Method for selectively extracting lithium from retired battery and application of method

Patent metadata

Field	Value
Publication number	US-2024039068-A1
Application number	US-202218260236-A
Country	US
Kind code	A1
Filing date	Jun 6, 2022
Priority date	Jul 22, 2021
Publication date	Feb 1, 2024
Grant date	—

Abstract

Disclosed are a method for selectively extracting lithium from a retired battery and an application of the method. According to the method, on the basis of an ion exchange effect between a divalent manganese ion and a lithium ion, a positive electrode material and a divalent manganese salt are mixed according to a certain proportion and prepared into a slurry, and the divalent manganese salt and the positive electrode material are fully mixed by means of a ball milling process, such that a lattice structure of the positive electrode material is effectively damaged, thereby reducing activation energy of exchange of the divalent manganese ion and the lithium ion and greatly reducing reaction energy required by a subsequence lithium extraction process. A mixed material after ball milling is roasted at a lower temperature such that the bivalent manganese in the manganese salt occupies a lithium position in a layered structure, and manganese-lithium replacement is directly performed to obtain a pure lithium-containing leaching solution. The present method greatly improves the leaching rate and selectivity of lithium. The present invention uses a mode of first performing ball-mill mixing and then performing roasting, and thus has low power consumption, high safety, good leaching rate and selectivity of lithium, and wide application prospects.

First claim

What is claimed is:

1 . A method for selectively extracting lithium from a retired battery, comprising the following steps:
S 1 : mixing a lithium battery positive electrode material and a manganous salt, adding a solvent to prepare a slurry, and ball milling the slurry to obtain a ball milled mixed material; wherein the lithium battery positive electrode material is at least one of lithium manganate, lithium cobaltate, lithium nickel cobalt manganate or lithium nickel cobalt aluminate battery positive electrode materials; and, the manganous salt is at least one of manganous sulfate, manganous chloride, manganous nitrate, manganous phosphate, manganous acetate, manganous oxalate, or manganous acetylacetonates; S 2 : calcining the ball milled mixed material to obtain a calcined product; and S 3 : adding the calcined product into a leaching agent for leaching to obtain a lithium-rich leaching solution; wherein the leaching agent is at least one of water, carbonic acid solution, sulfuric acid solution, hydrochloric acid solution, or sodium hydroxide solution.

2 . (canceled)

3 . The method according to claim 1 , wherein in step S 1 , the solvent is at least one of water, hydrochloric acid solution, sulfuric acid solution, manganese nitrate solution, or manganese sulfate solution.

4 . The method according to claim 1 , wherein in step S 1 , a solid-to-liquid ratio of the slurry is 500 g/L to 5000 g/L.

5 . (canceled)

6 . The method according to claim 1 , wherein in step S 1 , a molar ratio of manganese ions in the manganous salt to lithium ions in the positive electrode material is (0.1-2):1.

7 . The method according to claim 1 , wherein in step S 1 , a ball-to-material ratio of the ball milling is (1-100):1, a rotation speed of the ball milling is 200 rpm to 1200 rpm, and a time for the ball milling is 0.5 h to 8 h.

8 . The method according to claim 1 , wherein in step S 2 , a temperature of the calcining is 200° C. to 800° C., a heating rate is 1° C./min to 20° C./min, and a time for the calcining is 1 h to 12 h.

9 . (canceled)

10 . Use of the method according to 1 in a preparation of a lithium salt.

Assignees

• Guangdong Brunp Recycling Technology Co Ltd
• Hunan Brunp Recycling Tech Co Ltd
• Hunan Brunp Ev Recycling Co Ltd

Inventors

• Li Bo
• Li Changdong
• Ruan Dingshan
• Chen Ruokui
• Qiao Yanchao
• Bao Donglian

Classifications

• Y02W30/84

  Recycling of batteries or fuel cells · CPC title

• Y02P10/20

  Recycling · CPC title

• H01M10/54 Primary

  Reclaiming serviceable parts of waste accumulators · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• C22B1/02 Primary

  Roasting processes (C22B1/16 takes precedence) · CPC title