Due to higher theoretical specific capacity and lower electrochemical redox potential, lithium metal is considered an ideal anode material for high specific energy batteries. However, safety problems related to the uncontrolled growth of lithium dendrites and the volume expansion of lithium have hindered its commercialization. This paper reports a viscoelastic interface based on viscoelastic polymer (hydroxypropyl methyl cellulose) to protect lithium metal anode. The lithiophilic interface has good chemical, electrochemical and mechanical stability, which makes the dendrite-free and low volume expansion lithium possible. The Li/Li symmetrical battery based on anode protected by viscoelastic interface show better cycle stability and longer cycle life. The morphologies after cycles show a relatively smooth and dense lithium deposition. Li/LFP full battery test results show higher reversible capacity at higher C-rate, high capacity retention (85.2%) and stable coulomb efficiency (99.5%) at 0.2C after 200 cycles. This work provides insight into the strategy of interfacial engineering to protect lithium metal anode.

由于较高的理论比容量和较低的电化学氧化还原电位，锂金属被认为是高比能量电池的理想负极材料。然而，与锂树枝状晶体的不受控制的生长和锂的体积膨胀有关的安全问题阻碍了其商业化。本文报道了一种基于粘弹性聚合物（羟丙基甲基纤维素）的粘弹性界面来保护锂金属阳极。亲硫的界面具有良好的化学，电化学和机械稳定性，这使得无枝晶和低体积膨胀锂成为可能。基于阳极的锂/锂对称电池受粘弹性界面保护，具有更好的循环稳定性和更长的循环寿命。循环后的形态显示出相对平滑和致密的锂沉积。Li / LFP满电池测试结果表明，在200个循环后，在较高的C速率下具有较高的可逆容量，在0.2C时具有较高的容量保持率（85.2％）和稳定的库仑效率（99.5％）。这项工作为保护锂金属阳极的界面工程策略提供了见识。