Secondary battery, battery module, battery pack, and electrical device

Patent metadata

Field	Value
Publication number	US-2025132322-A1
Application number	US-202419001005-A
Country	US
Kind code	A1
Filing date	Dec 24, 2024
Priority date	Jun 27, 2022
Publication date	Apr 24, 2025
Grant date	—

Abstract

A secondary battery is described. The secondary battery includes a positive electrode plate, a negative electrode plate, and an electrolyte solution. The positive electrode plate includes a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector. The positive electrode film layer includes a positive active material. The positive active material includes: S1) a lithium-containing compound of an olivine structure, and S2) a vanadium oxide represented by a general formula j(M2O) ·kVOx, where M is one or more of alkali metals, 0≤j≤1, 1≤k≤5, 1≤x≤2.5, a difference of a discharge platform voltage between S1 and S2 is E, and 0.2 V≤E≤2.8 V.

First claim

What is claimed is:

1 . A secondary battery, comprising a positive electrode plate, a negative electrode plate, and an electrolyte solution, wherein the positive electrode plate comprises a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector, the positive electrode film layer comprises a positive active material, and the positive active material comprises: S1 that is a lithium-containing compound of an olivine structure, and S2 that is a vanadium oxide represented by a general formula j(M 2 O)·kVO x , wherein M is one or more of alkali metals, 0≤j≤1, 1≤k≤5, 1≤x≤2.5, a difference of a discharge platform voltage between S1 and S2 is E, and 0.2 V≤E≤2.8 V.

2 . The secondary battery according to claim 1 , wherein M is one or both of Li and Na, and optionally M is Li, 0≤j/k≤1, and preferably 0.2≤j/k≤0.6.

3 . The secondary battery according to claim 1 , wherein S1 is a compound represented by a general formula LiA 1-n×y/2 M y PO4, wherein 0≤y≤0.1, wherein
A is at least one selected from Fe, Co, Ni, Cu, Mn, or Zn,
n is a valence state of the metal M, and n=+2, +3, +4, or +5;
M is at least one selected from Cr, Pb, Ca, Sr, Ti, Mg, V, Nb, or Zr; and
A is identical to or different from M.

4 . The secondary battery claim 1 , wherein S1 is optionally a compound of LiFe 1-n×y/2 M y PO 4 , wherein 0≤y≤0.1,
n is a valence state of the metal M, and n=+2, +3, +4, or +5;
M is at least one selected from Cr, Pb, Ca, Sr, Ti, Mg, V, Nb, or Zr; and
S2 comprises: LiVO 3 , Li 3 V 2 O 5 , Li 4 V 3 O 8 , LiV 3 O 8 , Li 2 VO 3 , LiVO 2 ; V 2 O 5 , V 2 O 3 , V 3 O 4 ;
and corresponding Na dopants of such constituents Li 0.95 Na 0.05 VO 3 , Li 2.95 Na 0.05 V 2 O 5 , and Li 3.95 Na 0.05 V 3 O 8 .

5 . The secondary battery according to claim 1 , wherein a mass percent of vanadium is 1 wt % to 5 wt %, based on a mass of the positive active material; and, in the positive active material, a molar ratio of vanadium to lithium is 1:(5 to 20), and preferably 1:(6 to 10).

6 . The secondary battery according to claim 1 , wherein a mass ratio of the constituent S1 to the constituent S2 is (3 to 20):1, and preferably (4 to 10):1.

7 . The secondary battery according to claim 1 , wherein a discharge platform voltage of the constituent S1 is 3.1 V to 4.8 V, and a discharge platform voltage of the constituent S2 is 1.0 V to 3.0 V.

8 . The secondary battery according to claim 1 , wherein the constituent S2 is coated with carbon or a conductive polymer.

9 . A battery module, comprising the secondary battery according to claim 1 .

10 . A battery pack, comprising the battery module according to claim 9 .

11 . An electrical device, comprising at least one of the secondary battery according to claim 1 .

12 . An electrical device, comprising at least one of the battery module according to claim 9 .

13 . An electrical device, comprising the battery pack according to claim 10 .

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Bie Changfeng
• Zhu Chang
• Liu Hongyu
• Dong Miaomiao
• Ouyang Shaocong
• Ni Huan

Classifications

• H01M4/52

  of nickel, cobalt or iron · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/5825 Primary

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M50/204

  Racks, modules or packs for multiple batteries or multiple cells · CPC title

• H01M2004/028

  Positive electrodes · CPC title