Positive electrode composite material for lithium-ion secondary battery and lithium-ion secondary battery
A positive electrode composite material for a lithium-ion secondary battery is provided. In some embodiments, the positive electrode composite material for a lithium-ion secondary battery comprises: a positive electrode active material selected from at least one of a lithium iron phosphate material and a nickel cobalt lithium manganate material; and at least one of compounds represented by A a M b (PO 4 ) c X d , wherein A is selected from at least one of Li, Na, K, and Ca, M is selected from at least one of V and Mn, X is selected from any one of halogen elements, a, b, and c are each independently selected from an integer from 1 to 6, and d is selected from an integer from 0 to 3.
1 . A positive electrode composite material for a lithium-ion secondary battery, wherein the positive electrode composite material comprises:
a positive electrode active material selected from at least one of a lithium iron phosphate material and a nickel cobalt lithium manganate material; and
at least one compound represented by A a M b (PO 4 ) c X d ,
wherein A is selected from at least one of Li, Na, K, and Ca, M is selected from at least one of V and Mn, X is selected from any one of halogen elements, a, b, and c are each independently selected from an integer of 1-6, and d is selected from an integer of 0-3,
wherein the at least one compound represented by A a M b (PO 4 ) c X d comprises CaV 4 (PO 4 ) 6 .
2 . The positive electrode composite material according to claim 1 , wherein when a discharge rate of the lithium-ion secondary battery is 0.33 C, the positive electrode composite material has a reversible charge-discharge plateau in a voltage range of below 3.0 V.
3 . The positive electrode composite material according to claim 1 , wherein a content of the at least one compound represented by A a M b (PO 4 ) c X d is from 3 wt % to 10 wt % relative to a total of 100 wt % of the positive electrode active material and the compounds represented by A a M b (PO 4 ) c X d .
4 . The positive electrode composite material according to claim 1 , wherein the lithium iron phosphate material is selected from at least one of LiFePO 4 , doped LiFePO 4 , LiFePO 4 coated with carbon, or doped LiFePO 4 coated with carbon.
5 . The positive electrode composite material according to claim 1 , wherein the nickel cobalt lithium manganate material is LiNi m Co n Mn 1-m-n O 2 , wherein 0.3≤m≤0.9, and 0≤n≤0.3.
6 . A positive electrode of a lithium-ion secondary battery, wherein the positive electrode comprises:
a positive electrode current collector and a positive electrode membrane comprising a positive electrode composite material disposed on at least one surface of the positive electrode current collector, the positive electrode composite material being the positive electrode composite material according to claim 1 .
7 . A lithium-ion secondary battery, comprising the positive electrode of the lithium-ion secondary battery according to claim 6 .
8 . A battery module, comprising the lithium-ion secondary battery according to claim 7 .
9 . A battery pack, comprising the battery module according to claim 8 .
10 . An electrical apparatus, comprising at least one of the lithium-ion secondary battery according to claim 7 .
11 . The positive electrode composite material according to claim 1 , wherein the at least one compound represented by A a M b (PO 4 ) c X d further comprises at least one of K 3 V 2 (PO 4 ) 3 , Na 3 V(PO 4 ) 2 , and K 3 V(PO 4 ) 2 .
12 . The positive electrode composite material according to claim 1 , wherein the at least one compound represented by A a M b (PO 4 ) c X d further comprises at least one of NaVPO 4 F, and KVPO 4 F.
13 . A positive electrode composite material for a lithium-ion secondary battery, wherein the positive electrode composite material comprises:
a positive electrode active material comprising a lithium iron phosphate material selected from at least one of LiFePO 4 , doped LiFePO 4 , LiFePO 4 coated with carbon, and doped LiFePO 4 coated with carbon; and
at least one compound comprises CaV 4 (PO 4 ) 6 ,
wherein a content of the at least one compound is from 3 wt % to 10 wt % relative to a total of 100 wt % of the positive electrode active material and the at least one compound.
14 . The positive electrode composite material according to claim 13 , wherein the positive electrode active material further comprises a nickel cobalt lithium manganate material, the nickel cobalt lithium manganate material is LiNi m Co n Mn 1-m-n O 2 , wherein 0.3≤m≤0.9, and 0≤n≤0.3.
15 . The positive electrode composite material according to claim 14 , wherein the nickel cobalt lithium manganate material is LiNi 0.65 Co 0.07 Mn 0.37 O 2 .
16 . A positive electrode composite material for a lithium-ion secondary battery, wherein the positive electrode composite material comprises:
a positive electrode active material comprising a nickel cobalt lithium manganate material, the nickel cobalt lithium manganate material is LiNi m Co n Mn 1-m-n O 2 , wherein 0.3≤m≤0.9, and 0≤n≤0.3; and
at least one compound comprises CaV 4 (PO 4 ) 6 ,
wherein a content of the at least one compound is from 5 wt % to 10 wt % relative to a total of 100 wt % of the positive electrode active material and the at least one compound.
17 . The positive electrode composite material according to claim 16 , wherein the positive electrode active material further comprises a lithium iron phosphate material selected from at least one of LiFePO 4 , doped LiFePO 4 , LiFePO 4 coated with carbon, and doped LiFePO 4 coated with carbon.
18 . The positive electrode composite material according to claim 17 , wherein the nickel cobalt lithium manganate material is LiNi 0.65 Co 0.07 Mn 0.37 O 2 , the positive electrode active material further is LiFePO 4 .