Lithium-ion battery and battery module, battery pack, and electric apparatus containing same
A lithium-ion battery and a battery module, a battery pack, and an electric apparatus containing the same are provided. The lithium-ion battery includes a positive electrode active material layer including a positive electrode active material and a pre-lithiation agent and an electrolyte including an additive, where the pre-lithiation agent is a lithium metal oxide pre-lithiation agent, the additive includes at least one of compound 1 shown in constitutional formula (I) and compound 2 shown in constitutional formula (II) below. In the following constitutional formula (I), R 1 is an oxygen atom or methylene, and R 2 is a hydrogen atom, a halogen atom, an alkyl group having 1 to 3 carbon atoms, a halogenated alkyl group having 1 to 3 carbon atoms.
1 . A lithium-ion battery, wherein the lithium-ion battery comprises a positive electrode active material layer and an electrolyte, wherein
the positive electrode active material layer comprises a positive electrode active material and a pre-lithiation agent, and the pre-lithiation agent is a lithium metal oxide pre-lithiation agent comprising one or more of Li 6 CoO 4 , Li 5 FeO 4 , Li 3 VO 4 , Li 2 MoO 3 , Li 2 RuO 3 , Li 2 MnO 2 ,
the electrolyte comprises an additive, and
the additive comprises at least one of compound 1 shown in constitutional formula (I) and compound 2 shown in constitutional formula (II), wherein
in the constitutional formula (I), R 1 is an oxygen atom or methylene, and R 2 is a hydrogen atom, a halogen atom, an alkyl group having 1 to 3 carbon atoms, a halogenated alkyl group having 1 to 3 carbon atoms, or an alkoxy group having 1 to 3 carbon atoms, and
in the constitutional formula (II), R 31 , R 32 , R 33 , and R 34 are each independently selected from a single bond or methylene, and R 4 is
wherein R 5 is an alkylidene group having 1 to 3 carbon atoms, a halogenated alkylidene group having 1 to 3 carbon atoms, or an alkyleneoxy group having 1 to 3 carbon atoms,
wherein during the charging of the battery cell, the at least one of compound 1 shown in constitutional formula (I) and compound 2 shown in constitutional formula (II) in the electrolyte of the lithium-ion battery forms a film on the pre-lithiation agent and/or the pre-lithiation agent with lithium released, after the film is formed, a molar ratio C of element sulfur(S) contained in a positive electrode plate to a sum of the pre-lithiation agent and the pre-lithiation agent with lithium released satisfies 0.01≤C≤1.
2 . The lithium-ion battery according to claim 1 , wherein the pre-lithiation agent comprises one or more of Li 3 VO 4 , Li 2 MoO 3 , Li 2 MnO 2 .
3 . The lithium-ion battery according to claim 1 , wherein a mass percentage W1 of the pre-lithiation agent in the positive electrode active material layer satisfies 0.1%≤W1≤10%.
4 . The lithium-ion battery according to claim 3 , wherein the mass percentage W1 satisfies 0.5%≤W1≤8%.
5 . The lithium-ion battery according to claim 1 , wherein a median particle size by volume D v 50 of the pre-lithiation agent is 0.1 μm-30 μm, and a median particle size by volume D v 50 of the positive electrode active material is 0.1 μm-10 μm.
6 . The lithium-ion battery according to claim 1 , wherein a ratio A of the median particle size by volume D v 50 of the pre-lithiation agent to the median particle size by volume D v 50 of the positive electrode active material satisfies 1≤A≤10.
7 . The lithium-ion battery according to claim 6 , wherein the ratio A satisfies 2≤A≤8.
8 . The lithium-ion battery according to claim 1 , wherein in the constitutional formula (II), R 4 is
where R 5 is an alkylidene group having 1 to 3 carbon atoms or an alkyleneoxy group having 1 to 3 carbon atoms.
9 . The lithium-ion battery according to claim 1 , wherein the compound 1 comprises one or more of the following compounds:
and
the compound 2 comprises one or more of the following compounds:
10 . The lithium-ion battery according to claim 1 , wherein a mass percentage W2 of the compound 1 and the compound 2 in the electrolyte satisfies 0.01%≤W2≤ 20%.
11 . The lithium-ion battery according to claim 10 , wherein the mass percentage W2 satisfies 0.1%≤W2≤10%.
12 . The lithium-ion battery according to claim 1 , wherein a molar ratio B of a sum of the compound 1 and the compound 2 to the pre-lithiation agent satisfies 0.01≤B≤2.3.
13 . The lithium-ion battery according to claim 1 , wherein the additive comprises the compound 2 shown in constitutional formula (II).
14 . The lithium-ion battery according to claim 13 , wherein the compound 2 comprises one or more of the following compounds:
15 . A battery module, comprising the lithium-ion battery according to claim 1 .
16 . A battery pack, comprising the battery module according to claim 15 .
17 . An electric apparatus, comprising at least one of the lithium-ion battery according to claim 1 , the battery module according to claim 15 , or the battery pack according to claim 13 .