GB2619454A - Preparation method for and application of tellurium-doped lithium cobalt oxide precursor - Google Patents

Preparation method for and application of tellurium-doped lithium cobalt oxide precursor Download PDF

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GB2619454A
GB2619454A GB2314106.2A GB202314106A GB2619454A GB 2619454 A GB2619454 A GB 2619454A GB 202314106 A GB202314106 A GB 202314106A GB 2619454 A GB2619454 A GB 2619454A
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lithium
tellurium
lithium cobaltate
prepared
cobalt
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Yu Haijun
Xie Yinghao
Li Aixia
Zhang Xuemei
Li Changdong
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Hunan Brunp Recycling Technology Co Ltd
Guangdong Brunp Recycling Technology Co Ltd
Hunan Bangpu Automobile Circulation Co Ltd
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Hunan Brunp Recycling Technology Co Ltd
Guangdong Brunp Recycling Technology Co Ltd
Hunan Bangpu Automobile Circulation Co Ltd
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    • C—CHEMISTRY; METALLURGY
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    • C01B19/00—Selenium; Tellurium; Compounds thereof
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    • 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
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    • 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
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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Abstract

Disclosed in the present invention are a preparation method for and an application of a tellurium-doped lithium cobalt oxide precursor. A cobalt salt solution, a precipitant, and a complexing agent are added into a base solution for reaction, the precipitant being a mixed solution of tellurium dioxide dissolved in sodium hydroxide, and the base solution being a mixed solution of ammonia water and thiosulfate; and when the reaction material reaches a target particle size, the reaction material is aged, and solid-liquid separation is performed to obtain a lithium cobalt oxide precursor. According to the present invention, tellurium is reduced into tellurium anions by means of thiosulfate, cobalt telluride is generated, and a coprecipitate is formed with cobalt hydroxide, such that doping of tellurium in a precursor is achieved.

Description

METHOD FOR PREPARING TELLURIUM-DOPED LITHIUM COBALTATE
PRECURSOR AND USE THEREOF
FIELD
[00011 The present disclosure belongs to the technical field of lithium-ion batteries, and specifically relates to a method for preparing a tellurium-doped lithium cobaltate precursor and use thereof.
BACKGROUND
[00021 Among positive electrode materials for lithium-ion batteries, lithium cobaltate is widely used as it has high operating voltage and energy density and can be easily synthesized and charged/discharged rapidly. In recent years, with the further miniaturization and multi-functionalization of electronic products, higher requirements have been imposed to the energy density output by batteries, and conventional lithium cobaltates can no longer meet the requirements. Under the premise of ensuring safety and appropriate cycle performance, improving the energy density of lithium batteries is still a basic direction of small lithium batteries in the coming years.
[00031 The main ways to improve energy density include increasing the capacity of the electrode material and/or increasing the operating voltage of the battery, and increasing both the voltage and the capacity is currently the mainstream of the development of positive electrode materials for 3C lithium batteries. The operating voltage of the existing lithium-ion batteries is basically between 3.0 V and 4.3 V, and the capacity can be increased by about 20% for the lithium-ion battery with lithium cobaltate as the positive electrode material when charged to 4.5 V. However, due to the structure of lithium cobaltate itself, when the charge voltage exceeds 4.2V, the Li]_xCo02 de-intercalation coefficient x is > 0.5, leading to the collapse of the structure inside the material, which will cause problems such as poor charge-discharge cycle at high voltage and poor storage performance at high temperature.
[00041 In the related art is disclosed a high-voltage lithium cobaltate positive electrode material.
-I -
The product prepared from it can have a compacted density of 4.1-4.15 g/cm3, but its particle size distribution D50 is 17.0-19.0 pm, which belongs to the category of large particles in the lithium cobaltate industry. The rate performance of particles with such particle size still needs to be improved due to the long diffusion path of lithium ions. During charging and discharging, the volume change inside the large particles tends to cause micro-cracks in the material, resulting in a sharp decrease in the cycle performance. As most of lithium cobaltate materials currently existing on the market present mainly polycrystalline morphology with a compacted density of below 3.6 g/cm3, it is also an urgent task to increase the compacted density and thus increase the volumetric energy density of lithium cobaltate materials.
SUMMARY
[0005] The present disclosure aims to solve at least one of the above-mentioned technical problems existing in the prior art. For this reason, the present disclosure proposes a method for preparing a tellurium-doped lithium cohaltate precursor and use thereof.
[0006] According to an aspect of the present disclosure, a method for preparing a lithium cobaltate precursor is provided, comprising steps of: [0007] SI: adding a cobalt salt solution, a precipitant and a complexing agent into a base solution for reaction in an inert atmosphere to obtain a reaction material, wherein the precipitant is a mixed solution of tellurium dioxide dissolved in sodium hydroxide, and the base solution is a 20 mixed solution of ammonia water and thiosulfate; and [0008] S2: when the reaction material reaches a target particle size, subjecting the reaction material to aging and solid-liquid separation to obtain the lithium cobaltate precursor.
[0009] In some embodiments of the present disclosure, in step Si, the cobalt salt solution is selected from the group consisting of cobalt sulfate, cobalt nitrate, cobalt chloride and a mixture 25 thereof.
[0010] In some embodiments of the present disclosure, in step Si, the cobalt salt solution has a concentration of 1.0-2.0 mol/L.
[0011] In some embodiments of the present disclosure, in step Si, a concentration of sodium hydroxide in the precipitant is 2.0-4.0 mol/L, and an amount of tellurium dioxide added is 1-10% of the molar quantity of sodium hydroxide.
[9012] In some embodiments of the present disclosure, in step S, the complexing agent is 6.0-I 2.0 mol/L ammonia water.
[9013] In some embodiments of the present disclosure, in step S I, the base solution has a pH of I 0-I I, an ammonia concentration of 5-10 g/L, and a thiosulfate concentration of 0.1-3.0 mol/L.
[9014] In some embodiments of the present disclosure, in step Si, the reaction is carried out at a temperature of 55-65°C, a pH of 10-11 and an ammonia concentration of 5-10 g/L.
[9015] In some embodiments of the present disclosure, in step Si, the reaction is carried out in a reactor, and the volume of the base solution is 8-12% of the volume of the reactor.
[9016] In some embodiments of the present disclosure, in step Si, the reaction is carried out at a stirring speed of 200-500 r/min.
[9017] In some embodiments of the present disclosure, in step S2, the aging is carried out for 24-48 h. [9018] In some embodiments of the present disclosure, in step S2, the target particle size distribution D50 of the reaction material is 2.0-5.0 um.
[9019] In some embodiments of the present disclosure, step S2 further comprises water-washing and drying the solid phase obtained by the solid-liquid separation, and the drying is optionally carried out at a temperature of 100-120°C for 4-6 h. [9029] The present disclosure also provides use of the lithium cobaltate precursor described above in the preparation of lithium cobaltate. In some embodiments of the present disclosure, the method for preparing lithium cohaltate comprises mixing the lithium cohaltate precursor with a lithium source and calcining in an atmosphere containing oxygen. By the doping of tellurium as well as reduction synthesis and low-temperature sintering of the precursor, a long-cycle, highly compacted monocrystalline lithium cobalt positive electrode material is obtained.
[9021] In some embodiments of the present disclosure, the lithium source is selected from the group consisting of lithium carbonate, lithium hydroxide and a mixture thereof [0022] In some embodiments of the present disclosure, the calcination is carried out at a temperature of 700-800°C. Further, the calcination is carried out for 12-18 h. [0023] In some embodiments of the present disclosure, the molar ratio of cobalt element in the lithium cobaltate precursor to lithium element in the lithium source is I: (I.0-1.2).
[0024] The present disclosure also provides use of the lithium cobaltate precursor prepared by the method described above in the preparation of a positive electrode material for lithium-ion battery.
[0025] The present disclosure also provides use of the lithium cobaltate precursor prepared by the method described above in the preparation of a lithium-ion battery.
[0026] According to a preferred embodiment of the present disclosure, the present disclosure has at least the following beneficial effects: [0027] 1. In the present disclosure, a tellurium-doped cobalt hydroxide is obtained by co-precipitation of a cobalt salt, a complexing agent and a precipitant followed by doping of tellurium. Since tellurate is soluble, it is difficult to co-precipitate with cobalt. In the present disclosure, tellurium is reduced to tellurium anion with thiosulfate to generate cobalt telluride, which is then co-precipitated with cobalt hydroxide, thereby achieving the doping of tellurium in the precursor. The reaction equations involved are as follows: [0028] 4Co2+-F4Te032-+352032-+60H-=4CoTe,[ +65042-+3 H20: [0029] Co2++20H-=Co(OH)2,1,.
[0030] 2. The oxidation of cobalt will change the crystalline phase, attenuate the whiskers and make the material loose and porous. In the present disclosure, however, the reaction is always in a reducing atmosphere during co-precipitation, which avoids the oxidation of cobalt. Therefore, the produced precursor will be denser, and the lithium cobaltate material produced by subsequent sintering will have a higher compacted density.
[0031] 3. After the calcination of the lithium cobaltate precursor and the lithium source, a tellurium-doped lithium cobaltate positive electrode material is obtained. Tellurium is doped to replace oxygen atoms in lithium cobaltate, and cobalt telluride is gradually oxidized in oxygen (CoTe+202=CoTeO4) during the subsequent sintering. In the form of anion, tellurium can help to -4 -further stabilize the crystal skeleton. Besides, since tellurium has a larger ionic radius, the interlayer spacing is further expanded, which improves the capacity of lithium and further improves the specific capacity of the material.
[00321 4. The difference between the doping of tellurium and the doping of other elements lies in that as a non-metallic element, it can form a stable anion group to exist stably, unlike sulfur and selenium in the same group that are extremely volatile after being oxidized at high temperature and make it difficult to remove impurities.
BRIEF DESCRIPTION OF DRAWINGS
[0033] The present disclosure is further described belo n conjunction with the drawings and embodiments, in which: [0034] FIG. I shows an SEM image of the lithium cohaltate prepared in Example I of the present disclosure.
DETAILED DESCRIPTION
[0035] Hereinafter, the concept of the present disclosure and the technical effects produced by the present disclosure will be described clearly and completely in conjunction with the embodiments, so as to frilly understand the purpose, features and effects of the present disclosure. It is apparent that the described embodiments are only a part of the embodiments of the present disclosure, rather than all of them. All the other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without any creative work fall into the scope of the present disclosure.
Example 1
[0036] In this example, a tellurium-doped lithium cohaltate positive electrode material was prepared, specifically as follows: [0037] Step 1. A cobalt sulphate solution with a concentration of 1.0 mol/L was prepared.
[0038] Step 2. A sodium hydroxide solution with a concentration of 2.0 mol/L was prepared as a precipitant, and tellurium dioxide was added at an amount of 1% of the molar quantity of sodium hydroxide to dissolve completely to obtain a mixed solution.
[9039] Step 3. Ammonia water with a concentration of 6.0 mol/L was prepared as a complexing agent.
[9049] Step 4. A base solution was added into a reactor and nitrogen was introduced. The volume of the base solution accounted for 12% of the volume of the reactor, and the base solution was controlled to have a pH of 11 and an ammonia concentration of 10 g/L. Then sodium thiosulfate was added to make the concentration of sodium thiosulfate in the base solution to he 0.1 mol/L.
[9041] Step 5. The cobalt sulphate solution prepared in step 1, the mixed solution prepared in step 2 and the ammonia water prepared in step 3 were added into the reactor in a co-current manner for reaction. The reactor was controlled to have a stirring speed of 200 r/min, a pH of 11, a temperature of 55°C and an ammonia concentration of 10 g/L.
[0042] Step 6. When the 1350 of the material in the reactor was detected to reach 2.0 tim, the 15 feeding was stopped. Then aging was carried out for 24 h. [0043] Step 7. The material in the reactor was subjected to solid-liquid separatation to obtain a precipitate, which was then washed with pure water and dried at 100°C for 6 h to obtain a lithium cobaltate precursor material.
[9044] Step 8. The precursor material obtained in step 7 was mixed with lithium carbonate at a molar ratio of cobalt element to lithium element of 1:1 and calcined in an oxygen atmosphere at a temperature of 700°C for 18 h before crushing, sieving and removing iron. Then a tellurium-doped lithium cobaltate positive electrode material was obtained.
[9045] FIG. 1 shows an SEM image of the lithium cobaltate prepared in this example, from which it can be seen that the material had a very dense bulk structure.
Example 2
[0046] In this example, a tellurium-doped lithium cobaltate positive electrode material was prepared, specifically as follows: [9047] Step 1. A cobalt nitrate solution with a concentration of 1.5 mol/L was prepared. -6 -
[0048] Step 2. A sodium hydroxide solution with a concentration of 3.0 moUL was prepared as a precipitant, and tellurium dioxide was added at an amount of 5% of the molar quantity of sodium hydroxide to dissolve completely to obtain a mixed solution.
[00491 Step 3. Ammonia water with a concentration of 9.0 mol/L was prepared as a complexing agent.
[0050] Step 4. A base solution was added into a reactor and nitrogen was introduced. The volume of the base solution accounted for 10% of the volume of the reactor, and the base solution was controlled to have a pH of 10.5 and an ammonia concentration of 8 g/L. Then sodium thiosulfate was added to make the concentration of sodium thiosulfate in the base solution to he 1.5 mol/L.
[0051] Step 5. The cobalt nitrate solution prepared in step 1, the mixed solution prepared in step 2 and the ammonia water prepared in step 3 were added into the reactor in a co-current manner for reaction. The reactor was controlled to have a stirring speed of 350 r/min, a pH of 10.5, a temperature of 58°C and an ammonia concentration of 8 g/L.
[0052] Step 6. When the D50 of the material in the reactor was detected to reach 3.5 ttm, the feeding was stopped. Then aging was carried out for 36 h. [0053] Step 7. The material in the reactor was subjected to solid-liquid separatation to obtain a precipitate, which was then washed with pure water and dried at 110°C for 5 h to obtain a lithium cobaltate precursor material.
[0054] Step 8. The precursor material obtained in step 7 was mixed with lithium hydroxide at a molar ratio of cobalt element to lithium element of I: I.1 and calcined in an oxygen atmosphere at a temperature of 750°C for IS h before crushing, sieving and removing iron. Then a tellurium-doped lithium cobaltate positive electrode material was obtained.
Example 3
[0055] In this example, a tellurium-doped lithium cobaltate positive electrode material was prepared, specifically as follows: [0056] Step 1. A cobalt chloride solution with a concentration of 2.0 mol/L was prepared. [0057] Step 2. A sodium hydroxide solution with a concentration of 4.0 mol/L was prepared as -7 -a precipitant, and tellurium dioxide was added at an amount of 10% of the molar quantity of sodium hydroxide to dissolve completely to obtain a mixed solution.
[0058] Step 3. Ammonia water with a concentration of 12.0 mol/L was prepared as a complexing agent.
[9059] Step 4. A base solution was added into a reactor and argon was introduced. The volume of the base solution accounted for 12% of the volume of the reactor, and the base solution was controlled to have a pH of 10 and an ammonia concentration of 5 g/L. Then sodium thiosulfate was added to make the concentration of sodium thiosulfate in the base solution to he 3.0 mol/L.
[0060] Step 5. The cobalt chloride solution prepared in step 1, the mixed solution prepared in step 2 and the ammonia water prepared in step 3 were added into the reactor in a co-current manner for reaction. The reactor was controlled to have a stirring speed of 500 r/min, a pH of 10, a temperature of 65°C and an ammonia concentration of 5 g/L.
[0061] Step 6. When the D50 of the material in the reactor was detected to reach 5.0 gm, the feeding was stopped. Then aging was carried out for 48 h. [0062] Step 7. The material in the reactor was subjected to solid-liquid separatation to obtain a precipitate, which was then washed with pure water and dried at 120°C for 4 h to obtain a lithium cobaltate precursor material.
[0063] Step 8. The precursor material obtained in step 7 was mixed with lithium hydroxide at a molar ratio of cobalt element to lithium element of 1:1.2 and calcined in an oxygen atmosphere at a temperature of 800°C for 12 h before crushing, sieving and removing iron. Then a tellurium-doped lithium cobaltate positive electrode material was obtained.
Comparative Example 1 [0064] In this comparative example, a lithium cobaltate positive electrode material was prepared, which differs from Example 1 in that tellurium dioxide and sodium thiosulfate were not added, specifically as follows: [0065] In this example, a tellurium-doped lithium cobaltate positive electrode material was prepared, specifically as follows: [0066] Step 1. A cobalt sulphate solution with a concentration of 1.0 mol/L was prepared. -s -
[0067] Step 2. A sodium hydroxide solution with a concentration of 2.0 moUL was prepared as a precipitant.
[0068] Step 3. Ammonia water with a concentration of 6.0 mol/L was prepared as a complexing agent.
[0069] Step 4. A base solution was added into a reactor and nitrogen was introduced. The volume of the base solution accounted for 12% of the volume of the reactor, and the base solution was controlled to have a pH of II and an ammonia concentration of 10 g/L.
[0070] Step 5. The cobalt sulphate solution prepared in step 1, the sodium hydroxide solution prepared in step 2 and the ammonia water prepared in step 3 were added into the reactor in a co-current manner for reaction. The reactor was controlled to have a stirring speed of 200 r/min, a pH of 11, a temperature of 55°C and an ammonia concentration of 10 g/L.
[0071] Step 6. When the D50 of the material in the reactor was detected to reach 2.0 gm, the feeding was stopped. Then aging was carried out for 24 h. [0072] Step 7. The material in the reactor was subjected to solid-liquid separatation to obtain a precipitate, which was then washed with pure water and dried at 100°C for 6 h to obtain a lithium cobaltate precursor material.
[9073] Step 8. The precursor material obtained in step 7 was mixed with lithium carbonate at a molar ratio of cobalt element to lithium element of 1:1 and calcined in an oxygen atmosphere at a temperature of 700°C for 18 h before crushing, sieving and removing iron. Then a lithium cobaltate positive electrode material was obtained.
Comparative Example 2 [0074] In this example, a lithium cobaltate positive electrode material was prepared, which differs from Example 2 in that tellurium dioxide and sodium thiosulfate were not added, specifically as follows: [0075] Step 1. A cobalt nitrate solution with a concentration of 1.5 mol/L was prepared.
[0076] Step 2. A sodium hydroxide solution with a concentration of 3.0 mon was prepared as a precipitant.
[0077] Step 3. Ammonia water with a concentration of 9.0 mol/L was prepared as a complexing agent.
[9078] Step 4. A base solution was added into a reactor and nitrogen was introduced. The volume of the base solution accounted for 10% of the volume of the reactor, and the base solution was controlled to have a pH of 10.5 and an ammonia concentration of 8 g/L.
[9079] Step 5. The cobalt nitrate solution prepared in step 1, the mixed solution prepared in step 2 and the ammonia water prepared in step 3 were added into the reactor in a co-current manner for reaction. The reactor was controlled to have a stirring speed of 350 r/min, a pH of 10.5, a temperature of 58°C and an ammonia concentration of 8 g/L.
[0080] Step 6. When the D50 of the material in the reactor was detected to reach 3.5 gm, the feeding was stopped. Then aging was carried out for 36 h. [0081] Step 7. The material in the reactor was subjected to solid-liquid separatation to obtain a precipitate, which was then washed with pure water and dried at 110°C for 5 h to obtain a lithium cobaltate precursor material.
[0082] Step 8. The precursor material obtained in step 7 was mixed with lithium hydroxide at a molar ratio of cobalt element to lithium element of 1:1.1 and calcined in an oxygen atmosphere at a temperature of 750°C for 15 h before crushing, sieving and removing iron. Then a lithium cobaltate positive electrode material was obtained.
Comparative Example 3 [0083] In this example, a lithium cobaltate positive electrode material was prepared, which differs from Example 3 in that tellurium dioxide and sodium thiosulfate were not added, specifically as follows: [00841 Step 1. A cobalt chloride solution with a concentration of 2.0 moUL was prepared.
[0085] Step 2. A sodium hydroxide solution with a concentration of 4.0 molIL was prepared as a precipitant.
[9086] Step 3. Ammonia water with a concentration of 12.0 mol/L was prepared as a complexing agent.
-10 - [0087] Step 4. A base solution was added into a reactor and argon was introduced. The volume of the base solution accounted for 12% of the volume of the reactor, and the base solution was controlled to have a pH of 10 and an ammonia concentration of 5 g/L.
[00881 Step 5. The cobalt chloride solution prepared in step 1, the mixed solution prepared in step 2 and the ammonia water prepared in step 3 were added into the reactor in a co-current manner for reaction. The reactor was controlled to have a stirring speed of 500 r/min, a pH of 10, a temperature of 65°C and an ammonia concentration of 5 g/L.
[0089] Step 6. When the D50 of the material in the reactor was detected to reach 5.0 gm, the feeding was stopped. Then aging was carried out for 48 h. [0090] Step 7. The material in the reactor was subjected to solid-liquid separatation to obtain a precipitate, which was then washed with pure water and dried at 120°C for 4 h to obtain a lithium cobaltate precursor material.
[0091] Step 8. The precursor material obtained in step 7 was mixed with lithium hydroxide at a molar ratio of cobalt element to lithium element of 1:1.2 and calcined in an oxygen atmosphere at a temperature of 800°C for 12 h before crushing, sieving and removing iron. Then a lithium cobaltate positive electrode material was obtained.
Table 1. Detection of compacted density Compacted density g/cm3
Example I 4.23
Example 2 4.2I
Example 3 4.25
Comparative Example 1 3.81 Comparative Example 2 3.76 Comparative Example 3 3.83
Test Example
[00921 The lithium cobaltate materials obtained in the examples and comparative examples as an active material, acetylene black as a conductive agent and PVDF as a binder were mixed at a ratio of 92:4:4. A certain amount of organic solvent NMP was then added, stirred and coated on aluminium foil to prepare a positive electrode sheet. A metallic lithium sheet was used as a negative electrode. Then a CR2430 type button battery was prepared in a glove box filled with argon. The button cell was tested for electrical performance in the CT200 I A type test system of Lanhe, at 3.0 V-4.48 V, a current density of I C= I 80 mAh/g and a temperature of 25±1 °C. The test results are shown in Table 2.
Table 2. Electrochemical performance of batteries prepared from lithium cobaltate Discharge capacity at 0.1 C/4.48 V, Capacity retention rate after mAh/g 600 cycles at 0.1 C/4.48 V
Example 1 246.3 84%
Example 2 241.4 87%
Example 3 238.7 89%
Comparative 207.8 74%
Example 1
Comparative 208.1 77%
Example 2
Comparative 208.1 73%
Example 3
[0093] As can be seen from Table 2, the discharge capacity and cycle performance in the comparative examples are significantly lower than those in the examples. This is due to the fact that tellurium dioxide and sodium thiosulfate were added in the examples. The generated cobalt telluride was gradually oxidized during sintering. In the form of anion, tellurium can help to stabilize the crystal skeleton. Besides, since tellurium had a larger ionic radius, the interlayer spacing was expanded, which improved the capacity of lithium and further improved the specific -12 -capacity and cycle performance of the material. In addition, it can also be seen from Table 1 that the examples had higher compacted density and a higher volumetric energy density.
[0094] The embodiments of the present disclosure have been described in detail above in conjunction with the drawings. However, the present disclosure is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the purpose of the present disclosure within the scope of knowledge possessed by those of ordinary skill in the art. In addition, in the case of no conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other.

Claims (10)

  1. CLAIMS1. A method for preparing a lithium cobaltate precursor, comprising steps of: Si: adding a cobalt salt solution, a precipitant and a complexing agent into a base solution for reaction in an inert atmosphere to obtain a reaction material, wherein the precipitant is a mixed solution of tellurium dioxide dissolved in sodium hydroxide, and the base solution is a mixed solution of ammonia water and thiosulfate; and S2: when the reaction material reaches a target particle size, subjecting the reaction material to aging and solid-liquid separation to obtain the lithium cobaltate precursor.
  2. 2. The method according to claim 1, wherein in step Si, the cobalt salt solution is selected from the group consisting of cobalt sulfate, cobalt nitrate, cobalt chloride and a mixture thereof
  3. 3. The method according to claim 1, wherein in step S1, the cobalt salt solution has a concentration of 1.0-2.0 mol/L.
  4. 4. The method according to claim 1, wherein in step Si, a concentration of sodium hydroxide in the precipitant is 2.0-4.0 mol/L, and an amount of tellurium dioxide added is 1-10% of the molar quantity of sodium hydroxide.
  5. 5. The method according to claim 1, wherein in step Si, the complexing agent is 6.0-12.0 riml/L ammonia water.
  6. 6. The method according to claim I, wherein in step S 1, the base solution has a pH of 10-11, an ammonia concentration of 5-10 g/L, and a thiosulfate concentration of 0.1-3.0 mol/L.-14 -
  7. 7. The method according to claim 1, wherein in step S 1, the reaction is carried out at a temperature of 55-65°C, a pH of 10-11 and an ammonia concentration of 5-10 g/L.
  8. 8. Use of the lithium cobaltate precursor prepared by the method according to any one of claims I to 7 in the preparation of lithium cobaltate, a positive electrode material for lithium-ion battery or a lithium-ion battery.
  9. 9. The use according to claim 8, wherein the lithium cobaltate is prepared by mixing the lithium cobaltate precursor with a lithium source and calcining in an atmosphere containing oxygen, and the lithium source is selected from the group consisting of lithium carbonate, lithium hydroxide and a mixture thereof.
  10. 10. The use according to claim 8, wherein the lithium cobaltate is prepared by mixing the lithium cobaltate precursor with a lithium source and calcining in an atmosphere containing oxygen, and the calcination is carried out at a temperature of 700-800°C.-15 -
GB2314106.2A 2022-03-21 2022-11-14 Preparation method for and application of tellurium-doped lithium cobalt oxide precursor Pending GB2619454A (en)

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