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Preparation method of silver phosphide-carbon material composite and solid-state lithium-ion battery containing it

A lithium-ion battery, carbon material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as depletion of electrolyte and volume change, and achieve the effects of long service life, high capacity, and good cycle performance

Active Publication Date: 2022-06-07
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium intercalation and deintercalation during charge-discharge cycles 3 P, the repeated rupture and regeneration of the solid electrolyte interfacial phase will produce a huge volume change and eventually deplete the electrolyte

Method used

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  • Preparation method of silver phosphide-carbon material composite and solid-state lithium-ion battery containing it
  • Preparation method of silver phosphide-carbon material composite and solid-state lithium-ion battery containing it
  • Preparation method of silver phosphide-carbon material composite and solid-state lithium-ion battery containing it

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preparation example Construction

[0035] In one embodiment of the method for preparing a silver phosphide-carbon material composite according to the present invention, the mass ratio of the silver powder to the carbon powder is 2:1 to 10:1, and the phosphating agent and the silver / The mass ratio of the carbon mixture is 3:1~10:1.

[0036] In one embodiment of the method for preparing a silver phosphide-carbon material composite according to the present invention, the particle size of silver is in the range of D50≤200nm, preferably D50≤60nm; the particle size of carbon is in the range of D50≤100nm, preferably D50≤35nm.

[0037] Considering the rapidity of the reaction and the uniformity of the reaction, the smaller the particle size of silver and carbon, the better, because it can not only shorten the reaction time, but also make the mixing of silver and carbon more fully, thereby improving the cycle performance of the battery. .

[0038] In another embodiment of the method for preparing a silver phosphide-c...

Embodiment 1

[0055]

[0056] Weigh 2.0 g of silver powder and carbon black in a mass ratio of 1:1, stir with a stainless steel rod for 5 min to obtain a silver-carbon mixture, and place it in a porcelain boat. 0.83g of red phosphorus and 0.625g of solid potassium hydroxide were weighed and placed in another porcelain boat according to the ratio of silver-carbon mixture to red phosphorus mass ratio of 1.67:1. Put two porcelain boats into the tube furnace, the latter is placed at the upper tuyere and the former is placed at the lower tuyere. Argon gas was introduced into the tube furnace as a protective atmosphere, the tube furnace was heated to 350 °C at a rate of 2 °C / min, kept at this temperature for 4 h, and then cooled to room temperature by program to obtain a silver phosphide / carbon composite Ag 1.2 P-C, the chemical formula of the silver phosphide is determined by energy spectrum analysis as Ag 1.2 P.

[0057]

[0058] The silver phosphide / carbon composite prepared above, Ketj...

Embodiment 2

[0066] A total of 4 g of silver powder and graphene were weighed in a mass ratio of 3:1, stirred with a stainless steel rod for 5 min to obtain a silver-carbon mixture, and the silver-carbon mixture was placed on the plane of the porcelain boat. Weigh 0.30g of red phosphorus and 0.225g of solid potassium hydroxide according to the ratio of silver-carbon mixture to red phosphorus mass ratio of 13.3:1 and place them on another porcelain boat plane. Put two porcelain boats into the tube furnace at the same time, place the porcelain boat with ammonium hydrogen phosphate at the upper tuyere, and place the porcelain boat with the silver-carbon mixture at the lower tuyere. An argon protective atmosphere was introduced into the tube furnace, and the tube furnace was heated to 650 °C at a rate of 5 °C / min, kept at this temperature for 2 h, and then cooled to room temperature by a program to obtain silver phosphide / carbon composite Ag. 10 P-C. The chemical formula of the silver phosphi...

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Abstract

Disclosed are a solid-state lithium ion battery comprising a silver phosphide-carbon material composite and a preparation method for the composite. The solid-state lithium ion battery comprises a positive pole, a negative pole and an electrolyte, wherein the negative pole active material layer contains Ag x P-C, the electrolyte is a sulfide solid electrolyte. The preparation method includes (1) mixing silver powder and carbon material at a mass ratio of 0.5:1 to 20:1 to obtain a silver / carbon mixture; (2) in a tube furnace, the mass ratio of the phosphating agent to the silver / carbon mixture is 0.5:1~15:1, the phosphating agent is placed in the second porcelain boat at the upwind port, and the silver / carbon mixture is placed in the first porcelain boat at the downwind port. After reacting and cooling, a silver phosphide-carbon material composite is obtained. Due to the inclusion of the complex, the interface between the negative electrode and the solid electrolyte forms Li 3 P, improves the interface ionic conductivity, and the carbon particles are Li 3 The volume change of P in the intercalation-delithiation process provides accommodation space, so as to obtain a more stable negative electrode, so the cycle performance, rate performance and service life of the battery can be improved.

Description

technical field [0001] The present invention relates to the field of lithium batteries, and more particularly, to a method for preparing silver phosphide-carbon material composite Ag x The method of P-C (where x=1-15), and the solid-state lithium ion battery comprising the silver phosphide-carbon material composite in the negative electrode active material layer and the electrolyte being a sulfide solid electrolyte. Background technique [0002] Traditional lithium-ion batteries use liquid electrolytes containing flammable organic solvents, which have potential safety hazards such as heat generation and explosion. The development of all-solid-state lithium-ion batteries is one of the feasible technical approaches to improve battery safety. In the all-solid-state lithium-ion battery, the solid-solid phase contact is between the electrode and the solid electrolyte. Compared with the solid-liquid phase contact between the electrode and the liquid electrolyte, the interfacial c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/0525H01M10/0562
CPCY02P70/50
Inventor 蒋茹齐浩军彭祖铃
Owner CALB CO LTD
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