CN114525407A - Method for efficiently leaching lithium from high-aluminum waste lithium iron phosphate battery positive electrode material - Google Patents
Method for efficiently leaching lithium from high-aluminum waste lithium iron phosphate battery positive electrode material Download PDFInfo
- Publication number
- CN114525407A CN114525407A CN202210021380.1A CN202210021380A CN114525407A CN 114525407 A CN114525407 A CN 114525407A CN 202210021380 A CN202210021380 A CN 202210021380A CN 114525407 A CN114525407 A CN 114525407A
- Authority
- CN
- China
- Prior art keywords
- lithium
- leaching
- positive electrode
- iron phosphate
- electrode material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
- C22B7/007—Wet processes by acid leaching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B15/00—Other processes for the manufacture of iron from iron compounds
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/0015—Obtaining aluminium by wet processes
- C22B21/0023—Obtaining aluminium by wet processes from waste materials
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/10—Obtaining alkali metals
- C22B26/12—Obtaining lithium
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
Abstract
The invention discloses a method for efficiently leaching lithium from a high-aluminum waste lithium iron phosphate battery positive electrode material, which comprises the following steps of: (1) taking a positive electrode material of the high-aluminum waste lithium iron phosphate battery, taking organic acid as a leaching agent and taking hydrogen peroxide as a reducing agent; (2) stirring the system in the step (1) at normal temperature to react to obtain a reaction solution; (3) and (3) filtering the reaction solution obtained in the step (2) to obtain a filtrate containing lithium, phosphorus, iron and aluminum elements. The pH range of the organic acid used in the invention is 1.5-4, lithium ions are selectively leached at room temperature, and the leaching rate of other impurity ions is low; compared with the prior art, the invention has less consumption of organic acid under the condition that the leaching rate of lithium ions is approximately the same; the leaching rate is more than 90% at normal temperature, heating is not needed, the energy consumption required by the reaction is greatly reduced, and the industrial production cost is low. The invention has simple process and low cost, and is easier for industrial production.
Description
Technical Field
The invention relates to the field of lithium battery material recovery methods, in particular to a method for efficiently leaching lithium from a high-aluminum waste lithium iron phosphate battery positive electrode material.
Background
A lithium iron phosphate battery is a lithium iron phosphate (LiFePO)4) And carbon as a cathode material and a cathode material. The lithium iron phosphate battery has the advantages of high energy density, long cycle life, small self-discharge rate, no memory effect, low manufacturing cost, no toxicity, high capacity, excellent cycle performance and the like, and is widely applied to electric vehicles and energy storage industries.
Data of the Chinese automobile technical research center shows that the accumulated retirement amount of the power battery in China is about 20 ten thousand tons in 2020, and the accumulated retirement amount in 2025 is estimated to be about 78 ten thousand tons. If the charging amount of the power battery of the current electric automobile is 50-70 kWh, the corresponding retired power battery reaches 30GWH under the assumption that 60 ten thousand electric automobiles are retired. With the growth of millions of new electric vehicles each year in the future, the retirement pressure of power batteries is conceivable. In summary, lithium batteries are produced in large quantities in China, and the consumption of the lithium batteries is relatively high, so that although people pay attention to recycling of the lithium batteries, the recycling and resource regeneration of the lithium batteries are not paid enough attention. Nowadays, the lithium battery is generally treated with other common garbage according to the treatment mode. Meanwhile, people do not know the recovery mode of the lithium battery, so that the recovered lithium battery cannot be effectively applied.
The patent with application number 201310630608.8 discloses a method for preparing a nickel cobalt lithium manganate positive electrode material by taking waste lithium ion batteries as raw materials, which mainly comprises the steps of dissolving positive electrode slurry in a citric acid solution with a molar concentration of 0.75-1.25mol/L, adding a reducing agent hydrogen peroxide solution, dissolving and filtering, and then preparing the nickel cobalt lithium manganate positive electrode material through a series of steps, the patent with application number 201710251713.9 discloses a method for recovering a positive electrode material precursor and lithium carbonate from lithium ion battery positive electrode waste materials, leaching the lithium ion battery positive electrode waste materials by using a volatile leaching agent containing the reducing agent under a heating condition, separating to obtain a leaching solution and leaching residues, wherein the preferable acid concentration of the leaching agent is 2-4mol/L, and then obtaining high-purity lithium carbonate solid through a series of steps.
In the prior art, valuable elements in the waste lithium ion batteries are recovered mainly by acid-base leaching, but the leaching rate of lithium ions is high, and meanwhile, the leaching rate of other metal ions is also high, and lithium ions are not selectively leached, so that the waste is caused by the overlarge usage amount of a leaching agent. Meanwhile, in the prior art, valuable elements are generally leached under the heating condition, so that the leaching energy consumption is increased, and the leaching cost is increased.
Disclosure of Invention
The invention aims to provide a method for efficiently leaching lithium from a high-aluminum waste lithium iron phosphate battery positive electrode material, so as to solve the problem that lithium and other metals in a lithium battery are difficult to selectively recover in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for efficiently leaching lithium from a high-aluminum waste lithium iron phosphate battery positive electrode material comprises the following steps:
(1) taking a high-aluminum waste lithium iron phosphate battery positive electrode material as a raw material, taking an organic acid as a leaching agent, adding the leaching agent into the raw material, and adding an oxidant, wherein the pH range of the organic acid as the leaching agent is 1.5-4, and the solid-to-liquid ratio of the raw material to the leaching agent is 1: 10-1: 50;
(2) stirring the system in the step (1) at normal temperature to react to obtain a reaction solution;
(3) and (3) filtering the reaction solution obtained in the step (2), wherein the obtained filtrate is a solution containing lithium, phosphorus, iron and aluminum elements.
Further, in the step (1), the organic acid used as the leaching agent is one or more of citric acid, malic acid and tartaric acid in any proportion.
Further, the oxidant in the step (1) is hydrogen peroxide.
Furthermore, the mass fraction of hydrogen peroxide is 5-30%, and the volume ratio of hydrogen peroxide to organic acid used as an extracting agent is 1: 20-1: 100.
Further, in the step (2), the system in the step (1) is stirred and reacted for 15min to 150min at the normal temperature and at the stirring speed of 100 rpm to 500 rpm.
Further, the leaching rate of lithium in the filtrate obtained in the step (3) is 90% or more.
The invention provides a method for efficiently leaching lithium from a high-aluminum waste lithium iron phosphate battery positive material, aiming at the waste lithium iron phosphate battery. The method comprises the steps of carrying out organic acid leaching on high-aluminum waste lithium iron phosphate battery positive electrode material powder (the pH range is 1.5-4) to obtain filtrate and filter residue, leaching more than 90% of lithium in the filtrate, and realizing efficient selective leaching of the lithium due to lower leaching rate of other valuable metals.
Most of the prior art is inorganic acid leaching, which causes environmental pollution, easily causes corrosion to equipment and has higher leaching rate to aluminum. Compared with the prior art, the organic acid used in the invention has little pollution to the environment and little corrosion to equipment, and simultaneously improves the leaching rate of lithium ions, and compared with the leaching of the organic acid by the inorganic acid, the leaching rate of aluminum can be reduced.
Compared with the prior art, the invention has the advantages that the pH range of the organic acid used in the invention is 1.5-4, the mass of the organic acid consumed for preparing the organic acid with the pH range of 1.5-4 is less than that of the organic acid with the preparation concentration of 0.5mol/L, the consumption of the organic acid can be greatly reduced, and the leaching cost is further reduced.
Compared with the prior art, the invention is leached under the normal temperature condition, and the energy consumption can be greatly reduced.
Compared with the prior art, the invention has the advantages of simple process, low cost and easy industrial production.
Drawings
Fig. 1 is a schematic flow chart of the process for efficiently leaching lithium from the cathode material of the high-aluminum waste lithium iron phosphate battery in the embodiment of the invention.
Detailed Description
The invention is further explained below with reference to fig. 1, in accordance with an embodiment.
Example 1
A method for efficiently leaching lithium from a high-aluminum waste lithium iron phosphate battery positive electrode material comprises the following steps:
(1) weighing 10g of high-aluminum waste lithium iron phosphate battery positive electrode material powder into a 250ml three-neck flask, adding 100ml of citric acid with the pH =1.5, and dropwise adding 4ml of hydrogen peroxide with the mass fraction of 30%;
(2) placing the three-neck flask obtained in the step 1 at room temperature, and reacting for 60min at the stirring speed of 300 rpm;
(3) after the reaction is finished, the reaction solution is filtered and washed, and the filtrate is solution containing lithium, phosphorus, iron and aluminum elements.
Measuring Li in the filtrate+The leaching rate of (1) is 90.03%, Fe2+/Fe3+The leaching rate of (1) is 2.3%, Al3+The leaching rate was 28.9%.
Example 2
A method for efficiently leaching lithium from a high-aluminum waste lithium iron phosphate battery positive electrode material comprises the following steps:
(1) weighing 10g of high-aluminum waste lithium iron phosphate battery positive electrode material powder into a 250ml three-neck flask, adding 100ml of citric acid with the pH =2, and dropwise adding 4ml of hydrogen peroxide with the mass fraction of 30%;
(2) placing the three-neck flask obtained in the step 1 at room temperature, and reacting for 60min at the stirring speed of 300 rpm;
(3) after the reaction is finished, the reaction solution is filtered and washed, and the filtrate is solution containing lithium, phosphorus, iron and aluminum elements.
Measuring Li in the filtrate+The leaching rate of (1) is 92.3%, Fe2+/Fe3+The leaching rate of (1) is 8.4%, Al3+The leaching rate of (A) was 35.3%.
Example 3
A method for efficiently leaching lithium from a high-aluminum waste lithium iron phosphate battery positive electrode material comprises the following steps:
(1) weighing 10g of high-aluminum waste lithium iron phosphate battery positive electrode material powder into a 250ml three-neck flask, adding 100ml of citric acid with the pH =2, and dropwise adding 10ml of hydrogen peroxide with the mass fraction of 30%;
(2) placing the three-neck flask obtained in the step 1 at room temperature, and reacting for 90min at the stirring speed of 300 rpm;
(3) after the reaction is finished, the reaction solution is filtered and washed, and the filtrate is solution containing lithium, phosphorus, iron and aluminum elements.
Measuring Li in the filtrate+The leaching rate of (2) was 91.5%, Fe2+/Fe3+The leaching rate of (1) was 12.3%, and Al was contained3+The leaching rate of (A) was 41.6%.
Example 4
A method for efficiently leaching lithium from a high-aluminum waste lithium iron phosphate battery positive electrode material comprises the following steps:
(1) weighing 5g of high-aluminum waste lithium iron phosphate battery positive electrode material powder into a 250ml three-neck flask, adding 100ml of citric acid with the pH =3, and dropwise adding 6ml of hydrogen peroxide with the mass fraction of 30%;
(2) placing the three-neck flask obtained in the step 1 at room temperature, and reacting for 90min at the stirring speed of 300 rpm;
(3) after the reaction is finished, the reaction solution is filtered and washed, and the filtrate is solution containing lithium, phosphorus, iron and aluminum elements.
Measuring Li in the filtrate+The leaching rate of (1) was 93.6%, Fe2+/Fe3+The leaching rate of (1) was 13.5%, Al3+The leaching rate of (D) was 39.9%.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements of the technical solution of the present invention made by the technical personnel in the field should fall into the protection scope of the present invention without departing from the design idea of the present invention, and the technical content of the present invention which is claimed is fully described in the claims.
Claims (6)
1. A method for efficiently leaching lithium from a high-aluminum waste lithium iron phosphate battery positive electrode material is characterized by comprising the following steps:
(1) taking a high-aluminum waste lithium iron phosphate battery positive electrode material as a raw material, selecting an organic acid as a leaching agent, adding the leaching agent into the raw material, and adding an oxidant, wherein the pH range of the organic acid as the leaching agent is 1.5-4, and the solid-to-liquid ratio of the raw material to the leaching agent is 1: 10-1: 50;
(2) stirring the system in the step (1) at normal temperature to react to obtain a reaction solution;
(3) and (3) filtering the reaction solution obtained in the step (2), wherein the obtained filtrate is a solution containing lithium, phosphorus, iron and aluminum elements.
2. The method for efficiently leaching lithium from the high-aluminum waste lithium iron phosphate battery positive electrode material according to claim 1, wherein in the step (1), the organic acid used as the leaching agent is one or more of citric acid, malic acid, tartaric acid, formic acid and acetic acid in any proportion.
3. The method for efficiently leaching lithium from the high-aluminum waste lithium iron phosphate battery positive electrode material according to claim 1, wherein the oxidant in the step (1) is hydrogen peroxide.
4. The method for efficiently leaching lithium from the positive electrode material of the high-aluminum waste lithium iron phosphate battery as claimed in claim 3, wherein the mass fraction of hydrogen peroxide is 5-30%, and the volume ratio of hydrogen peroxide to organic acid serving as a leaching agent is 1: 20-1: 100.
5. The method for efficiently leaching lithium from the high-aluminum waste lithium iron phosphate battery positive electrode material according to claim 1, wherein in the step (2), the system in the step (1) is stirred and reacted at a stirring speed of 100-500 rpm for 15-150 min at normal temperature.
6. The method for efficiently leaching lithium from the cathode material of the high-aluminum waste lithium iron phosphate battery as claimed in claim 1, wherein the leaching rate of lithium in the filtrate obtained in the step (3) is more than 90%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210021380.1A CN114525407A (en) | 2022-01-10 | 2022-01-10 | Method for efficiently leaching lithium from high-aluminum waste lithium iron phosphate battery positive electrode material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210021380.1A CN114525407A (en) | 2022-01-10 | 2022-01-10 | Method for efficiently leaching lithium from high-aluminum waste lithium iron phosphate battery positive electrode material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114525407A true CN114525407A (en) | 2022-05-24 |
Family
ID=81620124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210021380.1A Pending CN114525407A (en) | 2022-01-10 | 2022-01-10 | Method for efficiently leaching lithium from high-aluminum waste lithium iron phosphate battery positive electrode material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114525407A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804049A (en) * | 2022-06-13 | 2022-07-29 | 中南大学 | Method for recovering and obtaining high-purity iron phosphate from waste lithium iron phosphate batteries |
| CN114959305A (en) * | 2022-05-30 | 2022-08-30 | 玉溪师范学院 | Method for leaching lithium from clay ionic lithium resource in organic acid |
| KR102593241B1 (en) * | 2023-04-14 | 2023-10-24 | 주식회사 오성아이케이 | Method of recovering lithium from iron phosphate-based battery |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160043450A1 (en) * | 2014-08-06 | 2016-02-11 | Steven E. Sloop | Recycling positive-electrode material of a lithium-ion battery |
| CN107739830A (en) * | 2017-10-16 | 2018-02-27 | 福州大学 | A kind of recovery method of positive material of waste lithium iron phosphate |
| US20190161357A1 (en) * | 2016-08-26 | 2019-05-30 | Hunan Jinyuan New Materials Co., Ltd. | Method for preparing lithium carbonate from lithium iron phosphate battery scraps and lithium carbonate thereof |
| CN111370800A (en) * | 2020-03-03 | 2020-07-03 | 湖南雅城新材料有限公司 | Method for recovering waste lithium iron phosphate anode material |
| CN112310499A (en) * | 2019-07-31 | 2021-02-02 | 中国科学院过程工程研究所 | Recovery method of waste lithium iron phosphate material and obtained recovery liquid |
| CN113816353A (en) * | 2021-09-14 | 2021-12-21 | 中南大学 | Method for removing aluminum in acid leaching solution of waste lithium iron phosphate battery through iron-aluminum coprecipitation |
-
2022
- 2022-01-10 CN CN202210021380.1A patent/CN114525407A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160043450A1 (en) * | 2014-08-06 | 2016-02-11 | Steven E. Sloop | Recycling positive-electrode material of a lithium-ion battery |
| US20190161357A1 (en) * | 2016-08-26 | 2019-05-30 | Hunan Jinyuan New Materials Co., Ltd. | Method for preparing lithium carbonate from lithium iron phosphate battery scraps and lithium carbonate thereof |
| CN107739830A (en) * | 2017-10-16 | 2018-02-27 | 福州大学 | A kind of recovery method of positive material of waste lithium iron phosphate |
| CN112310499A (en) * | 2019-07-31 | 2021-02-02 | 中国科学院过程工程研究所 | Recovery method of waste lithium iron phosphate material and obtained recovery liquid |
| CN111370800A (en) * | 2020-03-03 | 2020-07-03 | 湖南雅城新材料有限公司 | Method for recovering waste lithium iron phosphate anode material |
| CN113816353A (en) * | 2021-09-14 | 2021-12-21 | 中南大学 | Method for removing aluminum in acid leaching solution of waste lithium iron phosphate battery through iron-aluminum coprecipitation |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959305A (en) * | 2022-05-30 | 2022-08-30 | 玉溪师范学院 | Method for leaching lithium from clay ionic lithium resource in organic acid |
| CN114804049A (en) * | 2022-06-13 | 2022-07-29 | 中南大学 | Method for recovering and obtaining high-purity iron phosphate from waste lithium iron phosphate batteries |
| CN114804049B (en) * | 2022-06-13 | 2023-12-12 | 中南大学 | Method for recovering high-purity ferric phosphate from lithium iron phosphate waste batteries |
| KR102593241B1 (en) * | 2023-04-14 | 2023-10-24 | 주식회사 오성아이케이 | Method of recovering lithium from iron phosphate-based battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112331949B (en) | Method for recovering phosphorus, iron and lithium from waste lithium iron phosphate batteries | |
| Natarajan et al. | Burgeoning prospects of spent lithium‐ion batteries in multifarious applications | |
| EP3907182B1 (en) | Method for producing lithium iron phosphate precursor by using retired lithium iron phosphate battery as raw material | |
| CN107267759B (en) | A kind of comprehensive recovering process of anode material for lithium-ion batteries | |
| CN114525407A (en) | Method for efficiently leaching lithium from high-aluminum waste lithium iron phosphate battery positive electrode material | |
| CN113501510A (en) | Method for recycling and regenerating anode material of waste lithium iron phosphate battery | |
| CN103280610B (en) | A kind of positive pole waste tablet from ferric phosphate lithium cell recovery method | |
| CN102390863B (en) | Method for regenerating lithium titanate serving as anode material of waste lithium ion battery | |
| CN110343864B (en) | Method for recovering lithium and cobalt in waste electrode material by microwave roasting assistance | |
| CN103384002B (en) | A kind of method that utilization nickel cobalt slag prepares electronic ternary material precursor | |
| CN111082043A (en) | Recycling method of waste nickel cobalt lithium manganate ternary battery positive electrode material | |
| CN108913873A (en) | A method of recycling high added value metal from waste and old nickel cobalt manganese lithium ion battery | |
| CN103035977A (en) | Method for separating and recovering lithium from waste lithium ion battery | |
| CN109119711B (en) | Method for preparing high-voltage positive electrode material by adopting waste lithium cobalt oxide battery | |
| CN111072023A (en) | Method for recycling graphite from scrapped lithium ion battery | |
| CN106992329B (en) | A kind of resource utilization reuse method of waste and old lithium ion battery lithium iron phosphate positive material | |
| CN115432681B (en) | Regeneration process of waste lithium iron phosphate battery anode material | |
| CN106276842A (en) | Method by the LiFePO4 reclaiming in waste and old lithium ion battery | |
| CN115832378B (en) | Preparation method and application of electrolyte key material | |
| CN111977627A (en) | Method for recycling lithium iron phosphate anode material of lithium ion battery | |
| CN106992328A (en) | The waste lithium iron phosphate positive electrode method that recycling is recycled in Hawkins cell | |
| CN114249313A (en) | Method for recovering battery-grade iron phosphate from waste lithium iron phosphate powder | |
| CN115621598A (en) | Method for recycling and regenerating waste NCM523 type ternary lithium battery positive electrode material | |
| CN114134329B (en) | Method for recycling valuable metals in positive electrode material by utilizing aluminum foil of current collector of waste lithium ion battery | |
| CN114540640A (en) | Lithium battery recycling method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liu Zhiqi Inventor after: Chen Anqi Inventor after: Zhou Ziyuan Inventor after: Yan Dongqiang Inventor after: Li Na Inventor after: Zhao Pengcheng Inventor before: Zhou Ziyuan Inventor before: Chen Anqi Inventor before: Liu Zhiqi Inventor before: Yan Dongqiang Inventor before: Li Na Inventor before: Zhao Pengcheng |