CN114843600A - Electrolyte for lithium battery, preparation method of electrolyte and lithium battery - Google Patents
Electrolyte for lithium battery, preparation method of electrolyte and lithium battery Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0569—Liquid materials characterised by the solvents
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
- H01M2300/0028—Organic electrolyte characterised by the solvent
- H01M2300/0037—Mixture of solvents
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Abstract
The invention discloses an electrolyte for a lithium battery, which comprises lithium salt, a non-aqueous organic solvent and an additive, wherein the additive is alkyl boric acid, and the weight percentage content of the additive is 0.5-2.0 wt%. The alkyl boric acid is one or a mixture of more of n-propyl boric acid, n-hexyl boric acid and n-octyl boric acid. The invention also discloses a preparation method of the electrolyte for the lithium battery, and the lithium battery prepared by adopting the electrolyte. The electrolyte for the lithium battery, the preparation method thereof and the lithium battery can solve the problem of low charging and discharging times of the conventional lithium battery, and have the advantages of good cycle stability and slow specific capacity attenuation.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to an electrolyte for a lithium battery, a preparation method of the electrolyte and the lithium battery.
Background
The lithium battery has the advantages of environmental protection, no memory effect, relatively high energy density and the like, and is popular in the market of energy storage equipment. The energy density is the energy that can be stored/released per unit mass or per unit volume of lithium battery, and is one of the important indexes for measuring the quality of the battery. The power battery for the vehicle generally needs to have higher energy density. Common methods for increasing the energy density of the battery include increasing the voltage of the positive electrode, increasing the specific capacity of the electrode, and the like.
At present, graphite is mostly used as a negative electrode in commercial lithium batteries, however, the theoretical specific capacity of the graphite negative electrode is only 372mAh/g, and the demand of the market on a high-energy-density battery electrode material is difficult to meet. In contrast, metallic lithium cathodes have theoretical capacities of up to 3860mAh/g and have lower lithium storage potentials, which all contribute to increasing the energy density of the battery. However, side reactions are brought about due to excessively high reactivity; and lithium dendrite growth caused by disordered lithium deposition, so that the problems of low charging and discharging times, potential safety hazards and the like exist, and the large-scale application of the metal lithium cathode is prevented.
Disclosure of Invention
The invention aims to provide an electrolyte for a lithium battery, which solves the problem of low charging and discharging times of the existing lithium battery. Another object of the present invention is to provide a method for preparing the above electrolyte for a lithium battery, and a lithium battery comprising the above electrolyte for a lithium battery.
In order to achieve the purpose, the invention provides electrolyte for a lithium battery, which comprises lithium salt, a non-aqueous organic solvent and an additive, wherein the additive is alkyl boric acid, and the weight percentage content of the additive is 0.5-2.0 wt%;
the alkyl boric acid is one or a mixture of more of n-propyl boric acid, n-hexyl boric acid and n-octyl boric acid;
the structural formula of n-propylboronic acid is:
the structural formula of n-hexylboronic acid is:
the structural formula of n-octylboronic acid is:
preference is given toThe concentration of the lithium salt is 1M, and the lithium salt is LiPF 6 、LiBF 4 、LiBOB、LiDFOB、LiSbF 6 、LiAsF 6 、LiN(SO 2 CF 3 ) 2 、LiN(SO 2 C 2 F 5 ) 2 、LiC(SO 2 CF 3 ) 3 Or LiN (SO) 2 F) 2 One or a mixture of several of them.
Preferably, the non-aqueous organic solvent is a mixture of cyclic carbonate and chain carbonate, and the volume ratio of the cyclic carbonate to the chain carbonate is 3:7-7: 3; the cyclic carbonate is one or a mixture of more of ethylene carbonate, propylene carbonate or butylene carbonate, and the chain carbonate is one or a mixture of more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate or propyl methyl carbonate.
The preparation method of the electrolyte for the lithium battery comprises the following steps:
s1, in a glove box, H 2 O<0.1ppm，O 2 <0.1ppm, weighing a proper amount of lithium salt, and dissolving the lithium salt in a nonaqueous organic solution, wherein the concentration of the lithium salt is 1M, so as to obtain a matrix electrolyte;
and S2, adding 0.5-2.0 wt% of additive into the matrix electrolyte, and uniformly stirring to obtain the electrolyte for the lithium battery.
A lithium battery containing the electrolyte for the lithium battery comprises a battery shell, and a positive electrode, a negative electrode, a diaphragm and the electrolyte which are positioned in the battery shell.
Preferably, the positive electrode includes a positive electrode current collector and a positive electrode material on the positive electrode current collector, and the positive electrode material includes a positive electrode active material.
Preferably, the positive active material is LiCoO 2 、LiNiO 2 、LiMn 2 O 4 、LiCo 1-y M y O 2 、LiNi 1-y M y O 2 、LiMn 2-y M y O 4 And LiNi x Co y Mn z M 1-x-y-z O 2 One or a mixture of several of them; wherein M is Fe, Co, Ni, Mn, Mg, Cu,One or a mixture of more of Zn, Al, Sn, B, Ga, Cr, Sr, V or Ti, wherein y is more than or equal to 0 and less than or equal to 1, x is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, and x + y + z is less than or equal to 1.
Preferably, the positive active material is LiFe 1-x M x PO 4 Wherein M is one or a mixture of more of Mn, Mg, Co, Ni, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V or Ti, and x is more than or equal to 0 and less than 1.
Preferably, the negative electrode comprises a negative electrode current collector and a negative electrode material positioned on the negative electrode current collector, and the negative electrode material is one or a mixture of more of graphite, hard carbon, soft carbon, a silicon-carbon composite material, a silicon-oxygen-carbon composite material, metal lithium and an alloy of the metal lithium.
Preferably, the separator is one or more of a polyolefin porous membrane, a nonwoven fabric, a fiber coating, a ceramic coating, and an inorganic solid electrolyte coating.
According to the electrolyte for the lithium battery, the preparation method of the electrolyte and the lithium battery, the alkyl boric acid additive is added into the electrolyte, the alkyl boric acid additive reacts with the metal lithium cathode, and the lithium boron alloy is generated on the surface of the metal lithium cathode in situ and has high lithium conductivity, so that the growth of lithium dendrites can be inhibited, and the cycling stability and the safety performance of the battery can be improved. The full cell stability of Li | | | NCM622 is improved because the growth of dendrites is inhibited.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a diagram showing cycle life of a symmetric lithium battery prepared by using an electrolyte 1 for a lithium battery and a method for preparing the same;
FIG. 2 is a cycle life diagram of a symmetric lithium battery prepared using the electrolyte for lithium battery and the preparation method thereof and the electrolyte 2 for lithium battery of the present invention;
FIG. 3 is a cycle life diagram of a symmetric lithium battery prepared using an electrolyte 3 for a lithium battery and a method of preparing the same according to the present invention;
FIG. 4 is a cycle life diagram of a symmetric lithium battery prepared using the electrolyte 4 for a lithium battery and a method of preparing the same according to the present invention;
FIG. 5 is a cycle life diagram of a symmetric lithium battery prepared using the electrolyte 5 for a lithium battery and a method of preparing the same according to the present invention;
FIG. 6 is a cycle life diagram of a symmetric lithium battery prepared using the electrolyte 6 for a lithium battery and a method of preparing the same according to the present invention;
FIG. 7 is a cycle life diagram of a symmetric lithium battery prepared using the electrolyte 7 for a lithium battery and a method of preparing the same according to the present invention;
FIG. 8 is a cycle life diagram of a symmetric lithium battery prepared using an electrolyte for a lithium battery of the present invention, a method of preparing the same, and a comparative electrolyte 1 for a lithium battery;
fig. 9 is a graph showing cycle performance of a full cell prepared using the electrolyte 1 for a lithium battery and the comparative electrolyte 1 of a lithium battery according to the present invention and a method for preparing the same.
Detailed Description
An electrolyte for a lithium battery comprises lithium salt, a non-aqueous organic solvent and an additive, wherein the additive is alkyl boric acid, and the weight percentage content of the additive is 0.5-2.0 wt%.
The alkyl boric acid is one or a mixture of several of n-propyl boric acid, n-hexyl boric acid and n-octyl boric acid.
N-propylboronic acid R 1 The structural formula of (A) is:
n-hexylboronic acid R 2 The structural formula of (A) is:
n-octyl boronic acid R 3 The structural formula of (A) is as follows:
the alkyl boric acid additive reacts with the lithium metal cathode to generate lithium boron alloy in situ on the surface of the lithium metal cathode, and the lithium boron alloy has high lithium conductivity, so that the growth of lithium dendrites can be inhibited, and the cycling stability and the safety performance of the battery are improved. In addition, since the growth of dendrites is suppressed, the full cell stability of Li | | | NCM622 is improved.
The concentration of lithium salt is 1M, and the lithium salt is LiPF 6 、LiBF 4 、LiBOB、LiDFOB、LiSbF 6 、LiAsF 6 、LiN(SO 2 CF 3 ) 2 、LiN(SO 2 C 2 F 5 ) 2 、LiC(SO 2 CF 3 ) 3 Or LiN (SO) 2 F) 2 One or a mixture of several of them.
The non-aqueous organic solvent is a mixture of cyclic carbonate and chain carbonate, and the volume ratio of the cyclic carbonate to the chain carbonate is 3:7-7: 3; the cyclic carbonate is one or a mixture of more of ethylene carbonate, propylene carbonate or butylene carbonate, and the chain carbonate is one or a mixture of more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate or propyl methyl carbonate. The mixed solution of the cyclic carbonate organic solvent with high dielectric constant and the chain carbonate organic solvent with low viscosity is used as the solvent of the lithium ion battery electrolyte, so that the mixed solution of the organic solvents simultaneously has high ionic conductivity, high dielectric constant and low viscosity.
The preparation method of the electrolyte for the lithium battery comprises the following steps:
s1, in a glove box, H 2 O<0.1ppm，O 2 <0.1ppm, weighing a proper amount of lithium salt, and dissolving the lithium salt in a nonaqueous organic solution, wherein the concentration of the lithium salt is 1M, so as to obtain a matrix electrolyte;
s2, adding 0.5-2.0 wt% of additive into the matrix electrolyte, and stirring uniformly to obtain the electrolyte for the lithium battery.
A lithium battery containing the electrolyte for the lithium battery comprises a battery shell, and a positive electrode, a negative electrode, a diaphragm and the electrolyte which are positioned in the battery shell.
The positive electrode includes a positive current collector and a positive electrode material on the positive current collector, the positive electrode material including a positive active material.
Alternatively, the positive electrode active material is LiCoO 2 、LiNiO 2 、LiMn 2 O 4 、LiCo 1-y M y O 2 、LiNi 1-y M y O 2 、LiMn 2- y M y O 4 And LiNi x Co y Mn z M 1-x-y-z O 2 One or a mixture of several of them; wherein M is one or a mixture of more of Fe, Co, Ni, Mn, Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V or Ti, y is more than or equal to 0 and less than or equal to 1, x is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, and x + y + z is less than or equal to 1.
The positive active material is LiFe 1-x M x PO 4 Wherein M is one or a mixture of more of Mn, Mg, Co, Ni, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V or Ti, and x is more than or equal to 0 and less than 1.
The negative electrode comprises a negative electrode current collector and a negative electrode material positioned on the negative electrode current collector, wherein the negative electrode material is one or a mixture of more of graphite, hard carbon, soft carbon, a silicon-carbon composite material, a silicon-oxygen-carbon composite material, metal lithium and an alloy of the metal lithium.
The separator is one or more of polyolefin porous membrane, non-woven fabric, fiber coating, ceramic coating and inorganic solid electrolyte coating.
The technical solution of the present invention is further illustrated by the accompanying drawings and examples.
Example 1
In a glove box (H) 2 O<0.1ppm，O 2 <0.1ppm), an appropriate amount of lithium hexafluorophosphate (LiPF) was weighed 6 ) And dissolving the precursor electrolyte in a non-aqueous organic solution to obtain a precursor electrolyte.
Lithium salt concentration: 1M lithium hexafluorophosphate (LiPF) 6 )；
Non-aqueous organic solvent: ethylene Carbonate (EC), a mixed solvent of dimethyl carbonate (DMC) 1:1(v: v);
in a matrix electrolyteAdding n-hexylboronic acid R with the mass fraction of 1.0 wt% 2 The compound shown was uniformly stirred to obtain an electrolyte solution 1.
Example 2
An electrolyte was prepared as described in example 1, except that 1.0 wt% n-propylboronic acid R was added to the parent electrolyte 1 Thus, working electrolyte 2 was obtained.
Example 3
An electrolyte was prepared as described in example 1, except that 1.0 wt% n-octylboronic acid R was added to the parent electrolyte 3 Thus, working electrolyte 3 was obtained.
Example 4
An electrolyte was prepared as described in example 1, except that 0.5 wt% of n-hexylboronic acid R was added to the parent electrolyte 2 Thus, working electrolyte 4 was obtained.
Example 5
An electrolyte was prepared as described in example 1, except that 2.0 wt% n-hexylboronic acid R was added to the parent electrolyte 2 Thus, working electrolyte 5 was obtained.
Example 6
An electrolyte was prepared as described in example 1, except that the mixed solvent ratio of Ethylene Carbonate (EC) to dimethyl carbonate (DMC) in the parent electrolyte was 7:3(v: v), to give example electrolyte 6.
Example 7
An electrolyte was prepared as described in example 1, except that the mixed solvent ratio of vinyl carbonate (EC) to dimethyl carbonate (DMC) in the parent electrolyte was 3:7(v: v), to give a working electrolyte 7.
Comparative example 1
Comparative example a precursor electrolyte prepared as described in example 1 was used as comparative electrolyte 1.
Lithium batteries were prepared using the above-described example electrolytes 1 to 7 and the comparative electrolyte 1.
The preparation method of the lithium battery comprises the following steps:
lithium symmetrical batteries: in a glove box (H) 2 O<0.1ppm，O 2 <0.1ppm), sequentially assembling the positive electrode shell → the lithium sheet → the electrolyte → the diaphragm → the electrolyte → the lithium sheet → the stainless steel gasket → the negative electrode shell from bottom to top, and then transferring to a tablet press for punching and packaging to obtain the finished lithium symmetric battery.
All-battery: in a glove box (H) 2 O<0.1ppm，O 2 <0.1ppm), sequentially assembling the positive electrode shell → NCM622 pole piece → electrolyte → diaphragm → lithium piece → stainless steel gasket → spring piece → negative electrode shell from bottom to top, and then transferring to a tablet press for punching and packaging to obtain the finished full cell.
Electrochemical performance tests were performed on the assembled cells using novalr test equipment. The specific experimental process is as follows: assembling a lithium symmetric battery by taking the lithium sheets as positive and negative electrodes to perform constant current charge and discharge test; lithium sheet as negative electrode, NCM622 (LiNi) 0.6 Co 0.2 Mn 0.2 O 2 ) Is a positive active material, and is matched and assembled into a full cell for constant current charge and discharge test.
Fig. 1 is a cycle life diagram of a symmetric lithium battery prepared from an electrolyte solution for a lithium battery and a preparation method thereof and an implementation electrolyte solution 1 for the lithium battery of the present invention, fig. 2 is a cycle life diagram of a symmetric lithium battery prepared from an electrolyte solution for a lithium battery and a preparation method thereof and an implementation electrolyte solution 2 for the lithium battery of the present invention, fig. 3 is a cycle life diagram of a symmetric lithium battery prepared from an electrolyte solution for a lithium battery and a preparation method thereof and an implementation electrolyte solution 3 for the lithium battery of the present invention, and fig. 8 is a cycle life diagram of a symmetric lithium battery prepared from an electrolyte solution for a lithium battery and a preparation method thereof and a comparison electrolyte solution 1 for the lithium battery of the present invention. As shown in the figure, the polarization degree of the lithium symmetric battery prepared by using the electrolyte 1 can be still small after the battery is cycled for more than 350 hours, the polarization degree of the lithium symmetric battery prepared by using the electrolyte 2 can be still small after the battery is cycled for more than 250 hours, and the polarization degree of the lithium symmetric battery prepared by using the electrolyte 3 can be still small after the battery is cycled for more than 300 hours. The lithium symmetrical cell prepared with comparative electrolyte 1 shows severe polarization after 120 hours of cycling. Therefore, after the n-propylboric acid, the n-hexylboric acid and the n-octylboric acid are added into the electrolyte, the cycle life of the battery can be effectively prolonged.
Fig. 4 is a cycle life diagram of a symmetric lithium battery prepared by using the electrolyte solution for a lithium battery and a preparation method thereof and the implementation electrolyte solution 4 of the lithium battery of the present invention, and fig. 5 is a cycle life diagram of a symmetric lithium battery prepared by using the electrolyte solution for a lithium battery and a preparation method thereof and the implementation electrolyte solution 5 of the lithium battery of the present invention. As shown in the figure, the additive n-hexylboronic acid R in the electrolyte is changed 2 The cycle life of the obtained lithium symmetrical battery is also prolonged to a certain degree.
Fig. 6 is a cycle life diagram of a symmetric lithium battery prepared using the electrolyte solution for lithium battery and the preparation method thereof and the implementation electrolyte solution 6 of lithium battery of the present invention, and fig. 7 is a cycle life diagram of a symmetric lithium battery prepared using the electrolyte solution for lithium battery and the preparation method thereof and the implementation electrolyte solution 7 of lithium battery of the present invention. As shown in the figure, under the condition of different proportions of non-aqueous organic solvents, n-hexylboronic acid R 2 The additive can still obviously prolong the cycle life of the lithium symmetrical battery.
Fig. 9 is a graph showing cycle performance of a full cell prepared using the electrolyte 1 for a lithium battery and the comparative electrolyte 1 of a lithium battery according to the present invention and a method for preparing the same. As shown in the figure, the cycle stability of the full battery assembled by using the electrolyte 1 is greatly improved, the capacity retention rate of 90.2% is still maintained after 150 cycles of cycle, and the specific capacity attenuation is slow.
Therefore, the electrolyte for the lithium battery, the preparation method thereof and the lithium battery can solve the problem of low charging and discharging times of the conventional lithium battery, and have the advantages of good cycling stability and slow specific capacity attenuation.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (10)
1. An electrolyte for a lithium battery, characterized in that: the lithium salt, the nonaqueous organic solvent and the additive are included, wherein the additive is alkyl boric acid, and the weight percentage content of the additive is 0.5-2.0 wt%;
the alkyl boric acid is one or a mixture of more of n-propyl boric acid, n-hexyl boric acid and n-octyl boric acid;
the structural formula of n-propylboronic acid is:
the structural formula of n-hexylboronic acid is:
the structural formula of n-octylboronic acid is:
2. the electrolyte for a lithium battery as claimed in claim 1, wherein: the concentration of the lithium salt is 1M, and the lithium salt is LiPF 6 、LiBF 4 、LiBOB、LiDFOB、LiSbF 6 、LiAsF 6 、LiN(SO 2 CF 3 ) 2 、LiN(SO 2 C 2 F 5 ) 2 、LiC(SO 2 CF 3 ) 3 Or LiN (SO) 2 F) 2 One or a mixture of several of them.
3. The electrolyte for a lithium battery as claimed in claim 1, wherein: the non-aqueous organic solvent is a mixture of cyclic carbonate and chain carbonate, and the volume ratio of the cyclic carbonate to the chain carbonate is 3:7-7: 3; the cyclic carbonate is one or a mixture of more of ethylene carbonate, propylene carbonate or butylene carbonate, and the chain carbonate is one or a mixture of more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate or propyl methyl carbonate.
4. A method of preparing an electrolyte for a lithium battery as claimed in any one of claims 1 to 3, characterized by comprising the steps of:
s1, in a glove box, H 2 O<0.1ppm，O 2 <0.1ppm, weighing a proper amount of lithium salt, and dissolving the lithium salt in a nonaqueous organic solution, wherein the concentration of the lithium salt is 1M, so as to obtain a matrix electrolyte;
and S2, adding 0.5-2.0 wt% of additive into the matrix electrolyte, and uniformly stirring to obtain the electrolyte for the lithium battery.
5. A lithium battery comprising the electrolyte for a lithium battery prepared according to claim 4, characterized in that: comprises a battery shell, a positive electrode, a negative electrode, a diaphragm and electrolyte which are positioned in the battery shell.
6. A lithium battery as claimed in claim 5, characterized in that: the positive electrode comprises a positive electrode current collector and a positive electrode material positioned on the positive electrode current collector, wherein the positive electrode material comprises a positive electrode active material.
7. A lithium battery as claimed in claim 6, characterized in that: the positive active material is LiCoO 2 、LiNiO 2 、LiMn 2 O 4 、LiCo 1-y M y O 2 、LiNi 1-y M y O 2 、LiMn 2-y M y O 4 And LiNi x Co y Mn z M 1-x-y-z O 2 One or a mixture of several of them; wherein M is one or a mixture of more of Fe, Co, Ni, Mn, Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V or Ti, y is more than or equal to 0 and less than or equal to 1, x is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, and x + y + z is less than or equal to 1.
8. A lithium battery as claimed in claim 6, characterized in that: the positive active material is LiFe 1-x M x PO 4 Wherein M is one or a mixture of more of Mn, Mg, Co, Ni, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V or Ti, and x is more than or equal to 0 and less than 1.
9. A lithium battery as claimed in claim 5, characterized in that: the negative electrode comprises a negative electrode current collector and a negative electrode material positioned on the negative electrode current collector, wherein the negative electrode material is one or a mixture of more of graphite, hard carbon, soft carbon, a silicon-carbon composite material, a silicon-oxygen-carbon composite material, metal lithium and an alloy of the metal lithium.
10. A lithium battery as claimed in claim 5, characterized in that: the diaphragm is one or more of polyolefin porous membrane, non-woven fabric, fiber coating, ceramic coating and inorganic solid electrolyte coating.
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| CN116430257A (en) * | 2023-06-15 | 2023-07-14 | 四川新能源汽车创新中心有限公司 | Method for representing electrical performance of lithium battery and application thereof |
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| CN116430257A (en) * | 2023-06-15 | 2023-07-14 | 四川新能源汽车创新中心有限公司 | Method for representing electrical performance of lithium battery and application thereof |
| CN116430257B (en) * | 2023-06-15 | 2023-09-19 | 四川新能源汽车创新中心有限公司 | Method for representing electrical performance of lithium battery and application thereof |
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