage capacity and extends its service life. When a large number of lithium ions enter the negative electrode 10, the tin-coated SiC particles 15 with the LATP fine particles 16 can accommodate and evenly distribute the large amount of lithium ions. The multiple LATP coarse particles 14 mixed in the negative electrode slurry 12 buffer and accommodate the lithium ions, accelerating their flow rate and directing their direction before slowly expelling them. Therefore, the entire negative electrode 10 acts as a buffer for lithium ions, passivating the negative reactions within the negative electrode 10 and thereby increasing the overall battery life. In this case, the coarse LATP particles 14, the fine LATP particles 16, and the SiC particles with tin layers 15 all have a crystalline structure. Therefore, after the LATP fine particles 16 are compositely coated with the SiC particles with tin layers 15, the LATP's crystalline structure protects the SiC within, ensuring overall stability and preventing it from easily releasing or dissociating. This broadens the effective operating voltage range of the entire battery. In this embodiment, the preferred proportion of the LATP fine particles 16 in the negative electrode slurry 12 is 0.3 to 0.8 wt %, and the proportion of the LATP coarse particles 14 in the negative electrode slurry 12 is 0.3 to 0.8 wt %. The proportion of the LATP fine particles 16 in each tin-coated SiC particle 15 is 0.3 to 0.8 wt %, and the proportion of the tin-coated SiC particles 15 in the negative electrode slurry 12 is 88-96%. A positive electrode 20 comprising: A positive electrode substrate 21, a carrier for carrying the material of the positive electrode 20; A positive electrode slurry layer 23 is coated on the positive electrode substrate 21. The positive electrode slurry layer 23 comprises a positive electrode slurry 22 containing a binder, wherein the binder is a mixture of PVDF (polyvinylidene fluoride) and PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene). The solvent used in the preparation of the positive electrode slurry 22 is NMP (methylpyrrolidone). The positive electrode slurry 22 comprises PVDF, PVDF-HFP, a conductive agent (CNT, superP, KS8), LNO (lithium nickel-rich oxide, Li2NiO2), and LFO (lithium ferrite-rich oxide, Li5FeO4), with the amount of LNO and LFO both less than 0.2 wt%. The positive electrode slurry layer 23 further comprises: A plurality of LLZO (lithium lanthanum zirconium oxide) coarse particles 24 , with a particle size ranging from 0.05 to 0.1 μm, are mixed in the positive electrode slurry 22 to guide lithium ions. A plurality of LATP coarse particles 27, with a particle size ranging from 0.5 to 3 microns, are mixed in the positive electrode slurry 22 to guide lithium ions. A plurality of LiNO (lithium nickel oxide) coarse particles 29 , with a particle size ranging from 0.2 to 1 μm, are mixed in the positive electrode slurry 22 to guide lithium ions. The weight ratio of the LLZO coarse particles: the LATP coarse particles: the LiNO coarse particles is between 3:2:0.5 and 4:1:0.1, which means 3 to 4 (between 3 and 4): 2 to 1 (between 2 and 1): 0.5 to 0.1 (between 0.5 and 0.1). This is primarily because the ionic conductivity of LLZO, LATP, and LiNO materials for lithium ions is higher than that of the PVDF mixed slurry. Therefore, when lithium ions pass through the positive electrode 20, they are guided by the dispersed LLZO coarse particles 24, which disperse the lithium ion pathways. This allows the lithium ions to form a uniform channel distribution within the positive electrode 20, preventing abnormal lithium ion accumulation within the positive electrode slurry 22 and negative reactions with the PVDF within the positive electrode slurry 22. A plurality of positive electrode particles 26, wherein the material of the positive electrode particles 26 can be selected from NCM (lithium nickel cobalt manganese oxide), LCO (lithium cobalt oxide), LMFP (lithium manganese iron phosphate), or a mixture of two thereof, are distributed in the positive electrode slurry 22. When NCM and LMFP are mixed, the ratio of NCM to LMFP is between 4:1 and 3:1 (wt%). When LCO and LMFP are mixed, the ratio of LCO to LMFP is between 4:1 and 3:1 (wt%). The NCM particles are 3 to 8 microns in size; the LCO particles are 10 to 15 microns in size; and the LMFP particles are less than 3 microns in size. Attached to the surface of each positive electrode particle 26 are a plurality of LLZO fine particles 28, a plurality of LATP fine particles 30, and a plurality of LiNO fine particles 31. Each of the LLZO fine particles 28, the LATP fine particles 30, and the LiNO fine particles 31 has a particle size of less than 200 nanometers. Typically, the outer surface of a positive electrode particle accommodates and distributes lithium ions, causing chemical molecules within the positive electrode slurry to react negatively with the lithium ions, thereby consuming available lithium ions. In this embodiment, the LLZO fine particles 28, the LATP fine particles 30, and the LiNO fine particles 31 attached to the outer surface of the positive electrode particle 26 allow for greater lithium ion conduction and improved lithium ion flow. In this embodiment, the fine particles 28, 30, and 31 preferably account for 2 to 5 wt% of the total positive electrode particles 26, and the coarse particles 24, 27, and 29 account for 2 to 5 wt% of the total positive electrode slurry 26. The total weight of the positive electrode particles 26 accounts for 90-97 wt% of the total positive electrode slurry layer 23. As shown in FIG1 , the present invention further includes a dielectric film 33 positioned between the negative electrode 10 and the positive electrode 20, with one side connected to the negative electrode and the other to the positive electrode. In this embodiment, the dielectric film 33 is divided into five layers: a first layer 32 closest to the positive electrode 20, a fifth layer 38 closest to the negative electrode 10, and a second layer 34, a third layer 35, and a fourth layer 36, respectively, disposed between the first layer 32 and the fifth layer 38. The first and fifth layers 32 and 38 are made of a mixture of PVDF, PVDF-HFP, PVA (polyvinyl alcohol), and PMMA (methyl methacrylate), with the PVA content being less than 0.2 wt%. Other materials may be added as needed. The dielectric film has good elasticity, thus filling the gap between the positive and negative electrodes 10 and 20 and providing adhesion, thereby enhancing the stability of the entire structure. The second layer 34 is made of LLZO and aluminum oxide (Al2O3). The aluminum oxide prevents oxidation reactions and achieves better thermal stability. The weight ratio of LLZO to aluminum oxide is 1:1 to 99:1. The fourth layer 36 is made of LATP and aluminum oxide. The aluminum oxide prevents oxidation reactions and achieves better thermal stability. The weight ratio of LATP to aluminum oxide is 1:1 to 99:1. The third layer 35 is made of PE or PP, with the thickness of the PE or PP being 12-17 μm. The negative electrode slurry layer 13 and the positive electrode slurry layer 23 are in contact with the dielectric film 33. The advantage of this solution lies in the inclusion of coarse LATP particles in the negative electrode slurry, which serve as a guide for lithium ions. This is primarily because LATP has a higher ionic conductivity for lithium ions than a mixed slurry of SBR and CMC. This allows for a uniform distribution of lithium ions within the negative electrode, preventing abnormal accumulation of lithium ions within the negative electrode slurry and negative reactions with the mixed slurry of SBR, CMC, etc. Furthermore, multiple fine LATP particles are attached to the surfaces of multiple silicon carbide particles (SiC particles with a tin layer). Because these LATP particles have a much higher capacity for accommodating and distributing lithium ions than SiC particles with a tin layer, and do not react negatively with lithium ions, they increase the effective capacity of the negative electrode during use and reduce the loss of lithium ions due to negative reactions. Therefore, this solution can increase the battery's overall storage capacity while extending its service life. Furthermore, coarse LLZO particles are added to the positive electrode to serve as a guide for lithium ions. Furthermore, multiple fine LLZO particles are attached to the surfaces of the multiple positive electrode particles. The LLZO fine particles have the ability to accommodate and distribute lithium ions. Typically, the outer surface of positive electrode particles accommodates and distributes lithium ions, generating a negative reaction with them and reducing the number of available lithium ions. Therefore, when lithium ions pass through the positive electrode, they are guided by the dispersed LLZO fine particles, thus dispersing the lithium ion pathway. This positive electrode design allows for a better lithium ion pathway, significantly increasing overall battery performance. In summary, this invention's user-friendly and thoughtful design meets practical needs. Its specific improvements over existing shortcomings represent a significant breakthrough compared to conventional technologies, offering a genuine improvement in efficacy that is not easily achieved. This invention has not been published or disclosed in domestic or international literature or on the market, thus complying with patent law requirements. The above detailed description is a specific description of one feasible embodiment of the present invention. However, this embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not depart from the technical spirit of the present invention should be included in the patent scope of this case. 10: negative electrode 10': negative electrode 11: negative electrode substrate 12: Negative electrode slurry 12': negative electrode slurry 13: Negative electrode slurry layer 14:LATP coarse particles 15: SiC particles with tin layer 15': Silicon carbide particles 16:LATP fine particles 17:Tin layer 20: positive electrode 20': positive electrode 21: positive electrode substrate 22: Positive electrode slurry 22': positive electrode slurry 23: positive electrode slurry layer 24:LLZO coarse particles 26: Positive electrode particles 26': positive electrode particles 27:LATP coarse particles 28:LLZO fine particles 29: LiNO coarse particles 30:LATP fine particles 30': Dielectric film 31:LiNO fine particles 32: First floor 33: Dielectric film 34: Second floor 35: The third floor 36: Fourth floor 38: Fifth floor

Claims

1. A high-efficiency solid-state or solid-state-like battery structure, comprising: a negative electrode, the negative electrode comprising: a negative electrode substrate, which is a carrier plate for supporting the negative electrode; a negative electrode slurry layer coated on the negative electrode substrate, comprising: a negative electrode slurry; a plurality of silicon carbide particles coated with a tin layer, i.e., SiC particles with a tin layer, distributed in the negative electrode slurry, the outer surface of the SiC particles with a tin layer being coated with a tin layer; wherein the thickness of the tin layer is between 1 and 20 mm; and a plurality of LATP coarse particles mixed in the negative electrode slurry for guiding lithium ions; thereby allowing lithium ions to pass through the negative electrode slurry. The negative electrode exhibits a uniform channel distribution, resulting in less negative reaction. Multiple LATP fine particles are attached to the outer surface of the tin layer of each tin-layered SiC particle. Because the LATP fine particles have a much higher capacity for accommodating and equalizing lithium ions than the tin-layered SiC particles, and do not produce negative reactions with lithium ions, they can increase the effective capacitance of the entire negative electrode during use. A positive electrode and a dielectric film are located between the negative and positive electrodes, connected to the negative electrode on one side and the positive electrode on the other. The negative electrode paste layer is in contact with the dielectric film. The electrode comprises: a positive electrode substrate, which is a carrier plate for supporting the positive electrode; a positive electrode slurry layer coated on the positive electrode substrate, wherein the positive electrode slurry layer is in contact with the dielectric film, the positive electrode slurry layer comprising: a positive electrode slurry; multiple LLZO coarse particles, multiple LATP coarse particles, and multiple LiNO (lithium nickel oxide) coarse particles, mixed in the positive electrode slurry for guiding lithium ions, thereby making the lithium ions present a uniform channel distribution inside the positive electrode, avoiding abnormal accumulation of lithium ions in the positive electrode slurry and causing negative reactions with the positive electrode slurry; The cathode material contains multiple cathode particles distributed within the cathode slurry. Each cathode particle has multiple LLZO fine particles, multiple LATP fine particles, and multiple LiNO fine particles attached to its surface. Each fine particle has a strong lithium-ion conduction capability. The proportion of LLZO, LATP, and LiNO fine particles is 2 to 5 wt% of all cathode particles. The proportion of LLZO, LATP, and LiNO coarse particles is 2 to 5 wt% of all cathode slurry. The total weight of the cathode particles accounts for 90-97 wt% of the cathode slurry layer.

2. The high-efficiency solid-state or solid-like battery structure as described in claim 1, wherein the negative electrode slurry is a mixture of SBR, CMC (carboxymethyl cellulose), and a conductive agent selected from CNT and Super-P (conductive carbon).

3. The high-efficiency solid-state or solid-like battery structure as described in claim 1, wherein the particle size of the LATP fine particles, the LLZO fine particles and the LiNO fine particles is less than 200 nanometers.

4. The high-efficiency solid-state or solid-like battery structure as described in claim 1, wherein the size of each silicon carbide particle is 15±20% micrometers.

5. The high-efficiency solid-state or solid-state-like battery structure as described in claim 1, wherein the dielectric film is divided into five layers, the first layer being closest to the positive electrode and the fifth layer being closest to the negative electrode, and the second, third, and fourth layers are sequentially disposed between the first and fifth layers; wherein the materials of the first and fifth layers are a mixture of PVDF, PVDF-HFP, PVA, and PMMA, wherein the proportion of PVA is less than 0.2 wt%, and the fifth layer has good elasticity, used to fill the gap between the positive and negative electrodes and provide adhesion; the material of the second layer is LLZO plus aluminum oxide; the material of the fourth layer is LATP plus aluminum oxide (Al2O3); and the material of the third layer is selected from PE or PP.

6. The high-efficiency solid-state or solid-like battery structure as described in claim 1, wherein in the positive electrode slurry, the particle size of the plurality of LLZO coarse particles is between 0.05 and 0.1 micrometers; the particle size of the plurality of LATP coarse particles is between 0.5 and 3 micrometers; and the particle size of the plurality of LiNO coarse particles is between 0.2 and 1 micrometer.

7. The high-efficiency solid-state or solid-state-like battery structure as described in claim 5, wherein the weight ratio of LLZO to aluminum oxide in the second layer is 1:1 to 99:1; the material of the fourth layer is LATP plus aluminum oxide, wherein the weight ratio of LATP to aluminum oxide is 1:1 to 99:1; and the thickness of PE or PP in the third layer is 12-17 μm.

8. The high-efficiency solid-state or solid-like battery structure as described in claim 1, wherein in the negative electrode, the proportion of the LATP fine particles is 0.3 to 0.8 wt% of the total negative electrode slurry; and the proportion of the LATP coarse particles is 0.3 to 0.8 wt% of the total negative electrode slurry.

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