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Some methods of pre-lithiation

Source: Lithium Battery Alliance Chairman Author/Zhu Liang etc. In order to solve this problem, people have studied prelithiation technology. The electrode material is recharged with lithium through prelithiation to offset the irreversible lithium loss caused by the formation of the SEI film, so as to increase the total capacity and energy density of the battery. The common pre-lithiation method of anode lithium supplement technology is anode lithium supplement, such as lithium foil supplement lithium, lithium powder lithium supplement, etc., which are currently the key development pre-lithiation processes. Lithium foil Pre-lithiation with lithium foil is a technology that uses self-discharge mechanism to supplement lithium. The potential of metallic lithium is the lowest among all electrode materials. Due to the existence of the potential difference, when the anode material contacts the metallic lithium foil, electrons spontaneously move to the anode, accompanied by the intercalation of Li+ in the anode. The electrolyte is dropped on the silicon nanowire anode grown on the stainless steel substrate, and then it is directly contacted with the lithium metal foil to supplement lithium. A half-cell test was performed on the anode after replenishing lithium, and it was found that the open circuit voltage of unreplenished lithium was 1.55V, and the specific capacity of lithium intercalation for the first 0.1C discharge at 0.01~1.00V was 3800mAh/g; the silicon nanowires after replenishing lithium were open circuit The voltage is 0.25V, and the specific capacity for lithium insertion for the first time is 1600mAh/g. The tin-carbon anode is directly contacted with the lithium foil soaked in the electrolyte for 180 minutes to supplement lithium. With a half-cell test, the irreversible specific capacity of tin-carbon is reduced from 680mAh/g to 65mAh/g after replenishing lithium. The anode constitutes a full battery. The ICE tested at a rate of 1.0C at 3.1 to 4.8V is close to 100%, and the cycle is stable, and the rate performance is good. Although the anode can be pre-lithiated in direct contact with the lithium foil, the degree of pre-lithiation is not easy to accurately control. Insufficient lithiation cannot sufficiently improve ICE; and excessive pre-lithiation may form a metal lithium plating layer on the surface of the anode. Z. Y. Cao and others have improved the safety of pre-lithiation with lithium foil. The designed active material/polymer/lithium metal three-layer structure anode can be stable in ambient air for 30-60 minutes, which is sufficient for anode processing. The three-layer structure is: a metal lithium layer electrochemically deposited on a copper foil, the lithium layer is coated with a polymethyl methacrylate protective layer and an active material layer.  
2020-06-08
Pre-lithiation

Pre-lithiation drives demand for the lithium industry. Institutions expect the industry to grow at an annual rate of nearly 20%

According to the Shanghai Securities Journal, the new refinancing regulations were officially implemented in February this year. More than 10 lithium battery industry chain companies have disclosed a total of 40 billion yuan of fixed increase plans, of which nearly 26 billion yuan has been used Expansion of production capacity. According to industry insiders, the expansion of production by leading companies will promote the sound development of the lithium battery industry. A few days ago, the "Action Plan for Promoting the Development of the Automotive Power Battery Industry" issued by four ministries and commissions including the Ministry of Industry and Information Technology clearly stated that increased investment in the research and development of solid-state batteries and other new batteries. Judging from the R&D progress of various companies, Guoxuan Hi-Tech is already developing solid-state batteries and solid-state electrolytes. Ganfeng Lithium's solid-state lithium battery pilot production line was built in Xinyu, Jiangxi, and is currently progressing smoothly. Jiawei New Energy has taken solid-state lithium batteries as the company's main strategic development direction, and has released solid-state lithium battery related products. Yesterday, the lithium battery sector rose well, but the performance of the leading lithium industry continued to decline. Ganfeng Lithium announced that it expects a net profit of 7 million to 10 million yuan in the first quarter of 2020, a decrease of 96%-97% from the same period of the previous year; and Tianqi Lithium’s estimated net profit loss in the first quarter of 2020 is 450 million yuan – 510 million yuan, with a profit of 111 million yuan in the same period last year. Guotai Junan observed that China’s imports of lithium carbonate from Argentina and Chile increased by 97% from January to February, putting greater pressure on the overall excess supply and demand. In terms of prices, the global import and export prices of lithium carbonate and lithium hydroxide have declined to varying degrees. Combined with the cost curve of the lithium industry, Guotai Junan believes that the current lithium price is supported by the cost curve and there is little room for a drop. He believes that the epidemic will affect the pace of demand in the short term, and is still optimistic about the rapid development of long-term new energy vehicles, which will correspondingly drive the rapid growth of the lithium industry. It is predicted that the lithium industry will maintain a growth rate of 18%-20% in the next 5 years, and the growth will accelerate year by year. Everbright Securities believes that with the popularization and application of cathode materials such as NCM and NCA, and Tesla's tireless pursuit of cobalt-free, it has promoted the development of ultra-high nickel-based ternary materials, and the energy density of cathode materials has been greatly improved. However, the specific capacity of the existing graphite anode is close to the limit. In order to increase the overall energy density of lithium batteries, it is urgent to develop new lithium battery anode materials. 图源:光大证券 Almost all new anode materials have a shortcoming. SEI film is formed during the first charge and discharge process, which causes irreversible loss of active lithium, which further hinders their commercial application. Therefore, prelithiation technology came into being. The electrode material is recharged with lithium through prelithiation to offset the irreversible lithium loss caused by the formation of the SEI film, so as to increase the total capacity and energy density of the battery. 图源:光大证券 Silicon material is the negative electrode material with the highest specific volume. Through material recombination and pre-lithiation, Si/C is expected to become a new generation of ideal negative electrodes. Maxwell dry electrode production maintains a solvent-free dry state, which is very suitable for pre-lithiation and promotes the industrialization of Si/C. In the future, ultra-high nickel ternary materials + silicon carbon anode will become the mainstream direction, and pre-lithiation will increase the demand for lithium metal.
2020-06-08
Power

Power battery new battle: Tesla vs. CATL ?

Author: China Energy Storage Network News source: krypton 36 China Energy Storage Network News: The powerful enemy is new, and internal worries are looming. CATL has been quite troubled recently. On March 16, CATL’s share price plunged 9.87% to close at 119.06 yuan. According to media reports, CATL’s stock price plummeted this time due to a shareholding reduction plan last Friday. According to the announcement, Ningde Times shareholders Zhaoyin No. 3 and China Merchants Bank Power plan to reduce their holdings by no more than 44.168 million shares (not more than 2% of the company's total equity) through block transactions or centralized bidding. Since its listing, CATL has encountered shareholder reductions for the first time. What makes the CATL even more troublesome is that more and more car companies choose to build their own battery production lines, which means that the CATL not only faces the risk of customer loss, but also new opponents. On March 9, according to foreign media reports, Volvo officially started production at its electric car plant in Ghent, Belgium. It is understood that this will be Volvo's first factory with a professional battery assembly line. It is Tesla that deployed the battery business earlier than Volvo. According to a report on the electrek website, Tesla is building a pilot battery production line at the Fremont plant in the United States. Unlike its battery factory operating in Nevada, Tesla designed its own battery production equipment. "I hope to control my own destiny on the battery issue," said Drew Bagrino, Tesla's vice president of technology. Some analysts believe that Tesla will open the supply of battery products to other car companies after the battery capacity is sufficient to meet its own needs. If Tesla is re-examined as a battery manufacturer, this is still a powerful opponent worthy of vigilance. Today's partners Panasonic, CATL and LG Chem will have to "turn friends into enemies", and a new battle will be formed in the field of power batteries. Battery vendors launch alliance campaign There are not a few car companies like Tesla that build their own battery factories. General Motors will build a battery production base in the United States. Mercedes-Benz has 9 battery factories in Europe, Asia and North America. BYD has 5 battery factories in China, located in Huizhou, Shenzhen, Chongqing, Xi'an and Qinghai. Geely has two battery factories in Ningbo and Jinhua, and its battery factory in Jingzhou will be completed and put into production this year. If car companies can achieve "battery freedom", battery companies will face the risk of losing customers. Therefore, many battery manufacturers have taken precautions and launched an alliance campaign in advance. The Swedish battery company Northvolt and Volkswagen jointly established a battery factory. After LG Chem and General Motors jointly established a new energy vehicle battery joint venture, they joined hands with Hyundai. French battery manufacturer Saft and Peugeot Citroen Group (PSA) have jointly established two automotive power battery plants. Even Panasonic, who has fought side by side with Tesla for 10 years, is looking for a good partner. On February 3, 2020, Panasonic announced a partnership with Toyota Motor. The two parties will establish a joint venture battery company named "Taixing Energy Solutions Co., Ltd." in two months. The company is 51% owned by Toyota and 49% by Panasonic. In this cooperation, Panasonic has added a new battery pack technology route and will provide Toyota with car prismatic batteries. In an interview with Nikkei, a senior executive of Panasonic expressed the "mystery", "Panasonic is striving to build a TTP system." TTP refers to Tesla (Tesla), Toyota (Toyota), Panasonic (Panasonic) ). In the era of the global power battery giant Ningde, it has already set up the battle in advance through "alliance" with many car companies. So far, CATL has reached joint ventures or equity-level cooperation with the six state-owned automobile companies of FAW, BAIC, GAC, Dongfeng, SAIC, and Changan to jointly develop and produce power batteries. In addition, it also established a battery joint venture with Zhejiang Jirun, a subsidiary of Geely Automobile. According to incomplete statistics, there are already about 30 domestic and foreign auto companies "allied" with the CATL. CATL has become a representative in the camp of joint production of batteries with car companies.   Take fate in your own hands Colleagues have clung to the "thighs" of the CATL to reduce the cost of manufacturing electric vehicles. Tesla has taken a different approach and has been "conspiring" to build its own battery. Power batteries are the key components of electric vehicles. Localizing or even self-producing this ring will completely avoid the risk of production shutdown due to battery suppliers’ shortages. In addition, it will also significantly reduce the production costs of electric ve
2020-06-23
Academician

Academician Yang Yusheng of the Chinese Academy of Sciences visited CEL for guidance

Academician Yang Yusheng, an academician of the Chinese Academy of Engineering led a team of experts to visit and guide our company. The two sides conducted in-depth discussions on the application of lithium metal in batteries.
2020-06-23
Company

Company fire control and safety training

CEL attaches great importance to safety work and regularly conducts fire extinguishing training to improve employees' awareness of fire safety and enhance their ability to prevent and control fire in summer. China Energy Lithium co.ltd is a high-tech enterprise specializing in the production of environmentally friendly and green lithium battery electrode materials. Since its establishment, CEL has been committed to battery-grade metal lithium belts, lithium sheets, lithium ropes, high-purity metal lithium, passivated lithium powder, lithium aluminum alloy belts, lithium magnesium Research, development, production and sales of alloy strips, lithium aluminum alloy powder, lithium silicon alloy powder, lithium boron alloy profiles and related products.
2020-06-23
Comprehensive

Comprehensive emergency drill of China energy lithium

In order to enhance the awareness of safety and fire extinguishing, on May 16, 2018, CEL organized all staff to carry out emergency evacuation, put out lithium metal fire, and emergency transportation and transfer of important materials in dangerous goods warehouse.
2020-06-23
2018

2018 Shenzhen CIBF Exhibition

The 13th China International Battery Technology Exchange (CIBF) was held as scheduled at the Shenzhen Convention and Exhibition Center from May 21 to 24, 2018. Many people from our company attended the exhibition. During the exhibition, we have in-depth exchanges with various enterprises, experts and scholars. CEL is the solution provider and provider of the next generation  battery lithium metal, battery anode pre-lithiation.
2020-06-23
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