CN113839006A - Lithium ion battery anode slurry and lithium ion battery - Google Patents

Lithium ion battery anode slurry and lithium ion battery Download PDF

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CN113839006A
CN113839006A CN202010591296.4A CN202010591296A CN113839006A CN 113839006 A CN113839006 A CN 113839006A CN 202010591296 A CN202010591296 A CN 202010591296A CN 113839006 A CN113839006 A CN 113839006A
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positive electrode
lithium ion
ion battery
lithium
slurry
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CN113839006B (en
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李娜
焦晓朋
李世彩
韩晓燕
乔璐璐
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Shenzhen BYD Auto R&D Co Ltd
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Shenzhen BYD Auto R&D Co Ltd
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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
    • H01M4/13—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
    • 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
    • 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
    • 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
    • H01M4/0416—Methods of deposition of the material involving impregnation with a solution, dispersion, paste or dry powder
    • 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
    • H01M4/36—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
    • 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
    • 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
    • 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
    • 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 positive electrode slurry for a lithium ion battery, the positive electrode slurry comprising a positive electrode active material and a positive electrode material additive, the positive electrode material additive comprising Li2C2O4And NixO, wherein x is more than or equal to 0.67 and less than or equal to 1. The anode slurry can realize Li under the condition of lower voltage2C2O4The decomposition of the lithium ion battery completes the lithium supplement to the negative electrode, and avoids the irreversible structural change of the positive active material under the condition of high charging voltage, thereby improving the stability and the cycle performance of the battery.

Description

Lithium ion battery anode slurry and lithium ion battery
Technical Field
The application relates to the technical field of lithium ion batteries, in particular to a lithium ion battery anode slurry and a lithium ion battery.
Background
Article of literature "Li report on Li by Lithium oxide as Capacity and Cycle-Life Enhancer in LNMO/Graphite and LNMO/SiG Full Cells2C2O4The material is decomposed at about 4.7V, Li2C2O4Li produced upon decomposition+Can migrate to the negative electrode and replenish the active lithium consumed by the negative electrode SEI film formation. But Li2C2O4The decomposition voltage of the lithium ion battery is up to 4.7V, and the lithium ion battery is only suitable for high-voltage lithium ion battery systems, such as LiNi0.5Mn1.5O2(working voltage 4.7-4.8V). For most positive electrode materials, the decomposition voltage value is far higher than the charge cut-off voltage, 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 material are seriously influenced.
Disclosure of Invention
The purpose of the present disclosure is to provide a lithium ion battery cathode slurry to further improve the structural stability and cycle performance of a lithium ion battery.
In order to 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 including Li2C2O4And NixO, wherein x is more than or equal to 0.67 and less than or equal to 1.
Alternatively, the NixO is selected from Ni2O3、Ni0.8One of O and NiO, preferably Ni0.8O。
Alternatively, Li2C2O4Has a diameter of 50nm to 20 μm, said NixThe diameter of O is 50nm-5 μm.
Alternatively, Li2C2O4Has a diameter of 100-500nm, the NixThe diameter of O is 50-200 nm.
Optionally, Li is based on the total mass of the positive electrode material additive2C2O4Is 10-95 wt%, the NixThe mass fraction of O is 5-90 wt%.
Optionally, adding with the cathode materialBased on the total mass of additives, Li2C2O4Is 40-50 wt%, the NixThe mass fraction of O is 20-60 wt%.
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.
The second aspect of the present disclosure provides a lithium ion battery, which includes a positive electrode and a negative electrode, wherein the positive electrode includes a current collector and a positive electrode slurry coated on the current collector, and the positive electrode slurry is the above positive electrode slurry.
Optionally, the lithium ion battery is a nickel cobalt lithium manganate battery or a spinel lithium manganate battery, and Li in the positive electrode material additive2C2O4The mass fraction of (B) is 70-85 wt%.
Optionally, the lithium ion battery is a lithium iron phosphate battery, and Li in the positive electrode material additive2C2O4The mass fraction of (B) is 10-50 wt%.
By the technical scheme, the disclosure provides the lithium ion battery anode slurry which can realize Li under the condition of lower voltage2C2O4The decomposition of the lithium ion battery completes the lithium supplement to the negative electrode, and avoids the irreversible structural change of the positive active material under the condition of high charging voltage, thereby improving the stability and the cycle performance of the battery.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present disclosure. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
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 Li2C2O4And NixO, 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 NixO has an electrical conductivity capable of catalyzing Li2C2O4Decompose to thereby cause Li2C2O4The decomposition voltage of (a) is reduced to 4.6V or less. The NixO-Li is added2C2O4The material is used as an additive of the positive electrode, and Li can be realized under the condition of lower voltage2C2O4Decomposition of (3). The additive is suitable for Li2C2O4、LiCoO2、LiMn2O4And the positive electrode material systems such as NCM realize decomposition under the low voltage of 4.5V, complete lithium supplement to the negative electrode, and avoid irreversible structural change of a positive electrode active substance under the condition of continuous high charging voltage, thereby improving the stability and the cycle performance of the battery.
According to a first aspect of the present disclosure, different nickel metal oxides correspond to different physicochemical properties, such as conductivity, oxygen vacancy sites, catalytic performance of the material, etc., which will result in different catalytic decomposition performance. Ni of the present disclosurexO may be selected from Ni2O3、Ni0.8One of O and NiO, preferably Ni0.8O。
According to a first aspect of the present disclosure, Li2C2O4May be 50nm to 20 μm in diameter, the NixThe diameter of O may be 50nm to 5 μm. Preferably, Li2C2O4May be 100-500nm, the NixThe diameter of O may preferably be 50 to 200 nm.
Wherein Li2C2O4As an active material for supplying lithium ions, Li having an appropriate diameter, which is decomposed by a catalyst, is required2C2O4The catalyst is easy to decompose when in contact with the catalyst and the specific capacity is not influenced. NixO as catalyst, Ni of suitable diameterxO may react with Li2C2O4The particles are in full contact, thereby facilitating Li2C2O4The decomposition of the particles provides lithium.
First party according to the present disclosureSurface, NixO as a catalyst, Li2C2O4Can be decomposed to provide lithium ions, and is an active material for providing lithium in the composite material. Li2C2O4When the content of (A) is low, the content of the catalyst is high, which is favorable for Li2C2O4Can give a composite material having a low decomposition voltage, but Li2C2O4The low content of the active material can cause the low specific capacity of the positive electrode material additive, and influence the lithium supplement effect of the positive electrode material additive; when Li is present2C2O4At higher contents, the catalyst content is low, which is disadvantageous for Li2C2O4The decomposition voltage of the obtained composite material is high, and the high decomposition voltage can cause the irreversible change of the structure of the positive electrode active material, so that the structural stability and the cycle performance of the positive electrode active material are influenced. Thus Li of the present disclosure2C2O4And NixThe mass fraction of O is within a proper range, and Li is taken as the reference of the total mass of the positive electrode additive in the disclosure2C2O4May be 10 to 95 wt%, the NixThe mass fraction of O may be 5 to 90 wt%. Preferably, Li2C2O4May be 40-50 wt%, the NixThe mass fraction of O may be 20 to 60 wt%. Ni in this rangexO can ensure that the decomposition voltage of the additive of the anode material is not higher than 4.6V, and does not have serious influence on the anode active substance, and Li2C2O4The content of the lithium ion battery anode material can ensure that the composite material has higher specific capacity, and the lithium supplement effect of the composite material as the anode additive cannot be influenced.
The preparation method of the lithium ion battery cathode material additive is not limited, and a physical mixing method or a chemical in-situ synthesis method can be adopted. When a physical mixing method is adopted, Ni can be mixedxO powder and Li2C2O4The lithium ion battery anode material additive disclosed by the invention is prepared by physically mixing the powder, and the mixing method can be ball milling, sanding and the like. Adopts a chemical in-situ synthesis methodIn the process, Ni may be addedxAdding O powder and soluble lithium salt into water, and adding soluble oxalate solution while stirring to obtain Li2C2O4Precipitating to obtain the lithium ion battery cathode material additive. Wherein the soluble lithium salt is selected from LiCl, LiOH and LiNO3And Li2SO4Wherein the soluble oxalate salt is selected from K2C2O4、Na2C2O4And H2C2O4One or more of (a).
According to the first aspect of the present disclosure, the mass ratio of the positive electrode active material and the positive electrode material additive may be 10 to 95: 5-90, preferably 65-95%: 5 to 35 percent.
The second aspect of the present disclosure provides a lithium ion battery, which includes a positive electrode and a negative electrode, wherein the positive electrode includes a current collector and a positive electrode slurry coated on the current collector, and the positive electrode slurry is the above positive electrode slurry.
Li of the present disclosure2C2O4Does not decompose during the first charging process, but decomposes to release CO when the battery is overcharged2The gas is used for improving the internal gas pressure of the battery, starting the safety protection device in advance, starting the explosion-proof valve, preventing thermal runaway of the anode material during overcharge, and improving the overcharge safety of the battery.
According to the second aspect of the disclosure, when the lithium ion battery is a nickel cobalt lithium manganate battery or a spinel lithium manganate battery, Li in the positive electrode material additive2C2O4The mass fraction of (B) may be 70-85 wt%. When the lithium ion battery is a lithium iron phosphate battery, Li in the positive electrode material additive2C2O4May be in the range of 10 to 50 wt%.
The present disclosure is further illustrated by the following examples. The raw materials used in the examples are all available from commercial sources.
Example 1
50 parts by weight of Ni having a diameter of 200nm2O3Powder and 50 wt%Fraction of Li having a diameter of 100nm2C2O4And (3) putting the powder into a stirring ball mill, adding ethanol, mixing and grinding for 1h by a wet method, and putting the obtained slurry into a 60 ℃ oven for drying to obtain the lithium ion battery anode material additive.
Example 2
The preparation method of the additive for the positive electrode material of the lithium ion battery in this embodiment is the same as that in embodiment 1, except that Ni is added to the additive for the positive electrode material of the lithium ion battery in this embodiment2O3Powder is replaced by Ni0.8And (3) O powder.
Example 3
The preparation method of the additive for the positive electrode material of the lithium ion battery in this embodiment is the same as that in embodiment 1, except that Ni is added to the additive for the positive electrode material of the lithium ion battery in this embodiment2O3The powder was replaced with NiO powder.
Example 4
60 parts by weight of Ni having a diameter of 200nm0.8O powder and 40 parts by weight of Li having a diameter of 100nm2C2O4And (3) putting the powder into a stirring ball mill, adding ethanol, mixing and grinding for 1h by a wet method, and putting the obtained slurry into a 60 ℃ oven for drying to obtain the lithium ion battery anode material additive.
Example 5
20 parts by weight of Ni having a diameter of 200nm0.8O powder and 80 parts by weight of Li having a diameter of 100nm2C2O4And (3) putting the powder into a stirring ball mill, adding ethanol, mixing and grinding for 1h by a wet method, and putting the obtained slurry into a 60 ℃ oven for drying to obtain the lithium ion battery anode material additive.
Example 6
20 parts by weight of Ni having a diameter of 200nm0.8O powder and 80 parts by weight of Li having a diameter of 10 μm2C2O4And (3) putting the powder into a stirring ball mill, adding ethanol, mixing and grinding for 1h by a wet method, and putting the obtained slurry into a 60 ℃ oven for drying to obtain the lithium ion battery anode material additive.
Example 7
50 parts by weight of Ni having a diameter of 200nm0.8O powder and 50 parts by weight of Li having a diameter of 10 μm2C2O4And (3) putting the powder into a stirring ball mill, adding ethanol, mixing and grinding for 1h by a wet method, and putting the obtained slurry into a 60 ℃ oven for drying to obtain the lithium ion battery anode material additive.
Comparative example 1
50 parts by weight of conductive carbon black powder with the diameter of 100nm and 50 parts by weight of Li with the diameter of 100nm2C2O4And (3) putting the powder into a stirring ball mill, adding ethanol, mixing and grinding for 1h by a wet method, and putting the obtained slurry into a 60 ℃ oven for drying to obtain the lithium ion battery anode material additive of the comparative example.
Comparative example 2
Mixing Li with a diameter of 100nm2C2O4The powder is used as the additive of the lithium ion battery anode material of the comparative example.
Test example 1 decomposition Performance test
Taking the lithium ion battery positive electrode material additives of examples 1-7 and comparative examples 1-2 as positive electrode materials, acetylene black as a conductive agent, polyvinylidene fluoride as a binder, and N-methyl pyrrolidone as a dispersing agent, wherein the mass ratio of the positive electrode materials is 85: 10: 5: ratio of 50 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 and cutting to prepare a positive plate; 1mol/L LiPF with a metal lithium sheet as a cathode and a celgard2400 polypropylene porous membrane as a diaphragm6A mixed solution (volume ratio is 1:1) of ethylene carbonate and dimethyl carbonate is used as an electrolyte; the assembly of the test cell was completed in a glove box filled with argon gas to obtain a cell sample of this test example.
And setting each battery sample to be in a charging state, namely, removing lithium from the working electrode, wherein the charging current density is 0.1C, stopping operation when the charging is carried out to cut-off voltage, and calculating the specific capacity of the first charging. After the first lithium removal is finished, the battery is set to be in a discharging state, namely the working electrode is embedded with lithium, the discharging current density is 0.1C, discharging is finished when the discharging is finished until the cut-off voltage is 3V, and the first discharging specific capacity is calculated. Specific results are shown in table 1, wherein:
specific first charge capacity (mAh/g) being the first delithiation capacity/mass of active material
Specific first discharge capacity (mAh/g) being the first lithium insertion capacity/mass of active material
TABLE 1
Figure BDA0002555643510000071
As can be seen from table 1: the first charge voltage platform of the battery samples prepared in the embodiments 1 to 7 is obviously reduced, and the first charge specific capacity is obviously increased, so that the lithium ion battery anode slurry disclosed by the invention can realize Li under a lower voltage condition2C2O4Decomposition of (3). Specifically, Ni can be seen by combining the decomposition voltage and the first charge specific capacity of examples 1 to 30.8The catalytic performance of O is obviously better than that of Ni2O3And NiO; comparison of examples 2, 4 and 5 shows that NixThe higher the O content, the lower the decomposition voltage; a comparison of examples 3, 5, 6 and 7 shows that an excessively large lithium oxalate particle size affects the decomposition performance, resulting in incomplete decomposition.
Test example 2 lithium supplement Performance test
The additives of the positive electrode materials for lithium ion batteries of examples 1 to 3 and comparative examples 1 to 2 were mixed with LiCoO2The mixture was mixed at a mass ratio of 10:90 to obtain a positive electrode material of this test example. Graphite is used as a negative electrode material, styrene butadiene rubber is used as a binder, sodium carboxymethylcellulose is used as a thickening agent, water is used as a dispersing agent, and the weight ratio of graphite: styrene-butadiene rubber: sodium carboxymethylcellulose: 100 parts of water: 3: 2: and (3) uniformly mixing the raw materials in a ratio of 50, coating the mixture on a copper foil, drying the copper foil in a 90 ℃ oven for 24 hours, tabletting, and rolling and cutting to prepare the negative plate. 1mol/L LiPF with celgard2400 polypropylene porous membrane as a diaphragm6A mixed solution (volume ratio is 1:1) of ethylene carbonate and dimethyl carbonate is used as an electrolyte; the assembly of the test cell was completed in a glove box filled with argon gas to obtain a cell sample of this test example.
And (3) setting each battery sample to be in a charging state, namely, removing lithium from the working electrode, stopping running when the charging current density is 0.1C and the charging is carried out until the cut-off voltage is 4.6V, and calculating the first charging specific capacity. After the first lithium removal is finished, the battery is set to be in a discharging state, namely the working electrode is embedded with lithium, the discharging current density is 0.1C, discharging is finished when the discharging is finished until the cut-off voltage is 3V, and the first discharging specific capacity is calculated. The specific results are shown in Table 2.
TABLE 2
Battery sample Specific capacity of first charge mAh/g Specific capacity of first discharge mAh/g
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 to 3 is Li2C2O4/NixO, 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 Li2C2O4/Ni0.8And O, the decomposition performance is optimal under low voltage, so that the charging and discharging specific capacity is optimal. Compared with comparative examples 1 and 2, only Li is introduced2C2O4/C、Li2C2O4So that the lithium oxalate has high decomposition voltage, and after being compounded with lithium cobaltate, the lithium oxalate is not decomposed basically, and the lithium supplement effect cannot be realized. Therefore, the lithium ion battery anode slurry disclosed by the invention can realize lithium supplement at low voltage and realize the effect of supplementing active lithium
Test example 3 overcharge resistance test
The lithium ion battery cathode material additive and LiNi in example 51/3Co1/3Mn1/3O2Mixed according to the mass ratio of 10:90 to be used as a positive electrode material 1, and LiNi is used1/3Co1/3Mn1/3O2As 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 thickening agent, water is used as a dispersing agent, and the weight ratio of graphite: styrene-butadiene rubber: sodium carboxymethylcellulose: 100 parts of water: 3: 2: and (3) uniformly mixing the raw materials in a ratio of 50, coating the mixture on a copper foil, drying the copper foil in a 90 ℃ oven for 24 hours, tabletting, and rolling and cutting to prepare the negative plate. 1mol/L LiPF with celgard2400 polypropylene porous membrane as a diaphragm6A mixed solution (volume ratio is 1:1) of ethylene carbonate and dimethyl carbonate is used as an electrolyte; the assembly of the test cells was completed in a glove box filled with argon gas, to obtain a cell sample 1 and a cell sample 2 of this test example.
The battery samples 1 and 2 were charged to 4.3V at 0.1C rate, left to stand for 5min and then charged to 5V at 1C rate, and the state of the battery was observed. The test results are shown in Table 3.
TABLE 3
Battery numbering 5V Battery State
Battery sample 1 Opening the explosion-proof valve without explosion
Battery sample 2 Opening of the explosion-proof valve and explosion in case of fire
As can be seen from table 3: in the process of charging the battery sample 1 to 5V, the explosion-proof valve is opened early, and the battery does not explode; although the explosion-proof valve of the battery sample 2 is opened in the charging process, the opening time is relatively late, 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 cathode additive material can prevent the thermal runaway of the cathode material, so that the battery has higher overcharge resistance safety.
The preferred embodiments of the present disclosure have been described in detail above, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. The positive electrode slurry of the lithium ion battery is characterized by comprising a positive electrode active material and a positive electrode additive, wherein the positive electrode additive comprises Li2C2O4And NixO, wherein x is more than or equal to 0.67 and less than or equal to 1.
2. The lithium ion battery cathode slurry of claim 1, wherein the Ni isxO is selected from Ni2O3、Ni0.8One of O and NiO, preferably Ni0.8O。
3. The lithium ion battery cathode slurry of claim 1, wherein Li2C2O4Has a diameter of 50nm to 20 μm, said NixThe diameter of O is 50nm-5 μm.
4. The lithium ion battery cathode slurry of claim 1, wherein Li2C2O4Has a diameter of 100-500nm, the NixThe diameter of O is 50-200 nm.
5. The lithium ion battery positive electrode slurry according to claim 1, wherein Li is based on the total mass of the positive electrode additive2C2O4Is 10-95 wt%, the NixThe mass fraction of O is 5-90 wt%.
6. The lithium ion battery positive electrode slurry according to claim 1, wherein Li is based on the total mass of the positive electrode additive2C2O4Is 40-50 wt%, the NixThe mass fraction of O is 20-60 wt%.
7. The lithium ion battery cathode slurry of claim 5, wherein the mass ratio of the cathode active material to the cathode additive is 10-95: 5-90, preferably 65-95: 5-35.
8. A lithium ion battery, which comprises a positive electrode and a negative electrode, wherein the positive electrode comprises a current collector and a positive electrode slurry coated on the current collector, and the positive electrode slurry is the positive electrode slurry in 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, and the positive electrode material additive comprises Li2C2O4The mass fraction of (B) is 70-85 wt%.
10. The lithium ion battery of claim 8, wherein the lithium ion battery is a lithium iron phosphate battery, and the positive electrode material additive comprises Li2C2O4The mass fraction of (B) is 10-50 wt%.
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