Performance evaluation of thermochemical energy storage system based on lithium orthosilicate and zeolite

Lithium compounds for thermochemical energy storage: A state-of-the-art review and future trends

“…The composites incorporate materials that form a matrix to contain the salt and enhance cycle stability, thermal conductivity, and promote the heat and mass transfer. For instance, common composites using lithium salts are; activated carbon (AC) mixed with expanded natural graphite treated with sulfuric acid (ENG-TSA) [69,70], expanded graphite (EG) [71][72][73], activated alumina (AA) [74], expanded vermiculite (EVM) [75], Wakkanai siliceous shale (WSS) [76], silica gel (SG) [77], vermiculite (VM) [78][79][80], silica-alumina (S-AA) [81], zeolite (13X-Z, NaY-Z, Z) [82][83][84][85], graphene oxide (GO) [86]. In this sense Yu et al [69,70] developed a new type of consolidated composite sorbent using activated carbon (AC) as the porous matrix to harbour the LiCl salt.…”

“…In an attempt to further characterise the effectiveness of Li4SiO4/CO2/zeolite as a TCS system, Takasu et al [84] and Kim et al [85] tested the same Li4SiO4/CO2/zeolite TCS system for high temperature performance. Takasu et al's [84] results indicated that carbonation of Li4SiO4 was completed after 5 min, while decarbonation was completed after 150 min under isothermal experiments. In this case, the maximum wout and win rates of Li4SiO4 with 59% of porosity, were 7.2 kW/kg and 1.9 kW/kg, respectively.…”

Li4SiO4-Based Heat Carrier Derived from Different Silica Sources for Thermochemical Energy Storage

“…When thermal energy is demanded, the Li4SiO4 and CO2 are transported to the heat-releasing reactor to regenerate Li2SiO3 and Li2CO3 by releasing heat, thus forming the cyclic heat storage-releasing processes. The comprehensive performance of a Li4SiO4 heat carrier, mainly including the heat storage/releasing capacity and the cyclic stability, directly determines the operation efficiency and operation life of Li4SiO4-CO2 TCES systems [26,27]. Hence, various approaches have been reported to improve the performance of Li4SiO4.…”

“…The optimization of synthetic processes could also improve the performance of the obtained Li4SiO4, especially the selection of raw materials. Traditionally, the Li4SiO4 heat carrier was synthesized using Li2CO3 and SiO2 as the Li source and Si source, and the as-synthesized sample shows a relatively poor heat storage capacity of 470-600 kJ/kg within 20 cycles, which only reaches 60-77% of the theoretical value of The comprehensive performance of a Li 4 SiO 4 heat carrier, mainly including the heat storage/releasing capacity and the cyclic stability, directly determines the operation efficiency and operation life of Li 4 SiO 4 -CO 2 TCES systems [26,27]. Hence, various approaches have been reported to improve the performance of Li 4 SiO 4 .…”