Si/C Composites as Negative Electrode for High Energy Lithium Ion Batteries

Abstract

Silicon is very promising negative electrode materials for improving the energy density of lithium‐ion batteries (LIBs) because of its high specific capacity, moderate potential, environmental friendliness, and low cost. However, the volume variation of Si negative electrodes is huge during lithiation/delithiation processes which results in pulverization, low cycling efficiency, and permanent capacity loss. In order to overcome this problem, tremendous efforts have been attempted. Among them the most successful strategy is to incorporate other components into silicon to form composite, especially the carbon medium. In this mini review, the recent progress on Si/C materials used as negative electrode of LIBs is summarized such as Si/amorphous carbon composite, Si/graphene composites, Si/carbon nanotubes or fibers composites. The fabrication, structure, electrochemical performances of different Si/C composites are discussed. In addition, some future directions are pointed out.

Electrochemical Performance of Structure‐Dependent LiNi1/3Co1/3Mn1/3O2 in Aqueous Rechargeable Lithium‐Ion Batteries

“…As a result, there is a growing need for efficient and clean energy. Because of their high power density and long cycle life, lithium‐ion batteries (LIBs) are widely used in electric vehicles (EVs) and energy‐storage systems (ESSs) . However, the flammability and toxicity of organic electrolytes used in LIBs limit their applications .…”

“…Due to economic developments,e nergy shortages and environmentalp ollution are becoming more serious.A saresult, there is ag rowingn eed for efficient and clean energy.B ecause of their high power density and long cycle life,l ithiumion batteries (LIBs) are widely used in electric vehicles (EVs) and energy-storage systems (ESSs). [1][2][3] However, the flammability and toxicity of organic electrolytes used in LIBs limit their applications. [4][5][6] Improved safety has become a great challenge with more attention on the safety of electronic equipment.…”

“…NCM microrods were synthesized by as olvothermal method. Ty pically,s toichiometric amounts of Ni(CH3 COO) 2 ·4H 2 O, Mn(CH 3 COO) 2 ·4H 2 O,Co(CH 3 COO) 2 ·4H 2 O, and Li(CH 3 COO) 2 ·4H 2 O( 5% excess) were dissolved in an aqueous solution of alcohol (100 mL;e thanol/water,1:1 v/v). Then as olution of H 2 C 2 O 4 (0.06 mol H 2 C 2 O 4 in 40 mL ethanol) was added dropwise.T he resulting solution was sealed in aT eflon autoclave and heated to 180 8Cf or 12 ha nd cooled to room temperature naturally.A fter the solvothermal reaction, the solution was heated to 80 8Ci na no ven to evaporate the solvent.…”

Progresses in Manufacturing Techniques of Lithium‐Ion Battery Separators in China

“…Since the first introduction of the rechargeable lithium‐ion batteries (LIBs) in 1991 by Sony, the LIBs with high energy density and long cycle life are rapidly becoming the preferred choice for electric vehicles (EVs), powering portable electronic devices and energy storage systems . Separator is one of the four key components in LIBs that prevents electronic contact between the positive and negative electrodes and allows rapid ionic transportation through its porous structure.…”

Catalytic Growth of Graphitic Carbon‐Coated Silicon as High‐Performance Anodes for Lithium Storage

“…Carbon materials have become potential negative electrode materials due to their small volume change, good cycle stability, and electrical conductivity, which make them good components to combine with silicon anode . Among various carbon materials, porous carbon has been considered an ideal candidate for reserving a space to accommodate the volume variation and beneficial to electrolyte infiltration for Li + transfer . The common method for preparing mesoporous carbon is prepreparing a template in advance and then etching it.…”