CN113839006B - Lithium ion battery anode slurry and lithium ion battery - Google Patents
Lithium ion battery anode slurry and lithium ion battery Download PDFInfo
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0416—Methods of deposition of the material involving impregnation with a solution, dispersion, paste or dry powder
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present disclosure relates to a lithium ion battery positive electrode slurry comprising a positive electrode active material and a positive electrode material additive comprising Li 2 C 2 O 4 And Ni x O, wherein x is more than or equal to 0.67 and less than or equal to 1. The positive electrode slurry can realize Li under the condition of lower voltage 2 C 2 O 4 The decomposition of the lithium ion battery is completed, the lithium ion battery is supplemented to the negative electrode, and the irreversible structural change of the positive electrode active material under the condition of high charging voltage is avoided, so that the stability and the cycle performance of the battery are improved.
Description
Technical Field
The application relates to the technical field of lithium ion batteries, in particular to lithium ion battery anode slurry and a lithium ion battery.
Background
Document "Lithium Oxalate as Capacity and Cycle-Life Enhancer in LNMO/Graphite and LNMO/SiG Full Cells" reports Li 2 C 2 O 4 The material is decomposed at about 4.7V, li 2 C 2 O 4 Li generated during decomposition + Can migrate to the negative electrode and supplement active lithium consumed by the formation of the negative electrode SEI film. But Li is 2 C 2 O 4 The decomposition voltage of (2) is as high as 4.7V, which is only suitable for high-voltage lithium ion battery systems, such as LiNi 0.5 Mn 1.5 O 2 (operating voltage 4.7-4.8V). For most positive electrode materials, the decomposition voltage value is far higher than the charge cutoff voltage of the positive electrode materials, and particularly for ternary materials, the higher the charge voltage is, the larger the irreversible change of the structure is, and the structural stability and the cycle performance of the ternary materials are seriously affected.
Disclosure of Invention
The purpose of the present disclosure is to provide a lithium ion battery positive electrode slurry to further improve the structural stability and cycle performance of a lithium ion battery.
For the purpose ofTo achieve the above object, a first aspect of the present disclosure provides a positive electrode slurry for a lithium ion battery, the positive electrode slurry including a positive electrode active material and a positive electrode material additive, the positive electrode material additive including Li 2 C 2 O 4 And Ni x O, wherein x is more than or equal to 0.67 and less than or equal to 1.
Optionally, the Ni x O is selected from Ni 2 O 3 、Ni 0.8 One of O and NiO, preferably Ni 0.8 O。
Alternatively, li 2 C 2 O 4 The diameter of the Ni is 50nm-20 mu m x O has a diameter of 50nm to 5. Mu.m.
Alternatively, li 2 C 2 O 4 Is 100-500nm in diameter, the Ni x O has a diameter of 50-200nm.
Alternatively, li based on the total mass of the positive electrode material additive 2 C 2 O 4 10-95wt% of the Ni x The mass fraction of O is 5-90wt%.
Alternatively, li based on the total mass of the positive electrode material additive 2 C 2 O 4 40-50wt% of the Ni x The mass fraction of O is 20-60wt%.
Optionally, the mass ratio of the positive electrode active material to the positive electrode material additive is 10-95:5-90, preferably 65-95:5-35.
A second aspect of the present disclosure provides a lithium ion battery, including a positive electrode and a negative electrode, the positive electrode including a current collector and a positive electrode slurry coated on the current collector, the positive electrode slurry being the positive electrode slurry described above.
Optionally, the lithium ion battery is a nickel cobalt lithium manganate battery or a spinel lithium manganate battery, and the positive electrode material additive contains Li 2 C 2 O 4 The mass fraction of (C) is 70-85wt%.
Optionally, the lithium ion battery is a lithium iron phosphate battery, and Li in the positive electrode material additive 2 C 2 O 4 Is 10-50wt%.
Through the technical scheme, the disclosure provides the lithium ion battery anode slurry, and the anode slurry can realize Li under the condition of lower voltage 2 C 2 O 4 The decomposition of the lithium ion battery is completed, the lithium ion battery is supplemented to the negative electrode, and the irreversible structural change of the positive electrode active material under the condition of high charging voltage is avoided, so that the stability and the cycle performance of the battery are improved.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Detailed Description
The following describes specific embodiments of the present disclosure in detail. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
A first aspect of the present disclosure provides a lithium ion battery positive electrode slurry comprising a positive electrode active material and a positive electrode material additive comprising Li 2 C 2 O 4 And Ni x O, wherein x is more than or equal to 0.67 and less than or equal to 1.
The inventors of the present disclosure have found through a large number of experiments that Ni x O has conductivity capable of catalyzing Li 2 C 2 O 4 Decompose to make Li 2 C 2 O 4 The decomposition voltage of (2) is reduced to 4.6V or less. The NixO-Li is subjected to 2 C 2 O 4 The material is used as a positive electrode additive, can realize Li under the condition of lower voltage 2 C 2 O 4 Is decomposed. The additive is suitable for Li 2 C 2 O 4 、LiCoO 2 、LiMn 2 O 4 And the cathode material systems such as NCM and the like are decomposed under the condition of low voltage of 4.5V to complete lithium supplementation of the cathode, so that irreversible structural change of the cathode active material under the condition of continuous high charging voltage is avoided, and the stability and the cycle performance of the battery are improved.
According to the first aspect of the disclosure, different nickel metal oxides correspond to different physicochemical properties, such as conductivity, oxygen vacancy sites, catalytic properties, etc. of the material, and will therefore lead toResulting in different catalytic decomposition properties. Ni of the present disclosure x O may be selected from Ni 2 O 3 、Ni 0.8 One of O and NiO, preferably Ni 0.8 O。
According to a first aspect of the present disclosure, li 2 C 2 O 4 May have a diameter of 50nm to 20. Mu.m, the Ni x O may have a diameter of 50nm to 5. Mu.m. Preferably Li 2 C 2 O 4 Can be 100-500nm in diameter, the Ni x The diameter of O may preferably be 50-200nm.
Wherein Li is 2 C 2 O 4 As an active material for supplying lithium ions, li having a proper diameter is required to be decomposed by a catalyst 2 C 2 O 4 The catalyst is beneficial to decomposition when contacted with the catalyst and does not affect specific capacity. Ni (Ni) x O is used as a catalyst, ni with proper diameter x O can be combined with Li 2 C 2 O 4 The particles are fully contacted, thereby being beneficial to Li 2 C 2 O 4 The decomposition of the particles supplies lithium.
According to a first aspect of the present disclosure, ni x O is a catalyst, li 2 C 2 O 4 Can decompose to provide lithium ions, and is an active material for providing lithium in the composite material. Li (Li) 2 C 2 O 4 At a lower level of (2), the catalyst content is high, which is favorable for Li 2 C 2 O 4 Can be decomposed to obtain a composite material with a low decomposition voltage, but Li 2 C 2 O 4 The lower content of the active material can lead to lower specific capacity of the positive electrode material additive, and the lithium supplementing effect of the positive electrode material additive is affected; when Li 2 C 2 O 4 At higher levels, the catalyst content is low, which is detrimental to Li 2 C 2 O 4 The decomposition voltage of the obtained composite material is higher, and the high decomposition voltage can cause irreversible change of the structure of the positive electrode active material, thereby influencing the structural stability and the cycle performance of the positive electrode active material. Li of the present disclosure 2 C 2 O 4 And Ni x The mass fraction of O is to be taken to be within a proper range, and in the present disclosure, the positive electrode is addedBased on the total mass of the additive, li 2 C 2 O 4 May be 10-95wt%, the Ni x The mass fraction of O may be 5-90wt%. Preferably Li 2 C 2 O 4 May be 40-50wt%, the Ni x The mass fraction of O may be 20-60wt%. Ni in this range x O can ensure that the decomposition voltage of the positive electrode material additive is not higher than 4.6V, and can not seriously affect the positive electrode active material, li 2 C 2 O 4 The content of the composite material can lead the composite material to have higher specific capacity, and the lithium supplementing effect of the composite material serving as the positive electrode additive is not influenced.
The preparation method of the lithium ion battery anode material additive is not limited, and a physical mixing method and a chemical in-situ synthesis method can be adopted. Ni can be mixed by physical mixing x O powder and Li 2 C 2 O 4 The lithium ion battery anode material additive is prepared by physically mixing the powder, and the mixing method can be ball milling, sand milling and the like. When adopting a chemical in-situ synthesis method, ni can be used as a catalyst x Adding O powder and soluble lithium salt into water, stirring, adding soluble oxalate solution to obtain Li 2 C 2 O 4 And precipitating to obtain the lithium ion battery anode material additive. Wherein the soluble lithium salt is selected from LiCl, liOH, liNO 3 And Li (lithium) 2 SO 4 The soluble oxalate is selected from K 2 C 2 O 4 、Na 2 C 2 O 4 And H 2 C 2 O 4 One or more of the following.
According to the first aspect of the present disclosure, the mass ratio of the positive electrode active material to the positive electrode material additive may be 10 to 95:5-90, preferably 65-95%:5-35%.
A second aspect of the present disclosure provides a lithium ion battery, including a positive electrode and a negative electrode, the positive electrode including a current collector and a positive electrode slurry coated on the current collector, the positive electrode slurry being the positive electrode slurry described above.
Li of the present disclosure 2 C 2 O 4 Does not decompose during the first charge, but only decomposes to release CO when the battery is overcharged 2 The gas is used for improving the internal gas pressure of the battery, starting the safety protection device in advance and starting the explosion-proof valve, so that the thermal runaway of the positive electrode material during overcharging can be prevented, and the overcharging safety of the battery is improved.
According to a second aspect of the disclosure, when the lithium ion battery is a nickel cobalt lithium manganate battery or a spinel lithium manganate battery, the positive electrode material additive comprises Li 2 C 2 O 4 May be 70-85wt%. When the lithium ion battery is a lithium iron phosphate battery, li in the positive electrode material additive 2 C 2 O 4 May be 10 to 50wt%.
The present disclosure is further illustrated in detail by the following examples. The starting materials used in the examples are all available commercially.
Example 1
50 parts by weight of Ni with a diameter of 200nm 2 O 3 Powder and 50 parts by weight of Li having a diameter of 100nm 2 C 2 O 4 Placing the powder in a stirred ball mill, adding ethanol, mixing and grinding for 1h by a wet method, and placing the obtained slurry in a 60 ℃ oven for drying to obtain the lithium ion battery anode material additive of the embodiment.
Example 2
The preparation method of the positive electrode material additive for lithium ion batteries of this embodiment is the same as that of embodiment 1, except that the positive electrode material additive for lithium ion batteries of this embodiment uses Ni 2 O 3 Powder is replaced by Ni 0.8 O powder.
Example 3
The preparation method of the positive electrode material additive for lithium ion batteries of this embodiment is the same as that of embodiment 1, except that the positive electrode material additive for lithium ion batteries of this embodiment uses Ni 2 O 3 The powder is replaced by NiO powder.
Example 4
60 parts by weight of Ni with a diameter of 200nm 0.8 O powder and 40 parts by weight of straightLi with diameter of 100nm 2 C 2 O 4 Placing the powder in a stirred ball mill, adding ethanol, mixing and grinding for 1h by a wet method, and placing the obtained slurry in a 60 ℃ oven for drying to obtain the lithium ion battery anode material additive of the embodiment.
Example 5
20 parts by weight of Ni with a diameter of 200nm 0.8 O powder and 80 parts by weight of Li having a diameter of 100nm 2 C 2 O 4 Placing the powder in a stirred ball mill, adding ethanol, mixing and grinding for 1h by a wet method, and placing the obtained slurry in a 60 ℃ oven for drying to obtain the lithium ion battery anode material additive of the embodiment.
Example 6
20 parts by weight of Ni with a diameter of 200nm 0.8 O powder and 80 parts by weight of Li having a diameter of 10 μm 2 C 2 O 4 Placing the powder in a stirred ball mill, adding ethanol, mixing and grinding for 1h by a wet method, and placing the obtained slurry in a 60 ℃ oven for drying to obtain the lithium ion battery anode material additive of the embodiment.
Example 7
50 parts by weight of Ni with a diameter of 200nm 0.8 O powder and 50 parts by weight of Li having a diameter of 10 μm 2 C 2 O 4 Placing the powder in a stirred ball mill, adding ethanol, mixing and grinding for 1h by a wet method, and placing the obtained slurry in a 60 ℃ oven for drying to obtain the lithium ion battery anode material additive of the embodiment.
Comparative example 1
50 parts by weight of conductive carbon black powder with a diameter of 100nm and 50 parts by weight of Li with a diameter of 100nm 2 C 2 O 4 Placing the powder in a stirred ball mill, adding ethanol, mixing and grinding for 1h by a wet method, and placing the obtained slurry in a 60 ℃ oven for drying to prepare the lithium ion battery anode material additive of the comparative example.
Comparative example 2
Li with a diameter of 100nm 2 C 2 O 4 The powder was used as an additive for the positive electrode material of the lithium ion battery of this comparative example.
Test example 1 decomposition Performance test
The positive electrode material additives of the lithium ion batteries of examples 1-7 and comparative examples 1-2 are used as positive electrode materials, acetylene black is used as a conductive agent, polyvinylidene fluoride is used as a binder, N-methylpyrrolidone is used as a dispersing agent, and the mass ratio is 85:10:5:50 ratio will positive electrode material: acetylene black: polyvinylidene fluoride: uniformly mixing N-methyl pyrrolidone, coating on an aluminum foil, then placing in a 120 ℃ oven for vacuum drying for 24 hours, tabletting, and rolling to prepare a positive plate; 1mol/L LiPF (lithium ion battery) with lithium metal sheet as negative electrode and cellgard 2400 polypropylene porous membrane as diaphragm 6 The mixed solution of ethylene carbonate and dimethyl carbonate (volume ratio is=1:1) is electrolyte; the assembly of the test cells was completed in an argon-filled glove box to obtain the cell samples of the present test examples.
And (3) lithium is removed from each battery sample at a charging state, namely a working electrode, the charging current density is 0.1 ℃, and the battery sample is charged to a cut-off voltage to stop operation, so that the first-time charging specific capacity is calculated. After the first lithium removal, the battery is set to be in a discharge state, namely the working electrode is embedded with lithium, the discharge current density is 0.1C, the discharge is finished when the discharge reaches the cut-off voltage of 3V, and the first discharge specific capacity is calculated. The specific results are shown in Table 1, wherein:
first charge specific capacity (mAh/g) =first delithiation capacity/mass of active substance
Specific first discharge capacity (mAh/g) =first lithium intercalation capacity/mass of active material
TABLE 1
As can be seen from table 1: the battery samples prepared in examples 1-7 have a significantly reduced first charge voltage platform and a significantly increased first charge specific capacity, so that the lithium ion battery positive electrode slurry of the present disclosure can realize Li under a lower voltage condition 2 C 2 O 4 Is decomposed. Specifically, it can be seen that Ni is a specific charge capacity for the first time in combination with the decomposition voltages of examples 1 to 3 0.8 The catalytic performance of O is obviously better than that of Ni 2 O 3 And NiO; as can be seen by comparing examples 2, 4 and 5, ni x The higher the O content, the lower the decomposition voltage; comparison of examples 3, 5, 6 and 7 shows that an excessively large particle size of lithium oxalate affects the decomposition performance, resulting in incomplete decomposition.
Test example 2 lithium supplementing Performance test
The lithium ion battery positive electrode material additives of examples 1-3 and comparative examples 1-2 were combined with LiCoO 2 The mixture was mixed at a mass ratio of 10:90 to prepare a positive electrode material of the test example. Graphite is used as a negative electrode material, styrene-butadiene rubber is used as a binder, sodium carboxymethylcellulose is used as a thickener, water is used as a dispersing agent, and the mass ratio of graphite is as follows: styrene-butadiene rubber: sodium carboxymethyl cellulose: water = 100:3:2:50, coating the mixture on a copper foil, then placing the copper foil in a 90 ℃ oven for drying for 24 hours, tabletting and rolling to prepare the negative plate. 1mol/L LiPF using cellgard 2400 polypropylene porous membrane as membrane 6 The mixed solution of ethylene carbonate and dimethyl carbonate (volume ratio is=1:1) is electrolyte; the assembly of the test cells was completed in an argon-filled glove box to obtain the cell samples of the present test examples.
And (3) lithium is removed from each battery sample at the charging state, namely the working electrode, the charging current density is 0.1 ℃, and the battery sample is charged to the cut-off voltage of 4.6V to stop operation, so that the first-time charging specific capacity is calculated. After the first lithium removal, the battery is set to be in a discharge state, namely the working electrode is embedded with lithium, the discharge current density is 0.1C, the discharge is finished when the discharge reaches the cut-off voltage of 3V, and the first discharge specific capacity is calculated. The specific results are shown in Table 2.
TABLE 2
| Battery sample | First charge specific capacity mAh/g | Specific capacity mAh/g of first discharge |
| Example 1 | 238.7 | 215.1 |
| Example 2 | 248.6 | 221.5 |
| Example 3 | 229.6 | 204.8 |
| Comparative example 1 | 221.2 | 201.9 |
| Comparative example 2 | 217.3 | 198.4 |
As can be seen from table 2: since the additive in examples 1-3 is Li 2 C 2 O 4 /Ni x O, the first charge specific capacity and the first discharge specific capacity of which are significantly higher than those of comparative examples 1 and 2, wherein the additive in example 2 is Li 2 C 2 O 4 /Ni 0.8 O, the decomposition performance is optimal at low voltage, so the specific charge-discharge capacity is optimal. In comparison with comparative examples 1 and 2, only Li was introduced 2 C 2 O 4 /C、Li 2 C 2 O 4 The lithium oxalate has high decomposition voltage, and after the lithium oxalate is compounded with the lithium cobaltate, the lithium oxalate is not decomposed basically, and the lithium supplementing effect cannot be realized. Therefore, the lithium ion battery anode slurry can realize lithium supplementation under low voltage and realize the function of supplementing active lithium
Test example 3 overcharge protection Performance test
Will be solidExample 5 lithium ion Battery cathode Material additive and LiNi 1/3 Co 1/3 Mn 1/3 O 2 Mixing according to a mass ratio of 10:90 to obtain a positive electrode material 1, wherein the positive electrode material is LiNi 1/3 Co 1/3 Mn 1/3 O 2 As the positive electrode material 2. Graphite is used as a negative electrode material, styrene-butadiene rubber is used as a binder, sodium carboxymethylcellulose is used as a thickener, water is used as a dispersing agent, and the mass ratio of graphite is as follows: styrene-butadiene rubber: sodium carboxymethyl cellulose: water = 100:3:2:50, coating the mixture on a copper foil, then placing the copper foil in a 90 ℃ oven for drying for 24 hours, tabletting and rolling to prepare the negative plate. 1mol/L LiPF using cellgard 2400 polypropylene porous membrane as membrane 6 The mixed solution of ethylene carbonate and dimethyl carbonate (volume ratio is=1:1) is electrolyte; the assembly of the test cells was completed in a glove box filled with argon, to obtain cell sample 1 and cell sample 2 of the present test example.
Battery sample 1 and battery sample 2 were charged to 4.3V at 0.1C magnification, left to stand for 5min, and then charged to 5V at 1C magnification, and the state of the battery was observed. The test results are shown in Table 3.
TABLE 3 Table 3
| Battery numbering | 5V battery status |
| Battery sample 1 | The explosion-proof valve is opened and is not exploded |
| Cell sample 2 | The explosion-proof valve is opened to cause fire and explosion |
As can be seen from table 3: in the process of charging the battery sample 1 to 5V, the explosion-proof valve is opened earlier, and the battery is not exploded; although the explosion-proof valve of the battery sample 2 is opened in the charging process, the opening time is later, the internal short circuit of the battery is serious, and the thermal runaway cannot be prevented, so that the battery still fires and explodes. The result shows that the safe functional positive electrode additive material can prevent the thermal runaway of the positive electrode material, so that the battery has higher overcharge safety.
The preferred embodiments of the present disclosure have been described in detail above, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (10)
1. A positive electrode slurry for a lithium ion battery is characterized in that the positive electrode slurry comprises a positive electrode active material and a positive electrode additive, wherein the positive electrode additive comprises Li 2 C 2 O 4 And Ni x O, wherein x is more than or equal to 0.67 and less than or equal to 1;
Li 2 C 2 O 4 the diameter of the Ni is 50nm-20 mu m x O has a diameter of 50nm-5 μm;
li based on the total mass of the positive electrode additive 2 C 2 O 4 10-95wt% of the Ni x The mass fraction of O is 5-90wt%.
2. The lithium ion battery positive electrode slurry of claim 1, wherein the Ni x O is selected from Ni 2 O 3 、Ni 0.8 O and NiO.
3. The lithium ion battery positive electrode slurry according to claim 2, wherein the Ni x O is Ni 0.8 O。
4. The lithium ion battery positive electrode slurry according to claim 1, wherein Li 2 C 2 O 4 Is 100-500nm in diameter, the Ni x O has a diameter of 50-200nm.
5. The lithium ion battery positive electrode slurry according to claim 1, wherein Li is based on the total mass of the positive electrode additive 2 C 2 O 4 40-50wt% of the Ni x The mass fraction of O is 20-60wt%.
6. The lithium ion battery positive electrode slurry according to claim 1, wherein a mass ratio of the positive electrode active material and the positive electrode additive is 10 to 95:5-90.
7. The lithium ion battery positive electrode slurry according to claim 6, wherein the mass ratio of the positive electrode active material and the positive electrode additive is 65-95:5-35.
8. A lithium ion battery comprising a positive electrode and a negative electrode, the positive electrode comprising a current collector and a positive electrode slurry coated on the current collector, wherein the positive electrode slurry is the positive electrode slurry of any one of claims 1 to 7.
9. The lithium ion battery of claim 8, wherein the lithium ion battery is a nickel cobalt lithium manganate battery or a spinel lithium manganate battery, li in the positive electrode material additive 2 C 2 O 4 The mass fraction of (C) is 70-85wt%.
10. The lithium ion of claim 8The lithium ion battery is a lithium iron phosphate battery, and Li in the positive electrode material additive 2 C 2 O 4 Is 10-50wt%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2006027925A2 (en) * | 2004-09-06 | 2006-03-16 | Nissan Motor Co., Ltd. | Positive electrode material for non-aqueous electrolyte lithium-ion secondary battery and method for production thereof |
| CN103137976A (en) * | 2011-11-25 | 2013-06-05 | 中国科学院物理研究所 | Nanometer composite material and preparation method thereof, positive electrode material and battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006027925A2 (en) * | 2004-09-06 | 2006-03-16 | Nissan Motor Co., Ltd. | Positive electrode material for non-aqueous electrolyte lithium-ion secondary battery and method for production thereof |
| CN103137976A (en) * | 2011-11-25 | 2013-06-05 | 中国科学院物理研究所 | Nanometer composite material and preparation method thereof, positive electrode material and battery |
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