Lithium battery negative electrode and lithium battery

A lithium battery and negative electrode technology, applied in the field of lithium battery negative electrode and lithium battery, can solve problems such as hidden dangers of battery safety performance, low theoretical capacity of graphite negative electrode, battery capacity attenuation, etc., so as to improve safety performance and cycle performance, and improve lithophilicity. , the effect of avoided losses

Pending Publication Date: 2021-12-24
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the theoretical capacity of existing graphite negative electrodes is low, which cannot meet the requirements of high energy density batteries.
The electrode potential of lithium metal is low, and it can increase the energy density of the battery when used as a negative electrode material. However, the chemical properties of lithium metal itself are relatively active, and as a negative electrode, lithium dendrites are easily generated during the charge-discharge cycle of the battery. The generation of lithium dendrites Not only will it cause the loss of active lithium, that is, the attenuation of battery capacity, but there will also be hidden dangers in battery safety performance.

Method used

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  • Lithium battery negative electrode and lithium battery

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Effect test

preparation example Construction

[0034] There is no mandatory requirement for the preparation method of the negative electrode of the lithium battery. The negative electrode of the lithium battery can be obtained by coating the protective layer slurry on the surface of the negative electrode current collector; it can also be coated with the negative electrode active material slurry and the protective layer slurry on the surface of the negative electrode current collector in sequence. Material, obtain lithium battery negative electrode.

[0035] Wherein, the preparation of protective layer slurry comprises the following steps:

[0036] (1) Dissolving the cobalt source, nitrogen source, and transition metal source in a solvent, stirring to react to obtain a reaction liquid;

[0037] (2) After treating the carbon source in acid, add it to the reaction solution in step (1), stir and evaporate to obtain a black powder;

[0038] (3) Calcining the black powder obtained in step (2) at high temperature under an inert...

Embodiment 1

[0049] (1) Mix 0.75ml of aniline, 218g of Co(NO 3 ) 2 ﹒ 6H 2 O, 1.25g (NH 4 ) 2 S 2 o 8 Add to 125ml of 1M hydrochloric acid solution, stir and react to obtain a reaction solution;

[0050] (2) Pretreat 0.1g of carbon black in 70% nitric acid and disperse it in 10ml of 1M hydrochloric acid solution, then add it to the reaction solution obtained in step (1), stir for 48 hours, and then Stir and evaporate the solution on a heating plate at ℃ to obtain a black powder, which is ground with a mortar;

[0051] (3) The powder obtained in step (2) was calcined and carbonized in a tube furnace at a high temperature of 800°C for one hour under an argon atmosphere, and the calcined powder was heated in 0.5M H 2 SO 4 Pickling in the solution at 80-90°C for 8 hours, and then drying in a vacuum oven for 12 hours at 100°C. Then, after secondary calcination in a tube furnace, a composite material is obtained. The composite material is a graphene matrix co-doped with cobalt and nitr...

Embodiment 2

[0054] The difference from Example 1 is that the high-temperature calcination temperature in step (3) is 750°C; the obtained composite material is a graphene matrix co-doped with cobalt and nitrogen elements and a Co 9 S 8 Particles, wherein, in the graphene matrix, the mass content of cobalt element is 10%, the mass content of nitrogen element is 12%, in the composite material, the mass proportion of graphene matrix is ​​90%, Co 9 S 8 The mass proportion of particles is 10%, and the Co 9 S 8 The particle diameter of the particles was 17 nm.

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Abstract

The lithium battery negative electrode comprises a negative electrode current collector and a protective layer arranged on the surface of the negative electrode current collector, the protective layer comprises a doped carbon material matrix and transition metal compound particles, and at least part of the transition metal compound particles are coated by the doped carbon material matrix, doping elements in the doped carbon material matrix are cobalt element and nitrogen element. The arrangement of the protective layer is beneficial to uniform deposition of lithium ions in the negative electrode, so that lithium dendrites can be effectively prevented from growing towards the positive electrode side, and the phenomenon of short circuit of the battery is avoided.

Description

technical field [0001] The present application relates to the field of lithium batteries, in particular to a lithium battery negative electrode and a lithium battery. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products such as digital cameras, mobile phones and notebook computers, as well as electric bicycles and electric vehicles due to their high reversible capacity, high energy density, long cycle life, and environmental protection. With the popularity of new energy vehicles, the requirements for batteries are getting higher and higher. In order to meet the needs of longer mileage, people are committed to the research of high energy density lithium batteries. However, the theoretical capacity of existing graphite negative electrodes is low, which cannot meet the requirements of high energy density batteries. The electrode potential of lithium metal is low, and it can increase the energy density of the battery when used as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M4/134H01M10/052H01M10/058
CPCH01M4/134H01M10/4235H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 张露露江文锋郭姿珠谢静
Owner BYD CO LTD
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