CN-121983509-A - Negative plate and battery

Abstract

The invention discloses a negative plate and a battery, and relates to the technical field of battery preparation. The negative electrode plate specifically comprises a negative electrode material, wherein the negative electrode plate comprises a negative electrode material, the negative electrode material comprises a MOF derivative material, the mass ratio of the MOF derivative material in the negative electrode material is 1% -5%, and the specific surface area of the MOF derivative material is 200.0m 2/g-1500.0 m2/g. According to the invention, the MOF derivative material is introduced into the anode material, so that the problems of limited capacity, slow ion migration, large volume change and the like of the existing graphite anode can be solved.

Inventors

• XU XIAOHU
• BIAN YING
• WANG CONG

Assignees

• 浙江吉利控股集团有限公司
• 浙江吉曜通行能源科技有限公司
• 湖州耀宁固态电池研究院有限公司

Dates

Publication Date

20260505

Application Date

20251225

Claims (10)

1. 1. A negative electrode sheet, characterized in that the negative electrode sheet comprises a negative electrode material, the negative electrode material comprises a MOF derivative material, the mass ratio of the MOF derivative material in the negative electrode material is 1% -5%, and the specific surface area of the MOF derivative material is 200.0m 2/g-1500.0 m2/g.
2. 2. The negative electrode sheet of claim 1, wherein the MOF-derived material is obtained by pyrolysis of a MOF precursor comprising metal ions and organic ligands.
3. 3. The negative electrode sheet according to claim 2, wherein the metal ion is one selected from the group consisting of transition metal ion, lanthanoid ion, actinoid ion.
4. 4. The negative electrode sheet of claim 3, wherein the transition metal ions are selected from one or more of Cr, mn, fe, co, ni, cu, zn, ag, mo, cd, au, hg, V, ti, sc.
5. 5. The negative electrode sheet according to claim 2, wherein the organic ligand is one selected from a group consisting of a C, H, O-only ligand and a heteroatom-containing ligand.
6. 6. The negative electrode sheet according to claim 5, wherein the ligand containing only C, H, O elements is selected from one of a carboxylic acid group and a benzene ring, and the ligand containing a hetero atom is selected from one of 2-methylimidazole and an amino group.
7. 7. The negative electrode sheet according to claim 2, wherein the pyrolysis is performed under an inert atmosphere, the temperature of the pyrolysis is 350-800 ℃, the pyrolysis time is 1-4 hours, and the temperature rising rate is 2-5 ℃ per minute.
8. 8. The negative electrode sheet according to claim 1, wherein the negative electrode material further comprises a carbon negative electrode material, and the sum of the mass ratio of the carbon negative electrode material and the MOF-derived material in the negative electrode material is 96%.
9. 9. The negative electrode sheet of claim 8, wherein the carbon negative electrode material comprises one or more of graphite, hard carbon, and soft carbon.
10. 10. A battery comprising a positive electrode sheet, a separator, an electrolyte, and the negative electrode sheet according to any one of claims 1 to 9.

Description

Negative plate and battery Technical Field The invention relates to the field of battery preparation, in particular to a negative plate and a battery. Background The lithium ion battery consists of a positive plate, a negative plate, a diaphragm and electrolyte. The negative electrode material is a constraint factor for determining the quick charge capacity of the lithium ion battery, and the gram capacity of the negative electrode material plays an important role in the energy density of the lithium ion battery. Currently, the negative electrode materials on the market are mainly graphite materials, wherein artificial graphite is mainly used. Graphite has the characteristics of excellent chemical stability and thermal stability, high lithium ion diffusion coefficient, high electron conductivity, low cost and the like, but the gram capacity of the graphite almost reaches the limit (372 mAh/g of theoretical gram capacity), the interlayer spacing of a graphite layered structure is smaller, the diffusion of lithium ions is blocked, the quick charging path of the lithium ions can be prolonged, the lithium precipitation risk exists during high-current charging, and great potential safety hazards are brought to an electric cell and a battery system. Therefore, optimization of conventional graphite to meet higher energy density and fast charge performance requirements is urgent. Disclosure of Invention In order to solve the problems, the invention provides a negative plate and a battery, which can solve the problems of limited capacity, slow ion migration, large volume change and the like of the existing graphite negative electrode by introducing MOF (Metal organic Framework) derivative materials into the negative electrode material, and meet the requirements of higher energy density and quick charge performance. The negative electrode plate provided by the invention comprises a negative electrode material, wherein the negative electrode material comprises an MOF derivative material, the mass ratio of the MOF derivative material in the negative electrode material is 1% -5%, and the specific surface area of the MOF derivative material is 200.0m 2/g-1500.0 m2/g. In one embodiment of the invention, the MOF-derived material is obtained by pyrolysis of a MOF precursor comprising metal ions and an organic ligand. In one embodiment of the invention, the metal ion is selected from one of a transition metal ion, a lanthanide ion, an actinide ion. In one embodiment of the invention, the transition metal ion is selected from one or more of Cr, mn, fe, co, ni, cu, zn, ag, mo, cd, au, hg, V, ti, sc. In one embodiment of the present invention, the organic ligand is selected from one of a C, H, O-element-only ligand and a heteroatom-containing ligand. In one embodiment of the present invention, the ligand containing C, H, O elements is selected from one of carboxylic acid group and benzene ring, and the ligand containing hetero atom is selected from one of 2-methylimidazole and amino group. In one embodiment of the invention, the pyrolysis is carried out under an inert atmosphere, the temperature of the pyrolysis is 350-800 ℃, the pyrolysis time is 1-4h, and the temperature rising rate is 2-5 ℃ per minute. In one embodiment of the invention, the anode material further comprises a carbon anode material, the sum of the mass fractions of the carbon anode material and the MOF derivative material in the anode material being 96%. In one embodiment of the invention, the carbon negative electrode material comprises one or more of graphite, hard carbon, soft carbon. The invention also provides a battery, which comprises a positive plate, a diaphragm, electrolyte and the negative plate. The invention also provides a vehicle, and the battery is mounted on the vehicle. Compared with the prior art, the invention has the following beneficial technical effects: The negative electrode plate and the battery provided by the invention optimize the negative electrode material which plays a limiting factor, and are mainly characterized in that a certain amount of MOF derivative material is added into the negative electrode material, so that the negative electrode plate has high specific capacity, can serve as a main material for playing roles in gram capacity, and improves the energy density of the battery, and the unique pore channel structure, the large specific surface area and the excellent conductivity are adopted to accelerate the rapid migration of lithium ions in the material, improve the electronic conductivity, improve the quick charge performance of the battery and avoid the safety risk caused by the lithium precipitation problem. Meanwhile, the porosity of the MOF derivative material can relieve the expansion and contraction of the material caused by the lithium ion intercalation and deintercalation process, the appearance is shown as reducing the expansion force of the battery, improving the performance of the battery and simultaneously