Lithium ion battery and electric device
By adding methyl acetate to the electrolyte of lithium-ion batteries and using mesoporous silica functional materials in the negative electrode active layer, the problem of low lithium-ion transport efficiency under thick electrodes was solved, and the performance of lithium-ion batteries under high rate and low temperature conditions was improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU RELIANCE ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2026-06-11
- Publication Date
- 2026-07-24
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] This invention relates to the field of battery technology, and more specifically, to a lithium-ion battery and an electrical device thereof. Background Technology
[0002] As the energy density requirements of electric vehicles and energy storage systems continue to increase, lithium-ion batteries are developing towards thicker electrodes. When the thickness of the negative electrode active layer on one side exceeds 60μm, lithium ions face long-distance transport in both the bulk electrolyte and the electrode interior, leading to a decrease in the battery's rate performance and severe capacity decay at low temperatures.
[0003] In view of this, the present invention is proposed. Summary of the Invention
[0004] The purpose of this invention is to provide a lithium-ion battery and electrical equipment to solve or improve the above-mentioned technical problems.
[0005] This invention can be implemented as follows: In a first aspect, the present invention provides a lithium-ion battery, the lithium-ion battery comprising an electrolyte and a negative electrode; The electrolyte contains methyl acetate; the mass percentage of methyl acetate in the electrolyte is C1, expressed as % . The negative electrode includes a negative electrode active layer with a single-sided thickness of L (μm); the negative electrode active layer contains mesoporous silica functional material; the mass percentage of the mesoporous silica functional material in the negative electrode active layer is C2 (%). (C1×C2) / L≥0.01(% 2 / μm).
[0006] In an optional implementation, (C1×C2) / L ≥ 0.04% 2 / μm).
[0007] In an optional implementation, C1 is 2% to 20%.
[0008] In an optional implementation, C1 is 3% to 15%.
[0009] In an optional implementation, C2 is 0.1% to 5%.
[0010] In an optional implementation, C2 is 0.5% to 2%.
[0011] In an optional implementation, L > 60 μm.
[0012] In an optional implementation, L is 60 μm to 200 μm.
[0013] In an optional embodiment, the mesoporous silica functional material also has at least one of the following characteristics: Feature 1: The specific surface area of mesoporous silica functional materials is ≥300m². 2 / g; Feature 2: The pore size of the mesoporous silica functional material is 2nm~50nm; preferably 5nm~30nm; Feature 3: The pore volume of mesoporous silica functional materials is ≥0.5 cm³. 3 / g; Feature 4: The particle size of the mesoporous silica functional material is 50nm~10μm.
[0014] In an optional embodiment, the electrolyte further comprises at least one of fluoroethylene carbonate and vinylene carbonate.
[0015] In an optional embodiment, the negative electrode active layer further comprises a negative electrode active material, which includes at least one of graphite, silicon-carbon composite material, silicon suboxide, and hard carbon.
[0016] In an optional embodiment, the lithium-ion battery further has at least one of the following features: Feature 5: The DC internal resistance (DCR) of the lithium-ion battery does not exceed 13.8 mΩ; Feature 6: The DCR reduction rate of the lithium-ion battery at 25°C and 1C discharge for 10s is no less than 8.6%; Feature 7: The lithium-ion battery retains ≥68% of its capacity when discharged at a 0.2C rate at a low temperature of -20°C. Feature 8: Under conditions of 25°C, the ratio of the capacity of the lithium-ion battery discharged at a 1C rate to the capacity discharged at a 0.2C rate is ≥83%; Feature 9: The lithium-ion battery is a cylindrical battery with all tabs.
[0017] Secondly, the present invention provides an electrical device including a lithium-ion battery according to any of the foregoing embodiments.
[0018] The beneficial effects of this invention include: This invention reduces electrolyte viscosity and improves bulk ion transport by introducing methyl acetate into the electrolyte; and utilizes mesoporous silica functional materials in the negative electrode active layer to construct rapid intra-electrode ion transport channels. By creatively establishing the relationship between C1, C2, and L, P = (C1 × C2) / L ≥ 0.01%. 2 The / μm) can ensure simultaneous improvement of both bulk and intra-electrode channels in thick electrode scenarios, enabling lithium-ion batteries to have good rate performance and low-temperature performance. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.
[0020] The lithium-ion battery and electrical equipment provided by the present invention will be described in detail below.
[0021] The present invention provides a lithium-ion battery comprising an electrolyte and a negative electrode.
[0022] The electrolyte contains methyl acetate (MA); the mass percentage of methyl acetate in the electrolyte is C1, expressed as % . The negative electrode includes a negative electrode active layer with a single-sided thickness of L (μm); the negative electrode active layer contains mesoporous silica functional material; the mass percentage of the mesoporous silica functional material in the negative electrode active layer is C2 (%). (C1×C2) / L≥0.01(% 2 / μm).
[0023] Methyl acetate (MA), as a low-viscosity linear carboxylic acid ester solvent, can significantly reduce electrolyte viscosity and improve bulk ion transport. Mesoporous silica functional materials possess high specific surface area and ordered mesoporous channels, which, when filled with electrolyte, can provide rapid lithium-ion diffusion channels. This invention reduces electrolyte viscosity and improves bulk ion transport by introducing methyl acetate into the electrolyte; and by introducing mesoporous silica functional materials into the negative electrode active layer, its mesoporous channels can be used to construct rapid intra-electrode ion transport channels.
[0024] For ease of understanding, (C1×C2) / L is defined as parameter P, which quantitatively describes the net efficiency of C1 and C2 after dilution by the thickness of the negative electrode. The physical meaning of P is: the dual-kinetic improvement density per unit thickness. Here, the numerator C1×C2 represents the product effect when MA and mesoporous silica are present simultaneously; the denominator L represents the dilution effect of thickness on the improvement effect. As an example, for thicker electrodes, the improvement effect of the same amount of MA and mesoporous silica is distributed over a longer transport path, thus requiring a higher C1×C2 product to achieve the same effect. Based on the above physical meaning, the physical condition corresponding to P≥0.01 is: on a negative electrode active layer of unit thickness (1 μm), at least 0.01% of the required efficiency is needed. 2 The invention creatively improves density by achieving P≥0.01 (%). 2 Using μm as an effective synergistic threshold, we ensure that the dual channels in the bulk phase and within the electrode are improved simultaneously in thick electrode scenarios, enabling lithium-ion batteries to have good rate performance and low-temperature performance.
[0025] In some preferred embodiments, (C1×C2) / L≥0.04(%) 2 / μm), such as (C1×C2) / L is 0.04 (%) 2 / μm)~0.2(% 2 / μm), such as 0.04 (%) 2 / μm), 0.08 (% 2 / μm), 0.1 (% 2 / μm), 0.1875 (% 2 / μm) or 0.2 (% 2 (e.g., μm). Within this range, lithium-ion batteries can achieve better performance.
[0026] In some alternative implementations, C1 can be 2% to 20%, such as 2%, 5%, 8%, 10%, 12%, 15%, 18%, or 20%, or other values within the range of 2% to 20%. In some more typical implementations, C1 is 3% to 15%, such as 3%, 5%, 6%, 8%, 10%, or 15%.
[0027] If C1 is less than 2%, it is not conducive to effectively reducing the viscosity of the electrolyte phase, and the improvement of bulk ion transport kinetics is insufficient, making it difficult to overcome the concentration polarization bottleneck in thick electrode scenarios. If C1 is greater than 20%, it is not conducive to the electrochemical window stability of the electrolyte and the film formation quality of the SEI film. Excessive low-boiling-point carboxylic acid ester solvent can easily lead to an increased risk of volatilization, aggravated interfacial side reactions and reduced cycle life, and will also excessively dilute the carbonate main solvent, weakening the efficiency of film-forming additives such as FEC / VC.
[0028] In some alternative implementations, C2 can be 0.1% to 5%, such as 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%, or other values within the range of 0.1% to 5%. In some more typical implementations, C2 is 0.5% to 2%, such as 0.5%, 1%, 1.5%, or 2%.
[0029] If C2 is less than 0.1%, it is not conducive to building a continuous and effective mesoporous ion transport network inside the negative electrode active layer. The pore conduction effect is weak and cannot compensate for the long-range diffusion loss of the thick electrode. If C2 is greater than 5%, it is not conducive to improving the energy density of the negative electrode. Too much inert component will significantly reduce the volume ratio of active material, increase the viscosity of slurry and the difficulty of coating, and may lead to increased irreversible electrolyte consumption and obstruction of the electron conduction network inside the electrode due to excessive specific surface area.
[0030] In some optional implementations, L > 60 μm. In some more typical implementations, L is 60 μm to 200 μm, such as 60 μm, 80 μm, 100 μm, 150 μm or 200 μm, etc., or it can be other values in the range of 60 μm to 200 μm, such as 60 μm, 80 μm, 100 μm, 150 μm or 200 μm.
[0031] If L is less than 60 μm, it is not conducive to realizing the original design intention of thick electrodes to improve the energy density of monomers. At this time, the ion transport path is relatively short, and the economy and necessity of introducing a dual-channel synergistic system in this scheme are insufficient. If L is greater than 200 μm, it is not conducive to the coating process window and the mechanical integrity of the electrode. Excessive tortuosity in the electrode can easily cause drying cracks, powdering and dead zone accumulation. Even if C1 / C2 is increased, it is difficult to break through the physical diffusion limit, which instead leads to a cliff-like drop in rate capability and low-temperature performance.
[0032] In some alternative embodiments, the specific surface area of the mesoporous silica functional material is ≥300 m². 2 / g, for example, can be 300m 2 / g~850m 2 / g.
[0033] In some optional embodiments, the pore size of the mesoporous silica functional material is 2nm to 50nm, such as 2nm, 5nm, 10nm, 20nm, 30nm, 40nm, or 50nm, or other values within the range of 2nm to 50nm. In some more typical embodiments, the pore size of the mesoporous silica functional material is 5nm to 30nm.
[0034] In some alternative embodiments, the pore volume of the mesoporous silica functional material is ≥0.5 cm³. 3 / g, for example, can be 0.5cm 3 / g~1cm 3 / g.
[0035] In some alternative embodiments, the particle size of the mesoporous silica functional material is 50 nm to 10 μm, such as 50 nm, 100 nm, 1 μm, 2 μm, 5 μm or 10 μm, or other values in the range of 50 nm to 10 μm.
[0036] In some alternative embodiments, the electrolyte further comprises at least one of fluoroethylene carbonate and vinylene carbonate.
[0037] For example, the electrolyte can be obtained by mixing a lithium salt with an organic solvent. The lithium salt may include, for example, LiPF6; the organic solvent may include methyl acetate, and may further include at least one of fluoroethylene carbonate (FEC) and vinylene carbonate (VC), and may also include ethylene carbonate (EC).
[0038] In some alternative embodiments, the negative electrode active layer further includes a negative electrode active material, which includes at least one of graphite (such as artificial graphite), silicon-carbon composite material, silicon suboxide, and hard carbon.
[0039] In some alternative embodiments, the negative electrode active layer further includes a conductive agent and a binder, wherein the conductive agent may exemplary include conductive carbon black, and the binder may exemplary include at least one of styrene-butadiene rubber (SBR) and sodium carboxymethyl cellulose (CMC).
[0040] For example, the preparation of the negative electrode active layer may include: mixing a negative electrode active material, a mesoporous silica functional material, a binder and a conductive agent to obtain a negative electrode active slurry; coating the negative electrode active slurry onto at least one side surface of a negative electrode current collector (such as copper foil), drying and rolling.
[0041] In some alternative implementations, the lithium-ion battery retains ≥68% capacity when discharged at a 0.2C rate at a low temperature of -20°C, such as 68%~78%.
[0042] In some alternative implementations, the DC internal resistance (DCR) of the lithium-ion battery does not exceed 13.8 mΩ, such as 11.8 mΩ to 13.8 mΩ.
[0043] In some optional implementations, the lithium-ion battery has a DCR reduction rate of not less than 8.6% at 25°C and discharged at 1C for 10s, such as 8.6% to 21.9%.
[0044] In some alternative implementations, the ratio of the capacity of the lithium-ion battery discharged at 1C rate to the capacity discharged at 0.2C rate at 25°C is ≥83%, such as 83%~91%.
[0045] In some alternative implementations, the lithium-ion battery is a multi-tab cylindrical battery.
[0046] In addition, the present invention also provides an electrical device comprising the aforementioned lithium-ion battery.
[0047] The features and performance of the present invention will be further described in detail below with reference to embodiments.
[0048] Example 1 This embodiment provides a lithium-ion battery, the preparation method of which includes: S1: Prepare the negative electrode.
[0049] The negative electrode active material (artificial graphite) and mesoporous silica functional material (SBA-15 type, with a specific surface area of 400 m²) are used. 2 / g, pore size 15nm, pore volume 0.8cm³ 3 A mixture of styrene-butadiene rubber (SBR) and sodium carboxymethyl cellulose (CMC) in a mass ratio of 2:1 (g / g, particle size 3.2 μm) was homogeneously mixed in deionized water to obtain a negative electrode active slurry. The resulting slurry was uniformly coated onto a copper foil current collector, and after drying and rolling, a negative electrode sheet was obtained. The single-sided thickness L of the negative electrode active layer was controlled to be 60 μm by adjusting the coating amount.
[0050] S2: Prepare electrolyte.
[0051] In an argon-filled glove box (water content <0.1 ppm, oxygen content <0.1 ppm), LiPF6 was dissolved in an organic solvent to obtain an electrolyte with a concentration of 1 mol / L. The organic solvent was a mixture of ethylene carbonate (EC), dimethyl carbonate (DMC), methyl acetate (MA), and fluoroethylene carbonate (FEC) in a specific ratio, wherein ethylene carbonate (EC) accounted for 35% by mass, dimethyl carbonate (DMC) accounted for 50% by mass, MA accounted for 5% by mass (Cl), and fluoroethylene carbonate (FEC) accounted for 10% by mass.
[0052] S3: Assembly of lithium-ion batteries.
[0053] NCM811 was used as the positive electrode active material with an areal loading of 20±1 mg / cm³. 2 The positive electrode is formed by assembling the negative electrode, positive electrode, and polyethylene separator (12μm) into a stacked soft-pack battery. After injecting the electrolyte, the battery is packaged and formed (charged at a constant current of 0.05C to 4.2V, then discharged to 4.0V) to obtain a lithium-ion battery.
[0054] The P of this lithium-ion battery is calculated as P = (C1 × C2) / L = (5 × 0.5) / 60 = 0.042 (%). 2 / μm), rounded to the nearest whole number.
[0055] Example 2 The difference between this embodiment and Embodiment 1 is that: C1=8%, C2=1.5%, L=150μm, and P=(C1×C2) / L=(8×1.5) / 150=0.080(%) 2 / μm).
[0056] Example 3 The difference between this embodiment and Embodiment 1 is that: C1=10%, C2=2.0%, L=100μm, P=(C1×C2) / L=(10×2.0) / 100=0.200(%) 2 / μm).
[0057] Example 4 The difference between this embodiment and Embodiment 1 is that: C1=15%, C2=1.0%, L=80μm, and P=(C1×C2) / L=(15×1.0) / 80=0.1875(%). 2 / μm).
[0058] Example 5 The difference between this embodiment and Embodiment 1 is that: C1=6%, C2=1.0%, L=200μm, P=(C1×C2) / L=(6×1.0) / 200=0.030(%) 2 / μm).
[0059] Example 6 The difference between this embodiment and Embodiment 1 is that: C1=3%, C2=2.0%, L=150μm, P=(C1×C2) / L=(3×2.0) / 150=0.040(%) 2 / μm).
[0060] Example 7 The difference between this embodiment and Embodiment 1 is that the mesoporous silica functional material is type SBA-15 with a specific surface area of 300 m². 2 / g, pore size 5nm, pore volume 0.5cm³ 3 / g, particle size 50nm. Other conditions (C1=5%, C2=0.5%, L=60μm) and performance testing are the same as in Example 1.
[0061] Example 8 The difference between this embodiment and Embodiment 1 is that the mesoporous silica functional material is type FDU-15 with a specific surface area of 850 m². 2 / g, pore size 30nm, pore volume 1.0cm³ 3 / g, particle size 10μm. Other conditions (C1=5%, C2=0.5%, L=60μm) and performance testing are the same as in Example 1.
[0062] Comparative Example 1 The difference between this comparative example and Example 1 is that: C1=2%, C2=0.1%, L=100μm, and P=(C1×C2) / L=(2×0.1) / 100=0.002% 2 / μm).
[0063] Comparative Example 2 The difference between this comparative example and Example 1 is that: C1=5%, C2=0.3%, L=200μm, and P=(C1×C2) / L=(5×0.3) / 200=0.0075% 2 / μm).
[0064] Comparative Example 3 The difference between this comparative example and Example 1 is that: C1=3%, C2=0.1%, L=60μm, and P=(C1×C2) / L=(3×0.1) / 60=0.005(%) 2 / μm).
[0065] Comparative Example 4 The difference between this comparative example and Example 2 is that: C1=8%, C2=0%, L=150μm, P=(C1×C2) / L=(8×0) / 150=0(%) 2 / μm).
[0066] Comparative Example 5 The difference between this comparative example and Example 2 is that: C1=0%, C2=1.5%, L=150μm, and P=(C1×C2) / L=(0×1.5) / 150=0 (%) 2 / μm).
[0067] Comparative Example 6 The difference between this comparative example and Example 2 is that: C1=0%, C2=0%, L=150μm, P=(C1×C2) / L=(0×0) / 150=0 (%) 2 / μm).
[0068] Test case The following performance tests were performed on the lithium-ion batteries obtained in Examples 1-8 and Comparative Examples 1-6: (1) DCR test The DC internal resistance of the battery was tested using the hybrid pulse power characteristic (HPPC) method. The battery was discharged at 1C for 10 seconds at 25°C, and the voltage drop and DCR were recorded.
[0069] (2) Low temperature performance test Discharge at 0.2C to the cutoff voltage at 25°C and record the discharge capacity. Then discharge at 0.2C to the cutoff voltage at -20°C and record the discharge capacity. Calculate the low-temperature capacity retention rate (-20°C / 0.2C capacity retention rate).
[0070] (3) Ratio performance test At 25°C, discharge to the cutoff voltage at rates of 0.2C and 1C, respectively, and record the discharge capacity. Calculate the 1C / 0.2C capacity ratio.
[0071] The test results are shown in Table 1.
[0072] Table 1 Test Results
[0073] As can be seen from Table 1: (1) P in Examples 1-8 is ≥0.01 (%) 2 The corresponding DCR reduction rates are all 8.6% or higher, the capacity retention rate at -20°C / 0.2C is 68% or higher, and the capacity ratio at 1C / 0.2C is 83% or higher. This indicates that under the conditions that the electrolyte of the lithium-ion battery contains methyl acetate and the negative electrode active layer contains mesoporous silica functional material, C1, C2, L and P all meet the scope of this invention, and can obtain good DCR reduction effect and better rate performance.
[0074] (2) For comparative examples 1-3, P < 0.01 (%) 2 The corresponding DCR reduction rate was only 3.3% ( / μm), the capacity retention rate at -20°C / 0.2C was only 60%, and the capacity ratio at 1C / 0.2C was only 78%, showing a significant performance degradation compared to the examples. This indicates that even if the electrolyte of the lithium-ion battery contains methyl acetate and the negative electrode active layer contains mesoporous silica functional materials, improper setting of C1, C2, and L can result in P < 0.01% 2 Even with a diameter of 100 μm (μm), it is still difficult to achieve a good DCR reduction effect and also difficult to obtain good rate performance.
[0075] (3) In Comparative Example 4, the negative electrode active layer does not contain mesoporous silica functional material, and the corresponding DCR reduction rate is only 5.3%, and the capacity retention rate at -20°C / 0.2C is only 64%. In Comparative Example 5, the electrolyte does not contain methyl acetate, and the corresponding DCR reduction rate is only 3.3%, and the capacity retention rate at -20°C / 0.2C is only 62%. This shows that if the electrolyte of a lithium-ion battery does not contain methyl acetate, or the negative electrode active layer does not contain mesoporous silica functional material, it is not conducive to improving the DCR reduction rate and rate performance of the lithium-ion battery.
[0076] (4) Combining Example 2 and Comparative Examples 4-6, it can be seen that the DCR reduction rate of Example 2 is 12.6%, while the DCR reduction rate of Comparative Example 4 is only 5.3%, and the DCR reduction rate of Comparative Example 5 is only 3.3%. It can be seen that the solution provided in Example 2 is more effective than the sum of Comparative Examples 4 and 5 in terms of DCR reduction rate, that is, 12.6% > (5.3% + 3.3%) = 8.6%, which proves that the methyl acetate contained in the electrolyte and the mesoporous silica functional material contained in the negative electrode active layer can play a synergistic role in reducing DCR under the conditions of C1, C2, L and P of this invention.
[0077] In summary, this invention reduces electrolyte viscosity and improves bulk ion transport by introducing methyl acetate into the electrolyte; and utilizes mesoporous silica functional materials in the negative electrode active layer to construct rapid intra-electrode ion transport channels. By creatively establishing the relationship between C1, C2, and L, P = (C1 × C2) / L ≥ 0.01%. 2 The / μm) can ensure simultaneous improvement of both bulk and intra-electrode channels in thick electrode scenarios, enabling lithium-ion batteries to have good rate performance and low-temperature performance.
[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A lithium-ion battery, characterized in that, The lithium-ion battery includes an electrolyte and a negative electrode; The electrolyte contains methyl acetate; the mass percentage of methyl acetate in the electrolyte is C1, expressed as % . The negative electrode includes a negative electrode active layer with a single-sided thickness of L (μm); the negative electrode active layer contains a mesoporous silica functional material; the mass percentage of the mesoporous silica functional material in the negative electrode active layer is C2 (%). (C1×C2) / L≥0.01(% 2 / μm)。 2. The lithium-ion battery according to claim 1, characterized in that, (C1×C2) / L≥0.04(% 2 / μm)。 3. The lithium-ion battery according to claim 1 or 2, characterized in that, C1 is 2%~20%; Preferably, C1 is 3% to 15%.
4. The lithium-ion battery according to claim 1 or 2, characterized in that, C2 is 0.1%~5%; Preferably, C2 is 0.5% to 2%.
5. The lithium-ion battery according to claim 1 or 2, characterized in that, L > 60 μm; Preferably, L is 60μm~200μm.
6. The lithium-ion battery according to claim 1 or 2, characterized in that, The mesoporous silica functional material also has at least one of the following characteristics: Feature 1: The specific surface area of the mesoporous silica functional material is ≥300m². 2 / g; Feature 2: The pore size of the mesoporous silica functional material is 2nm~50nm; preferably 5nm~30nm; Feature 3: The pore volume of the mesoporous silica functional material is ≥0.5 cm³. 3 / g; Feature 4: The particle size of the mesoporous silica functional material is 50 nm to 10 μm.
7. The lithium-ion battery according to claim 1 or 2, characterized in that, The electrolyte also contains at least one of fluoroethylene carbonate and vinylene carbonate.
8. The lithium-ion battery according to claim 1 or 2, characterized in that, The negative electrode active layer also contains a negative electrode active material, which includes at least one of graphite, silicon-carbon composite material, silicon suboxide, and hard carbon.
9. The lithium-ion battery according to claim 1 or 2, characterized in that, The lithium-ion battery also has at least one of the following characteristics: Feature 5: The DC internal resistance (DCR) of the lithium-ion battery does not exceed 13.8 mΩ; Feature 6: The lithium-ion battery exhibits a DCR reduction rate of no less than 8.6% at 25°C and 1C discharge for 10 seconds. Feature 7: The lithium-ion battery retains ≥68% of its capacity when discharged at a rate of 0.2C under low temperature conditions of -20°C. Feature 8: The ratio of the capacity of the lithium-ion battery discharged at 1C rate to the capacity discharged at 0.2C rate under 25°C conditions is ≥83%; Feature 9: The lithium-ion battery is a cylindrical battery with all tabs.
10. An electrical appliance, characterized in that, Includes the lithium-ion battery as described in any one of claims 1 to 9.